Valve seat structure with adjustable pretension

Abstract

The invention discloses a valve seat structure with adjustable pretension, which comprises a valve core, a valve body and a valve seat which is arranged on the valve body and is matched with the valve core in a sealing way, wherein the valve body is fixedly provided with a ring-shaped press plate, the edge of the inner side of the ring-shaped press plate is fixedly provided with a supporting plate which is matched with the lower edge of the outer side of the valve seat in a sliding way, a gap which is used for pressure medium to enter a sliding cavity so as to press the ring-shaped press plate is arranged between the lower edge of the outer side of the valve seat and the supporting plate of the ring-shaped press plate, a spring hole is arranged inside an outer side end of the valve seat, a spring is arranged inside the spring hole, the ring-shaped press plate is provided with a screw hole, an adjusting screw is arranged inside the screw hole, the inner end of the adjusting screw is matched with a blind hole end of a positioning washer, the adjusting screw is matched with the outer end of the spring in a pushing way through the positioning washer, and the outer end of the adjusting screw is provided with a locking nut which is matched with the adjusting screw. The valve seat structure with the adjustable pretension has advantages that: the valve core is convenient to assemble, the abrasion of the valve seat can be effectively reduced, and the service life of a valve can be prolonged.

Description

technical field [0001] The invention relates to a valve seat structure, in particular to a valve seat structure with adjustable pretightening force, which can be applied to fields such as eccentric hemispherical valves. Background technique [0002] The sealing fit of existing ball valves or eccentric hemispherical valves is generally realized by the hard seal between the valve core and the valve seat. In order to achieve the inlet seal of existing ball valves or eccentric hemispherical valves, the sealing surface of the valve seat and the sealing surface of the valve core are usually required to be in close contact, such as figure 1 Shown is a traditional valve seat structure, mainly including valve body 1', screw 2', pressure plate 3', spring 4', valve seat 5', sealing ring 6', adjusting gasket 7', valve core 8 '; the valve seat is installed at the inlet of the valve body, and is limited by the valve body, the valve seat is fixed on the valve body by springs, pressure pla...

AI Technical Summary

Problems solved by technology

However, because the pretightening force of the valve seat cannot be adjusted, it has caused difficulties in assembly and pressure testing. Generally, it needs to be repeatedly disassembled and assembled and adjusted several times before it can be qualified.

The valve assembly of this structure is labor-intensive and time-consuming, and the pre-tightening force is too large. The greater the pre-tightening force, the more serious the wear and the shorter the service life.

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