CN207830647U - Screw down nonreturn valve - Google Patents

Abstract

The utility model provides a cut-off check valve, relates to the technical field of valves, and solves the technical problem in the prior art that there is no universal interchangeability between the check valve and the cut-off valve. The device includes a valve stem and a valve disc, wherein: the valve stem and the valve disc are movably connected, and the valve stem can move along the axial direction of the valve stem relative to the valve seat; In the extrusion state, the valve stem can squeeze the valve clack and fix the valve clack on the valve seat, and the valve clack fixed on the valve seat can block the passage between the liquid inlet and the liquid outlet of the valve seat; the valve stem When in the separated state, the valve stem releases the fixing effect on the valve disc, and the liquid flowing in from the liquid inlet can push the valve stem so that the passage between the liquid inlet and the liquid outlet is in a connected state. The utility model is used for improving the function of the valve, and realizes that the valve can be used as a cut-off valve or a check valve.

Description

Stop check valve

technical field

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

Background technique

Check valve refers to the valve that relies on the flow of the medium itself to automatically open and close the disc to prevent the backflow of the medium, also known as check valve, one-way valve, reverse flow valve and back pressure valve. Under the action of fluid pressure flowing in one direction, the valve disc of the check valve opens; when the fluid flows in the opposite direction, the valve disc closes under the action of fluid pressure and the self-weight of the valve disc, thereby cutting off the flow.

The globe valve, also known as the gate valve, belongs to the forced sealing valve. The globe valve plays the role of cutting off and throttling the medium in the pipeline where it is located. Its sealing is by applying torque to the valve stem, and the valve stem is in the axial direction. Apply pressure to the valve clack so that the sealing surface of the valve clack and the sealing surface of the valve seat fit closely to prevent the medium from leaking along the gap between the sealing surfaces.

The applicant finds that the prior art has at least the following technical problems:

The structure of the check valve and the stop valve are different, and the purpose and use of the two are also different, so that the existing check valve and the stop valve cannot be used interchangeably, that is, the check valve cannot be used as a stop valve, and the stop valve cannot be used interchangeably. Cannot be used as a check valve.

Utility model content

The purpose of the utility model is to provide a cut-off check valve, which solves the technical problem in the prior art that there is no universal interchangeability between the check valve and the cut-off valve. The many technical effects that can be produced by the preferred technical solutions among the many technical solutions provided by the utility model are described in detail below.

In order to achieve the above object, the utility model provides the following technical solutions:

A cut-off check valve provided by the utility model includes a valve stem and a valve flap, wherein: the valve stem is movably connected with the valve flap, and the valve stem can move along the axis of the valve stem relative to the valve seat. Move in the direction; the valve stem has a squeezed state and a separated state. When the valve stem is in the squeezed state, the valve stem can squeeze the valve disc and fix the valve disc on the valve seat Above, the valve disc fixed on the valve seat can block the passage between the liquid inlet and the liquid outlet of the valve seat; when the valve stem is in a separated state, the valve stem releases the Due to the fixing effect of the valve clack, the liquid flowing in from the liquid inlet can push the valve stem so that the passage between the liquid inlet and the liquid outlet is in a communication state.

Preferably, the valve stem is elastically connected to the valve flap, and when the valve stem is in a separated state, the valve flap is subjected to a force away from the valve stem.

Preferably, the valve clack includes a valve clack plate and a valve clack connecting post, the valve clack connecting post is arranged on the valve clack plate and connected with the valve clack plate; the valve rod is provided with a connecting post hole, and the disc connecting post can be inserted into the connecting post hole.

Preferably, an elastic member is sheathed on the disc connecting column, the elastic member is located between the disc plate and the valve cover, and the elastic member is in a compressed state when the valve stem is in a separated state.

Preferably, the flap plate includes an elastic plate and a rigid plate, the rigid plate is arranged on the elastic plate and the elastic plate is connected to the rigid plate.

Preferably, the rigid plate is provided with a connecting head, and the elastic plate is sleeved on the connecting head.

Preferably, the rigid plate, the disc connecting column and the connecting head are integrally formed.

Preferably, the length of the connecting post of the valve flap is not greater than the depth of the hole of the connecting post.

Preferably, the valve flap plate is a circular plate, and the valve flap connecting column is arranged at the center of the valve flap plate.

Preferably, a bonnet is connected to the valve stem, and the bonnet is threadedly connected to the valve seat; a hand wheel is provided at one end of the bonnet; a disc placement surface is provided in the valve seat, and the When the valve stem is in a squeezed state, the valve stem can squeeze the valve flap onto the valve flap placement surface.

