How to use gear pump above the safety valve gear pump above the type of safety valve displacement gear pump safety valve with a spring-loaded safety valve and a safety valve in two forms. Safety valve seat pressure Ph When the gear pump discharge pressure is less than the safety valve seat back pressure, the safety valve is closed. There is clearly no relief pressure on an actuation safety valve Ph. When the gear pump discharge pressure is greater than the start-up pressure Pk, the safety valve that is open, the pressure released to a predetermined level. Sealing pressure Pm The sealing pressure Pm of the safety valve should be equal to the allowable maximum discharge pressure Pd of the gear pump (the pressure of the liquid after the reciprocating pump means the multi-cylinder pump or the discharge buffer tank). If the actual operating pressure of the pump is lower than the allowable maximum discharge pressure, the safety valve shall adjust the seal pressure according to the actual operating pressure. Under the sealing pressure, the safety valve shall not have any leakage. Safety valves for positive displacement gear pumps are usually fitted to the gear pump outlet manifold and provided with a discharge buffer tank in front of the first valve (ie shut-off valve) behind the discharge buffer tank. Safety valve is also an important ancillary components of positive displacement gear pump, safety valve for each volume of gear are required, if the pump can be provided separately. Gear pump safety valve repair is mainly on the safety valve sealing surface repair, so the valve sealing surface materials have higher requirements, the basic requirements are: a higher strength, can withstand higher sealing pressure: there is a certain Impact toughness, can withstand the rapid rebound valve spool back impact: a higher hardness, can withstand media erosion: can not rust, or leak quickly: to high temperature, steam and other media can be applied, will not soften the high temperature: To corrosion-resistant, can withstand acid-base erosion.
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