CN219221372U

CN219221372U - Small-caliber Y-shaped stop check valve

Info

Publication number: CN219221372U
Application number: CN202223506455.XU
Authority: CN
Inventors: 张娜; 陈文鑫; 郝宏达; 蒋亚琴; 张琳; 董霞; 陆钰珍; 魏永忠; 张国锋; 哈华锋; 王亚龙
Original assignee: LANZHOU HIGH PRESSURE VALVE CO Ltd
Current assignee: LANZHOU HIGH PRESSURE VALVE CO Ltd
Priority date: 2022-12-28
Filing date: 2022-12-28
Publication date: 2023-06-20
Anticipated expiration: 2032-12-28

Abstract

The small-caliber Y-shaped stop check valve comprises a valve body, a valve rod and a valve clack, a stuffing box, a sealing ring and a bracket, wherein the valve body is connected with the bracket; the valve clack is in a piston form, and a guide groove is formed in the piston; after the anti-rotation pin and the anti-rotation hole of the valve rod head are assembled, the two ends of the anti-rotation pin penetrate through the guide groove on the valve clack and then are stretched into the anti-rotation groove on the inner cavity of the valve body; the stuffing box is lifted by screwing the locking nut threads. The utility model is suitable for the working condition that the installation position is limited, solves the problem that the valve rod of the small-caliber Y-shaped stop check valve is required to only lift and not rotate through the anti-rotation structure arranged in the valve cavity, and meets the function of dual purposes of one valve; meanwhile, the problems that the space of the small-caliber Y-shaped stop check valve is too small, an anti-rotation structure cannot be installed or the installation is heavy and uncoordinated are solved.

Description

Small-caliber Y-shaped stop check valve

Technical Field

The utility model relates to the technical field of valve manufacturing, in particular to a small-caliber Y-shaped stop check valve capable of cutting off fluid and playing a role in stopping return.

Background

The working principle of the stop check valve in the process of acting and stopping is the same as that of the lifting check valve. When the valve is closed, the valve rod moves downwards to push the valve clack, so that the valve plays a role in closing the stop valve. When the valve is opened, the valve rod is separated from the valve clack, the valve clack can move up and down along the valve rod, and the valve clack is equivalent to a lifting check valve at the moment. In order to meet the requirement that the valve rod only needs to be lifted and cannot rotate, an anti-rotation mechanism can be designed outside the support and the valve rod for some large-caliber stop check valves, and the support is provided with a flange type bolt connection structure, but the anti-rotation mechanism is heavy and occupies space, and the anti-rotation mechanism cannot be installed in some small-caliber valve spaces, and the heavy anti-rotation structure and the small-caliber valve have the problem of light weight.

Disclosure of Invention

The utility model provides a small-caliber Y-shaped stop check valve, which solves the problem that a valve rod of the small-caliber Y-shaped stop check valve is required to be lifted and not rotated without an external rotation prevention mechanism.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the small-caliber Y-shaped stop check valve comprises a valve body, a valve rod and a valve clack, a stuffing box, a sealing ring and a bracket, wherein the valve body is connected with the bracket; the valve clack is in a piston form, and a guide groove is formed in the piston; after the anti-rotation pin and the anti-rotation hole of the valve rod head are assembled, the two ends of the anti-rotation pin penetrate through the guide groove on the valve clack and then are stretched into the anti-rotation groove on the inner cavity of the valve body; the stuffing box is lifted by screwing the locking nut threads.

The guide groove is rectangular, and the distance between the upper edge of the rectangle and the top of the valve clack is 10 mm.

The width of the guide groove is larger than that of the anti-rotation groove on the inner cavity of the valve body.

The head of the valve rod is provided with an exhaust balancing groove.

The support is designed into an external thread and is connected with the internal thread of the valve body in a matched mode.

The sealing cone of the sealing ring is 47 degrees, and the sealing cone of the stuffing box is 45 degrees.

The utility model is suitable for the working condition that the installation position is limited, and the anti-rotation mechanism arranged outside at ordinary times is arranged in the valve cavity, so that the problem that the valve rod of the small-caliber Y-shaped stop check valve only needs to be lifted and not rotated is solved; meanwhile, the problems that the space of the small-caliber Y-shaped stop check valve is too small, an anti-rotation structure cannot be installed or the installation is heavy and uncoordinated are solved.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a view from A-A in FIG. 1;

FIG. 3 is a schematic diagram of the structure of the valve clack guide groove of the utility model;

FIG. 4 is a schematic view of the assembly of the valve clack, anti-rotation pin and valve rod of the present utility model.

