Feb 27 2015

Valve maintenance of common problems in maintenance and matters needing attention

Daily valve maintenance

1, the valve should be kept dry and ventilated room, access to be blocked at both ends.

2, the long-term storage of the valve should be checked regularly, remove the dirt, and in the processing of surface coated with anti rust oil.

NSF Approval Volumetric Piston Brass Remote Reading Gallon Water Meter

3, after installation, should be regularly checked, the main inspection items:

(1) sealing surface wear.

(2) the trapezoidal thread wear stem and stem nut.

(3) packing is outdated, should be replaced if damaged.

(4) the valve repair assembly, the sealing performance test should be carried out.

The NSF Approval Volumetric Piston Brass Remote Reading Gallon Water Meter greasing maintenance work

Before the welding operation of the valve before and after commissioning professional conservation work, as the valve manufacturing operations in the service plays a vital role, correct and orderly and effective maintenance will protect the valve, the valve function and prolong the service life of the valve. Valve maintenance work may seem simple, but in fact it is not. Work often neglected aspects.

First, the valve grease, often overlooked issue of the amount of grease. Grease gun refueling, the operator select valves and grease coupling method, the grease job. There are two kinds of situations: on the one hand, less fat less grease, sealing surface accelerated wear due to lack of lubricant. On the other hand, excessive grease, resulting in a waste of. That there is no according to valve type category, the sealing capacity of different valves accurately calculated. Can be calculated valve size and type of seal capacity, and then injected into a reasonable amount of grease.

Second, the valve grease, often ignore the problem of stress. Operation in the grease, the grease pressure peak and valley was changed regularly. The pressure is too low, the seal leakage or failure, the pressure is too high, the injection port congestion, sealed within the lipid hardening or sealing ring and the valve ball, valve plate locking. Usually grease injection pressure is too low, grease into the valve chamber over the bottom, generally occurs in a small gate. While the grease injection pressure is too high, on the one hand to check the grease nozzle, such as pore blocking fat replacement to identify the situation; on the other hand the lipid hardening, to use the cleaning fluid, repeatedly soften the failure of sealing grease, and inject new grease replacement. In addition, the seal type and sealing materials, also affected the grease seal pressure, different forms have different grease injection pressure, in general hard sealing grease injection pressure is higher than the soft seal.

Third, the valve grease, pay attention to the valve in the switch position problem. Maintenance when the ball valve in the open spaces in general, special circumstances to choose to close the maintenance. Other valves can not be punished in order to open spaces. When the valve in the conservation must be closed, to ensure that the grease seal along the trenches filled with ring, if the open position, sealing grease flow directly into the cavity or valve, resulting in a waste of.

Fourth, the valve grease, the grease effect often ignore the problem. Injection pressure, fat operation amount of grease, the switch position are normal. But to ensure that the valve greasing effect, and sometimes need to open or close the valve, lubricating effect on the inspection, confirmed that the ball valve or gate surface lubrication uniform.

Fifth, the grease, should pay attention to body and plug the pressure relief discharge problem. Pressure test valve, gas valve chamber sealed chamber and the water temperature rises due to step-up, when to conduct the sewage grease relief, in order to facilitate the smooth progress of the work the grease. The grease seal cavity of the air and water are full replacement out. Timely release the pressure valve cavity, but also guarantee the safe use of the valve. After greasing, be sure to tighten the wire blocking the sewage and pressure relief, to prevent the accident.

Sixth, the grease, we should pay attention to the issue of fat evenly. Normal grease, the grease away from the port hole nearest the fat out of fat first, then to low, and finally the high point, successive fat. If not by law or not fat, prove the existence of congestion, Qingtong processing.

Seventh, the grease should be observed when the size of valve and seat ring flush problem. Such as ball valve, open spaces if there is interference, can be adjusted to the Volumetric Piston Plastic Remote Reading Gallon Water Meter with NSF Approval, after the lock confirmation straight path. Adjust the limit not only the pursuit of a party on or off position, to consider the overall. If the open position flush, customs are not in place, will cause the valve loose. Similarly, adjusting the relations in place, also want to consider to open a corresponding adjustment. Ensure that the right angle valve travel.

Eighth, the grease, the grease must seal the mouth. To avoid impurities, fat mouth or injection of lipid oxidation, rust proof seal to apply grease, avoid rust. Applications for the next operation.

