Track-torsion connecting bidirectional hard sealing butterfly valve

Abstract

The invention provides a track-torsion connecting bidirectional hard sealing butterfly valve, which resolves the problems that an existing track butterfly valve is long in starting time and a valve plate is prone to water leakage when beaten and pressed reversely and mainly comprises a valve body, a valve body inner valve plate and a rotary device for controlling rotation of a valve plate. The rotary device comprises a hand wheel, a screw and a nut matched with the screw rod. The butterfly valve is characterized in that the nut is fixed on a rotary sleeve of the valve body, a guide sleeve is positioned in the rotary sleeve and in threaded connected with the screw, the guide sleeve can only move up and down in the rotary sleeve, a spiral torsion track is arranged on the outer surface of a polish rod and the screw, one end of a shaft on the valve plate is in clearance fit with the torsion track on the polish rod of the screw through a guide shaft, and an upper shaft and a lower shaft of the valve plate are respectively in contact with an eccentric wheel on one side of a guide pin in the valve plate. The on-off sensitivity of the valve is improved, and sealing performance of the valve plate is improved.

Description

technical field [0001] The invention relates to a valve, in particular to a two-way hard-sealed butterfly valve with orbit twist connection. Background technique [0002] At present, the existing butterfly valves are generally driven by worm gears, and the upper and lower shafts and the valve plate are generally connected by taper pins or keys. The valve is opened and closed by the 90-degree rotation of the upper and lower shafts. This kind of butterfly valve inevitably has a long opening and closing time. At the same time, when opening and closing, the sealing surface has different degrees of friction, the sealing surface is easily damaged, and the service life is short. However, the existing orbital butterfly valve has a linear connection between the guide pin and the contact surface of the upper and lower shafts, the connection is unstable, there is a phenomenon of reverse pressure and water leakage, and it does not have the performance of bidirectional sealing. Conten...

AI Technical Summary

Problems solved by technology

This kind of butterfly valve inevitably has a long opening and closing time. At the same time, when opening and closing, the sealing surface has different degrees of friction, the sealing surface is easily damaged, and the service life is short.

However, the existing orbital butterfly valve has a linear connection between the guide pin and the contact surface of the upper and lower shafts, the connection is unstable, there is a phenomenon of reverse pressure and water leakage, and it does not have the performance of two-way sealing

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