Quick two-way stop valve

Abstract

The invention discloses a rapid double-direction stop valve. The rapid double-direction stop valve comprises a valve body, an end cover and a valve rod. The end cover is fixed to the upper portion of the valve body, a seal lip stretching into the valve body is arranged on the end cover, a valve plug for dividing the interior of the valve body into an upper gas chamber and a lower gas chamber is movably arranged in the valve body, a gas hole communicating the upper gas chamber with the lower gas chamber is formed in the valve plug, and the valve rod stretches into the valve body from the lower portion of the valve body to be fixedly connected with the valve plug; a first gas opening communicated with the upper gas chamber is formed in the valve body, and a second gas opening communicated with the upper gas chamber is formed in the end cover; and the valve plug and the seal lip are matched to control the first gas opening and the second gas opening to be on and off. When the stop valve is opened and closed, axial pressure borne by the valve plug is reduced, opening and closing of the stop valve can be rapidly achieved through small driving force, and the service life of the valve plug is prolonged.

Description

technical field [0001] The invention belongs to the field of air control engineering, and in particular relates to a fast two-way stop valve, which is suitable for connection control between various air chambers of vehicle air springs. Background technique [0002] To automatically control the on-off of pipelines connecting two containers with different pressures, electric, pneumatic or hydraulic pressure is almost always used as the power source to control the stop valve valve. Most of the time, the airflow direction is almost certain, that is The gas flows from the A container through the valve into the B container. Under such conditions, it is not difficult to realize the shut-off and good sealing of the valve. However, traditional gas valves generally use the axial displacement of the valve stem with the sealing ring to cooperate with the groove and sealing pair of the valve body to shut off the gas path, or use the end surface of the sealing body to cover the vent hole ...

AI Technical Summary

Problems solved by technology

Although the former can realize the sealing of two-way air flow in the pipeline, the sealing ring will be squeezed out when the valve is closed to open due to the excessive pressure difference between the inlet and exhaust ports, and generally can only withstand the pressure of not more than 2mpa after shutting off. Differential pressure, suitable for low pressure gas control

Although the end face sealing method can withstand high pressure, but because when the diameter increases, the driving force required to lift the valve stem to open the valve increases greatly, and at the same time, when the valve is closed, the valve stem bears the effect of gas pressure. The pressure on the sealing surface is very high, the requirements for the sealing body are very high, and the service life is not long

Due to the influence of the above factors, the pilot drive mode is generally adopted for the high and low pressure valves with large diameters, but the following is that the action time is relatively long.

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