Pressure balance type plug valve

Abstract

The utility model belongs to the technical field of pressure balance type plug valves, and discloses a pressure balance type plug valve which comprises a valve body, a conical plug valve core and a valve rod, the upper end face of the valve body is connected with a valve cover through a bolt, the upper end face of the valve cover is connected with a sealing cover through a bolt, and an upper balance cavity and a lower balance cavity are arranged in the valve body. A conical plug valve element is installed between the upper balance cavity and the lower balance cavity, a connecting channel communicated with the upper balance cavity and the lower balance cavity is formed in the conical plug valve element, a sealing groove is formed in the bottom of the lower balance cavity, a containing groove is formed in the bottom of the sealing groove, a through groove is formed in the bottom of the containing groove, a liquid discharging pipe is movably connected into the through groove, and a liquid discharging groove is formed in the liquid discharging pipe. The top end of the liquid discharging pipe penetrates through the bottom of the containing groove to be provided with a mounting block, and a plurality of inlets are formed in the periphery of the mounting block. According to the device, the situation that the pressure in the plug valve device is unbalanced due to the fact that fluid enters the lower balance cavity can be effectively reduced, and then normal opening and closing of the conical plug valve element are facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of pressure-balanced plug valves, and more specifically, relates to a pressure-balanced plug valve. Background Art

[0002] The pressure-balanced plug valve is provided with through holes leading to the pressure-balancing chamber at the top and bottom ends respectively at the flow channel of the tapered plug valve core. When the pressure in the valve body pipeline enters the plug flow channel, the tapered plug valve core is pushed downward under the action of the pressure difference, forming a conical surface seal.

[0003] However, during the long-term closing and opening process of the tapered plug valve, the fluid in the pipeline can easily enter the pressure balance chamber, causing the volume of the pressure balance chamber to decrease, resulting in pressure imbalance in the valve body, thereby affecting the normal opening and closing of the tapered plug valve core.

[0004] Therefore, in view of this, the existing structure and defects are studied and improved, and a pressure-balanced plug valve is provided in order to achieve a purpose with greater practical value. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a pressure-balanced plug valve, which is achieved by the following specific technical means:

[0006] When unclamping said control button, under the effect of the compression spring and the bubble holding vessel internal pressure that shaves, combine closely in the interior edge of valve gap and sealing load chamber, and closure is mounted on the support frame, and the support frame of interior edge of valve is mounted on the support frame.

[0007] Furthermore, the bottom end surface of the valve stem is provided with a connecting groove, a limit block is movably connected in the connecting groove, the bottom end surface of the limit block is installed with a connecting block, the bottom end surface of the connecting block is connected to the upper end surface of the tapered plug valve core, and the upper end surface of the valve stem is installed with a handle.

[0008] Furthermore, a plug is connected to the bottom of the drainage pipe.

[0009] Furthermore, a stopper is installed on the periphery of the drain pipe.

[0010] Furthermore, a rotating block is installed at one end of the threaded rod away from the arc-shaped clamping block.

[0011] Furthermore, the size of the arc-shaped clamping block matches the size of the drain pipe, and the upper end surface of the arc-shaped clamping block fits with the bottom end surface of the valve body.

[0012] Furthermore, the top of the drainage trough extends into the mounting block and is communicated with the plurality of inlets.

[0013] Furthermore, the sealing block is made of rubber.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] Through the coordinated use of the inlet, drain pipe, drain trough, rotating block, clamping block, threaded rod and arc clamping block, when the fluid in the pipeline enters the lower balancing chamber and causes the volume in the lower balancing chamber to become smaller, the staff closes the plug valve device and then rotates the rotating block. The rotating block drives the threaded rod to rotate. Since the threaded rod is threadedly connected to the support block, the arc clamping block is driven to move to one side and disengage from the drain pipe when the threaded rod rotates. At this time, the staff takes out the plug at the bottom of the drain pipe and then pushes the mounting block upward through the drain pipe. When the mounting block moves to the position of the sealing groove, the fluid flows into the sealing groove, and then enters the drain trough from the inlet and is discharged from the drain trough, thereby effectively reducing the situation where the fluid enters the lower balancing chamber and causes pressure imbalance in the plug valve device, thereby facilitating the normal opening and closing of the tapered plug valve core, thereby improving the use effect of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional schematic diagram of the utility model.

