Valve operating mechanism and performance test electronic intelligent water-saving valve

Valve operating mechanism and performance test electronic intelligent water-saving valve

Valve is a product, the appearance of quality on the one hand is the image of the product, on the other hand installed in the valve well, sometimes soaked in water, sometimes located in a wet space, prevent corrosion is important. The valve is to transport drinking water equipment, body lining material must be non-toxic, to corrosion resistance, wear resistance, to smooth, so that the flow resistance is small. In particular, the butterfly valve butterfly plate, pressure plate, bolt, butterfly plate quality is different, it is easy to electrochemical corrosion, corrosion generated rust extends to the sealing surface, affecting the sealing effect of the valve, so the lining to cover perfect.
Operating mechanism of valve
The pipes in the water supply network are usually buried in the dark, and the valves are well protected. The open and close valves are not suitable. The opening and closing valves strive to operate from the ground, so the opening and closing ends of the valves should be set with mortise caps, and the handwheel is not appropriate. The direction of opening and closing shall be clockwise rotating valve closing, and it shall be clear when ordering. The opening and closing degree of the valve should be marked with a marking plate, which should be observed from the ground. The scale of the marking plate should be cast on the casting and can be brushed with fluorescent powder for striking. Materials such as aluminum skin should not be used. The calibration of pointer and opening and closing limit should be adjusted and locked before installation. Recently, some manufacturers of small and medium caliber gate valves have designed corresponding opening and closing marking plates, which is commendable.
Valve performance and testing
When evaluating valve performance and performance testing, pay attention to the following points:
(1) The valve can be opened and closed flexibly and conveniently under working water pressure, and the opening torque can be detected by torque shifter under working water pressure.
(2) the valve is closed tightly, in 11 times the working water pressure, no leakage or leakage in accordance with the standard requirements (metal sealed butterfly valve), which requires the valve on both sides of the pressure in turn, respectively tested, and repeatedly open and close to achieve the same effect. Requirements of various caliber, different types of valves, should be in the manufacturers and units with testing qualifications, with load open and close life testing. This test also includes an evaluation of the valve shaft seal.
(3) The flow capacity of the valve is strong. In particular, butterfly valve, butterfly plate flow resistance to small, large flow effective area. This requires a variety of diameters, different types of valves should also be tested in qualified units, flow resistance coefficient measurement.
(4) The capacity of the valve body bearing internal water pressure should be consistent with the pipeline, that is, under the state of valve opening, the valve can bear the requirements of pipeline test pressure.
(5) in the inspection of the manufacturers, individual valve factories can carry out DN≤600mm valve life, flow resistance, torque and other tests, many valve factories do not have such means.
Inner lining and outer anticorrosion of valve
Valve is a product, the appearance of quality on the one hand is the image of the product, on the other hand installed in the valve well, sometimes soaked in water, sometimes located in a wet space, prevent corrosion is important. The valve is to transport drinking water equipment, body lining material must be non-toxic, to corrosion resistance, wear resistance, to smooth, so that the flow resistance is small. In particular, the butterfly valve butterfly plate, pressure plate, bolt, butterfly plate quality is different, it is easy to electrochemical corrosion, corrosion generated rust extends to the sealing surface, affecting the sealing effect of the valve, so the lining to cover perfect.
The ideal method is the valve body, valve cover, variable speed drive box inside and outside shot blasting sand, and then electrostatic spraying non-toxic epoxy resin, can achieve the above effect. In Tianjin, Shanghai related companies have this aspect of the small diameter valve operation line. Most manufacturers inside and outside the valve body brush coated with anti-rust paint, some paint containing lead and other harmful substances, do not meet the health requirements.
Valve specification
Valves are equipment, the following technical data should be marked on the manual when the equipment leaves the factory:
Valve specification; Model; Working pressure; Manufacturing standard; Valve body material; Stem material; Sealing material; Packing material; Valve opening and closing direction; Revolutions; Maximum opening and closing moment under working pressure; Manufacturer name: Date of manufacture: Weight; Connect the aperture, the number of holes, the center hole distance of the flange plate, and hope to indicate the length, width and height of the control size in a graphic way; Indicate flow resistance coefficient; Effective opening and closing times and matters needing attention in installation and maintenance.
