CN111561590A

CN111561590A - Stop check valve

Info

Publication number: CN111561590A
Application number: CN202010435830.2A
Authority: CN
Inventors: 祁少云; 梁德乐; 罗显达
Original assignee: Guangzhou Shipyard International Co Ltd
Current assignee: Guangzhou Shipyard International Co Ltd
Priority date: 2020-05-21
Filing date: 2020-05-21
Publication date: 2020-08-21

Abstract

The invention relates to the technical field of valves and discloses a stop check valve. The stop check valve comprises a valve body, a valve clack and a valve rod, wherein the valve body is provided with an inlet, a valve seat and an outlet which are communicated with each other; the valve clack is arranged above the valve seat; the valve rod comprises a sliding end and a connecting end, the sliding end is connected with the valve clack in a sliding mode, the connecting end is arranged below the valve body in a protruding mode, the sliding valve rod enables the valve rod to ascend or descend to change the position of the limiting column between the limiting grooves, and the valve clack is driven to be selectively abutted to the valve seat to communicate, stop or stop the inlet and the outlet. The end of the valve rod, which is far away from the valve clack, is convexly arranged at the lower end of the valve body, so that the structure of the upper end of the stop check valve is simplified, the stop check valve can be used in narrow spaces and passages, particularly pipelines arranged on the top wall, an operator can conveniently operate the stop check valve below to realize communication, stop or non-return of the pipelines, the waste of pipeline materials is reduced, the space is saved, and the cost is also reduced.

Description

Stop check valve

Technical Field

The invention relates to the technical field of valves, in particular to a stop check valve.

Background

The stop check valve is a multipurpose valve having both functions of a stop valve and a check valve. In the prior art, the stop check valve only can enable the operating hand wheel to move upwards, and after the operating hand wheel moves upwards, the operating hand wheel is close to the top wall, so that the operation is inconvenient; if the operating hand wheel is downward, the check valve loses the check function.

The current solutions are two of the following: 1. after turning the pipeline to the ground, adding a stop check valve; but for narrow space and passage, the utility model occupies more space and is not beautiful, and the problem of wasting pipes exists. 2. The function of the stop check valve is separated into a stop valve with a stop function and a check valve with a check function; but adds to the cost of the valve member.

Therefore, a check valve is needed to solve the above problems.

Disclosure of Invention

Based on the above, the present invention provides a check valve, which is suitable for use in a narrow space and is convenient to operate.

In order to achieve the purpose, the invention adopts the following technical scheme:

a check valve, comprising:

the valve body is provided with an inlet, a valve seat and an outlet which are communicated with each other;

the valve clack is arranged above the valve seat;

the valve rod comprises a sliding end and a connecting end, the sliding end is in sliding connection with the valve clack, the connecting end is in threaded connection with the valve body, the connecting end is convexly arranged below the valve body, the valve rod slides to drive the valve clack to selectively abut against the valve seat so as to communicate, stop or check the inlet and the outlet.

As a preferred scheme of the stop check valve, the stop check valve further comprises a lower cover arranged at the lower end of the valve body, and the connecting end is in threaded connection with the lower cover.

As a preferred scheme of the stop check valve, the lower cover is provided with a connecting arm, one end of the connecting arm, which is far away from the valve body, is in threaded connection with the connecting end, and the other end of the connecting arm is in sealing connection with the sliding end.

As a preferable scheme of the stop check valve, the lower cover is further provided with a sealing packing and a sealing packing gland for fixing the sealing packing, the sealing packing is arranged between the valve rod and the lower cover, and the sealing packing gland is connected with a threaded hole of the lower cover.

As a preferable mode of the check valve, the connection arm and the screw hole are provided at an interval in an axial direction of the lower cover.

Preferably, the thread of the connection end screwed with the lower cover is a left-hand thread.

Preferably, the valve flap is provided with a sliding groove arranged along the axial direction of the valve flap, and the sliding end is slidably arranged in the sliding groove.

As a preferred scheme of the stop check valve, a limiting column is arranged on the sliding groove, a limiting groove extending in the vertical direction is arranged at the sliding end, and the limiting column is arranged in the limiting groove in a sliding mode.

As a preferable scheme of the stop check valve, a hand wheel is further arranged at one end, far away from the sliding end, of the connecting end.

As a preferable scheme of the stop check valve, a threaded limit ring is further arranged on one side, away from the sliding end, of the connecting end.

The invention has the beneficial effects that: the lower end of the valve body is convexly arranged at one end, far away from the valve clack, of the valve rod, the structure at the upper end of the stop check valve is simplified, the stop check valve can be used in narrow spaces and passages, particularly in pipelines arranged on the top wall, and an operator can conveniently operate the stop check valve below to realize communication, stop or check on the pipelines. In addition, compared with the prior art, the waste of pipeline materials is reduced and the space is saved by prolonging the pipeline and arranging the stop check valve; compared with the mode of adopting a stop valve and a check valve in the prior art, the cost is reduced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

FIG. 1 is a schematic view of a check state of a check valve according to an embodiment of the present invention;

FIG. 2 is a schematic illustration of the check state of a check valve provided in accordance with an embodiment of the present invention;

fig. 3 is a schematic diagram of a one-way liquid flow state of a check valve according to an embodiment of the present invention.

