A keyway type safety valve

Abstract

The invention relates to a key groove type safety valve. A flat key type step is arranged on the surface, directly facing a valve body inner cavity, of a valve seat and internally sinks to form a flat key type groove. A plurality of high-pressure medium flowing channels are distributed in the flat key type groove. The high-pressure medium flowing channels communicate with a plurality of low-pressure medium flowing channels distributed outside the flat key type step through the valve body inner cavity. A valve plate assembly is arranged at a valve body and comprises a flat key type valve plate, double springs acting on the flat key type valve plate and double valve sleeves. The valve plate assembly and the flat key type step are arranged correspondingly so as to open or close the high-pressure medium flowing channels. The safety valve adopts the flat key type valve plate, so that the flowing area is increased, and the flowing speed of a medium become low; under the condition of the same flowing area, the flat key type valve plate bears less force, bearing force of the springs is improved, accordingly the using reliability of the valve can be improved, and the service life of the valve can be prolonged; and in addition, by adopting the double-spring and double-guiding structure, the bearing force of the single spring can be decreased by one half, and stationarity is better through double guiding.

Description

technical field [0001] The invention relates to a safety valve, in particular to a keyway type safety valve for a displacement pump. Background technique [0002] Positive displacement pump pressure is determined by outlet system load. In order to prevent the motor from being overloaded and damaged due to a sharp increase in the pressure in the positive displacement pump when the outlet pressure is abnormal, a safety valve must be installed on the positive displacement pump to achieve pressure relief through the safety valve. [0003] A traditional safety valve is usually composed of a valve body, a valve seat, a valve core, and a spring. When the pressure in the outlet of the pump reaches the pressure relief value of the safety valve, the valve core is forced to open, so that the inlet and outlet pipes of the pump are conducted, realizing pressure relief. However, because the pressure receiving surface of the traditional valve core is generally a circular surface, the are...

AI Technical Summary

Problems solved by technology

However, because the pressure receiving surface of the traditional valve core is generally a circular surface, the area of ​​the valve core is large, the load is large, and the specific pressure of the sealing surface is high.

At the same time, with the same flow area, the force on the spring is greater, which makes the valve core and spring more likely to be damaged, thus affecting the reliability and service life of the valve.

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