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Dec 01 2014

The structure and working principle of the meter

Rotor type water meter is a speed type water meter, water meter varieties in the world is the most used.

Turbine Woltman Type Water Meter

In the national standard, the definition of velocity meter for “installed in the closed pipe, consisting of a power element, a water meter and flow speed by directly makes its obtain movement”. When the water flow through the meter, driving the impeller (rotor or spiral wing) rotation, and flow rate and impeller flow speed is proportional to, because the section area of nozzle flow driving impeller for constant speed and flow is also proportional to the impeller. Through the linkage components on the impeller shaft is connected with a counting mechanism, make the counting mechanism (cumulative impeller rotor or spiral wing) rpm, so write down through the meter of water.

Rotor multi beam type water meter is composed of a case, Turbine Woltman Type Water Meter, table glass, sealing washers, a measuring mechanism, a counting mechanism and strainer etc.

Rotor type water meter gear box at the bottom of the general had about three of the fixed rib, its main function is to, when the water meter in the large flow operation, on the impeller rotation damping effect, to improve the water meter in the performance curve of large flow area. Because when very small flow through the meter, the flow rate is very low, the minimum kinetic energy flow, not enough to overcome the inertia of the impeller, impeller without rotation. The question slightly increase velocity, impeller is rotating, but cannot accurately measure the range of flow meter, so the minimum flow following a slow phenomenon. Then gradually increase velocity, water meter to the fast development trend, if there is no gear box on the bar to damping, this trend will continue until around 10% ~ 15% after partial fast (compared with rib damping), the performance curve will tend to smooth.

In recent years, the Woltman Type Bulk Cold(Hot) Water Meter  improved significantly, but part of the pipeline is also the existence of rust, flax, iron and sand and other impurities, these impurities with the flow meter inlet end to. In order to prevent impurities from entering the meter movement, causing water fault, so on the water inlet end are provided with filtering net. Is a bowl shaped strainer used, set outside in the impeller box, this structure the dirt holding capacity is bigger, and even blocked a part of mesh after measurement capability also less affected; the other is a barrel shaped filtering net is arranged on the water meter shell, water inlet side, effect than the bowl shaped strainer differential.

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Sep 17 2014

The basic structure and principle of prepaid water meter, the characteristics, advantages and development prospect of performance

The traditional “water first, pay after” into “first payment, after the water”, to effectively solve the charge problem. Detailed design flow using EM78 MCU to design the specific hardware circuit diagram and software are given.

(1) without the need of manual meter reading, and is conducive to modern management. With the “implementation of a table” one household, the meter number of power supply enterprise management increases dramatically, installing prepaid electric energy meter is used for

prepayment water meter

Strengthen the modernized management of electric enterprises, improve the best choice for a service level. The use of prepayment electric energy meter also avoid manual meter reading charge door the inconvenience caused to customers, and the history of  prepayment water meter can be saved, convenient customer query.

(2) fully reflects the commodity attribute of water. Prepaid water meter according to the principle of the implementation of commodity exchange, buy water after the water, completely changed the traditional water charging mode, fully embodies the commodity property of hydraulic. Customers can according to their actual needs to have a plan to buy water, water, does not occur late fees due to arrears, add unnecessary expenses.

(3) to solve the problem of fees. Can well solve the problems of scattered residential customers fees, temporary water customers, customers often in arrears.

A, use and scope:

For total volume measurement and control water flowing through a water supply pipeline. The table has the advantages of high reliability, high precision, low power consumption characteristics. The parameters meet the national standard (GB/T778.1-3-1996) and urban construction industry standards (CJ/T133-2001) requirements.

Two, function characteristics:

1, the use of radio frequency card, without any exposed electrode, good humidity resistance, easy to use.

2, through the double key encryption of user card, a card of a secret.

3, with a card table, or a card table function.

4, with the remaining water is insufficient, prompting the user to timely purchase of water.

5, with the battery voltage is too low, to prompt the user to replace the batteries.

6, has the data read back, when the user card to purchase management center of water, can use the card corresponds to the total amount of water in the water meter, battery status, interference times read back to the management center.

7, small starting flow, high precision.

