Hydraulically controlled manually released normal open valve

Abstract

The invention provides a Hydraulically controlled manually released normal open valve, and belongs to the technical field of hydraulic valves. The hydraulically controlled manually released normal open valve solves the problem of poor using effect and practicality as an arm is easy to become numb in a long-term exerting state of an existing normal open valve. The hydraulically controlled manuallyreleased normal open valve comprises a valve body, a valve seat, a valve deck and a valve element, wherein a through cavity structure and a through hole are formed in the center in the valve element,the cavity structure and the through hole are located on the same axis and communicate with each other, and a reset spring is arranged in the cavity structure; two ends of the reset spring abut against an inner step of the cavity structure and an oil outlet in the valve body separately, at least one hydraulic flow channel is formed in the side wall of the valve element in the axial direction, a pilot valve needle is arranged in the valve seat in the axial direction, the end of the pilot valve needle is matched with the through hole in the valve element, and the diameter of the pilot valve needle is larger than that of the through hole. The hydraulically controlled manually released normal open valve has the advantages that the hydraulically controlled manually released normal open valve ismore reasonable in overall structural design, a self-locking effect is achieved by applying a hydraulic pressure, and the flow channel can be controlled to be cut off only through a slight thrust.

Description

technical field [0001] The invention belongs to the technical field of hydraulic valves, and relates to a normally open valve, in particular to a hydraulically controlled manual release normally open valve. Background technique [0002] The application of the release valve in the hydraulic field includes normally open valve and normally closed valve. In the conduction state, it is cut off by external force. At present, the most widely used valve in the market is the normally closed valve, but in some special fields, the normally open valve is required, such as the hydraulic control on the elevator, and the hydraulic oil can be used in emergency situations. The cutoff cutoff is used to prevent safety hazards. [0003] In the existing technology, normally open valves are divided into two types: manual control and electromagnetic control. The electromagnetic control has the following problems, the structure is relatively complex, the manufacturing cost is high, and the reliabi...

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Problems solved by technology

[0003] In the existing technology, normally open valves are divided into two types: manual control and electromagnetic control. The electromagnetic control has the following problems, the structure is relatively complex, the manufacturing cost is high, and the reliability is low, that is, the magnetic field strength is insufficient due to unstable current or the circuit is aging and cannot generate a magnetic field. etc. will cause the spool to be unable to effectively cut off in an emergency state. In the existing manual control, due to the high pressure generated by the hydraulic flow channel, the manual normally open valve needs to be pushed all the time to make the hydraulic pressure cut off. Large anti-thrust, when the arm is prone to numbness under long-term exertion, the use effect and practicability are poor

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