CN212718206U

CN212718206U - Cryogenic axial flow check valve with online maintenance function

Info

Publication number: CN212718206U
Application number: CN202020946548.6U
Authority: CN
Inventors: 张清双; 吴春豪; 张静; 贾琦月
Original assignee: Jiangsu Shentong Valve Co Ltd
Current assignee: Jiangsu Shentong Valve Co Ltd
Priority date: 2020-05-29
Filing date: 2020-05-29
Publication date: 2021-03-16
Anticipated expiration: 2030-05-29

Abstract

A cryogenic axial-flow check valve with on-line maintenance function includes a valve body, a valve seat, a guide sleeve, a valve cover and a valve disc. There are two support ribs inside the valve body, three support grooves corresponding to the support ribs are arranged on the guide sleeve, and an anti-rotation block fixed with screws II and the guide sleeve is arranged in the guide sleeve support groove. There is a guide frame, the head and tail of the guide frame are provided with bearings, a spring is arranged between the guide frame and the valve disc, the spring is installed in the limit hole of the guide frame and the valve disc, and the valve disc and the guide sleeve are provided with convex Ribs, the raised ribs are provided with corresponding pin shaft holes, the tail of the guide sleeve is provided with a guide cone, the valve seat and the valve body are provided with a metal winding gasket and a flood plug, and the valve body and the valve cover are provided with a winding gasket piece. The beneficial effect of the utility model is that the on-line maintenance function can be realized through the design of the top-mounted valve cover.

Description

Cryogenic axial flow check valve with online maintenance function

Technical Field

The utility model relates to a check valve, especially a cryrogenic axial-flow type check valve with online maintenance function.

Background

In the LNG receiving station, the cryogenic axial flow type check valve is used for conveying an outlet of an pump and an outlet of a compressor unit of the LNG, and plays a role in preventing media from flowing backwards. The deep cooling axial flow check valve adopts butt welding connection mode according to the requirement of a receiving station, after a general axial flow check valve is welded on a pipeline, when a valve breaks down (acts unsmooth, sealing failure and the like) and needs to be overhauled, the valve can only be integrally cut out for maintenance, because the valve is cut, the structural length can be shortened, after maintenance, the valve needs to be subjected to surfacing welding at two ends of the valve and processed into corresponding groove envelope lines to be welded on the pipeline again, and the requirement of online maintenance function cannot be met.

SUMMERY OF THE UTILITY MODEL

In order to overcome the prior art problem, the utility model provides a cryrogenic axial-flow type check valve with online maintenance function.

The technical proposal of the utility model is that the cryogenic axial flow check valve with the online maintenance function comprises a valve body, a valve seat, a flow guide sleeve, a valve cover and a valve clack, wherein the valve cover is a top-mounted valve cover, the valve cover is provided with a support rib, the valve body is internally provided with two support ribs, the flow guide sleeve is provided with support grooves corresponding to three support ribs, the support groove of the flow guide sleeve is internally provided with an anti-rotation block fixed with the flow guide sleeve by a screw II, the inside of the flow guide sleeve is provided with a guide frame, the head part and the tail part of the guide frame are provided with bearings, a spring is arranged between the guide frame and the valve clack, the spring is arranged in a limit hole between the guide frame and the valve clack, the valve clack and the flow guide sleeve are provided with convex ribs, the convex ribs are provided with corresponding pin shaft holes, the tail part of the flow guide sleeve is provided with, and the connection is fixed through a fastener.

Furthermore, the three support ribs are uniformly distributed, and the angle between every two support ribs is 120 degrees.

Further, the flooding plug is a back-to-back flooding plug.

The utility model has the advantages that:

the online maintenance function can be realized through the design of the upper-mounted valve cover;

the guide sleeve is designed into a single part and is arranged on the supporting rib inside the valve body, so that the detachable function is realized. The axial direction of the flow guide sleeve is limited by the valve body and the support rib on the valve cover, and an anti-rotation block is arranged in the support groove of the flow guide sleeve to limit the flow guide sleeve to rotate under the action of a medium;

the valve clack and the flow guide sleeve are provided with protruding ribs which are provided with corresponding pin shaft holes, the spring is tightened by a nut, so that the valve clack and the flow guide sleeve are fixed at a certain position and then taken out;

the valve seat is designed into a double-sealing structure of a metal winding pad and a flooding plug, so that the sealing is more reliable.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is a perspective view of the rotation prevention block;

FIG. 4 is a perspective view of two support ribs inside the valve body;

FIG. 5 is a schematic view of a sealing structure between a valve body and a valve seat;

FIG. 6 is a side view of the valve cover;

fig. 7 is a schematic sectional view of three support ribs.

In the figure: 1. a valve body; 2. a flow guide cone 2; 3. a flow guide sleeve; 4. a guide shaft; 5. a guide frame; 6. a spring; 7, a bearing; 8. a valve flap; 9. a valve seat retainer; 10. a screw I; 11. a valve seat; 12. a metal wound gasket; 13. flooding and plugging; 14 winding the gasket; 15 a fastener; 16. a valve cover; 17, a pin shaft; 18. a nut; 19. a rotation prevention block; 20. and a screw II.

