CN216951831U

CN216951831U - Gravity check valve applied to vertical pipeline

Info

Publication number: CN216951831U
Application number: CN202220433391.6U
Authority: CN
Inventors: 李炜; 田杰锋; 晁红伟; 吴建军; 周辉辉; 马琦; 陈红志
Original assignee: Hangzhou Guoneng Steam Turbine Engineering Co Ltd
Current assignee: Hangzhou Guoneng Steam Turbine Engineering Co Ltd
Priority date: 2022-03-01
Filing date: 2022-03-01
Publication date: 2022-07-12
Anticipated expiration: 2032-03-01

Abstract

The utility model relates to the field of mechanical devices. The purpose is to provide a gravity check valve with an improved structure, which has the characteristics of simple structure, small opening resistance on a vertical pipeline and low manufacturing cost. The technical scheme is as follows: a gravity check valve applied to a vertical pipeline comprises an upper valve shell and a lower valve shell which are connected up and down; the method is characterized in that: the top end plane of the upper valve shell is parallel to the bottom end plane of the lower valve shell; a valve disc with a guide post can be vertically and slidably positioned in the gravity check valve, and a guide pipe which can be matched with the guide post is also fixed in the center of the upper valve shell and is used as a track for the valve disc to slide up and down; the bottom of lower valve casing is provided with the meshing mouth that can mutually support with the valve disc.

Description

Gravity check valve applied to vertical pipeline

Technical Field

The utility model relates to the field of mechanical devices, in particular to a gravity switch valve for gas, liquid and other media, and particularly relates to a gravity check valve arranged on a vertical pipeline.

Background

In the field of pipeline medium transportation, various check valves are frequently installed to prevent backflow of media, guarantee normal transportation of media and prevent accidents caused by backflow of media.

At present, the check valve installed on the pipeline, such as a common split-clamping double-flap check valve and a swing check valve in the market, realizes the closing and closing of the valve, and realizes the closing of the valve through the tension of a check spring between the valve flap and the valve body. When the fluid flows and the power generated by the fluid flow is greater than the tension of the spring, the valve is opened; otherwise, when the fluid is static or the power is insufficient, the valve is closed. When the check valve is installed on a vertical pipeline, the force required by opening the valve is added by the gravity of the valve clack on the basis of the tensile force of the spring, and the resistance is larger. And the common check valve has relatively complex structure and relatively high manufacturing cost. Therefore, the design of the check valve which has a simple structure, small valve opening resistance and low manufacturing cost and can be installed on a vertical pipeline becomes a problem to be solved urgently.

SUMMERY OF THE UTILITY MODEL

It is an object of the present invention to overcome the above-mentioned deficiencies of the prior art by providing an improved construction of a gravity check valve having the features of a simple construction, a low resistance to opening in a vertical pipe and a low manufacturing cost.

The technical scheme provided by the utility model is as follows:

a gravity check valve applied to a vertical pipeline comprises an upper valve shell and a lower valve shell which are connected up and down; the method is characterized in that: the top end plane of the upper valve shell is parallel to the bottom end plane of the lower valve shell; a valve disc with a guide post can be vertically and slidably positioned in the gravity check valve, and a guide pipe which can be matched with the guide post is also fixed in the center of the upper valve shell and is used as a track for the valve disc to slide up and down; the bottom of lower valve casing is provided with the meshing mouth that can mutually support with the valve disc.

The shell part of the upper valve shell is annular, and the part for connecting with the outside is of a flange structure; the guide pipe is coaxially fixed in the center of the upper valve shell through a plurality of support columns.

The lower valve casing is cylindrical, and the upper end and the lower end of the lower valve casing are two flanges which are parallel to each other.

The upper end flange of lower valve casing is being equipped with through-hole and screw hole evenly, and the lower extreme flange is being equipped with the through-hole evenly.

The connecting part of the upper valve shell is a flange which is uniformly provided with through holes and threaded holes.

The engagement openings are distributed on the inner side of the lower end flange of the lower valve shell and are arranged along the edge of the inner hole in a looping mode.

The connection part of the upper valve casing and the lower valve casing is provided with a sealing ring for sealing so as to ensure the sealing performance between the upper valve casing and the lower valve casing and avoid the leakage of the medium between the valve casings.

And the top end surface of the lower end flange is provided with a groove for mounting a sealing ring.

The utility model has the beneficial effects that: the gravity check valve has the advantages of ingenious design, simple structure, simplicity in operation, simple non-return principle, no failure, stable valve operation, almost no damage, convenience in maintenance and use, and suitability for popularization and application.

Drawings

This is further illustrated below in connection with the embodiments of the figures shown.

Fig. 1 is a schematic front view of the present invention.

Fig. 2 is a schematic top view of the present invention.

FIG. 3 is a view taken along the line A of FIG. 1

Fig. 4 is a schematic view of the valve opening state of the present invention.

Detailed Description

The following further description is made with reference to the embodiments shown in the drawings.

The gravity check valve applied to a vertical pipe shown in the drawing comprises an upper valve housing 1 and a lower valve housing 5 which are connected up and down by bolts; according to the check valve characteristics, the upper valve housing is mounted above and the lower valve housing is mounted below. The top end plane of the upper valve shell is parallel to the bottom end plane of the lower valve shell; the shell part of the upper valve shell is annular, and the part (namely the annular part) for connecting with the outside is designed into a flange structure; the lower valve casing is cylindrical, and the upper end and the lower end of the lower valve casing are two flanges which are parallel to each other.

