Pressure safety valve

Abstract

The invention discloses a pressure safety valve. The safety valve comprises a valve body, wherein a first chamber is formed by a first one-way valve core and the front part of an inner hole of the valve body in a surrounding manner, a second chamber is formed by the first one-way valve core, the front end of a push rod and the inner hole of the valve body in a surrounding manner, third chambers are formed by the middle part of the push rod and the inner hole of the valve body in a surrounding manner, and a fourth chamber is formed by the back end of the push rod and the back part of the inner hole of the valve body in a surrounding manner; second oil holes are formed in the valve body and in positions corresponding to the first one-way valve core, third oil holes are formed in the valve body and in positions corresponding to the front part of the push rod, fourth oil holes are formed in the valve body and in positions corresponding to the third chambers, and a fifth oil hole is formed in the valve body and in a position corresponding to the fourth chamber; the second oil holes and the fourth oil holes are connected with an oil tank, the third oil holes are connected to a hydraulic system in parallel, and the fifth oil hole is an oil outlet; pressure maintenance structures which are used for maintaining the balanced pressure of the push rod are arranged in the third chambers and the fourth chamber. The safety valve disclosed by the invention can prevent pressure impact, prevent equipment from being damaged and improve the security of the equipment.

Description

technical field [0001] This invention relates to valves. Background technique [0002] At present, in the hydraulic system, when the pressure is too high or the pressure shock is solved, most of them use a pressure insurance relief valve to protect the system, or use a pressure relay and an electromagnetic unloading valve. [0003] In any case, when the system is subjected to a pressure shock and a fault occurs, the pressure will be re-established when the equipment is restarted before the fault is eliminated. At this time, the protection Components or employees are also at risk. [0004] The pressure relay plus electromagnetic unloading valve scheme is adopted. When the pressure exceeds the set value of the pressure relay, the relay is opened and connected, and the electromagnetic unloading valve is energized to release the pressure. However, this scheme has the above-mentioned defects, that is, when When the power of the equipment is restarted, the pressure will rise aga...

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Problems solved by technology

[0004] The pressure relay plus electromagnetic unloading valve scheme is adopted. When the pressure exceeds the set value of the pressure relay, the relay is opened and connected, and the electromagnetic unloading valve is energized to release the pressure. However, this scheme has the above-mentioned defects, that is, when When the power of the equipment is restarted, the pressure will rise again until it reaches the set pressure of the pressure switch before it can be unloaded again, and this solution is a multi-valve combination solution, which takes up more space during installation

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