Kelly bar plug valve and method

Abstract

The invention discloses a kelly bar plug valve and a method. According to the technical scheme, two sets of outer valve bodies, two sets of inner valve bodies, an upper valve seat, a lower valve seat,a spherical valve element, bearings and screws are included, arc-shaped guide rods are fixedly installed on the outer walls of the outer valve bodies, and the inner sides of the outer valve bodies abut against the inner valve bodies. First sealing rings are arranged between the outer valve bodies and the inner valve bodies, the inner side of the inner valve body at the upper end abuts against theupper valve seat, and the inner side of the inner valve body at the lower end abuts against the lower valve seat. The kelly bar plug valve and the method have the beneficial effects that by arranginga T-shaped hole, a communicating hole, a cock hole, a connecting hole and a pressure relief hole, before the valve is opened, a pressure relief knob is driven to rotate, so that the T-shaped hole, the communicating hole, the cock hole, the connecting hole and the pressure relief hole are in communication for pressure relief, accordingly the internal and external pressure intensity difference is reduced, the spherical valve element rotates more smoothly, a driving rod is arranged, a switch knob does not need to be screwed by using a wrench, and opening and closing of the valve are more convenient in a labor-saving manner.

Description

technical field [0001] The invention relates to the technical field of kelly cock valves, in particular to a kelly cock valve and a method thereof. Background technique [0002] The plug valve is a closing member or a plunger-shaped rotary valve. By rotating 90 degrees, the channel port on the valve plug communicates with or separates from the channel port on the valve body to realize opening or closing. The shape of its valve plug It can be cylindrical or conical. In the cylindrical valve plug, the channel is generally rectangular; in the conical valve plug, the channel is trapezoidal. These shapes make the structure of the plug valve light and suitable for cutting and connecting. It is suitable for passing medium and shunting, but according to the applicable properties and the erosion resistance of the sealing surface, sometimes it can also be used for throttling. The plug valve is a fast-switching straight-through valve. Because the movement between the sealing surfaces h...

AI Technical Summary

Problems solved by technology

[0004] In the existing kelly plug valve, in order to ensure the sealing effect, the contact area between the valve core, the valve body and the valve seat is very large. When the valve core receives huge pressure, it will take a lot of force to open the valve, and it may The spool is stuck; and the opening of the valve must use a wrench, which makes it particularly troublesome

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