In the figure:

1-a valve body; 11-an inlet; 12-a valve seat; 13-an outlet;

2-valve clack; 21-a sliding groove; 22-a limit post;

3-a valve stem; 31-sliding end; 32-a connection end; 33-a limiting groove; 34-a threaded stop collar;

4, covering the upper cover;

5-lower cover; 51-a linker arm; 52-sealing packing; 53-sealing packing gland; 54-a threaded hole;

6-hand wheel;

7-reinforcing ribs.

Detailed Description

In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 3, the present embodiment provides a cut-off check valve including a valve body 1, a valve flap 2, and a valve stem 3, the valve body 1 being provided with an inlet 11, a valve seat 12, and an outlet 13 communicating with each other; the valve clack 2 is arranged above the valve seat 12; the valve rod 3 comprises a sliding end 31 in sliding connection with the valve clack 2 and a connecting end 32 in threaded connection with the valve body 1, the connecting end 32 is convexly arranged below the valve body 1, and the valve clack 2 of the sliding valve rod 3 is selectively abutted against the valve seat 12 to communicate, stop or check the inlet 11 and the outlet 13.

Through the protruding lower extreme of locating valve body 1 of one end of keeping away from valve clack 2 with valve rod 3, simplified the structure of stop check valve upper end, make stop check valve can be used for narrow and small space and passageway, especially lay the pipeline in the roof, the operator of being convenient for operates in the below stop check valve in order to realize the intercommunication, end or the non return to the pipeline. In addition, compared with the prior art, the waste of pipeline materials is reduced and the space is saved by prolonging the pipeline and arranging the stop check valve; compared with the mode of adopting a stop valve and a check valve in the prior art, the cost is reduced.

The valve seat 12 is horizontally arranged in the valve body 1 and is communicated with the inlet 11 and the opening, the valve clack 2 is arranged above the valve seat 12, and the valve rod 3 penetrates through the valve seat 12 along the vertical direction; the stop check valve further comprises an upper cover 4 and a lower cover 5, the upper cover 4 is arranged at the upper end of the valve body 1, the lower cover 5 is arranged at the lower end of the valve body 1, the upper cover 4 and the upper end of the valve body 1, the lower cover 5 and the lower end of the valve body 1 are detachably connected through bolts, and sealing gaskets are arranged at the upper ends of the upper cover 4 and the valve body 1, the lower cover 5 and the lower end of the valve body 1 and are used for guaranteeing the sealing performance of the valve seat 12.

The connecting end 32 of the valve rod 3 is in threaded connection with the connecting arm 51, the valve rod 3 is screwed to realize the movement of the valve rod 3 along the vertical direction of the lower cover 5, the valve clack 2 is kept in abutting connection with the valve seat 12 by the downward gravity of the valve clack 2, and then the sliding end 31 and the valve clack 2 are in a tensioned or loosened state to realize the disconnection or communication between the inlet 11 and the outlet 13, namely, the valve clack has the functions of stopping and stopping.

Specifically, the lower cover 5 is provided with a connecting arm 51, one end of the connecting arm 51, which is far away from the valve body 1, is in threaded connection with the connecting end 32 of the valve rod 3, and the other end is in sealing connection with the sliding end 31 of the valve rod 3; the connecting arm 51 effects on the one hand a threaded connection of the valve rod 3 with the lower cap 5 and on the other hand a sealing of the valve rod 3 with the lower cap 5.

Further, the lower cover 5 is further provided with a sealing packing 52 and a sealing packing gland 53 for fixing the sealing packing 52, the sealing packing 52 is arranged between the valve rod 3 and the lower cover 5, and sealing between the valve rod 3 and the lower cover 5 is further realized; the lower cover 5 is provided with a threaded hole 54, the packing gland 53 is connected with the threaded hole 54 of the lower cover 5, so that the installation and the replacement of the packing 52 are convenient, and preferably, the connecting arm 51 and the threaded hole 54 are arranged at intervals along the axial direction of the lower cover 5, so that the interference of the connecting arm 51 cannot be caused when the packing gland 53 is detached, and the operation is more convenient.