8, display function: surplus for the purchase quantity, content, cumulative content and other parameters can be effectively displayed on the LCD screen, the user can through the user card check table in the surplus water and total water use information.

The basic structure and principle:

The IC Prepaid Water meter and the general appearance of the appearance of similar water meter, the installation process is basically the same. The use of IC card water meter is very simple, from the user’s point of view, the IC card water meter is to plug in your. The working process of IC card water meter in general as follows: containing the amount of IC card is inserted in the IC card water meter reader, the microcomputer module identification and download the amount, the valve opens, the user can be normal water. When users of water, water collection device began to water collection, and converted to an electronic signal supply microcomputer module required for measurement, and the LCD display on the display module. When the amount of user of water drops to a certain value, the microcomputer module out sound alarm, prompting the user to the cardholder fee should buy water. If more than the amount of water, then the computer module automatically will electric control valve closed, cutting off the water supply. Until the user has been inserted IC card fee start to open the valve for water supply.

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Aug 27 2014

Electronic Remote Reading Water Meter principle, structure design, application, maintenance and classification.

Intelligent remote meter is a common signaling electronic acquisition module and the electronic module, signal acquisition, data processing, storage and data through the communication line to upload to the repeater, or handheld meter reading device. The body adopts the integrated design, it can real-time record and save the water used by users, each water meter has a unique code, when the intelligent water meter reading instruction received after immediately the water meter data to management system.

Electronic Remote Reading Water Meter

Remote meter reading system of electronic water meter with automatic meter reading mode to replace the traditional manual meter reading, and compared to similar meter reading system, adaptive, network structure characteristics of simple debugging, stable running, convenient extension.

Main function:

Real-time meter reading function, frozen meter reading, Electronic Remote Reading Water Meter, equipment file management, user file management,

Statistical data analysis, report query and print, operation authority management, payment settlement management, data analysis,

Data backup and recovery.

Typical applications:

Single copy: management center set up reading task, the system can automatically copy specified areas of the water meter data information, automatic meter reading function unattended. At the same time, the system also supports manual meter reading function, can copy meter data.

Single copy + remote control mode: water meter inside with valves, management center can at any time on the water meter remote valve, closing valve control.

Single copy + IC card control mode: in addition to have all the features of single copy mode, water meter with IC card circuit and a valve, may realize the IC card prepayment function. Management through the IC card charging control of water meter.

The main parameters:

Remote meter is a mechanical hot and cold water common basis, constitute a remote transmitting system plus, main control parameters selected for flow meter, commonly used flow, overload flow, minimum flow, transitional flow rate, the nominal pressure, the maximum allowable working pressure, pressure loss.

Selection:

1), water meter selection must first consider the water meter working environment: such as water temperature, working pressure, time, measurement range and the water quality of water were selected, then press through the design of flow meter, water meter pressure loss to produce close to and do not exceed the specified value to determine the water meter diameter. In general, nominal diameter less than DN50, should use the rotor type water meter; nominal diameter is more than DN50, should use the spiral wing type water meter; flow meter should be used when the variation range of compound water meter. Give priority to the wet water meter should be in interior design.

2), when the water is even, should be the common flow design flow does not exceed the water meter to determine the Single Jet Dry Dial Brass AMR Remote Reading Water Meter. When there is a fire flow and the need for calibration of flow rate, maximum flow rate is not more than the total water restrictions.

Application:

In the direct reading remote meter gradually overcome the technology difficulty is big, precision requirements of higher disadvantage entering the mature stage, pulse meter is already in the application specification product reliability, product technology, product in engineering and user recognition and entered the mature period. With the development of automatic meter reading market, pulse type, direct reading remote meter from opposition to unification, from exclusion to be complementary. There will be more and more manufacturers should the market demand, the left hand provides a pulse type, the right hand to provide direct reading. Direct reading water meter and pulse meter will be in for a long period of each share, two of the world, and sharing of automatic meter reading market a better future.