[0017] Figure 2 It is a formal cross-sectional schematic diagram of the utility model.

[0018] Figure 3 It is a three-dimensional schematic diagram of part of the mechanism of the utility model.

[0019] Figure 4 It is a partial structural stereoscopic diagram of the utility model.

[0020] Figure 5 This utility model Figure 2 A is an enlarged schematic diagram.

[0021] Figure 6 This utility model Figure 2 A magnified schematic diagram of B.

[0022] In the figure, the corresponding relationship between the component names and the drawing numbers is as follows:

[0023] 1. Valve body; 101. Upper balancing chamber; 102. Lower balancing chamber; 2. Tapered plug valve core; 201. Connecting block; 202. Limit block; 3. Valve stem; 301. Connecting groove; 302. Handle; 4. Valve cover; 401. Sealing cover; 5. Sealing groove; 501. Placement groove; 502. Through groove; 6. Drain pipe; 601. Drain groove; 602. Stop block; 7. Mounting block; 701. Inlet; 8. Support block; 801. Threaded rod; 802. Arc block; 803. Rotating block; 9. Plug; 10. Sealing block. DETAILED DESCRIPTION

[0024] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0025] In the description of this utility model, unless otherwise specified, "plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction, and therefore should not be construed as limiting this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0027] Example:

[0028] As attached Figure 1 To the attached Figure 6 As shown:

[0029] The utility model provides a pressure balanced plug valve, including a valve body 1, a tapered plug valve core 2 and a valve stem 3. The upper end surface of the valve body 1 is connected to a valve cover 4 by bolts, and the upper end surface of the valve cover 4 is connected to a sealing cover 401 by bolts. An upper balancing chamber 101 and a lower balancing chamber 102 are provided in the valve body 1. A tapered plug valve core 2 is installed between the upper balancing chamber 101 and the lower balancing chamber 102. A connecting channel connecting the upper balancing chamber 101 and the lower balancing chamber 102 is provided in the tapered plug valve core 2. A sealing groove 5 is provided at the bottom of the lower balancing chamber 102. The bottom of the sealing groove 5 is provided with a sealing groove for placing Groove 501, a through groove 502 is provided at the bottom of the placement groove 501, a drain pipe 6 is movably connected in the through groove 502, a drain groove 601 is provided in the drain pipe 6, the top of the drain pipe 6 passes through the bottom of the placement groove 501 and is installed with a mounting block 7, a plurality of inlets 701 are provided on the periphery of the mounting block 7, the top of the mounting block 7 passes through the bottom of the sealing groove 5 and is installed with a sealing block 10, a support block 8 is installed on the side of the bottom end face of the valve body 1 close to the drain pipe 6, a threaded rod 801 is threadedly connected to one side of the support block 8, and an arc-shaped clamping block 802 is rotatably connected to one end of the threaded rod 801.

[0030] Among them, the bottom end surface of the valve stem 3 is provided with a connecting groove 301, and the limiting block 202 is movably connected in the connecting groove 301. The bottom end surface of the limiting block 202 is installed with a connecting block 201. The bottom end surface of the connecting block 201 is connected to the upper end surface of the tapered plug valve core 2. The upper end surface of the valve stem 3 is installed with a handle 302. The tapered plug valve can be rotated by the handle 302, thereby controlling the opening and closing of the plug valve device.

[0031] The bottom of the drain pipe 6 is connected to a plug 9 , which can block the drain pipe 6 .

[0032] A stopper 602 is installed on the periphery of the drain pipe 6 , and the stopper 602 can play a limiting role when the arc-shaped clamping block 802 clamps the drain pipe 6 .

[0033] Among them, a rotating block 803 is installed at one end of the threaded rod 801 away from the arc-shaped clamping block 802, and the threaded rod 801 is driven to rotate by the rotating block 803. Since the threaded rod 801 is threadedly connected to the support block 8, the arc-shaped clamping block 802 is moved to one side when the threaded rod 801 rotates.

[0034] Among them, the size of the arc-shaped clamping block 802 matches the size of the drain pipe 6, the upper end surface of the arc-shaped clamping block 802 fits with the bottom end surface of the valve body 1, and when the threaded rod 801 rotates, the arc-shaped clamping block 802 drives the arc-shaped clamping block 802 to move forward, so that the arc-shaped clamping block 802 clamps the drain pipe 6 and fixes it.

