Swing type self-sealing check valve

Abstract

The utility model discloses a swing type self-sealing check valve, which relates to the technical field of valves and comprises a valve body, a rocker, a valve clack, a valve seat and a self-sealing valve cover, the rocker, the valve clack and the valve seat are arranged in the valve body, the self-sealing valve cover is arranged on the valve body, a rocker fork and a rocker fork mounting seat are arranged in the valve body, and the rocker fork comprises a connecting portion and an extending portion. The connecting part is fixed on the rocker fork mounting seat through a bolt, the extension part is provided with a pin shaft, one end of the rocker is hinged to the pin shaft, the other end of the rocker is connected with the valve clack, the rocker fork mounting seat is provided with a limiting groove, the connecting part is provided with a limiting protrusion matched with the limiting groove, and a limiting block is arranged above the rocker fork mounting seat. When the bolt is loosened, the rocking fork cannot be separated from the rocking fork mounting seat, and safety and reliability are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a swing-type self-sealing check valve. Background Art

[0002] Swing check valve is also called one-way valve or non-return valve. Its function is to prevent the backflow of medium in the pipeline. Swing check valve is generally installed horizontally in the pipeline. Swing check valve is divided into two types: external rocker arm swing structure and internal rocker arm swing structure. All opening and closing parts of the internal rocker arm swing structure valve are installed inside the valve body and do not penetrate the valve body. Except for the sealing gasket and sealing ring in the middle flange, there is no external leakage point as a whole. Therefore, the internal rocker arm swing structure is usually used under high pressure conditions.

[0003] The existing built-in rocker arm swing check valve generally includes a valve body, a rocker arm arranged in the valve body, a valve disc, a valve seat and a self-sealing valve cover arranged on the valve body. A rocker fork and a rocker fork mounting seat are arranged in the valve body. The rocker fork is fixed to the rocker fork mounting seat by bolts. A pin is arranged at the lower end of the rocker fork. One end of the rocker arm is hinged to the pin, and the other end is connected to the valve disc. Since the swing check valve is prone to vibration during the opening and closing process, the bolts are prone to loosening due to vibration and medium impact. In severe cases, the rocker fork may be separated from the rocker fork mounting seat, thereby causing the valve disc to fall into the channel and cause an accident. Summary of the invention

[0004] In view of the deficiencies in the prior art, the utility model provides a swing-type self-sealing check valve.

[0005] The technical solution provided by the utility model is:

[0006] A swing-type self-sealing check valve comprises a valve body, a rocker arm, a valve disc, a valve seat and a self-sealing valve cover arranged in the valve body, the valve body is provided with a rocker fork and a rocker fork mounting seat, the rocker fork comprises a connecting portion and an extending portion, the connecting portion is fixed to the rocker fork mounting seat by bolts, the extending portion is provided with a pin shaft, one end of the rocker arm is hinged to the pin shaft, and the other end is connected to the valve disc, the rocker fork mounting seat is provided with a limiting groove, the connecting portion is provided with a limiting protrusion matching the limiting groove, and a limiting block is provided above the rocker fork mounting seat.

[0007] The groove walls on both sides of the limiting groove are inclined surfaces, and the outer side of the limiting groove close to the inner wall of the valve body is provided with an arc inclined surface for facilitating the installation of the rocking fork.

[0008] A gap is provided between the upper end of the connecting portion and the limiting block, and the gap is smaller than the depth of the limiting groove.

[0009] The valve flap is provided with a valve flap shaft, the valve flap is connected to a rocker through a nut, the outer surface of the shaft neck of the valve flap shaft is spherical, and there is a gap between the nut and the rocker.

[0010] A limit stopper is arranged in the valve body, and a protrusion is arranged at the rear end of the rocker lever corresponding to the limit stopper.

[0011] The self-sealing valve cover includes a cover plate, a floating valve cover and four open rings. The cover plate and the valve body are connected by threads. The floating valve cover is arranged in the valve body and connected to the cover plate by bolts. The four open rings are arranged between the cover plate and the floating valve cover and are clamped on the valve body. A pressure ring and a self-tightening gasket are provided between the four open rings and the floating valve cover.