Detailed Description

The utility model will be described in detail below with reference to the drawings and the detailed description.

Referring to fig. 1-4, a small-caliber Y-shaped stop check valve comprises a valve body 1, a valve rod 2, a valve clack 3, a stuffing box 5, a sealing ring 6 and a bracket 7, wherein the valve body 1 is connected with the bracket 7, the sealing ring 6 is arranged between the bracket 7 and the stuffing box 5, and the small-caliber Y-shaped stop check valve is characterized in that an anti-rotation hole is formed in the head of the valve rod 2; the valve clack 3 is in a piston form, and a guide groove 3-1 is formed in the piston; after the anti-rotation pin 4 and the anti-rotation hole at the head part of the valve rod 2 are assembled, two ends of the anti-rotation pin penetrate through the guide groove 3-1 on the valve clack 3 and then extend into the anti-rotation groove 1-1 on the inner cavity of the valve body to form an anti-rotation mechanism; the stuffing box 5 is screwed and lifted by a locking nut 8.

The anti-rotation pin 4 prevents the problem of difficult sealing caused by the inclination of the valve clack 3 when the valve clack is opened and closed under the action of the medium under the action of the guide groove 3-1.

The anti-rotation groove 1-1 on the valve body 1 is in clearance fit with the anti-rotation pin 4, so that the anti-rotation pin 4 can freely move up and down when the valve is opened and closed; but also can lead the valve to be centered and aligned under the action of the clearance when the valve is closed.

Referring to fig. 3-4, the guide groove 3-1 has a rectangular shape, and the upper edge of the rectangle is spaced 10mm from the top of the valve flap 3. The allowance of 10mm can prevent the deformation of the valve clack under the action of the medium. But also limits the incomplete disengagement of the valve stem 2 and the flap 3 when the stop check valve is functioning.

The width of the guide groove 3-1 is larger than that of the anti-rotation groove 1-1 on the inner cavity of the valve body 1. Preventing the valve stem 2 from being able to smoothly disengage from the valve flap 3.

The head of the valve rod 2 is provided with an exhaust balancing groove. And residual pressure at the contact part of the bottom of the valve rod and the valve clack when the quick discharge valve is closed.

The support 7 is designed to be an external thread, the valve body 1 is designed to be an internal thread, and the support external thread is connected with the valve body internal thread in a matched mode. The screw thread type support can be connected with the valve body and can compress the valve sealing ring.

The sealing conical surface of the sealing ring 6 is 47 degrees, and the sealing conical surface of the stuffing box 5 is 45 degrees. When the valve middle cavity is fully pressurized, the degree difference between the conical surface of the stuffing box and the conical surface of the sealing ring is extruded and combined under the action of pressure to seal the middle cavity.

Claims

1. The small-caliber Y-shaped stop check valve comprises a valve body (1), a valve rod (2), a valve clack (3), a stuffing box (5), a sealing ring (6) and a support (7), wherein the valve body (1) is connected with the support (7), the sealing ring (6) is arranged between the support (7) and the stuffing box (5), and the small-caliber Y-shaped stop check valve is characterized in that an anti-rotation hole is formed in the head of the valve rod (2); the valve clack (3) is in a piston form, and a guide groove (3-1) is formed in the piston; after the anti-rotation pin (4) and the anti-rotation hole at the head part of the valve rod (2) are assembled, two ends of the anti-rotation pin penetrate through the guide groove (3-1) on the valve clack (3) and then extend into the anti-rotation groove (1-1) on the inner cavity of the valve body in a clearance way; the stuffing box (5) is screwed and lifted by a locking nut (8).

2. A small-caliber Y-shaped stop check valve according to claim 1, wherein the guide groove (3-1) is rectangular, and the upper edge of the rectangle is 10mm away from the top of the valve flap (3).

3. The small-caliber Y-shaped stop check valve according to claim 1, wherein the width of the guide groove (3-1) is larger than the width of the anti-rotation groove (1-1) on the inner cavity of the valve body (1).

4. The small-caliber Y-shaped stop check valve according to claim 1, wherein: the head of the valve rod (2) is provided with an exhaust balancing groove.

5. The small-caliber Y-shaped stop check valve according to claim 1, wherein: the support (7) is designed into an external thread and is connected with the internal thread of the valve body (1) in a matching way.

6. A small caliber Y-shaped stop check valve according to claim 1 wherein the sealing ring (6) sealing cone is 47 ° and the stuffing box (5) sealing cone is 45 °.