[0035] The top of the drainage trough 601 extends into the mounting block 7 and is connected to a plurality of inlets 701 . The fluid enters the drainage trough 601 through the inlets 701 and is discharged from the drainage trough 601 .

[0036] The sealing block 10 is made of rubber and can provide a sealing effect when it enters the sealing groove 5 .

[0037] The working principle of this embodiment is as follows:

[0038] When the fluid in the pipeline enters the lower balancing chamber 102, causing the volume in the lower balancing chamber 102 to become smaller, the staff closes the stopcock device and then rotates the rotating block 803. The rotating block 803 drives the threaded rod 801 to rotate. Since the threaded rod 801 is threadedly connected to the support block 8, the threaded rod 801 drives the arc-shaped clamping block 802 to move to one side and disengage from the drain pipe 6 when it rotates. At this time, the staff removes the plug 9 at the bottom of the drain pipe 6 and then pushes the mounting block 7 upward through the drain pipe 6. When the mounting block 7 moves to the position of the sealing groove 5, the fluid flows into the sealing groove 5, and then enters the drain groove 601 from the inlet 701 and is discharged from the drain groove 601.

[0039] The embodiments of the present invention are provided for purposes of illustration and description and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for specific applications.

Claims

1. A pressure-balanced plug valve, comprising a valve body (1), a tapered plug valve core (2) and a valve stem (3), wherein the upper end surface of the valve body (1) is connected to a valve cover (4) by bolts, and the upper end surface of the valve cover (4) is connected to a sealing cover (401) by bolts, wherein an upper balancing chamber (101) and a lower balancing chamber (102) are provided in the valve body (1), a tapered plug valve core (2) is installed between the upper balancing chamber (101) and the lower balancing chamber (102), and a connecting channel is provided in the tapered plug valve core (2) for communicating with the upper balancing chamber (101) and the lower balancing chamber (102), and wherein: The bottom of the lower balancing chamber (102) is provided with a sealing groove (5), the bottom of the sealing groove (5) is provided with a placement groove (501), the bottom of the placement groove (501) is provided with a through groove (502), a drain pipe (6) is movably connected in the through groove (502), a drain groove (601) is provided in the drain pipe (6), the top end of the drain pipe (6) passes through the bottom of the placement groove (501) and is installed with a mounting block (7), the periphery of the mounting block (7) is provided with a plurality of inlets (701), the top end of the mounting block (7) passes through the bottom of the sealing groove (5) and is installed with a sealing block (10), the bottom end face of the valve body (1) is provided with a support block (8) on the side close to the drain pipe (6), one side of the support block (8) is threadedly connected to a threaded rod (801), and one end of the threaded rod (801) is rotatably connected to an arc-shaped clamping block (802).

2. The pressure-balanced plug valve according to claim 1, characterized in that: The bottom end surface of the valve stem (3) is provided with a connecting groove (301), a limit block (202) is movably connected in the connecting groove (301), the bottom end surface of the limit block (202) is installed with a connecting block (201), the bottom end surface of the connecting block (201) is connected to the upper end surface of the tapered plug valve core (2), and the upper end surface of the valve stem (3) is installed with a handle (302).

3. The pressure-balanced plug valve according to claim 1, wherein: The bottom of the drainage pipe (6) is connected with a plug (9).

4. The pressure-balanced plug valve according to claim 1, wherein: A stopper (602) is installed on the periphery of the liquid discharge pipe (6).

5. The pressure-balanced plug valve according to claim 1, characterized in that: A rotating block (803) is installed at one end of the threaded rod (801) away from the arc-shaped clamping block (802).

6. The pressure-balanced plug valve according to claim 1, wherein: The size of the arc-shaped clamping block (802) matches the size of the liquid discharge pipe (6), and the upper end surface of the arc-shaped clamping block (802) fits with the bottom end surface of the valve body (1).

7. The pressure-balanced plug valve according to claim 1, wherein: The top of the drainage trough (601) extends into the mounting block (7) and is in communication with the plurality of inlets (701).

8. The pressure-balanced plug valve according to claim 1, wherein: The sealing block (10) is made of rubber.

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