[0012] The cover plate is provided with a lifting screw on the side facing away from the floating valve cover.

[0013] The beneficial effects of the utility model are as follows: the utility model arranges a limit groove on the rocking fork mounting seat, arranges a limit protrusion matching the limit groove on the rocking fork, and arranges a limit block above the rocking fork mounting seat. Even if the bolt is loose, the limit groove, the limit protrusion and the limit block ensure that the rocking fork will not separate from the rocking fork mounting seat, which is safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic cross-sectional structure diagram of an embodiment of the utility model;

[0015] Figure 2 for Figure 1 A partial enlarged view of . DETAILED DESCRIPTION

[0016] The embodiments of the present utility model will be further described below in conjunction with the accompanying drawings.

[0017] like Figure 1-2 As shown, a swing type self-sealing check valve comprises a valve body 1, a rocking lever 4 arranged in the valve body 1, a valve disc 3, a valve seat 2 and a self-sealing valve cover arranged on the valve body, a rocking fork 8 and a rocking fork mounting seat 22 are arranged in the valve body, the rocking fork 8 comprises a connecting portion 81 and an extending portion 82, the connecting portion 81 is fixed to the rocking fork mounting seat 22 by a bolt 9, the extending portions 82 are two and extend downward from both ends of the connecting portion 81 respectively, a pin shaft 7 is arranged between the lower ends of the two extending portions 82, One end of the rocker arm 4 is hinged to the pin shaft 7, and the other end is connected to the valve disc 3. The rocker fork mounting seat 22 is provided with a limiting groove 23. The groove walls on both sides of the limiting groove 23 are inclined surfaces. The outer side of the limiting groove 23 close to the inner wall of the valve body is provided with an arc inclined surface 84. The connecting part 81 is provided with a limiting protrusion 83 matching the limiting groove 23. A limiting block 85 is provided above the rocker fork mounting seat 22. A gap is provided between the upper end of the connecting part 81 and the limiting block 85, and the gap is smaller than the depth of the limiting groove 23.

[0018] When assembling the rocking fork 8, first tilt the rocking fork 8 counterclockwise so that the side of the rocking fork is aligned with the arc inclined surface 84, and the left inclined surface of the limiting protrusion 83 is against the left inclined wall of the limiting groove 23, and then rotate the rocking fork 8 clockwise to straighten it so that the limiting protrusion 83 is completely limited in the limiting groove 23, and finally fix the rocking fork 8 to the rocking fork mounting seat 22 by the bolt 9. Even if the bolt 9 is loose, the limiting groove 23, the limiting protrusion 83, and the limiting block 85 cooperate to ensure that the rocking fork will not fall off the rocking fork mounting seat 22, which is safe and reliable.

[0019] In this embodiment, the valve disc 3 is provided with a valve disc shaft 5, and the valve disc 3 is connected to the rocker 4 through a nut 6. The outer surface of the shaft neck of the valve disc shaft 5 is spherical, and there is a gap between the nut 6 and the rocker 4. The valve disc shaft 5 can move axially, and the valve disc 3 can swing slightly. There is an inclination deviation angle between the valve disc 3 and the rocker 4. When the input of the medium stops, the valve disc 3 falls due to its own gravity, which avoids the direct collision between the valve disc 3 and the valve seat 2, thereby extending the service life of the valve.

[0020] A limit stopper 17 is provided in the valve body 1, and a protrusion 41 is provided at the tail end of the rocker arm 4 corresponding to the limit stopper. When the valve disc 3 is lifted upward by the impact of the medium, the limit stopper 17 cooperates with the protrusion 41 to prevent the valve disc 3 from hitting the valve body due to excessive medium flow, thereby extending the service life of the valve.