In order to meet the operation habit of operators, namely, the pipeline is disconnected when the valve rod 3 is screwed clockwise, and the pipeline is connected when the valve rod 3 is screwed anticlockwise; therefore, in this embodiment, the screw thread of the connection end 32 and the lower cover 5 is a left-handed screw thread, when the valve rod 3 is screwed clockwise, the valve rod 3 moves downward, so that the limiting post 22 and the limiting groove 33 are both in a downward tensioned state, the valve flap 2 is tightly abutted against the valve seat 12, at this time, the inlet 11 and the outlet 13 are not communicated, and the pipeline is disconnected; when the valve rod 3 is screwed anticlockwise, the valve rod 3 moves upwards, the valve clack 2 is downwards kept to be freely abutted against the valve seat 12 under the action of self gravity, liquid in the pipeline upwards pushes the valve seat 12 to be communicated with the outlet 13 through the inlet 11, and the pipeline is conducted. It should be noted that, a threaded limiting ring 34 is further disposed on a side of the connecting end 32 away from the sliding end 31, the upward moving distance of the valve rod 3 is limited by the threaded limiting ring 34, and when the valve rod 3 moves upward and contacts the threaded limiting ring 34 and cannot move upward, it is ensured that the top end of the sliding end 31 does not touch the top end of the sliding groove 21, so as to prevent interference between the sliding end 31 and the sliding groove 21, so that the valve flap 2 can more effectively fall on the valve seat 12, and a non-return function is achieved.

In order to make the stop check valve function as a stop valve, the valve clack 2 is provided with a sliding groove 21 arranged along the axial direction thereof, the sliding end 31 is slidably arranged in the sliding groove 21, and the valve rod 3 can move relative to the valve clack 2 along the vertical direction during screwing the valve rod 3. Specifically, the sliding groove 21 is provided with a limiting post 22, the sliding end 31 is provided with a limiting groove 33 extending along the vertical direction, and the limiting post 22 is slidably arranged in the limiting groove 33.

The valve rod 3 is screwed clockwise, as shown in fig. 1, when the limiting column 22 is in tension state abutting with the upper end of the limiting groove 33 and the valve clack 2 is in tight abutting with the valve seat 12 under the influence of tension force, the stop check valve is in a stop state, the inlet 11 is not communicated with the outlet 13, and the pipeline is disconnected; the valve rod 3 is screwed along the counterclockwise direction, as shown in fig. 2, the limit column 22 is separated from the lower end of the limit groove 33 and the valve clack 2 is freely abutted with the valve seat 12 downwards under the self gravity, and at this time, the stop check valve is in a non-return state; after liquid in the pipeline passes through the inlet 11 and the valve seat 12 as shown in fig. 2, the liquid further evolves as shown in fig. 3 to push the valve flap 2 upwards to be separated from the valve seat 12, and the liquid can flow out of the outlet 13, so that the pipeline is conducted. On the contrary, as shown in fig. 2, the liquid at the outlet 13 cannot flow back into the inlet 11 through the valve seat 12, i.e. the one-way conduction from the inlet 11 to the outlet 13 is realized.

Preferably, the hand wheel 6 is further arranged at one end of the connecting end 32 of the valve rod 3, which is far away from the sliding end 31, so that the operation is convenient and labor is saved. The valve body 1 is also provided with a reinforcing rib 7 for reinforcing the strength of the outlet 13 and the inlet 11.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Claims

1. A check valve, comprising:

the valve body (1) is provided with an inlet (11), a valve seat (12) and an outlet (13) which are communicated with each other;

a valve flap (2) disposed above the valve seat (12);

valve rod (3), including with valve clack (2) sliding connection's slip end (31) and with valve body (1) threaded connection's link (32), link (32) protruding locate the below of valve body (1), slide valve rod (3) drive valve clack (2) selectively butt valve seat (12) with intercommunication, end or non return import (11) with export (13).

2. The stop check valve according to claim 1, further comprising a lower cap (5) provided at a lower end of the valve body (1), the connection end (32) being screw-coupled with the lower cap (5).

3. The non-return stop valve according to claim 2, characterized in that the lower cap (5) is provided with a connecting arm (51), one end of the connecting arm (51) remote from the valve body (1) being screwed to the connecting end (32) and the other end being sealingly connected to the sliding end (31).

4. The stop check valve according to claim 3, characterized in that the lower cover (5) is further provided with a packing (52) and a packing gland (53) for fixing the packing (52), the packing (52) being interposed between the valve stem (3) and the lower cover (5), the packing gland (53) being connected with a threaded hole (54) of the lower cover (5).

5. The non-return stop valve according to claim 4, characterized in that the connecting arms (51) and the threaded holes (54) are arranged at intervals in the axial direction of the lower cap (5).

6. The non-return stop valve according to claim 3, characterized in that the thread of the connection end (32) screwed to the lower cap (5) is a left-handed thread.

7. The non-return stop valve according to claim 1, characterized in that the flap (2) is provided with a sliding groove (21) arranged in its axial direction, the sliding end (31) being slidingly disposed in the sliding groove (21).

8. The stop check valve according to claim 7, characterized in that the sliding groove (21) is provided with a stop post (22), the sliding end (31) is provided with a stop groove (33) extending in a vertical direction, and the stop post (22) is slidably disposed in the stop groove (33).

9. The non-return stop valve according to claim 1, characterized in that the end of the connecting end (32) remote from the sliding end (31) is also provided with a hand wheel (6).

10. The non-return stop valve according to claim 1, characterized in that the connecting end (32) is further provided with a threaded stop ring (34) on the side remote from the sliding end (31).