Fluid-controlled ultra-high pressure two-way stop valve and method for fluid cut-off or communication

Abstract

The invention discloses a hydraulic control ultrahigh-pressure two-way stop valve for a fluid and a fluid stopping or communication method. The two-way stop valve comprises an oil control valve group and a liquid control valve group, wherein the oil control valve group comprises an oil control valve body, an oil cavity end cover, and an oil cavity piston arranged in the oil control valve body; the liquid control valve group comprises a liquid control valve body, a plug, as well as a middle piston arranged in the liquid control valve body, a conical piston fixedly connected to one end of the middle piston, and a valve sleeve; the conical piston is sleeved by the valve sleeve and adopts a conical structure which can be conically sealed with the inner step surface of the valve sleeve; a driving part capable of driving the middle piston to move axially is arranged at one end of the oil cavity piston; and an elastic reset element is arranged between the conical piston and the plug. By adoption of the two-way stop valve provided by the invention, the ultrahigh-pressure two-way fluid sealing and communication functions can be realized.

Description

technical field [0001] The invention relates to a hydraulically controlled ultra-high pressure two-way cut-off valve for fluid and a method for stopping or connecting the fluid, belonging to the field of hydraulic technology. Background technique [0002] In the hydraulic system, the general pressure exceeding 100MPa is called ultra-high pressure. In the existing hydraulic technology field, the ultra-high pressure seal adopts the cone seal, but generally it is a one-way valve, which cannot realize the two-way ultra-high pressure seal cut-off. There are certain limitations in some ultra-high pressure hydraulic systems with bi-directional cut-off requirements. [0003] Chinese patent application CN201310407065.3 discloses an ultra-high pressure and large flow pressurized hydraulic control stop valve, which includes a valve seat, a low-pressure valve body and an ultra-high pressure valve body, and the valve seat is sealed with one end of the low-pressure valve body The other e...

AI Technical Summary

Problems solved by technology

[0004] Defect 1: The liquid medium cut off and maintained by an ultra-high pressure and large flow pressurized hydraulic control stop valve must be consistent with the hydraulic medium of the control oil circuit, because when the piston rod seal ring fatigues and ages, the high pressure chamber and the low pressure chamber will be connected. As a result, the liquid media in the high and low pressure chambers are mixed. If the two media are different, they may contaminate each other;

[0005] Defect 2: An ultra-high pressure and large flow pressurized hydraulic control cut-off valve has high requirements on the hydraulic control check valve installed on the control oil circuit during the pressure maintenance process, and there is a failure of the hydraulic control check valve, which in turn leads to ultra-high pressure cut-off risk of failure

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