The utility model provides a cut-off check valve, the valve rod and the valve disc are in a movable connection, and the valve rod can move along the axial direction of the valve rod relative to the valve seat, and the valve rod can squeeze the valve disc and fix the valve disc on the When the valve stem moves relative to the valve seat, the valve stem can also release the role of the valve clack from being fixed on the valve seat, so that the stop check valve is equivalent to a check valve. The technical problem that there is no universal interchangeability between the check valve and the shut-off valve in the prior art is solved.

The preferred technical solution of the utility model can also produce the following technical effects at least:

There is an elastic connection between the valve stem and the valve disc, so that the stop check valve can be placed upright (the central axis of the valve disc along the vertical direction) or lying down (the central axis of the valve disc is along the horizontal direction), and the stop check valve can Can be used as a check valve for normal use.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic structural view of the valve rod and the valve clack provided by the embodiment of the present invention;

Fig. 2 is a schematic diagram of the explosion of the valve stem and disc provided by the embodiment of the present invention;

Fig. 3 is a schematic structural view of the cut-off check valve provided by the embodiment of the present invention;

Fig. 4 is a schematic structural view of the valve seat provided by the embodiment of the present invention;

Fig. 5 is a schematic structural diagram of the valve stem provided by the embodiment of the present invention when it is in a squeezed state;

Fig. 6 is a schematic structural diagram of the valve stem provided by the embodiment of the present invention when it is in a separated state.

In the figure 1, valve stem; 11, connecting column hole; 2, valve flap; 21, valve flap plate; 211, elastic plate; 212, rigid plate; 22, valve flap connecting column; 23, connecting head; 3, valve seat ; 31, liquid inlet; 32, liquid outlet; 33, disc placement surface; 4, elastic member; 5, valve cover; 51, spring contact surface; 6, hand wheel.

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described in detail below. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present utility model, all other implementations obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present utility model.

Referring to Fig. 1-Fig. 6, the utility model provides a cut-off check valve, including a valve stem 1 and a valve flap 2, wherein: the valve stem 1 and the valve flap 2 are movably connected, and the valve stem 1 can move relative to the valve seat 3 Move along the axial direction of the valve stem 1; the valve stem 1 has a squeezed state and a separated state, as shown in Figure 5, when the valve stem 1 is in the squeezed state, the valve stem 1 can squeeze the valve disc 2 and move the valve disc 2. Fixed on the valve seat 3, the disc 2 fixed on the valve seat 3 can block the passage between the liquid inlet 31 and the liquid outlet 32 of the valve seat 3; as shown in Figure 6, the valve stem 1 is in the separation state, the valve stem 1 releases the fixing effect on the valve disc 2, and the liquid flowing in from the liquid inlet 31 can push the valve stem 1 so that the passage between the liquid inlet 31 and the liquid outlet 32 is in a connected state. Due to the different structures of the check valve and the globe valve, the purposes and usage methods of the two are also different, so that the existing check valve and the globe valve cannot be used interchangeably, that is, the check valve cannot be used as a globe valve, and the globe valve cannot be used interchangeably. The valve cannot be used as a check valve; in the cut-off check valve provided by the utility model, since the valve stem 1 can move along the axial direction of the valve stem 1 relative to the valve seat 3, the valve stem 1 is squeezed and separated. Two states, when the valve stem 1 is in the squeezed state, the valve stem 1 can squeeze the valve disc 2 and fix the valve disc 2 on the valve seat 3. At this time, the stop check valve is equivalent to a stop valve, that is, the valve Disc 2 can block the passage between the liquid inlet 31 and the liquid outlet 32 of valve seat 3; Release the function of fixing the valve disc 2 on the valve seat 3, and the valve disc 2 can move along the axial direction of the valve stem 1 relative to the valve stem 1. At this time, the stop check valve is equivalent to a check valve, that is, from The liquid flowing in from the liquid inlet 31 can push the valve rod 1 so that the passage between the liquid inlet 31 and the liquid outlet 32 is in a connected state; the cut-off check valve provided by the utility model can be used as a cut-off valve and can When the check valve is used, it solves the technical problem in the prior art that there is no universal interchangeability between the check valve and the stop valve.

