a valve

Abstract

The invention relates to a valve which comprises a valve body and a valve element. A first flow channel and a second flow channel which communicate with each other are arranged in the valve body. The cross sectional area of the first flow channel is larger than that of the second flow channel. The valve element comprises a head and a valve rod located in the first flow channel. A plug-in component detachably connected with the valve body is arranged at the combined position of the first flow channel and the second flow channel and provided with a through hole for allowing fluid to pass therein. The cross sectional area of the through hole is smaller than that of the second flow channel. When the valve element does reciprocating motion in the longitudinal direction, connection and disconnection of the first flow channel and the second flow channel can be achieved through opening and closing of the through hole and the head. The matching area of the valve body can be effectively protected through the plug-in component, only the plug-in component needs to be replaced when the plug-in component is damaged under the erosion action of fluid media and impurities in the fluid media, and the maintenance cost of a fluid transmission system is remarkably reduced. When the plug-in component needs to be disassembled, the plug-in component can be ejected out only by ejecting the end face, located in the second flow channel, of the plug-in component through an ejection tool, and disassembly and assembly are convenient.

Description

technical field [0001] The invention relates to the field of fluid transmission, in particular to a valve. Background technique [0002] Fluid transmission system is widely used in military, aerospace, civil and other fields, and its main transmission media are air, hydraulic oil, emulsion, pure water, etc. In the fluid transmission system, when the medium is transmitted in the pipeline, it is necessary to rely on the valve to control the transmission direction, flow and pressure of the fluid. The valve usually includes a valve core and a valve body with a flow channel inside. The flow channel contains an area where the cross section of the flow channel changes, and the head of the valve core is set near this area. The reciprocating movement of the valve core along its longitudinal direction changes the gap between the head of the valve core and the flow channel wall in this area, so that the fluid flow through this area changes. The flow channel wall where the above-menti...

AI Technical Summary

Problems solved by technology

However, since the outer cone valve seat and the inner cone valve seat are sealed through taper, the sealing effect needs to be guaranteed by other measures, such as the sealing ring disclosed in this patent document, thus increasing the number of sealing elements and improving the sealing effect. Cone valve installation difficulty

In addition, the inner cone valve seat is ejected by the ejector device through the top screw hole, so the distance between the inner surface of the inner cone valve seat and the center line of the inner cone valve seat cannot be less than the distance between the top screw hole and the center, which is for the inner cone valve seat. The diameter of the flow passage in the valve seat creates a certain restriction

[0007] In addition, in the patent documents disclosed above, when the valve body is worn out and cannot be used normally, it needs to be replaced with a valve body of the same type as the original valve body. When there are many different types of valves in the transmission system, it is necessary to stock various Different types of valve bodies, thus increasing the type and quantity of spare parts

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