Valve with double corrugated pipes

Abstract

The invention relates to a valve with double corrugated pipes. The valve comprises a valve body, a valve seat, a valve bonnet, a gate and a valve stem. The valve body is fixed to the valve bonnet, the valve body and the valve bonnet are provided with cavities and are communicated with each other, the valve seat is arranged in the valve body, the valve stem penetrates the valve bonnet, and the gate which is connected with the lower end of the valve stem is positioned in the valve seat and is matched with the valve seat. The valve is characterized by further comprising a lower corrugated pipe seat, an inner corrugated pipe assembly and an outer corrugated pipe assembly, the inner corrugated pipe assembly is sleeved on the outside of the valve stem, and the outer corrugated pipe assembly is sleeved on the outside of the inner corrugated pipe assembly; the inner corrugated pipe assembly comprises an inner spacer ring, an inner corrugated pipe and an inner upper corrugated pipe seat, and the inner corrugated pipe is divided into an inner upper corrugated pipe and an inner lower corrugated pipe; the outer corrugated pipe assembly comprises an outer spacer ring, an outer corrugated pipe and an outer upper corrugated pipe seat, and the outer corrugated pipe is divided into an outer upper corrugated pipe and an outer lower corrugated pipe. The valve with the double corrugated pipes has the advantages that the valve is simple in structure, reasonable in design and good in sealing effect and is not easy to deform, and the corrugated pipes are good in telescoping effect.

Description

technical field [0001] The invention relates to a valve, in particular to a double bellows valve, which is mainly suitable for valve stem sealing and occasions requiring high vacuum. Background technique [0002] Most of the bellows valves in the prior art are single bellows valves, the bellows has limited expansion and contraction effect, and the expansion and contraction effect is likely to fail because the bellows exceeds the safety factor range, resulting in damage to the valve and potential safety hazards. [0003] The Chinese patent publication number is 101893130A, which discloses an invention patent named "a bellows seal assembly and a bellows valve with the bellows seal assembly", which includes a bellows seal assembly, which includes The main purpose of the inner bellows, outer bellows, hollow upper bellows seat, hollow No. 1 lower bellows seat and hollow No. 2 lower bellows seat is to shorten the length of the valve stem and the length of the valve switch stroke. ...

AI Technical Summary

Problems solved by technology

[0002] Most of the bellows valves in the prior art are single bellows valves, the bellows have limited expansion and contraction effect, and the expansion and contraction effect is likely to fail because the bellows exceeds the safety factor range, resulting in damage to the valve and potential safety hazards

[0003] The Chinese patent publication number is 101893130A, which discloses an invention patent named "a bellows seal assembly and a bellows valve with the bellows seal assembly", which includes a bellows seal assembly, which includes The main purpose of the inner bellows, outer bellows, hollow upper bellows seat, hollow No. 1 lower bellows seat and hollow No. 2 lower bellows seat is to shorten the length of the valve stem and the length of the valve switch stroke. It cannot prevent the problem of twisting and deformation of the bellows after being compressed for a long time, nor does it take into account that one of the two bellows is stretched while the other is compressed without setting a limit, so that the bellows are infinitely compressed or stretched, causing the bellows to exceed the safety factor range, causing the bellows to fail in expansion and contraction, so it has the above defects

The main purpose is to reduce the space occupied by the valve stem, but there is no spacer ring in the middle of the bellows, which cannot meet the supporting strength of the bellows, and it is easy to cause the bellows to be twisted and deformed during compression, so it has the above disadvantages

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