For the valve stem 1 can move along the axial direction of the valve stem 1 relative to the valve seat 3, the valve stem 1 is fixedly connected with the valve cover 5, the valve cover 5 and the valve seat 3 can be threaded, when the valve cover 5 is completely closed state, the cut-off check valve at this time is equivalent to a cut-off valve; rotating the valve cover 5 makes the valve cover 5 in a half-closed and half-open state, and the cut-off check valve at this time is equivalent to a check valve, and even if the rotary valve The cover 5 makes the valve cover 5 in a semi-closed and half-open state, and the threaded connection between the valve cover 5 and the valve seat 3 can also meet the sealing performance of the valve cover 5 and the valve seat 3; Without moving, the valve stem 1 can move along the axial direction of the valve stem 1 relative to the valve cover 5 .

As an optional implementation of the embodiment of the present utility model, the valve stem 1 and the valve flap 2 are elastically connected, and when the valve stem 1 is in a separated state, the valve flap 2 is subjected to a force away from the valve stem 1 . In the existing check valve, the valve disc is closed under the action of its own gravity, which requires the placement of the check valve. The check valve needs to be placed upright, that is, the central axis of the valve disc is along the vertical In the vertical direction, if the check valve is rotated 90° and the check valve is placed lying down, that is, the central axis of the disc is along the horizontal direction, the check valve will not work normally and the disc will not close normally. In the preferred embodiment of the present utility model, the valve rod 1 and the valve disc 2 are elastically connected. When the stop check valve is used as a check valve, the valve disc 2 can make the valve disc 2 under the action of its own gravity and elastic force. Closed, even when the stop check valve is placed lying down, the central axis of the valve disc 2 is along the horizontal direction, and the valve disc 2 can make the valve disc 2 close under the action of elastic force, so that the stop check valve can be used normally.

As an optional implementation of the embodiment of the present utility model, the valve disc 2 includes a valve disc plate 21 and a valve disc connecting column 22, and the valve disc connecting column 22 is arranged on the valve disc plate 21 and connected with the valve disc plate 21; the valve stem 1 is provided with a connecting post hole 11, and the disc connecting post 22 can be inserted into the connecting post hole 11. When the valve stem 1 is in the extruded state, one end of the valve stem 1 may be in contact with the valve disc plate 21 and squeeze the valve disc plate 21 so that the valve disc plate 21 is fixed on the valve seat 3, or it may be the valve disc connecting column When 22 is inserted into the connecting column hole 11, the extrusion force generated by the contact between the free end of the valve disc connecting column 22 and the inner end surface of the valve stem 1 will fix the valve disc plate 21 on the valve seat 3, or the valve disc plate 21 will be fixed on the valve seat 3 by the above two methods. The plate 21 is fixed on the valve seat 3; when the valve stem 1 is in a separated state, there is a gap between the valve disc plate 21 and the valve stem 1, and there is a gap between the end surface of the free end of the valve disc connecting column 22 and the internal end surface of the valve stem 1 , so that the valve disc 2 can move relative to the valve stem 1 along the axial direction of the valve stem 1 .

As an optional implementation of the utility model embodiment, the disc connection column 22 is sleeved with an elastic member 4, and the elastic member 4 is located between the valve disc plate 21 and the valve cover 5, as shown in Figure 2, the elastic member 4 can be In contact with the spring contact surface 51, when the valve stem 1 is in a separated state, the elastic member 4 is in a compressed state. When the stop check valve is used as a check valve, even if the stop check valve is placed lying down, the central axis of the valve disc 2 Along the horizontal direction, the valve clack 2 can close the valve clack 2 under the elastic force of the elastic member 4, so that the stop check valve can be used normally. The elastic member 4 is preferably a spring.

As an optional implementation of the embodiment of the present utility model, the valve disc plate 21 includes an elastic plate 211 and a rigid plate 212 , the rigid plate 212 is arranged on the elastic plate 211 and the elastic plate 211 is connected to the rigid plate 212 . The elastic plate 211 can be made of plastic material, and when the valve stem 1 is in a squeezed state, it can improve the sealing performance of the valve clack 2 fixed on the valve seat 3 .

As an optional implementation of the embodiment of the present invention, the rigid plate 212 is provided with a connecting head 23 , and the elastic plate 211 is sleeved on the connecting head 23 .

As an optional implementation of the embodiment of the present utility model, the rigid plate 212 , the disc connecting column 22 and the connecting head 23 are integrally formed.

