Pressure Relief Valve Can Not Be Installed In Reverse

Pressure Reducing Valve can not be installed in reverse, gas pressure  reducing valve can not be installed in reverse, steam pressure reducing valve  can not be installed in reverse, why? Why is that?

Cast Iron Gate Valve Manufacturer says that the oil inlet and outlet of the  pressure reducing valve is inversely connected, i.e. the oil inlet is connected  to the oil outlet of the pressure reducing valve; Connect the load to the oil  inlet of the pressure reducing valve. In this way, one is when the oil pressure  is lower than the pressure relief valve setting pressure, the pressure relief  valve valve is unchanged, that is, to maintain the normal open state; Second,  when the oil pressure is higher than the pressure relief valve to set the  pressure, the pressure relief valve guide valve opened, the pressure relief  valve mouth closed small, even closed, a small amount of oil through the guide  valve leakage back to the tank.

1. The valve can reduce static pressure and dynamic pressure at the same  time.

2. The basic principle of the pressure reducing valve is by the flow of the  valve on the local resistance to reduce water pressure, water pressure drop  range is connected to the disc film or piston on both sides of the inlet and  outlet water pressure difference automatic regulation, so both dynamic pressure  reduction (water flow) and static pressure reduction (flow is 0); In particular,  it can reduce pressure without affecting water flow.

3. The term "reducing static pressure" is generally inaccurate in the strict  sense, because the word "reducing" implies an energy loss and there is no energy  loss in the above static state. Therefore, in fact, the pressure reducing valve  static pressure is the use of hydraulic balance principle to make the pressure  reducing valve in the closed state to partition upstream and downstream and  maintain (or control) a lower, stable downstream pressure value.

4. The principle of dynamic pressure reduction is to make the reducing valve  in a state of energy loss and over-current. For the pressure relief valve, the  gap is automatically adjustable, unlike the pressure relief orifice (orifice  fixed), this is the adjustable adjustable type pressure relief valve, but also  in the use of pressure relief valve, before the valve, the valve after the  pressure and not too large reason.

Pressure reducing valve supplied from Cast Iron Gate Valve Suppliers China,as  an example, the system under the condition of no water OR water will not flow,  OR pressure reducing valve is closed, the valve core exports and reducing valve  inlet are separated, so the valve outlet pressure will not suffer the effect of  inlet pressure, this also explains the building Lord said P = just rho gh  problem, because the outlet pressure reducing valve and relief valve before the  valve is not relevant.