Automatic-reset bypass valve

Abstract

The invention relates to a novel reset bypass valve. The novel reset bypass valve comprises an upper valve body, a reset wrench, an ejection cap, a guide sleeve, an ejector rod, a valve body, a spring and a steel ball, and is characterized in that the spring is installed in a groove in the bottom of the valve body, and the steel ball is arranged on the spring and is in contact with an O-shaped sealing ring below the guide sleeve for sealing; and the upper valve body and the valve body are fastened through screws, and the ejector rod, the election cap and the reset wrench are installed in the valve body. When the novel reset bypass valve works, the reset wrench and the ejector rod are pressed down, the steel ball is pressed down to be separated from the O-shaped sealing ring, and gas enters a downstream portion; and on the contrary, the steel ball and the O-shaped sealing ring are tightly pressed through the force of the spring, and sealing is achieved. The novel reset bypass valve has the beneficial effects that when the reset wrench is pressed down to enable the steel ball to be separated from the O-shaped sealing ring, gas passes through the bypass valve; when the reset wrench is released, the steel ball is pushed to the original position by the spring, the steel ball and the O-shaped sealing ring are attached for sealing, gas flow is blocked, and the automatic reset function is achieved; and the possibility that as an operator forgets to close the bypass valve, gas continues to flow towards the downstream portion is avoided, and potential safety hazards of operation are reduced.

Description

technical field [0001] The invention relates to a bypass valve, in particular to an automatic reset bypass valve for a safety cut-off valve. Background technique [0002] When the safety shut-off valve is closed, the upstream pressure of the valve will be greater than the downstream pressure, and the pressure acts on the flap of the safety shut-off valve, making the valve unable to open. At this time, the pressure difference between the front and rear chambers of the safety shut-off valve must be reduced to zero, so that The pressure in the chamber must be consistent to open the valve. At present, a bypass pipe is connected to the outside of the safety cut-off valve body, and a switch ball valve is installed to control and balance the pressure difference between the front and rear chambers. When the switch ball valve is opened, the pressure in the front and rear chambers is balanced, and the safety cut-off valve can be opened normally. The disadvantage is: when the operator...

AI Technical Summary

Problems solved by technology

After the valve is opened, the operator also needs to close the ball valve in time, otherwise, when the safety shut-off valve is cut off in an emergency, the gas can still flow to the downstream through the switch ball valve, causing the safety shut-off valve to lose the actual function of cutting off the gas source

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