Swing axial-flow safety shut-off valve for natural gas

Abstract

The invention relates to a swing axial-flow safety shut-off valve for natural gas. The shut-off valve comprises a hand wheel, a valve seat, a planar volute spring, a sealed turning plate, a rotating shaft of the sealed turning plate, and a safety shut-off valve director, wherein the sealed turning plate and the rotating shaft of the sealed turning plate are arranged on a valve body. The swing axial flow safe shut-off valve is characterized in that the sealed turning plate comprises a sealed turning plate connecting plate, a buffer spring, a connecting bolt for the sealed turning plate, a buffer spring seat and a connecting base plate, wherein the sealed turning plate is connected with the connecting base plate through a bolt, a threaded hole is formed in the centre of the connecting base plate and is connected with the sealed turning plate connecting bolt, and the sealed turning plate connecting bolt is in a stepped shaft shape; the left end of the sealed turning plate connecting bolt is connected with the buffer spring seat, the buffer spring is sleeved on the buffer spring seat, and the sealed turning plate is connected with the sealed turning plate connecting plate through the sealed turning plate connecting bolt. The swing axial-flow safety shut-off valve has the beneficial effects of integrating overpressure, underpressure, manual operation and long-distance control function together, and realizing four control effects by respectively trigging the different displacement directions of a runner.

Description

technical field [0001] The invention belongs to valves, in particular to a natural gas swing type axial flow safety cut-off valve. Background technique [0002] The pressure control system of the natural gas transmission station is mainly composed of a safety shut-off valve, a monitoring pressure regulating valve and a working regulating valve. The valve body of the safety shut-off valve is connected to the pipeline in front of the monitoring pressure regulating valve through a flange. (Pilot valve) is connected to the pipeline behind the working pressure regulating valve through the pressure signal conduit, receives the downstream feedback control pressure, controls the switch of the safety cut-off valve, controls the downstream pressure within the set range, and ensures the normal downstream pipeline supply. Gas pressure and safe delivery of gas. At present, the control pilots of the cut-off mechanism of the safety shut-off valve mostly adopt a single-function over-pressu...

AI Technical Summary

Problems solved by technology

At present, the control pilots of the cut-off mechanism of the safety shut-off valve mostly adopt a single-function over-pressure cut-off or under-pressure cut-off, or the design of remote control and manual local control, lacking the design of the above four functions unified in one valve; currently used in the market The swing-type safety cut-off valve, the swing-open handwheel is mostly fixedly connected with the handwheel shaft and cannot be disengaged. When the force is insufficient or the hand slips, the handwheel will reverse instantaneously faster than the human reaction time, causing injury. At the same time, the sealing flap of the swing valve seat and the connecting rod of the sealing flap are mostly rigidly fixedly connected, without buffering, shock absorption and self-aligning functions, which greatly shortens the life of the sealing flap, valve seat and sealing ring , the reliability is reduced; the pre-tightening sealing force required by the valve port is transmitted to the sealing flap through a single torsion spring, the pre-tightening force is small and the installation is difficult, and it is easy to leak at low pressure

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