CN-121977093-A - Pressure-adjustable stop check valve

CN121977093ACN 121977093 ACN121977093 ACN 121977093ACN-121977093-A

Abstract

The invention provides a pressure-adjustable stop check valve, which comprises a valve body, a valve cover, an upper pressing plate, a stand column, a spring lower seat and a spring upper seat, wherein the valve body is provided with a water inlet side and a water outlet side, a communication port is formed between the water inlet side and the water outlet side, one end of a valve rod is inserted into the valve body, a valve disc is fixed at one end of the valve rod and used for blocking or loosening the communication port, the valve cover is blocked at the top of the valve body, the valve rod penetrates through the valve cover and stretches into the valve body, the two ends of the stand column are respectively fixed on the upper pressing plate and the valve cover, the spring lower seat and the spring upper seat can move along the stand column, the two ends of the spring are propped against the spring lower seat and the spring upper seat, a jackscrew is arranged on the valve rod so as to be clamped below the spring lower seat, and the spring upper seat is propped against the upper pressing plate so that the spring provides downward pre-tightening force for the valve rod. The valve disc is opened and naturally falls down by providing the pretightening force through the spring, the blocking communication port realizes non-return, and the technical problem that a structure for preventing medium from flowing reversely is lacked in the prior art is solved.

Inventors

XIA MING
KONG WEIAN
LIU YANGPENG
JIN NING
WANG MEIXUAN
HU SEN
WANG YINYING
FAN CHENGYU
YU YAO
Shen Dielin

Assignees

上海沪东造船阀门有限公司

Dates

Publication Date: 20260505
Application Date: 20260128

Claims (10)

1. A pressure-adjustable stop check valve, characterized in that the pressure-adjustable stop check valve comprises: A valve body (1) which is provided with a water inlet side (101) and a water outlet side (102), wherein a communication port (103) is arranged between the water inlet side (101) and the water outlet side (102); A valve rod (4) having one end inserted into the valve body (1); a valve disc (3) fixed to the one end of the valve stem (4) and closing or releasing the communication port (103); A valve cover (5) which is blocked at the top of the valve body (1), wherein the valve rod (4) penetrates through the valve cover (5) and stretches into the valve body (1); An upper platen (14); The two ends of the upright post (10) are respectively fixed on the upper pressing plate (14) and the valve cover (5); A lower spring seat (11) and an upper spring seat (13), wherein the lower spring seat (11) and the upper spring seat (13) can move along the upright post (10); The two ends of the spring (12) are propped against the spring lower seat (11) and the spring upper seat (13), a jackscrew (26) is arranged on the valve rod (4) to be clamped below the spring lower seat (11), and the spring upper seat (13) is propped below the upper pressing plate (14), so that the spring (12) provides downward pretightening force for the valve rod (4).
2. The adjustable pressure shut-off check valve of claim 1, further comprising: The packing gland (7) is arranged on the valve cover (5) and sleeved on the valve rod (4), a plurality of layers of packing (19) are arranged between the packing gland (7) and the valve cover (5), and a packing box (6) is arranged on the lowest layer; And the two ends of the double-end stud (8) are respectively fixed with the packing gland (7) and the valve cover (5).
3. The pressure-adjustable stop check valve according to claim 2, characterized in that one end of the stud (8) is fixed on the valve cover (5) through a threaded hole, and the other end of the stud (8) is fixed on the packing gland (7) through the stud nut (9).
4. A pressure-adjustable stop check valve according to claim 3, characterized in that the valve cap (5) is fixed to the valve body (1) by means of a cap stud (20), a cap nut (21) and a cap washer (22).
5. The pressure-adjustable stop check valve according to claim 4, characterized in that the top of the valve rod (4) is provided with a hand wheel (23) and is fixed (25) by a hand wheel gasket (24) and a hand wheel nut.
6. The adjustable pressure check valve as set forth in claim 5, further comprising: a threaded post (28) having one end secured through the upper platen (14) and secured by the lock nut (17) at the top of the threaded post (28).
7. The pressure-adjustable stop check valve of claim 6, wherein a top nut (18) is disposed above the threaded post (28).
8. The pressure-adjustable stop check valve according to claim 7, characterized in that the communication port (103) is located on the valve seat (2).
9. The pressure-adjustable stop check valve according to claim 8, characterized in that the top of the post (10) is fixed (16) by means of a washer (15) and a post nut.
10. The pressure-adjustable stop check valve according to claim 9, characterized in that a retainer ring (27) is also provided on the jackscrew (26).

