Bellows regulating valve

Abstract

The present invention discloses a bellows regulating valve, wherein a connecting pipe is provided between the valve body and the valve cover, and a valve core is installed in the valve body, wherein a bellows assembly is installed in the connecting pipe, the valve stem passes through the valve cover, and the bellows assembly is fixed to the valve core, and the bellows assembly comprises: an upper joint is fixed at one end of the bellows, and a lower joint is fixed at the other end of the bellows, the upper joint is placed in the upper pipe mouth of the connecting pipe; the lower joint is placed in the lower pipe mouth of the connecting pipe; the upper pipe mouth of the connecting pipe has a countersunk hole, and two semicircular support rings are relatively installed in the countersunk hole, and the two semicircular support rings embrace the upper joint. The present invention provides two semicircular support rings, and after disassembling the valve cover, the double semicircular support rings can be removed by pulling the valve stem, and then the connecting pipe, the valve core, and the valve stem can be removed in sequence to realize the removal operation of the bellows assembly. The structure of the present invention simplifies the steps of replacing the bellows assembly.

Description

Technical Field

[0001] The present invention relates to a regulating valve, in particular to a bellows regulating valve. Background Art

[0002] Among control valve types, a special type is the bellows control valve. This type of control valve is suitable for controlling highly toxic, precious, volatile, and radioactive media, and is also suitable for vacuum applications. The bellows assembly of the control valve is a consumable part and requires regular replacement.

[0003] The replacement process of the bellows assembly in the existing regulating valve technology is cumbersome, with long maintenance time, high replacement cost and poor economic efficiency.

[0004] Therefore, the present invention is dedicated to providing a regulating valve with a more convenient bellows replacement. Summary of the Invention

[0005] The above-mentioned object of the present invention is achieved through the following technical solutions:

[0006] A bellows regulating valve, with a connecting pipe between the valve body and the valve cover, and a valve core installed in the valve body, wherein a bellows assembly is installed in the connecting pipe, the valve stem passes through the valve cover, the bellows assembly is fixed to the valve core, and the bellows assembly includes: an upper joint is fixed at one end of the bellows, and a lower joint is fixed at the other end of the bellows, the upper joint is placed in the upper pipe mouth of the connecting pipe; the lower joint is placed in the lower pipe mouth of the connecting pipe; the upper pipe mouth of the connecting pipe has a countersunk hole, and two semicircular support rings are installed oppositely in the countersunk hole, and the two semicircular support rings embrace the upper joint.

[0007] The bellows regulating valve as described above, wherein the upper joint comprises: the lower portion of the upper tube is fixed to the bellows, the upper portion of the upper tube has an annular protrusion; and the two semicircular support rings embrace the upper tube.

[0008] In the bellows regulating valve as described above, a cylindrical pin is provided at the lower portion of the lower joint, and the valve core is threadedly connected to the cylindrical pin.

[0009] The bellows regulating valve as described above, wherein the lower joint has an external hexagonal shape, and the lower pipe opening of the connecting pipe is matched with an internal hexagonal shape.

[0010] To sum up, due to the adoption of the above-mentioned technical solution, the present invention solves the problem of difficulty in disassembling the bellows in the prior art. By setting two semicircular support rings, after removing the valve cover, the double semicircular support rings can be removed by pulling the valve stem, and then the connecting pipe, valve core, and valve stem can be removed in turn to realize the removal operation of the bellows assembly. The structure of the present invention simplifies the replacement steps of the bellows assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the bellows regulating valve of the present invention;

[0012] Figure 2 It is a partial enlarged view of the bellows of the bellows regulating valve of the present invention. DETAILED DESCRIPTION