As an optional implementation of the embodiment of the present utility model, the length of the valve disc connection column 22 is not greater than the depth of the connection column hole 11, so as to avoid the squeeze caused by the contact between the free end of the valve disc connection column 22 and the inner end surface of the valve stem 1. The pressure fixes the disc plate 21 on the valve seat 3, preferably the length of the disc connecting column 22 is equal to the depth of the connecting column hole 11, the extrusion force generated by the contact between the valve disc plate 21 and the valve stem 1 and the valve disc connecting column 22 The extrusion force generated by the contact between the end surface of the free end and the internal end surface of the valve stem 1 fixes the valve disc plate 21 on the valve seat 3 .

As an optional implementation of the embodiment of the present utility model, the valve flap plate 21 is a circular plate, and the valve flap connecting column 22 is arranged at the center of the valve flap plate 21 .

As an optional implementation of the utility model embodiment, one end of the valve cover 5 is provided with a hand wheel 6; the valve seat 3 is provided with a disc placement surface 33, and when the valve stem 1 is in a squeezed state, the valve stem 1 can push the valve The valve disc 2 is pressed against the valve disc placement surface 33 , so that the valve disc 2 can block the passage between the liquid inlet 31 and the liquid outlet 32 of the valve seat 3 .

The above is only a specific embodiment of the present utility model, but the scope of protection of the present utility model is not limited thereto. Anyone familiar with the technical field can easily think of changes or changes within the technical scope disclosed by the utility model Replacement should be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be based on the protection scope of the claims.

Claims (10)

1. A cut-off check valve is characterized in that it comprises a valve stem (1) and a disc (2), wherein: The valve stem (1) is movably connected with the valve flap (2), and the valve stem (1) can move along the axial direction of the valve stem (1) relative to the valve seat (3); The valve stem (1) has an extruded state and a separated state. When the valve stem (1) is in an extruded state, the valve stem (1) can extrude the valve disc (2) and move the valve disc (2) fixed on the valve seat (3), the valve flap (2) fixed on the valve seat (3) can block the liquid inlet (31) and The passage between the liquid outlets (32); when the valve stem (1) is in a separated state, the valve stem (1) releases the fixing effect on the valve disc (2), and from the liquid inlet ( 31) The inflowing liquid can push the valve stem (1) so that the passage between the liquid inlet (31) and the liquid outlet (32) is in a communication state. 2. The cut-off check valve according to claim 1, characterized in that the valve stem (1) is elastically connected to the valve disc (2), and when the valve stem (1) is in a separated state , the valve flap (2) is subjected to a force in a direction away from the valve stem (1). 3. The cut-off check valve according to claim 1, characterized in that, the valve flap (2) comprises a valve flap plate (21) and a valve flap connecting column (22), and the valve flap connecting column (22) It is arranged on the valve disc plate (21) and connected with the valve disc plate (21); the valve stem (1) is provided with a connecting post hole (11), and the valve disc connecting post (22) Can be inserted into the connecting post hole (11). 4. The cut-off check valve according to claim 3, characterized in that an elastic member (4) is sheathed on the disc connecting column (22), and the elastic member (4) is located on the disc plate Between (21) and the valve cover (5), when the valve stem (1) is in a separated state, the elastic member (4) is in a compressed state. 5. The cut-off check valve according to claim 3, characterized in that, the disc plate (21) comprises an elastic plate (211) and a rigid plate (212), and the rigid plate (212) is arranged on the on the elastic plate (211) and the elastic plate (211) is connected with the rigid plate (212). 6. The cut-off check valve according to claim 5, characterized in that, the rigid plate (212) is provided with a connecting head (23), and the elastic plate (211) is sheathed on the connecting head (23). )superior. 7. The cut-off check valve according to claim 6, characterized in that, the rigid plate (212), the disc connecting column (22) and the connecting head (23) are integrally formed. 8. The cut-off check valve according to claim 3, characterized in that, the length of the disc connecting post (22) is not greater than the depth of the connecting post hole (11). 9. The cut-off check valve according to claim 3, characterized in that, the disc plate (21) is a circular plate, and the disc connecting column (22) is arranged on the disc plate (21) central location. 10. The cut-off check valve according to claim 1, characterized in that, the valve stem (1) is connected with a bonnet (5), and the bonnet (5) is threaded with the valve seat (3) connected; one end of the bonnet (5) is provided with a hand wheel (6); the valve seat (3) is provided with a disc placement surface (33), and when the valve stem (1) is in a squeezed state, The valve stem (1) can press the valve disc (2) on the valve disc placement surface (33).