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2.1 The pressure relief valve set with 1 should be rotated periodically. Most of the high-rise building life supply water pressure relief valve decompression protection system is based on the vertical partition of the water supply, and is generally set on each water supply subdivision main pipe. Taking into account the reliability and reliability of water use for a large number of users (having dozens of households and up to 100 households in each subdistrict of a residential building, public buildings such as hotels and restaurants, and dozens of rooms in each sub-district ...), the pressure reducing valve should be designed in parallel. Installation (1 with 1 spare). Both sides of the decompression passage are supplemented by gate valves or butterfly valves, which can open or close any decompression passages. In order to allow the two parallel pressure relief valve passages to work properly, they are exchanged once a month in a routine manner, and they are left for a long time. Scaling, decompression element spool will jam.
3. The product gas in the pipeline should be eliminated in time. When the air enters the pressure-relief pipe network or the pressure in the pipe network changes with pressure, the gas will precipitate from the water. At this time, the user's water pressure in the area is extremely unstable. At the most unfavorable point of the water supply, the pressure of the water is suddenly changed, and sometimes it is false. The peak pressure, sometimes sucking off water, and the pipe network will accompany the crash. This phenomenon will affect the stable operation of gas water heaters, electric water heaters, etc., and it will be destroyed in serious cases. The destruction of the water inlet connecting pipes for various washing utensils is also very destructive, especially for some currently used composite connecting hoses. The intensity is poor, so the incidents of tube burst occur repeatedly; some water meters can not measure correctly, there is no water for users, and the water meter will continue to rotate. In order to prevent such accidents, it is necessary to check whether the water storage elevation of the main water supply pipe of the roof tank is satisfied. If the water spout at the outlet of the water tank is not satisfied, air is sucked in. Excluding this fault, the lowest level elevation of the level controller in the tank can be adjusted. Experience shows that the general minimum level should not be less than 0.3m from the outlet. It is also possible to repeatedly open pressure gauges placed on both sides of the partition and decompression system to release the cyclone plug, and slowly discharge the air that has entered the pipe network. If the above measures are taken, some of the water appliances below the end of the subdivision can also exhibit the above phenomenon. An automatic exhaust device can be added to these locations.
4. Pay attention to the pressure relief valve decompression protection system. Regardless of whether a proportional valve or an adjustable pressure reducing valve is used, the decompression ratio P1:P2 should not be selected too large, and generally should be controlled within 5:1. Exceeding this range can easily lead to cavitation, damaging valve parts and generating howling noise. Some piston type pressure reducing valve, the manufacturer processes a small hole of about 1.5mm in diameter on its valve body, its function is to make the valve core play a breath-breathing effect, maintenance management should pay attention not to the small hole Plugged, otherwise affect the normal operation of the pressure reducing valve.
5. To strengthen the management patrol of the pressure relief valve protection system, it is necessary to observe the working status of the pressure relief valve itself. Pre-valve and post-valve pressure values ​​are close to each other, indicating that the pressure reducing valve itself has a malfunction. That is, the flat sealing rubber between the valve plug and the valve body of the piston pressure reducing valve is damaged; the main valve diaphragm of the diaphragm adjustable pressure reducing valve has cracks and the O-ring is damaged, and the connecting pipe of the pilot valve is blocked, resulting in decompression. Decompression of the valve weakens or fails. This poses a great hazard to the district pipe network. In particular, many water equipments may burst due to overpressure and must be repaired in time. Proportional (piston type) relief valve body through the suction hole if there is more than a trickle, indicating that the valve core O-ring several files have been worn, to replace the seal. However, when repairing and dismantling decompression elements, care must be taken to replace the internal seals; when removing debris, it is advisable to use the advantages of the situation. Do not use metal rods, hard stem valves, and use wood hammers and wooden handles to shake. Slowly remove the valve components. When reinstalling after repair, be sure to match the flow direction on the valve.
6. Check the installation position of the proportional pressure reducing valve. The location of the high-level pressure relief valve design and installation is not appropriate. Pressure will appear after the pressure relief valve. The pressure of the pipe network will deviate severely from the allowable range. The damage to the shower, water pipe burst and damage to the user's water meter will occur; sometimes The water flow will not be smooth, and there will be irregular water cuts in the subdistricts, affecting users' water use. A similar accident occurred, check the entire decompression valve decompression partition water supply system, no doubt can be found; remove the pressure reducing valve filter and other components are no exception; some property management units even suspect the technical performance of the valve, repeatedly replaced new Pressure reducing valve does not solve the problem either. At this time, we can examine whether the installation position of the proportional pressure reducing valve is reasonable or not and carefully check whether there is an equilateral inverted siphonage phenomenon in the pipe network system. This kind of situation is easy to appear in the water supply system of the main and auxiliary buildings and the same roof water tank. In order to find these problems, we can consider to increase the installation position of the proportional pressure reducing valve to a level (it cannot be raised too high and must take into account pressure-requirement specifications of water equipment in the entire sub-zone); it can also be divided into two groups in the main and auxiliary buildings. Proportional pressure relief valve water supply system.
How to maintain the use of pressure reducing valve to extend the service life
1. To avoid the retention of dirt and debris into the pressure relief valve decompression protection system. The decompression system pipe network for new construction or renovation projects is likely to leave sand, flax, and debris. Before commissioning, water flushing should generally be carried out. After the cleaning requirements are met, the pressure reducing valve and the filter element are finally installed so as to avoid miscellaneous flow into the pressure reducing valve and prevent the core phenomenon of the pressure reducing valve. After the system enters the work, ensuring the smooth flow of the decompression system is closely related to the capacity of the filter installed on the system. If the filter element is seriously adsorbed by debris, it will affect the work of the pressure reducing valve. The filter is checked regularly to remove contamination. Practice shows that this work must be carried out once every two to three months. Some adjustable (spring-type, diaphragm-type) pressure reducing valves have their own main or pilot valve equipped with a filter. It is also necessary to dismantle and filter the filter on a regular basis.