A differential pressure unloading safety valve

Abstract

Provided is a differential pressure unloading safety valve, comprising a valve body (1), a valve core (2), and a valve spindle (3). The valve body (1) is provided with a liquid inlet hole (17), a first cavity (1a) and a second cavity (1b) are formed inside the valve body (1), and an elastic baffle ring (4) with a fluid guide hole is arranged between the first cavity (1a) and the second cavity (1b). The valve core (2) and the valve spindle (3) are arranged respectively in the first cavity (1a) and the second cavity (1b), the valve core (2) is connected to a valve core spring (5), and a valve spindle spring (6) is arranged at the periphery of the valve spindle (3). Employing the cooperation of the two springs, the differential pressure unloading safety valve features an optimal unloading effect and enlarges the space of a fluid return cavity. A first fluid outlet (7a) and a second fluid outlet (7b) are formed on the circumferential surface of the valve body (1), so that more hydraulic fluid can return within a same time period, improving the work efficiency, and enlarging the scope of application.

Description

technical field [0001] The invention belongs to the field of hydraulic cylinder unloading, in particular to a differential pressure unloading safety valve. Background technique [0002] At present, the oil return pressure regulating valve on the market includes a valve body, a valve sleeve, a valve needle and an oil inlet passage. There is a sealing sleeve between the front end and the valve body. The needle of the valve needle is in contact with the outlet at one end of the oil inlet passage. During the working process, hydraulic oil enters the oil inlet passage to generate pressure on the needle of the valve needle. When it is elastic, the return spring contracts, the valve needle drives the sealing sleeve to move backward, and the hydraulic oil enters the oil return chamber. When the sealing sleeve moves to the position behind the oil outlet, the hydraulic oil flows out from the oil outlet to complete the oil return. [0003] Although the above-mentioned pressure regulat...

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Problems solved by technology

[0004] 1. Due to the large elastic force of the return spring, in order to make it shrink during work, the hydraulic cylinder needs to be able to generate a large enough thrust, that is, the hydraulic cylinder has high requirements for work, and the scope of application is relatively limited. Generally, it can only be used in piston thrust. back into the oil and unloading is not possible

[0005] 2. Due to the high requirements on the hydraulic cylinder, the used return spring is large, resulting in a large structure of the pressure regulating valve, and high requirements on the manufacturing level of the product, which makes the corresponding cost large and not practical enough

[0006] 3. Due to the small setting of the oil return hole, it affects the oil return speed of the pressure regulating valve and reduces the working efficiency

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