Steam extraction check valve facilitating on-line maintenance

Abstract

The invention discloses a steam extraction check valve facilitating on-line maintenance. The steam extraction check valve comprises a valve body, a valve seat, a rocker arm, a valve clack and a valvedeck, wherein the valve seat, the rocker arm and the valve clack are arranged in the valve body. Any side of the valve body is provided with a pneumatic operating mechanism. The pneumatic operating mechanism is linked with the rocker arm through a valve rod in a matched manner. One end of the rocker arm partly extends to the outer side to form a step. The end, matched with the rocker arm, of the valve rod is provided with a protrusion. The protrusion is in face contact with a non-step position of the rocker arm and can slide relative to the non-step position. The protrusion is provided with afirst position and a second position, wherein the first position rotates anticlockwise and abuts against one side of the step of the rocker arm, and the second position rotates clockwise and abuts against the other side of the step of the rocker arm. The valve rod is directly linked with the rocker arm in the matched manner, so that a shaft only plays a support role; fixed connection between the shaft and the rocker arm is omitted; when on-line maintenance is conducted, parts such as the rocker arm and the valve clack can be dismounted for maintenance; and maintenance of all parts except the valve body is achieved.

Description

technical field [0001] The invention relates to the field of valves, in particular to a steam extraction check valve which is convenient for online maintenance. Background technique [0002] The steam extraction check valve is used in the water, steam and other media pipelines of the steam extraction system of the power plant or other systems to prevent the pressure in the steam turbine from suddenly dropping due to the load of the steam turbine, and the steam in the steam extraction pipe and each heater flows back into the steam turbine and causes steam failure. The blades of the wheel are broken and the vicious accident that destroys the steam turbine generator is prevented, and the heater system pipeline is prevented from leaking, so that when the water level of the feed water heater is too high, the pneumatic device components are quickly separated from the steam turbine after receiving the gas reverse flow signal, and the water supply Turbine or extraction system with m...

AI Technical Summary

Problems solved by technology

[0003] And the rocking arm of existing air extraction check valve all is fixedly arranged with the rotating shaft, and the driving parts such as pneumatic device all utilizes its driving rod or valve stem and the rotating shaft linkage cooperation, drives the rocking arm to rotate, and because rotating shaft and rocking arm It is fixedly connected. When disassembling online, the rocker arm, valve disc and shaft cannot be disassembled. Only the shaft sleeve and pneumatic device can be disassembled and replaced. For internal valve discs, rocker arms and other structures, it is not easy to replace them.

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