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Aug 21 2014

Error of Turbine Woltman Type Water Meter adjusting device, a counting mechanism, a rectifier and history

Turbine meter, refers to the helix axis and the axis of the tap water pipeline for water meter into parallel (or overlapping), the impeller adopts spiral wing shape. This is not to say that the level of the water meter can be installed. Of course, such as the water meter to vertical installation, should the water jewel plain end bearing selection inlet side spiral shaft bearing hole, in order to reduce friction, prolong the service life of the water meter. Imports of some types of spiral wing type water meter adopts dynamic balance technology, can work in horizontal, inclined and vertical state, but the class of measurement work in non horizontal state when the water to reduce the level of.

http://www.asmeter.com/datacache/pic/280_257_0bca250cacd15dbfd1c79b9bbe2da5ca.jpg

Nominal diameter 80 ~ structure level of Woltman water meter of 200mm indicated in Figure 2-12, in fact, object diagram see Annex C figure C.7. Turbine Woltman Type Water Meter is mainly composed of a watchcase, rectifier, error adjusting device, spiral wing, bracket, worm gear, a counting mechanism, sheet glass, sealing gasket and cover parts.

Common error adjusting device two.

(1) Combination Cold Water Meter

In part this adjustment device is a piece of flat and symmetrical paddle shaped adjusting plate, rectifying plate is positioned in the rectifier part. When the rotating paddle shaped adjusting plate, it can increase or decrease this part of water flow to the spiral rotation impact, thus plays the role of error. Paddle shaped error adjusting device has the advantages of simple structure, less components and easy processing and convenient assembly and disassembly, so widely used.

(2) the rudder type error adjusting device

The regulating device role is part of a flat plate, plate is provided with a shaft hole, the adjusting plate is arranged on the rectifying plate rectifier for shaft parts. The regulation error, a shaft on the other side the rudder shape adjustment plate, so that the adjusting plate around the axis of rotation, to increase or decrease the water flow to the spiral rotation impact, thus plays the role of error. The adjusting device is complex.

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Aug 16 2014

Plastic Single Jet Dry Dial Vane Wheel Water Meter product structure, characteristics, advantages and application principle

Water saving type leak proof water meter is in recent years for ordinary water in small discharge [state] not drop charges calculated case and the design and manufacture of precision meter. Common water meter because the rotating component and a counting gear movement inertia, so in the measurement process, if the water tap is opened, water trail to a certain degree, cannot promote the movement of the impeller and the counter gear, and small flow can not be measured, people can adopt the drip mode is less than the starting flow of the water meter does not measure to get water in the tap water, so that the water supply enterprises and management unit losses.

Plastic Single Jet Dry Dial Vane Wheel Water Meter

The water company in order to reduce the loss, specially manufacturing the Plastic Single Jet Dry Dial Vane Wheel Water Meter, water dripping, will slowly drip out of the water accumulation, when accumulated to a certain amount, promoting water wheel to rotate, so as to achieve the purpose of water metering.

1 use the water meter is used to measure the total flow through the water pipe water, suitable for unidirectional flow. For corrosive liquids, cannot use the water meter.

The 2 meter features: A. this water is wet water meter, and all the parts are immersed in water, the surface of the glass below have water is normal, not a fault.

3 the volume of water with a plurality of holes in a row of adjacent appeared in numbers is given, the meter, reasonable structure, high sensitivity, long service life.

Characteristic.

Environmental protection. The product appearance, which belongs to the product of green environmental protection, in accordance with the pure water supply condition.

Corrosion resistance of health. Corrosion resistance, no scale formation, long service life, can be exempted from the pipeline scaling and macular, rust. Long term without running water does not affect the water quality in the table, put an end to pollution two.

Lightweight and durable. The proportion is only the metal shell of the 1/7, reduce the transportation cost; good toughness, impact resistance.

To improve the measurement accuracy and measurement more accurate. 45 Degree Register Single Jet Dry Dial Vane Wheel Water Meter, dimension stability, conducive to the water meter calibration and reduce the pressure loss.

Easy installation, lower installation costs.

A school to reduce manufacturing costs, transportation costs, installation costs, lower than the metal shell of water meter.

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Jul 30 2014

The characteristics of prepayment water meter, installation notes, classification, use and disposal of common problems

The traditional “water first, pay after” into “first payment, after the water”, to effectively solve the charge problem. The detailed design process uses the EM78 series single-chip design of specific hardware circuit diagram and software is given..

prepayment water meter

(1) does not need manual meter reading, and is conducive to modern management. With the “one table” one household, the meter number of power supply enterprise management has increased dramatically, the installation of prepayment electric energy meter is used for

Strengthen the modernized management of electric enterprises, improve the service level of a best choice. The use of prepayment electric energy meter also avoid manual meter reading to the inconvenience charges to bring customers, and historical data can prepayment water meter, easy for customers to query.