Description

Pressure-adjustable stop check valve Technical field: The invention relates to the technical field of check valve structural design, in particular to a pressure-adjustable stop check valve. The background technology is as follows: in the flowing process of the pipeline medium, the pipeline pressure is acted, so that the medium flows under the action of certain pressure, and according to the working principle requirement of a pipeline system, a valve for stopping or stopping is arranged in the pipeline, so that the medium flows unidirectionally, and the stopping function can prevent the medium from flowing backwards. In some pipelines with pressure requirements, the unidirectional flow pressure of the medium needs to be limited, for example, when the medium reaches a certain pressure, the stop check valve can be automatically opened to allow the medium to flow, and when the pressure is lower than the certain pressure, the stop check valve is automatically closed, the medium is not circulated any more, and the reverse flow of the medium behind the valve is prevented. In order to realize the function, a stop check valve capable of adjusting the medium circulation pressure is needed to realize the function, and the invention designs the pressure-adjustable stop check valve for the use situation. There is a strong need for a pressure-adjustable stop check valve that helps to solve the technical problem of the lack of a check valve structure that prevents reverse flow of media in the prior art. The invention comprises the following steps: In an embodiment, the invention provides the pressure-adjustable stop check valve, the valve disc naturally falls after being opened by providing the pretightening force through the spring, and the check is realized by blocking the communication port, so that the technical problem of lacking a check valve structure for preventing medium from flowing reversely in the prior art is solved. The pressure-adjustable stop check valve includes: the valve body is provided with a water inlet side and a water outlet side, and a communication port is arranged between the water inlet side and the water outlet side; A valve rod having one end inserted into the valve body; a valve disc fixed to the one end of the valve stem and blocking or unblocking the communication port; the valve rod penetrates through the valve cover and extends into the valve body; An upper press plate; the two ends of the upright post are respectively fixed on the upper pressing plate and the valve cover; The spring lower seat and the spring upper seat can move along the upright post; the two ends of the spring are propped against the spring lower seat and the spring upper seat, a jackscrew is arranged on the valve rod to be clamped below the spring lower seat, and the spring upper seat is propped against the lower part of the upper pressing plate, so that the spring provides a downward pretightening force for the valve rod. In one embodiment, the adjustable pressure shut-off check valve further comprises: The packing gland is arranged on the valve cover and sleeved on the valve rod, a plurality of layers of packing are arranged between the packing gland and the valve cover, and a packing box is arranged at the lowest layer; And the two ends of the double-end stud are respectively fixed with the packing gland and the valve cover. In one embodiment, one end of the double-ended stud is fixed on the valve cover through a threaded hole, and the other end of the double-ended stud is fixed on the packing gland through the stud nut. In one embodiment, the valve cap is secured to the valve body by a cap stud, a cap nut, and a cap washer. In one embodiment, the top of the valve rod is provided with a hand wheel and is fixed by a hand wheel gasket and a hand wheel nut. In one embodiment, the adjustable pressure shut-off check valve further comprises: And one end of the threaded column penetrates through the upper pressing plate to be fixed, and is fixed through the locking nut, and the top of the threaded column is provided with the threaded column. In one embodiment, a top nut is disposed above the threaded post. In one embodiment, the communication port is located on the valve seat. In one embodiment, the top of the column is secured by a washer and column nut. In one embodiment, a retainer ring is also provided on the jackscrew. Description of the drawings: FIG. 1 is a schematic diagram of a pressure-adjustable stop check valve according to an embodiment of the present invention; FIG. 2 is a schematic view of a valve body according to another embodiment of the present invention; FIG. 3 is a schematic view of a valve cover according to another embodiment of the present invention; FIG. 4 is a schematic illustration of a valve stem according to another embodiment of the present invention; FIG. 5 is a schematic diagram of a stuffing box according to another embodiment of the present invention; FIG. 6 is a schematic view of a packi