Electro-hydraulic multi-speed cushion valve capable of being used for near-water medium

Abstract

The invention provides an electro-hydraulic multi-speed cushion valve capable of being used for near-water media. The electro-hydraulic multi-speed cushion valve comprises a main valve body, a main runner arranged in the main valve body, a thin runner arranged in the main valve body and an electromagnetic pilot valve; the main runner comprises a liquid inlet runner, a liquid outlet runner and a communication cavity communicating between the liquid inlet runner and the liquid outlet runner; a stop valve assembly is arranged in the communication cavity, and the stop valve assembly is a hydrauliccontrol one-way valve string; the two ends of the thin runner are in communication with the liquid inlet runner and the liquid outlet runner correspondingly; and the liquid inlet runner is further communicated with a control oil inlet of the electromagnetic pilot valve, a first control oil outlet of the electromagnetic pilot valve is in communication with a hydraulic control port of the hydrauliccontrol one-way valve string, the hydraulic control one-way valve string is in a normally-closed state when the electromagnetic pilot valve is in an open state, and the hydraulic control one-way valve string is in a normally-open state when the electromagnetic pilot valve is in a closed state. The electro-hydraulic multi-speed cushion valve capable of being used for the near-water medium has theadvantages of being scientific in design, adjustable in flow, high in control precision and capable of prolonging the service life.

Description

technical field [0001] The invention relates to a valve, in particular to an electro-hydraulic multi-speed buffer valve which can be used in near-water media. Background technique [0002] Due to the special requirements for safety and stability in coal mining, ordinary valves cannot be used to adjust flow in the underground environment. Hydraulic valves are a type of valve commonly used in underground hydraulic systems. Traditional hydraulic valves cannot be combined with electro-hydraulic. The flow is automatically controlled. Most of the hydraulic control valves can only control the two states of fully open or fully closed, and cannot change the flow in the hydraulic system circuit. This leads to the fact that in the traditional downhole hydraulic circuit, the actuator cylinder can only maintain the same inflow and outflow flow during the whole process of operation. This control method mainly has the following defects: (1) The starting pressure is very high in the initial...

AI Technical Summary

Problems solved by technology

[0002] Due to the special requirements for safety and stability in coal mining, ordinary valves cannot be used to adjust flow in the underground environment. Hydraulic valves are a type of valve commonly used in underground hydraulic systems. Traditional hydraulic valves cannot be combined with electro-hydraulic. The flow is automatically controlled. Most of the hydraulic control valves can only control the two states of fully open or fully closed, and cannot change the flow in the hydraulic system circuit.

This leads to the fact that in the traditional downhole hydraulic circuit, the actuator cylinder can only maintain the same inflow and outflow flow during the whole process of operation. This control method mainly has the following defects: (1) The starting pressure is very high in the initial stage of the cylinder execution. Even greater than the pressure of the pump station, the flow rate of the driving fluid is large, and it will impact the actuator for a long time, which will easily lead to the failure of the cylinder joint seat and the fracture of the shear pin; The action control of the mechanism is not precise enough; at the same time, the service life of hydraulic pipeline components will also be affected, which is not energy-saving and environmentally friendly, and wastes effective resources

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