(2) fully reflects the commodity attribute of water. Prepaid water meter according to the principle of commodity exchange, the first water after the water, completely changed the traditional water charging mode, fully embodies the commodity property of hydraulic. Customers can according to their actual needs to plan to buy water, water, no late fees and because of arrears, adding unnecessary expenses.

(3) to solve the problem of fees. 1, the use of radio frequency card, without any exposed electrode, moisture-proof performance, easy to use.

2, through the double key encryption card, a card a secret.

3, with a card table, or a card table function.

4, with the remaining water is insufficient, prompting the user to buy water.

5, with the battery voltage is too low, to prompt the user to replace the battery.

5, with the battery voltage is too low, to prompt the user to replace the battery.

6, has the data read back, when the user card to the management center for water, can use the card corresponds to the cumulative water consumption in the water meter, battery status, interference frequency read back to the management center.

7, small starting flow, high precision.

8, display function: surplus for the purchase of water, water, with a total content and other parameters can be effectively displayed on the LCD screen, the user can through the user card check table in the surplus water and total water use information.

Installation:

Installation:

1, choose water should be used according to the pipeline flow less than or close to common flow meter is appropriate, not only to determine the water pipe diameter.

2, the installation location to avoid light pollution, drying, freezing, the frozen period, in addition to water pipes wrapped insulation, when not in use the water inlet end of the valve is closed, the outlet valve and open the water tap, can prevent water frost damage.

The meter must be installed level, so that the literal upward.

Installation of piping must be inside the tube gravel, silt, hemp and other debris washed clean after the installation of water meters, so as to avoid the water meter malfunction.

Installation of piping must be inside the tube gravel, silt, hemp and other debris washed clean after the installation of water meters, so as to avoid the water meter malfunction.

In order to measure accurately, the tap should be higher than the water.

The water meter installed on the boiler into such as pipes, should be installed check valve, prevent the return of hot water scalding water.

The water should not be directly connected with the pipeline, water meter and the pipeline should active interfaces (such as pipe joints, connecting screws, over the sealing gasket etc.). The installation of brass body IC card water meter, should not be excessive force caused by pipe and pipe fitting, so as not to damage the water meter.

The meter must be installed in the floor drain and smooth drainage.

The meter must be installed in the floor drain and smooth drainage.

Seven, transportation and storage

1, the water transportation should not be subject to severe shock. Save water meter should be in the original packaging, preservation of the local environmental temperature 0 ℃ -60 ℃, relative humidity below 95%, non corrosive gas in the air.

The water in the warehouse storage, stacking height of not more than 10 box, water meter stack single package put height of not more than 10, not only the water meter packaging open storage.

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Jul 24 2014

Processing method of Rotary Volumetric Piston Water Meter installation techniques, characteristics, operation process, working principle and common problems

Volumetric meter is also called the piston type water meter, is a constant flow type water meter. The national standard in the volumetric meter is defined as “installed in the closed pipe, by some to be a water meter chamber volume successive full known and discharge fluid and with fluid driven mechanism.

Rotary Volumetric Piston Water Meter

Volumetric meter with rotary piston type and disc type two series, when the water flow through the meter, the drive piston flow (circleRotating disc) (swing), and a piston cylinder (disk chamber) volume is constant, so, by counting the measured piston rotation mechanism

Turn (disc swing) times, can get through the Rotary Volumetric Piston Water Meter of water.

Product volume type water meter is the main rotary piston type water meter, see figure C.5 and figure C.6 appendix C. At present is mainly used for the measurement of pipeline pure water, water purification water to produce drinking water meter water Limited by Share Ltd Ningbo and Ningbo Donghai instrument channel limited company as the representative, in the water meter diameter is 8, 15 and 20ram. Volumetric meter repair debugging complex, high requirement on quality, used in China has not yet been widely. Under the action of water pressure, water from the lower water inlet into the measurement chamber, center 3 driven rotary piston 7 surround the measurement chamber shaft to rotate, and the water from the piston blank and piston and the measuring chamber wall surface formed by the air flows to the upper outlet, at the same time the piston rotates, connected by a rotating shaft 4 and shifting fork 5 and counting mechanism, so as long as the note of piston rotation times, can flow through the water volume. Under the action of water pressure, water from the lower water inlet into the measurement chamber, center 3 driven rotary piston 7 surround the measurement chamber shaft to rotate, and the water from the piston blank and piston and the measuring chamber wall surface formed by the air flows to the upper outlet, at the same time the piston rotates, connected by a rotating shaft 4 and shifting fork 5 and counting mechanism, so as long as the note of piston rotation times, can flow through the water volume.

