Operation of Rexroth pressure reducing valves

1. It is necessary to avoid the retention of dirt and debris into the pressure reducing valve pressure reduction guarantee system. The pipe network of the pressure reduction system of the new or renovated project is likely to leave sand, hemp silk and debris. Before it is put into operation, it should generally be flushed with water, and after meeting the cleaning requirements, the pressure reducing valve and filter element should be finally installed, so as to avoid the flow of debris into the pressure reducing valve and eliminate the phenomenon of pressure reducing valve jamming. After the system enters the work, to ensure the smooth flow of the water of the pressure reducing system, and the flow capacity of the filter set on the system is closely related, if the filter element is seriously adsorbed by debris, it will affect the work of the pressure reducing valve, so it is necessary to check the filter regularly and remove the dirt in time. Practice shows that this work must be carried out once every 2 to 3 months, and some adjustable (spring-type, membrane-type) pressure reducing valves, whose main valve or pilot valve sets its own filter, also need to be dismantled and cleaned regularly.

2. Rexroth pressure reducing valve 1 with 1 backup pressure reducing valve group should be rotated regularly. The pressure relief guarantee system of the domestic water supply pressure reducing valve in most high-rise buildings is set up in the vertical partition of the water supply, which is generally located on the main pipe of each water supply zone. Considering the reliable and safe water supply of many users (there are dozens to hundreds of households in each partition of the residence, and dozens of sets ......of guest rooms in each partition of public buildings such as hotels and restaurants), two sets of pressure reducing valves should be installed in parallel (1 for 1 use and 1 standby) during the design. Both sides of the pressure reducing channel are supplemented by gate valves or butterfly valves, which can open and close any pressure reducing channel, in order to make the two sets of pressure reducing valve channels in parallel can work normally, the conventional monthly rotation exchange, shelving time is too long, the stagnant water of the pressure reducing channel is scaled, and the valve core of the pressure reducing element will be stuck and failing.

3. Rexroth pressure reducing valve should remove the gas in the pipeline in time. When the air enters the pressure reducing pipe network or the gas precipitates out of the water with the change of pressure in the pipe network, the water pressure of the user in the area is extremely unstable; At the most unfavorable point of the water supply, the pressure of the water supply is even more abrupt, sometimes showing false peak pressure, sometimes sucking and cutting water, and the pipe network will be accompanied by a crashing sound. This phenomenon will affect the stable operation of gas water heaters and electric water heaters, and will be destroyed in serious cases; The water inlet connection pipe of various toilet utensils is also very destructive, so the incident of pipe bursting occurs frequently; Some water meters cannot be metered correctly, and the water meter will continue to rotate when the user does not use water. In order to prevent this kind of accident, it should be checked whether the water storage elevation of the domestic water supply main of the roof tank is satisfied, if it is not satisfied, the water swirl will be generated at the outlet of the water tank, and the air will be inhaled. Eliminate this fault can adjust the water level elevation of the liquid level controller in the water tank, and experience shows that the general water level should not be less than 0.3m from the water outlet. It is also possible to repeatedly open the pressure gauge and release on both sides of the partition and pressure reduction system to slowly discharge the air that has entered the pipe network. If, after taking the above measures, the above phenomenon occurs in some water appliances below the end of the sub-district main pipe, an automatic exhaust device can be added to these parts.

4. The pressure reduction guarantee system of Rexroth pressure reducing valve. Regardless of the choice of proportional or adjustable pressure reducing valve, the pressure reduction ratio P1:P2 should not be too large, and should generally be controlled within 5:1. Exceeding this range is prone to cavitation, damaging the valve and generating acoustic noise. Some piston pressure reducing valves, the manufacturer processes a small hole with a diameter of about 1.5mm on its valve body, its function is to let the valve core play a role in air penetration and suction when moving, and attention should be paid to not plug the small hole during maintenance and management, otherwise it will affect the normal operation of the pressure reducing valve.

5. Strengthen the management and inspection of the pressure reducing valve guarantee system, and pay attention to the working dynamics of the pressure reducing valve itself. The pressure values before and after the valve are similar, indicating that the pressure reducing valve itself has failed. That is, the flat sealing rubber parts between the valve core and the valve body of the piston pressure reducing valve are damaged; The diaphragm of the main valve of the diaphragm of the diaphragm adjustable pressure reducing valve is cracked and the O-ring is damaged, and the connecting pipe of the pilot valve is blocked, resulting in the weakening or failure of the pressure reducing valve. This is extremely harmful to the zonal pipe network, especially many water equipment may burst due to overpressure, which must be repaired in time. If the suction hole on the body of the proportional (piston type) pressure reducing valve does not stop dripping, it indicates that the O-ring on the valve core has been worn out and the seal needs to be replaced. However, when repairing, disassembling and assembling pressure reducing components, it is necessary to be cautious and careful, and replace the inner seals; When cleaning up the debris, you should take advantage of the situation, do not use metal rods and hard stems to pry the moving parts of the valve, use a wooden hammer and wooden handle to knock and vibrate, and slowly disassemble the internal parts of the valve. When reinstalling after repair, be sure to follow the flow direction indication on the valve.

6. Pay attention to check the installation position of the proportional pressure reducing valve. If the design and installation position of the pressure reducing valve in the high-rise of Rexroth pressure reducing valve is not appropriate, the pressure behind the pressure reducing valve will fluctuate, the pressure of the pipe network will seriously deviate from the allowable range, and accidents will occur such as destroying the shower, bursting the water pipe and damaging the user's water meter. Sometimes the water flow is not smooth, and there is an irregular water cut in the partition, which affects the water consumption of users. In the event of a similar accident, check the water supply system of the entire pressure reducing valve pressure reduction zone, and there is no doubt that the point can be found; There is nothing abnormal in disassembling components such as pressure reducing valves, filters, etc.; Some property management units even doubt the technical performance of the pressure reducing valve, and replacing the new pressure reducing valve several times cannot solve the problem. At this time, we can start by checking whether the design and installation position of the proportional pressure reducing valve is reasonable, and carefully check whether there is an isometric inverted rainbow pipe phenomenon in the pipe network system, that is, the output pipe elevation of the partition is similar. This kind of situation is easy to occur in the main and auxiliary buildings on the same roof water tank, under the water supply system. If these problems are found, you can consider raising the installation position of the proportional pressure reducing valve by one level (it cannot be raised too high, and the pressure specification requirements of the water equipment in the zone must be taken into account); It is also possible to set up two sets of independent proportional pressure reducing valve water supply systems in the main and auxiliary buildings.

Operation of Rexroth pressure reducing valves

Operation of Rexroth pressure reducing valves

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