Valve procurement
National valve manufacturers about more than 2000, henan province has more than 100, some manufacturers * a few people’s workshop, so the valve manufacturing quality and price is very sparse. To this end, strongly appeal to the concerned parties to rectify valve manufacturing industry, establish quality permit system, ban shoddy products. The following points should be noted when purchasing valves:
(1) Do not buy a single manufacturer, shop around.
(2) Choose and buy manufacturers strive to be through the ISO9001 quality system certification of the enterprise, and pay attention to the selected product is through the quality certification of the product.
(3) according to the different use of the valve, according to the above discussion of the problem, the argument, make good technical requirements.
(4) Higher quality valves, the price is correspondingly more expensive, should be based on the overall situation of the enterprise, in the performance price to choose to adapt to the needs of the enterprise products, can not be a model, the same price.
(5) The valve in the pipe network is opened and closed infrequently, but the loss of economic and social benefits is great if it is to be replaced and repaired. Therefore, it is a common desire to buy products with better quality and long-term unrepaired. If for a variety of reasons, the performance and price ratio is a little lower, it is necessary to consider the timeliness of product after-sales service.
(6) the valve is equipment, valve packaging should not be ignored, small caliber valves should strive for container transportation, large caliber valves should make corresponding packaging, to ensure the integrity of the valve in long-distance transportation. When necessary, the flange plate should be added to protect the sealing surface material does not change.
(7) Many tap water companies to purchase valves to carry out appropriate disintegration inspection, re test pressure inspection, unqualified products, non-payment measures, has a certain role, has not found that the product can be exempted from inspection.
(8) the valve should be stored in the warehouse, if the large caliber valve can not be placed in the warehouse, the open air should also pay attention to the bottom of the drainage, the above should be covered, never sun and rain. During the investigation, it was found that many new valves manufactured by manufacturers have been placed in the open air in the sun and rain, and so have the units using valves, which must be corrected.
Valve assembly
(1) Connection mode of valve and pipeline
In order to facilitate the assembly and disassembly of the valve, the general valve and pipeline connection side installation can be fixed expansion device, some enterprises for DN≤400mm valve with single disc coupling device (live flange) instead of fixed expansion device. Now some valve manufacturers have valve products with fixed expansion device, it is welcome, but the price of the general valve plus expansion device is also high is not reasonable, affecting its promotion and use.
(2) The valve should not enter the site too early
Pipeline construction is a long process, the construction person in charge is often worried about the supply of materials, the start of the valve and other auxiliary equipment to the site, or even according to the installation pile number one-time transport to the site, so that the valve in a few months on the site in the sun and rain, no supervision, the problem is easy to produce. It is suggested that in the process of pipeline construction, double flat pipes should be used to connect. After the pipeline construction is completed, debris in the pipe is cleaned and the valve Wells are laid (the precast reinforced concrete plate on the well is not covered), the valves are transported to the site for installation one by one, and then the finishing work of the well is completed. The large diameter valve installation of Beijing water company is to take such measures, which is worth learning from.
(3) inspection after valve assembly
The valve supervision and acceptance personnel shall check the assembly situation to see whether it meets the requirements of the drawings after assembling the valve on site; Whether it meets the needs of operation management; Opening and closing inspection, opening and closing indicator reading is consistent with the actual opening and closing situation; Whether the opening and closing revolutions are consistent with the instructions; Large caliber pipeline should also drill into the tube to check and clean the sealing surface; And make acceptance records, establish a good valve technical files.
Electronic intelligent water-saving valve is a new type of intelligent controllable water-saving valve. It can be applied to agricultural irrigation electromechanical well outlet, pressurized water distribution network, field water supply plug and other export control parts, and can realize automatic control of irrigation metering and artificial intelligence irrigation.
The technical characteristic of the valve is to realize the automatic opening and closing and metering of the valve through computer intelligent technology. It is installed in a pressurized water transmission pipeline, which can be accurately and automatically controlled by the user card (IC card) for water intake and water intake time. At the same time, its low energy consumption electromagnetic valve can realize energy self-sufficiency without cable. 1. SCM technology is used to measure and control the flow. 2. The use of computer technology to open and close the valve conditional control (using IC card pre-payment, data storage). 3. The valve is cleverly opened by the pressure of the water itself, so that the valve action is powered only by the battery. It can also be used in areas without power. 4. In the case of motor driving water pump, the motor can be switched on and off when the door is opened and closed.
This product can be used for control and measurement of water supply and distribution system of pressurized pipeline in irrigation area, and can also be used in urban and rural water supply network.