Volumetric meter with rotary piston type and Yuan Pan type two series, its principle is, when the water flow through the meter. The drive piston flow (Yuan Pan) rotation (swing), and the piston cylinder (Yuan Pan chambers) volume is constant, so, by counting mechanism measured piston rotation (Yuan Pan wobble) number it can obtain the flow through the water, water meter.

Requirements of installation and operation:

Requirements of installation and operation:

A, flow direction must be with the table on the arrow direction; B, the installation position to avoid pollution and flooding

This table for the Rotary Volumetric Piston Type Plastic Water Meter, the piston principle, through the rotation of the piston to measure the amount of water through the pipe.

Housing for the pressure casting of brass or stainless steel precision casting, internal main parts use of carbon composite materials, the counter is fully enclosed structure, flow into a eight bit digital recording.

Measurement grade this table for the C class, high sensitivity, small starting flow, clear reading, easy to install, without any range limit.

Measurement of the surface is most suitable for direct drinking water.

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Jul 07 2014

introductionCombination Cold Water Meter classification, main control parameters and the implementation of standards

Water meter according to the medium temperature can be divided into cold water and hot water meter, water temperature 30 ℃ is the dividing line between the cold water meter: medium lower temperature is 0 ℃, the upper limit temperature is 30 ℃ water meter.

Combination Cold Water Meter

The main control parameters of cold water meter was chosen for water flow, flow, flow, overload, minimum flow boundary flow, nominal pressure, the maximum allowable working pressure, pressure loss.

Cold water meter main classification:

According to the different ways into the installation: horizontal, vertical water meter cold water meter.

According to the wing wheel structure is divided into: Woltman water meter, rotor type water meter.

In accordance with the immersion method counting machine is divided into: dry wet water meter, Combination Cold Water Meter.

Selected points:

1), water meter selection must first consider the water meter working environment: such as water temperature, working pressure, time, measurement range and the water quality of water were selected, then press through the design of flow meter, water meter pressure loss to produce close to and do not exceed the specified value to determine the water meter diameter. In general, nominal diameter less than DN50, should use the rotor type water meter; nominal diameter is more than DN50, should use the spiral wing type water meter; flow meter should be used when the variation range of compound water meter.

2), nominal diameter less than DN50 of the water meter, should according to the water supply system design flow using.

3), should be preferred dry water meter. In the non heating area specified by the state, and extreme minimum temperature below -4 ℃, indoor public part of the household water meters or adjacent to the northwest side wall should be used dry water meter, water meter. Such as the use of wet water meter should do heat preservation.

Edit the construction, installation points

1) General requirements

(1) the water should be easily accessible for reading (for example, do not use a mirror or a ladder), assembly, maintenance, disassembly and necessary “in situ” removing mechanism. In addition, on the quality of more than 25kg of the water meter shall be unhampered access to the installation site, so that the water meter can be attached to its working position or removed and the surrounding in the working position to provide appropriate space to install the lifting device and should consider the following points:

Need proper lighting installation location;

The floor should be no obstacles, and even hard and not slip.

(2) in all cases, especially in the table wells installed water meters off the ground, application of high enough to install water meters and fitting method to avoid contamination. When necessary, the table well should provide a clarifier or gutter drainage.

2) installation requirements

(1) the water meter should prevent to cause damage risk by the installation place around impact or vibration.

(2) the water cannot be caused by excessive stress of pipe and fittings. When necessary, the Woltman Type Bulk Water Meter should be installed in the base or carrier. In addition, the upstream and downstream should be properly fastened on one side, to ensure open or discharge water table, not by the stem the impact of water facilities for the moving parts

(3) the water meter should prevent the risk of damage caused by the limit temperature of water and the surrounding air.

