Double-sealing structure of piston type axial flow valve

Abstract

The invention provides a double-sealing structure of a piston type axial flow valve, which comprises a valve body, a piston, a secondary sealing socket and a guide sleeve serving as a primary sealing socket, wherein the piston is capable of moving in the valve body reciprocally; the secondary sealing socket and the guide sleeve are arranged on the valve body corresponding to the top end and tail end of the piston respectively; a secondary sealing ring which is made of rubber is connected with the secondary sealing socket of the valve body, and the end face of the top end of the piston is provided with a boss, and the boss and the secondary sealing ring form a seal pair; the end face of the tail end of the piston forms a 45-degree angle with the longitudinal axis of the piston, a primary sealing ring is fixed on the 45-degree face of the piston, the end face of the guide sleeve is also a 45-degree face, and the end face of the guide sleeve and the end face of the tail end of the piston form a primary seal pair; and the primary sealing ring is made of rubber, and clad layers are formed on the 45-degree end face of the piston and the 45-degree end face of the guide sleeve respectively. The double-sealing structure is reliable in sealing and long in service life.

Description

technical field [0001] The invention relates to a piston type axial flow valve, in particular to a double sealing structure of the piston type axial flow valve. Background technique [0002] Piston-type axial flow valve is a valve with a complete axial symmetry structure. All positions where the fluid flows through are circular flow cross-sections, so the flow state is relatively uniform. In the piping system of the specification, the application range is wide and the field is wide; especially the structural characteristics of the piston axial flow valve make this valve suitable for the working conditions of large flow and high pressure difference, which is incomparable and unique to other types of valves. It also enables the control of some extreme working conditions to be realized. The double-seal valve structure is often used in piston axial flow valves, which can realize the sealing of large, medium and small-diameter valves. However, there are still aspects to be impro...

AI Technical Summary

Problems solved by technology

The double-seal valve structure is often used in piston axial flow valves, which can realize the sealing of large, medium and small-diameter valves. However, there are still aspects to be improved in the current double-seal valve structure. For example, the existing double-seal valve structure generally Both use rubber sealing rings, because rubber can be compressed, on the one hand, as a sealing ring, it is easier to achieve the purpose of sealing than metal, but also because of its easy compression characteristics, it is easy to come out under the washing of medium force, so that the valve loses its sealing Effect

In addition, the secondary seal of the existing double-seal valve structure adopts the radial seal of the O-ring. Due to the friction during the movement of the piston, the O-ring wears quickly and leaks

Furthermore, when the existing double-sealed valve structure is maintained, if the valve is not disassembled, the O-ring cannot be replaced.

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