Stop valve capable of relieving pressure

Abstract

The invention provides a stop valve capable of relieving pressure. The stop valve comprises a valve body, a valve flap, a valve rod, a valve cover and a handle, wherein a filler is arranged between the valve cover and the valve rod, seal washers are arranged at the upper portion and the lower portion of the filler respectively, a valve seat is provided with a pressure relief hole, the pressure relief hole is provided with a pressure relief block, and a retaining frame is arranged on the valve seat and right faces the pressure relief block. The stop valve has the advantages that the filler is used between the valve cover and the valve rod, and the seal washers are arranged at the upper portion and the lower portion of the filler respectively so that the friction between the valve rod and the valve body can be reduced, and meanwhile the sealing performance between the valve rod and the valve cover can be improved; the pressure relief hole is formed in the valve seat and is plugged with the pressure relief block, so that the pressure relief hole is opened when the pressure in a pipeline is too large, a medium is discharged towards the lower portion of the pipeline through the pressurerelief hole, the retaining frame can prevent the pressure relief block from entering the pipeline, and the phenomenon is effectively prevented that the medium is leaked to the outside to pollute theenvironment due to too large pressure.

Description

technical field [0001] The invention belongs to the field of pipeline control equipment, in particular to a cut-off valve capable of pressure relief. Background technique [0002] Globe valve refers to the valve in which the closing part (disc) moves along the centerline of the valve seat, and the valve disc moves linearly along the centerline of the valve seat. Since the opening or closing stroke of the valve stem of this type of valve is relatively short, and it has very reliable The cut-off function of the valve seat, and because the change of the valve seat port is proportional to the stroke of the valve disc, it is very suitable for the adjustment of the flow rate. Therefore, this type of cut-off valve is very suitable for cutting or regulating and throttling. Once the stop valve is in the open state, there is no contact between its valve seat and the sealing surface of the valve disc. When it is closed, it has a very reliable cutting action, so its sealing surface has ...

AI Technical Summary

Problems solved by technology

When the existing stop valve seals the packing, generally only a layer of packing cap is added on the packing, and its sealing performance is not high, and it is prone to leakage after being used for a period of time

In addition, when the pressure of the pipeline where the stop valve is located is too high, if the pressure relief valve is not installed or the pressure relief valve does not work normally, it will cause damage to the pipeline components, the medium will be discharged to the outside, and the environment will be polluted.

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