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0014] Figure 1 This is a schematic diagram of the structure of the bellows regulating valve of the present invention. Figure 2 This is a partial enlarged view of the bellows of the bellows regulating valve of the present invention, see Figure 1 、 Figure 2 , a bellows 3 regulating valve, with a connecting pipe 4 between the valve body 10 and the valve cover, a valve core 7 is installed in the valve body 10, and a valve seat 9 is provided in the valve body 10, wherein a bellows 3 assembly is installed in the connecting pipe 4, the valve stem passes through the valve cover, the bellows 3 assembly and is fixed to the valve core 7, the bellows 3 assembly includes: an upper joint 1 is fixed at one end of the bellows 3, and a lower joint 5 is fixed at the other end of the bellows 3, the upper joint 1 is placed in the upper pipe mouth of the connecting pipe 4; the lower joint 5 is placed in the lower pipe mouth of the connecting pipe 4; the upper pipe mouth of the connecting pipe 4 has a countersunk hole, and two semicircular support rings 2 are relatively installed in the countersunk hole, and the two semicircular support rings 2 embrace the upper joint 1. Due to the presence of the valve cover, the two semicircular support rings 2 can fix the upper joint 1 to the upper part of the connecting pipe 4 after installation.

[0015] Specifically, the countersunk hole for placing the semicircular support ring 2 can be used as a deeper countersunk hole, and on this basis, a shallower countersunk hole can be opened to place the sealing ring.

[0016] The outer circles of the two semicircular support rings 2 of the present invention match with the deeper countersunk hole on the upper part of the inner cavity of the pipe, and the inner circles of the double semicircular support rings 2 match with the outer circle of the joint 1 on the bellows 3 assembly.

[0017] Specifically, the lower joint 5 of the bellows 3 is welded to the bellows 3, and the upper joint 1 of the bellows 3 is welded to the bellows 3. The entire bellows 3 assembly can pass through the inner cavity of the connecting pipe.

[0018] Specifically, the shape of the lower part of the inner cavity of the pipe is hexagonal, and the shape of the upper part of the inner cavity of the pipe is circular.

[0019] Furthermore, the upper joint 1 includes: the lower part of the upper tube is fixed to the bellows 3, the upper part of the upper tube has an annular protrusion; and two semicircular support rings 2 surround the upper tube.

[0020] Furthermore, a cylindrical pin 6 is provided at the lower portion of the lower joint 5 , and the valve core 7 is threadedly connected to the cylindrical pin 6 .

[0021] Furthermore, the lower joint 5 has an outer hexagonal shape, and the lower pipe opening of the connecting pipe 4 is matched with an inner hexagonal shape.

[0022] In the specific implementation process of the present invention, the simplified replacement process of the bellows 3 assembly is as follows:

[0023] 1. First remove the parts above the pipe assembly;

[0024] 2. Stretch the valve stem until the double semicircular support ring 2 can be removed;

[0025] 3. Take out the double semicircular support ring 2;

[0026] 4. Lift the pipe upwards and remove it;

[0027] 5. Lift the valve stem upwards and remove the valve core 7 from the sleeve 8, along with the bellows 3 assembly and the valve stem.

[0028] 6. Remove the cylindrical pin 6 connecting the valve core 7 and the bellows 3 assembly, and unscrew the valve core 7 from the bellows 3 assembly;

[0029] 7. Unscrew the valve stem from the inside of the bellows 3.

[0030] The technology of the present invention can simplify the replacement process of the bellows 3 component.

[0031] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without requiring creative effort or software programming. Therefore, any technical solution that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A bellows regulating valve, with a connecting pipe between the valve body and the valve cover, and a valve core installed in the valve body, characterized in that: A bellows assembly is installed in the connecting pipe, the valve stem passes through the valve cover, and the bellows assembly is fixed to the valve core. The bellows assembly includes: an upper joint is fixed to one end of the bellows, and a lower joint is fixed to the other end of the bellows, the upper joint is placed in the upper pipe opening of the connecting pipe; the lower joint is placed in the lower pipe opening of the connecting pipe; a deep countersunk hole is provided on the upper pipe opening of the connecting pipe, two semicircular support rings are installed oppositely in the deep countersunk hole, a shallow countersunk hole is provided on the upper pipe opening of the connecting pipe, and a sealing ring is placed therein, and the two semicircular support rings surround the upper joint; The lower portion of the upper tube is fixed to the corrugated tube, and the upper portion of the upper tube has an annular protrusion; the two semicircular support rings embrace the upper tube; The lower joint has an external hexagonal shape, and the lower pipe opening of the connecting pipe is matched with an internal hexagonal shape; A cylindrical pin is provided at the lower portion of the lower joint, and the valve core is threadedly connected to the cylindrical pin.

Images