[0021] In this embodiment, the self-sealing valve cover includes a cover plate 10, a floating valve cover 14 and a four-open ring 11. The cover plate 10 and the valve body 1 are connected by threads. The floating valve cover 14 is arranged in the valve body 1 and connected to the cover plate 10 by bolts 15. The four-open ring 11 is arranged between the cover plate 10 and the floating valve cover 14 and is clamped on the valve body 1. A pressure ring 12 and a self-tightening gasket 13 are arranged between the four-open ring 11 and the floating valve cover 14. The cover plate 10 is provided with a lifting screw 16 on the side away from the floating valve cover 14 to facilitate the fixing of the valve. When the check valve body is in a closed state, the medium pressure pushes the floating valve cover 14, so that the floating valve cover 14 presses the pressure ring 12 and the self-tightening gasket 13, thereby enhancing the sealing effect between the floating valve cover 14 and the four-open ring 11. The greater the pressure inside the check valve body, the better the sealing effect between the floating valve cover 14 and the four-open ring 11, thereby achieving self-sealing.

[0022] The embodiments should not be regarded as limiting the present invention, and any non-creative improvements made based on the spirit of the present invention should be regarded as falling within the protection scope of the present invention.

Claims

1. A swing type self-sealing check valve, comprising a valve body, a rocker arranged in the valve body, a valve disc, a valve seat and a self-sealing valve cover arranged on the valve body, wherein a rocker fork and a rocker fork mounting seat are arranged in the valve body, wherein the rocker fork comprises a connecting portion and an extending portion, wherein the connecting portion is fixed to the rocker fork mounting seat by bolts, wherein the extending portion is provided with a pin shaft, wherein one end of the rocker is hinged to the pin shaft, and the other end is connected to the valve disc, wherein the rocker fork comprises a connecting portion and an extending portion, wherein the connecting portion is fixed to the rocker fork mounting seat by bolts, wherein the extending portion is provided with a pin shaft, wherein one end of the rocker fork is hinged to the pin shaft, and the other end is connected to the valve disc, wherein the rocker fork comprises a connecting portion and an extending portion, wherein the connecting portion is fixed to the rocker fork mounting seat by bolts, wherein the extending portion is provided with a pin shaft, wherein the rocker fork comprises a connecting portion and an extending portion, wherein the connecting portion is fixed to the rocker fork mounting seat by bolts, wherein the extending portion is provided with a pin shaft, wherein the rocker fork comprises a connecting portion and an extending portion, wherein the connecting portion is fixed to the rocker fork mounting seat by bolts, wherein the connecting portion is fixed to the rocker fork mounting seat by bolts, wherein the extending portion is provided with a pin shaft, wherein the rocker fork comprises a connecting portion and an extending portion ... The rocking fork mounting seat is provided with a limiting groove, the connecting portion is provided with a limiting protrusion matched with the limiting groove, and a limiting block is provided above the rocking fork mounting seat.

2. A swing type self-sealing check valve according to claim 1, characterized in that: The groove walls on both sides of the limiting groove are inclined surfaces, and the outer side of the limiting groove close to the inner wall of the valve body is provided with an arc inclined surface for facilitating the installation of the rocking fork.

3. A swing type self-sealing check valve according to claim 2, characterized in that: A gap is provided between the upper end of the connecting portion and the limiting block, and the gap is smaller than the depth of the limiting groove.

4. A swing type self-sealing check valve according to claim 1, characterized in that: The valve flap is provided with a valve flap shaft, the valve flap is connected to a rocker through a nut, the outer surface of the shaft neck of the valve flap shaft is spherical, and there is a gap between the nut and the rocker.

5. The swing type self-sealing check valve according to claim 1, characterized in that: A limit stopper is arranged in the valve body, and a protrusion is arranged at the rear end of the rocker lever corresponding to the limit stopper.

6. A swing type self-sealing check valve according to claim 1, characterized in that: The self-sealing valve cover includes a cover plate, a floating valve cover and four open rings. The cover plate and the valve body are connected by threads. The floating valve cover is arranged in the valve body and connected to the cover plate by bolts. The four open rings are arranged between the cover plate and the floating valve cover and are clamped on the valve body. A pressure ring and a self-tightening gasket are provided between the four open rings and the floating valve cover.

7. A swing type self-sealing check valve according to claim 6, characterized in that: The cover plate is provided with a lifting eye screw on the side facing away from the floating valve cover.

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