A valve disc 4 (the valve disc is in a thin-wall disc bowl shape; the guide column is vertically fixed at the midpoint of the valve disc) with a guide column 8 can be vertically and slidably positioned in the gravity check valve, and the center of the upper valve shell is also fixed with a guide pipe 9 which can be matched with the guide pipe and is used as a track for the valve disc to slide up and down; the guide tube is coaxially fixed in the center of the upper valve housing by a plurality of support posts 6 (three support posts are shown in the figure). The exterior of the guide post and the interior of the guide tube channel in contact therewith are preferably smooth and thin-walled shapes. When the guide post is installed and operated, the guide post is completely positioned in a vertical pipeline for conveying fluid.

The bottom of the lower valve casing is provided with an engaging opening 7 which can be matched with a valve disc. The engagement openings are distributed on the inner side of the lower end flange of the lower valve shell and are arranged along the edge of the inner hole in a looping mode. The contact surface between the valve disc and the lower valve casing is machined into a horizontal smooth surface.

Through holes and threaded holes (arranged at intervals) are uniformly distributed in the circumferential direction of an upper end flange of the lower valve shell, and through holes are uniformly distributed on a lower end flange. Through holes and threaded holes are uniformly distributed in the circumferential direction of the connecting part of the upper valve shell (the through holes and the threaded holes are arranged at intervals), the through holes correspond to the threaded holes in the top surface of the lower valve shell one by one, and the upper valve shell and the lower valve shell are assembled together by screwing in the round hexagon socket head cap screws 2. The threaded hole at the upper valve shell connecting part is used for connecting the external pipeline flange with the gravity check valve.

The connecting part of the upper valve casing and the lower valve casing is provided with an O-shaped sealing ring for sealing (the O-shaped sealing ring 3 with corresponding specification is filled in a groove on the top surface of the lower valve casing and then is assembled and connected with the upper valve casing) so as to ensure the sealing performance between the upper valve casing and the lower valve casing and avoid the leakage of a medium between the valve casings.

The gravity check valve is arranged on a vertical pipeline for conveying fluid, and a flange of the pipeline right above is connected with threaded holes uniformly distributed in the circumferential direction of the flange of the upper valve shell through bolts, gaskets and gaskets; the flange of the pipeline right below is connected with the through hole of the flange at the lower end of the bottom of the lower valve shell through a bolt, a nut, a gasket and a gasket.

When the medium (fluid) in the pipeline is static, due to the action of newton's gravitational force, the valve disc is in close contact with the lower valve casing due to its own weight without any gap, and the gravity check valve is in a closed state (as shown in fig. 4).

When the medium in the pipeline has the power of flowing back from top to bottom, the gravity check valve is closed more tightly due to the self weight of the valve disc and the force acting right above the valve disc, and the generation of the flowing back of the medium is well prevented.

When the medium in the pipeline flows from bottom to top, the force generated by the flowing medium pushes the bottom of the dish. The valve disc is forced directly below and overcomes its own weight, and the butterfly valve moves upward so that the gravity check valve opens and is in an operating state (as shown in fig. 1).

The flanges of the upper and lower valve casings can be manufactured according to various standard flanges, and the requirements of various flange interface working conditions are met. When the medium is low-pressure gas, the valve disc can be thinned, so that the dead weight is reduced; when the overall working pressure of the medium is not high, the overall valve can be made thinner and thinner, so that the check effect of the gravity check valve is more remarkable during working.

The gravity check valve is ingenious in design, can be opened along with the flow of fluid from bottom to top, can be automatically closed when the fluid is not moved or flows backwards, is stable and reliable in work, is made of metal (such as carbon steel, stainless steel, aluminum and the like) and is free of springs, low in failure rate and worthy of popularization.

Claims

1. A gravity check valve applied to a vertical pipeline comprises an upper valve casing (1) and a lower valve casing (5) which are connected up and down; the method is characterized in that: the top end plane of the upper valve shell is parallel to the bottom end plane of the lower valve shell; a valve disc (4) with a guide post (8) can be vertically and slidably positioned in the gravity check valve, and a guide pipe (9) which can be matched with the guide post is also fixed at the center of the upper valve shell and used as a track for the valve disc to slide up and down; the bottom of the lower valve shell is provided with an engaging opening (7) which can be matched with the valve disc.

2. The gravity check valve applied to a vertical pipe according to claim 1, wherein: the shell part of the upper valve shell is annular, and the part for connecting with the outside is of a flange structure; the guide pipe is coaxially fixed in the center of the upper valve casing through a plurality of support columns (6).

3. The gravity check valve applied to a vertical pipe according to claim 2, wherein: the lower valve casing is cylindrical, and the upper end and the lower end of the lower valve casing are two flanges which are parallel to each other.

4. The gravity check valve applied to a vertical pipe according to claim 3, wherein: the upper end flange of lower valve casing is being equipped with through-hole and screw hole, and the lower extreme flange is being equipped with the through-hole.

5. The gravity check valve applied to a vertical pipe according to claim 4, wherein: the connecting part of the upper valve shell is a flange which is uniformly provided with through holes and threaded holes.

6. The gravity check valve applied to a vertical pipe as claimed in claim 5, wherein: the engagement openings are distributed on the inner side of the lower end flange of the lower valve shell and are arranged along the edge of the inner hole in a looping mode.

7. The gravity check valve applied to a vertical pipe according to claim 6, wherein: the connection part of the upper valve casing and the lower valve casing is provided with an O-shaped sealing ring for sealing so as to ensure the sealing performance between the upper valve casing and the lower valve casing and avoid the leakage of the medium between the valve casings.

8. The gravity check valve applied to a vertical pipe according to claim 7, wherein: and the top end surface of the lower end flange is provided with a groove for mounting an O-shaped sealing ring.