Proxy for German DUNGS pressure reducing valve FRS505 original factory

Proxy for German DUNGS pressure reducing valve FRS505 original factory

The special metering slot of the German DUNGS pressure reducing valve FRS505 is used to drive small displacement double acting cylinders that require precise metering. This valve core is used in conjunction with a special double acting check plunger, which has a very small drainage hole through the center to alleviate any internal high-pressure leaks. Single acting check plug (special unloading) can use a special single acting unloading check plug to prevent pump damage. Every time the single acting cylinder retracts, it generates flow from system pressure relief and can also operate other upstream or downstream functions simultaneously. The adjustable spool stroke and spool stroke limit adjustment screw can be used to limit the spool spool spool from being used and then turned to a larger feedback pin.

Using larger pins will reduce the available port pressure for this feature. If it is necessary to increase the pilot pressure to maintain the port pressure, the speed may become too high at low loads, and a flow restrictor may need to be used in the actuator port. Especially many water equipment may burst due to overpressure and must be repaired in a timely manner. If the small hole on the valve body of the proportional (piston type) pressure reducing valve has continuous dripping, it indicates that several O-ring seals on the valve core have worn out and need to be replaced. But when repairing and disassembling pressure reducing components, be careful and replace the internal seals; When cleaning up debris, one should guide according to the situation and avoid using metal rods or hard stems to pry open the moving parts of the valve. Use a wooden hammer and handle to strike and vibrate, and slowly disassemble the internal components of the valve.

Proxy for German DUNGS pressure reducing valve FRS505 original factory

When reinstalling after repair, be sure to keep it consistent with the flow direction indication on the valve. Check the installation position of the proportional pressure reducing valve. Undoubtedly, there is a point to be found; Disassembling the pressure reducing valve filter and other components showed no abnormalities; Some property management units even doubt the technical performance of pressure reducing valves, and repeatedly replacing them with new ones cannot solve the problem. At this point, we can start by checking whether the design and installation position of the proportional pressure reducing valve is reasonable, and carefully inspect whether there is an equal position inverted siphon phenomenon in the pipeline system, that is, the output pipeline elevation of the partition is similar. If the pilot signal generated by load sensing is applied to the inlet and outlet throttle valve cores, and is opposite to the commanded pilot pressure, it is called an internal pilot pressure reducing valve

If a small direct acting pressure reducing valve is installed outside the main valve body, it is called an external pilot operated pressure reducing valve. Compared with the direct acting pressure reducing valve, a nozzle baffle amplification section consisting of nozzle 4, baffle 3, fixed orifice 9, and chamber B has been added. When there is a slight change in the distance between the nozzle and the baffle, it will cause a significant change in the pressure in chamber B, tending to close both valve cores. Due to the phase difference between the inlet and outlet throttle valve cores (inlet throttle requires higher pilot pressure to open), the inlet throttle valve core will close the flow before the outlet throttle core will direct the flow to the tank. In this way, when the function fails, there is actually no power loss,

This feature shifts valve operation to the flat part of the pressure compensation curve when the set value is lower than the system pressure setting, especially when the problem occurs at low flow rates. Proportional slide valve core. When the inlet is closed at zero position, two different springs can be used to provide different inlet throttling opening pressures (requiring pilot pressure to initiate flow from the inlet to the actuator port). A combination of an outlet throttle valve and a pressure controlled inlet throttle element provides acceleration control with minimal braking. Typical applications include rotary drive and propulsion functions that do not require brake control or use mechanical braking to complete brake control. The small flow option provides finer throttling and smaller flow capacity of the valve core, while modifying the circuit, redistributing or separating functions allows for speed increase or decrease

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