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The safety valve is also an important accessory part of the positive displacement gear oil pump. Each positive displacement gear needs to be equipped with a safety valve. If the pump is self-provided, it is not necessary. The repair of the gear oil pump safety valve is mainly to repair the sealing surface of the safety valve, so there are higher requirements for the sealing surface material of the safety valve. The basic requirement is: high strength, can withstand high sealing pressure: a certain degree Shock resistance and toughness, can withstand the impact of the rapid take-off and return of the valve core: high hardness, can withstand medium erosion: can not rust, otherwise it will leak quickly: to be resistant to high temperature, can be applied to steam and other media, and will not soften at high temperature: To be corrosion resistant, can withstand acid and alkali corrosion.
The type of safety valve on the gear oil pump The safety valve for positive displacement gear pump has two forms: spring safety valve and one-time safety valve. Types of safety valve on the gear oil pump Safety valve for positive displacement gear pump has spring safety valve and There are two forms of one-time action safety valve.
Safety valve seat pressure Ph When the discharge pressure of the gear oil pump is less than the safety valve seat pressure, the safety valve is closed. Obviously there is no return pressure Ph for the one-time safety valve. When the discharge pressure of the gear pump is greater than the kick-off pressure Pk, the safety valve is opened to release the pressure to a predetermined level.
Sealing pressure Pm The sealing pressure Pm of the safety valve should be equal to the maximum allowable discharge pressure Pd of the gear oil pump (for reciprocating pumps, it refers to the pressure of the liquid after the manifold of the multi-cylinder pump or the buffer tank is discharged). If the actual operating pressure of the pump is lower than the maximum allowable discharge pressure, the safety valve should adjust the sealing pressure according to the actual operating pressure. Under the sealing pressure, the safety valve must not have any leakage. The safety valve of positive displacement gear oil pumps is usually installed behind the outlet header of the gear pumps. If there is a discharge buffer tank, it must be installed in front of the first valve (ie shut-off valve) behind the discharge buffer tank.
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