Above the safety valve of the type of
gear pump displacement gear pump with safety valve with spring-loaded safety valves and safety valve two forms of one action. Safety valve back seat pressure Ph when the gear pump discharge pressure is less than the safety valve back seat pressure relief valve that is shut down. On action safety valve apparently back seat pressure Ph. When the gear pump discharge pressure is greater than the pressure Pk of Kai jump, the safety valve opens, so that the pressure is released to a predetermined extent. The sealing pressure of the safety valve of the sealed pressure Pm Pm of the gear pump should be equal to the allowable maximum discharge pressure Pd (reciprocating pump means multicylinder pump liquid collection tube, or the discharge pressure of the liquid in the buffer tank). If the actual operating pressure of the pump is lower than the allowable maximum discharge pressure safety valve in accordance with the actual operating pressure to adjust the sealing pressure.
In a sealed under pressure, the safety valve may not have any leaks. Displacement
gear pump safety valve is usually installed in the gear pump outlet manifold tube, such as a discharge buffer tank to be installed in the the discharge buffer tank behind the first front of the valve (shut-off valve). Important subsidiary of the components of the safety valve displacement gear pump, each displacement gear must be equipped with safety valves, if the pump-owned from time to separate. Gear pump safety valve repair is primarily on the safety valve of the sealing surface of the repair, so have high requirements on the safety valve sealing surface material, the basic requirements are: a high strength, can withstand a higher sealing pressure ratio: There are certain impact toughness, can withstand spool fast takeoff back seat impact: higher hardness, can withstand medium erosion: can not rust, otherwise leak soon: high temperature, steam and other media can be applied, so that high temperatures softened: to be corrosion-resistant, can withstand acid erosion.