Detailed Description

As shown in the figure, the cryogenic axial flow check valve with the online maintenance function comprises a valve body 1, a valve seat 11, a flow guide sleeve 3, a valve cover 16 and a valve clack 8, wherein the valve cover 16 is an upper-mounted valve cover, a support rib is arranged on the valve cover 16, two support ribs are arranged inside the valve body 1, three support grooves corresponding to the three support ribs are arranged on the flow guide sleeve 3, the three support ribs are uniformly distributed, the angle between every two support ribs is 120 degrees, and the support and axial limiting effects are achieved on the flow guide sleeve 3; an anti-rotation block 19 fixed with the guide sleeve 3 by a screw II 20 is arranged in the support groove of the guide sleeve 3, so that the guide sleeve 3 is prevented from rotating under the action of a medium; the guide frame 5 is arranged in the guide sleeve 3, the bearings 7 are arranged at the head and the tail of the guide frame 5, the spring 6 is arranged between the guide frame 5 and the valve clack 8, the spring 6 is arranged in the limiting holes of the guide frame 5 and the valve clack 8, the guide cone 2 is arranged at the tail of the guide sleeve 3, when a medium flows back, the medium can only act on the valve clack 8 through the guide cone 2, a certain impact force is reduced, and the slow closing effect is achieved; the valve clack 8 and the flow guide sleeve 3 are provided with convex ribs, the convex ribs are provided with corresponding pin shaft holes, and the spring is tightened by using a pin shaft and a nut, so that the valve clack and the flow guide sleeve are fixed at a certain position and are convenient to take out; a metal winding pad 12 and a flooding plug 13 are arranged between the valve seat 11 and the valve body 1 and are fixed through a valve seat fixer 9 and a screw I10, and when the metal winding pad 12 leaks, the flooding plug 13 plays a role in compensating the leakage; a winding gasket 14 is arranged between the valve body 1 and the valve cover 16, the winding gasket 14 is fixedly connected through a fastening piece 15, and the compression amount of the winding gasket 14 is controlled to realize sealing through the principle of quantitative compression.

When the valve is internally jammed or fails in sealing, the online maintenance function is realized through the following steps:

step 1: the fastening piece 15 between the valve cover 16 and the valve body 1 is disassembled, and the valve cover 16 and the winding sealing gasket 14 between the valve cover 16 and the winding sealing gasket are removed.

Step 2: the valve clack 8 and the guide sleeve 3 are provided with corresponding pin shaft holes in which pin shafts 17 are arranged, the tail parts of the pin shafts 17 are provided with threads, the nut 18 is utilized to tighten the pretightening force of the spring, so that the valve clack 8 is opened to a certain position and fixed with the guide sleeve 3, and then the valve clack 8 and the guide sleeve 3 are integrally taken out from the supporting ribs in the valve body and taken out of the valve cavity for next-step disassembly.

And step 3: the nut 18 is removed, the valve flap 8 is removed from the guide frame 5, and the spring 8 is removed.

And 4, step 4: and (3) disassembling the guide frame 5 and the flow guide sleeve 3, taking down the guide frame 5, and disassembling the bearing 7 at the head and the tail of the guide frame 5.

And 5: if the valve seat sealing piece needs to be replaced, the screw I10 on the valve seat fixer 9 is detached, and then the valve seat fixer 9 is screwed out of the valve body 1.

Step 6: the valve seat 11 is removed, followed by the metal wound gasket 12 and the flooding plug 13, completing the valve disassembly.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

Claims

1. A cryogenic axial-flow check valve with online maintenance function, comprising a valve body, a valve seat, a guide sleeve, a valve cover, and a valve flap, wherein the valve cover is a top-loading valve cover, so The valve cover is provided with a support rib, the valve body is provided with two support ribs, the guide sleeve is provided with three support grooves corresponding to the support ribs, and the guide sleeve support groove is provided with a screw II The anti-rotation block fixed with the guide sleeve, the guide frame is provided inside the guide sleeve, the head and the tail of the guide frame are provided with bearings, and the spring is installed between the guide frame and the valve disc. Among the limiting holes of the guide frame and the valve disc, a guide cone is arranged at the tail of the guide sleeve, a raised rib is arranged on the valve disc and the guide sleeve, and a corresponding pin shaft hole is arranged on the raised rib The valve seat and the valve body are provided with a metal wound gasket and a pan plug, which are fixed by the valve seat holder and the screw I, and the valve body and the valve cover are provided with a wound gasket, which is fixedly connected by a fastener.

2 . The cryogenic axial flow check valve with on-line maintenance function according to claim 1 , wherein the three support ribs are evenly distributed, and the angle between them is 120°. 3 .

3 . The cryogenic axial flow check valve with on-line maintenance function according to claim 1 , wherein the flood plug is back-to-back flood plug. 4 .