Power-off driving device for gas cut-off valve

Abstract

The invention discloses a power-off driving device for a gas cut-off valve, belongs to accessories of gas valves, and in particular discloses a valve accessory for cutting off gas in emergency by electrically cutting off and manually recovering manner. The power-off driving device for the gas cut-off valve comprises a driving circuit and an electromagnetic coil power supply circuit; the driving circuit is that a capacitive and resistance voltage drop device is connected with a bridge type rectifier circuit and then sequentially connected with a first-stage triode amplifying circuit and a second-stage triode amplifying circuit; a relay coil is connected to a triode collecting electrode of the second-stage amplifying circuit; the electromagnetic coil power supply circuit is that one end connected with the output end of the AC bridge type rectifier circuit is grounded, and while the other end is grounded after passing through two electrolytic capacitors, a gas cut-off valve electromagnetic coil and a relay contact which are sequentially connected in parallel through diodes. With the adoption of the device, the requirement that the cut-off valve is in the closed state while power of can be achieved.

Description

technical field [0001] The invention belongs to a gas valve accessory, in particular to a valve accessory for emergency gas cut-off using electric cut-off and manual reset. Background technique [0002] In the gas pipeline network, in order to ensure safety, it is necessary to install some valves that cut off the gas pipeline in case of accidents or other safety hazards. The commonly used ZCRD series normally open gas emergency shut-off valve is a better one. The valve does not need electricity. Keep the valve normally open. However, when a sudden abnormal accident causes a power outage, the valve is still open, which poses a safety hazard and does not meet the requirements of the national standard GB50028--2006 "Code for Urban Gas Design" that "the gas inlet pipe should be equipped with a manual quick shut-off valve and an emergency automatic shut-off valve. : The emergency automatic shut-off valve must be in the closed state (normally open type) when the power is off." ...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiency that the existing emergency automatic cut-off valve cannot reach the closed state when the power is cut off, the present invention provides a power-off driving device for a gas cut-off valve, which can replace the existing ZCRD The series of normally open gas emergency shut-off valves meet the requirement that they must be in the closed state during power failure

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