(4) the water meter should prevent flood and rain.

(5) the water direction should be in conformity with the type.

(6) the water meter should prevent damage danger caused by external environmental corrosion.

(7) should always comply with the use of water as the ground of effective national laws and local regulations. The water meter as an electrical ground parts, in order to minimize the risk of operating personnel, the water meter and the connection bypass pipe should be permanent.

(8) in order to prevent the hydraulic conditions unfavorable (cavitation, surge and water hammer) caused water damage, preventive measures should be taken to.

(9) when necessary, measures should be taken to avoid sudden changes, close to the water meter flow section.

(10) spiral wing type water meter (also known as v Manchester meter) special installation requirements: the water meter disturbance on the upstream flow is sensitive, which cause large error and early wear. Flow under two types of perturbation velocity distribution and vortex distortion. The typical velocity distortion is caused by partially blocking the tube disorders, such as some closed valve, but this effect can be easily reduced to a minimum. The vortex is mainly caused by two or more elbow on different planes, this effect can be used to ensure the water upstream straight pipe have long controlled; if this is not possible, then install a straightening device.

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Jul 04 2014

Characteristics of the solution, the Turbine Woltman Type Water Meter performance parameters, common problems and development

Level Woltman water meter, also called vortex type water meter, water meter refers to the helix axis and the water pipe Zhou Xiancheng parallel (or overlap), the impeller adopts spiral wing shape. This is not to say that the level of the water meter can be installed. Of course, such as the water meter to vertical installation, should the water jewel plain end bearing selection inlet side spiral shaft bearing hole, in order to reduce friction, prolong the service life of the water meter. Imports of some types of spiral wing type water meter adopts dynamic balance technology, can work in horizontal, inclined and vertical state, but the class of measurement work in non horizontal state when the water to reduce the level of.

Turbine Woltman Type Water Meter

In the case, cover, table glass and a sealing washer together to form a sealed body, make the case within the tested water without leakage to the outside. According to the standard requirements, the Turbine Woltman Type Water Meter should be able to withstand the pressure of 1.6MPa, sustained pressure test pressure of 2.OMPa, 15min and 1min continued. Therefore, in the case, cover and table glass shall meet the requirements. The watchcase hole shall be lined with resistant liner rot material made of or coated with antirust coating with good.

Rectifier functions: one is to come from water upstream in turbulent flow in the rectifier through the grid, as far as possible the “out” into the state of laminar flow; two is provided with a shaft hole in the center rectifiers, to support the spiral shaft, axle hole and the shaft hole on the bracket should be coaxial, in order to ensure the spiral wing flexible rotation.

The role of stents: on the one hand supporting the helix axis, so that the spiral wing can rotate flexibly under flow action; on the other hand through a worm and worm wheel bracket and screw wing shaft is engaged, the spiral wing speed to the upper part of the bracket is connected with a counting mechanism.

Water meter Woltman water meter using spiral plate shaped impeller, also called spiral wing or wing wheel, enough mechanical strength engineering plastic generally use (such as ABS) injection molding. Spiral tube body is a hollow, to reduce weight and increase buoyancy. Spiral wing end is provided with a cover adhesive binder and, in case the measured water immersion after the increase of weight. Spiral wing has better dynamic balance performance, or when the high-speed operation, easy to make the spiral shaft and sleeve wear.

Common error adjusting device two.

(1) paddle error adjusting device

In part this adjustment device is a piece of flat and symmetrical paddle shaped adjusting plate, rectifying plate is positioned in the rectifier part. When the rotating paddle shaped adjusting plate, it can increase or decrease this part of water flow to the spiral rotation impact, thus plays the role of error. Paddle shaped error adjusting device has the advantages of Woltman Type Bulk Cold(Hot) Water Meter, less components and easy processing and convenient assembly and disassembly, so widely used.

(2) the rudder type error adjusting device

The regulating device role is part of a flat plate, plate is provided with a shaft hole, the adjusting plate is arranged on the rectifying plate rectifier for shaft parts. The regulation error, a shaft on the other side the rudder shape adjustment plate, so that the adjusting plate around the axis of rotation, to increase or decrease the water flow to the spiral rotation impact, thus plays the role of error. The adjusting device is complex.

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