Double-seat sandwich sealing type stop valve

Abstract

The utility model belongs to the technical field of structural improvement of stop valves, and particularly relates to a double-seat sandwich sealing type stop valve, which comprises a valve body, a valve cover, a valve rod and a hand wheel, a medium inlet and a medium outlet are arranged in the valve body, and a valve port is communicated between the medium inlet and the medium outlet. The upper end and the lower end of the valve port are fixedly connected with an upper sealing seat and a lower sealing seat respectively, the valve rod is sleeved with an upper valve clack correspondingly matched with the upper sealing seat, the valve rod is fixedly connected with a pressing block, an inner threaded hole is formed in the bottom of the valve rod, a threaded rod is connected into the inner threaded hole in a threaded mode, the lower end of the threaded rod penetrates through the valve port, and an installation port is formed in the bottom of the valve body. A sealing cover is connected to the corresponding installation opening in a sealed mode, a lower valve clack correspondingly matched with the lower sealing base is connected into the installation opening in a sliding mode in the vertical direction, and an axial limiting assembly and a radial positioning assembly are connected between the lower valve clack and the screw. Two-way sealing and opening of the valve port can be achieved by rotating the hand wheel in a reciprocating mode, operation is easy, and efficiency is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to a double seat sandwich seal type stop valve belongs to stop valve structure improvement technical field. BACKGROUND

[0002] Stop valve, also called stop door, is one of the most widely used valves, the friction between sealing surfaces is small in opening and closing process, is more durable, opening height is not big, is easy to manufacture, is convenient to maintain, is not only suitable for medium and low pressure, but also suitable for high pressure. In the prior art, most of the stop valves are one-way sealed to the valve port, and the closing sealing principle is that the valve rod pressure makes the valve clack sealing surface and the valve seat sealing surface closely adhere to prevent medium flow. In the actual use of the stop valve, sometimes the valve rod pre-tightening force is insufficient due to the large pressure of the medium in the pipeline, so that the valve port cannot be effectively sealed, the valve body is prone to leakage, and the medium cutting capacity is poor.

[0003] Therefore, the utility model discloses a bidirectional sealing type stop valve, which can realize simultaneous sealing of the upper port and the lower port of the valve port. By sealing the lower port of the valve port, the influence of high-pressure medium on the valve rod pre-tightening force can be eliminated, and the greater the pressure, the better the sealing effect of the valve port. At the same time, the bidirectional sealing of the valve port can further improve the sealing effect of the valve port and fully ensure the cutting capacity of the stop valve for medium. However, the opening and closing operations of the upper port and the lower port of the valve port in the above prior art need to be operated separately, and the rotating handle needs to be turned over, so the operation process is relatively complicated, and the opening and closing operation efficiency of the stop valve is low. CONTENT OF THE UTILITY MODEL

[0004] According to the deficiencies in the above prior art, the utility model solves the technical problem of providing a double seat sandwich seal type stop valve with high opening and closing operation efficiency.

[0005] The double seat sandwich seal type stop valve comprises a valve body, a valve cover, a valve rod and a hand wheel, the valve body is provided with a medium inlet and a medium outlet, the medium inlet and the medium outlet are communicated with a valve port, the upper and lower ends of the valve port are respectively fixedly connected with an upper sealing seat and a lower sealing seat, the valve rod is sleeved with an upper valve clack corresponding to the upper sealing seat, the valve rod is fixedly connected with a pressing block, the bottom of the valve rod is provided with an internal thread hole, the internal thread hole is threadedly connected with a screw rod, the lower end of the screw rod penetrates through the valve port, the bottom of the valve body is provided with a mounting port, the mounting port is sealingly connected with a sealing cover corresponding to the mounting port, the mounting port is slidingly connected with a lower valve clack corresponding to the lower sealing seat in the vertical direction, and the lower valve clack and the screw rod are connected with an axial limiting assembly and a radial positioning assembly.

[0006] Further, the bottom of the valve cover is fixedly connected with a sealing valve seat, and the valve rod is provided with a sealing valve clack corresponding to the sealing valve seat.

[0007] Further, the mounting port is provided with a flange, a sealing gasket is connected between the flange and the sealing cover, and the flange and the sealing cover are fixedly connected through a plurality of bolts.

[0008] Further, the inner side wall of the mounting port is provided with a plurality of sliding grooves, and the lower valve clack is provided with a plurality of sliding blocks corresponding to the sliding grooves.

[0009] Further, the radial positioning assembly comprises a positioning groove arranged at the top of the lower valve clack, and the longitudinal section of the positioning groove is an inverted T-shaped, and the lower end of the screw rod corresponds to the positioning groove.

[0010] Further, the radial positioning assembly comprises a positioning pin fixedly connected to the lower valve clack and a positioning hole arranged on the screw rod, and the positioning pin penetrates through the positioning hole and is slidably matched with the positioning hole.

[0011] Working principle and process:

[0012] When the hand wheel is counterclockwise rotated, the valve rod is counterclockwise rotated, at this time, under the cooperation and guidance of the sliding groove and the sliding block, the lower valve clack will not be rotated, and under the cooperation of the positioning pin and the positioning hole, the screw rod will not be rotated, therefore, under the threaded connection of the screw rod and the valve rod, the screw rod moves downward, when the lower end surface of the screw rod is attached to the lower end surface of the positioning groove, the screw rod continues to move downward, which drives the lower valve clack to move downward along the sliding groove, so that the lower valve clack is separated from the lower sealing seat, when the lower valve clack moves to be attached to the sealing cover, the lower valve clack will not move downward any more, therefore, the screw rod will not move downward any more, at this time, the valve rod will be subjected to a reaction force and moves upward in rotation, thus driving the pressing block to move upward and cancel the pressing of the upper valve clack, at this time, under the pressure of the pipeline medium, the medium can enter the valve port through the medium inlet, and the upper valve clack is pushed open to flow out through the medium outlet, so as to realize the opening of the valve; then the valve rod continues to rotate and move upward, and the hand wheel is stopped when the sealing valve clack is attached to the sealing valve seat, at this time, the valve is completely opened; under the sealing action of the sealing valve clack and the sealing valve seat, the medium will not leak from the packing seal layer, effectively eliminating the problem of packing seal layer leakage caused by factors such as medium, temperature and environment; at the same time, since the upper valve clack is movably arranged, it plays a certain anti-backflow role.

[0013] When the hand wheel is clockwise rotated, the valve rod is clockwise rotated, at this time, the valve rod and the screw rod move relative to each other, thus driving the lower valve clack to move upward and be attached to the lower sealing seat to form a sealing unit, and driving the pressing block to move downward to press the upper valve clack on the upper sealing seat, so that the upper valve clack is attached to the upper sealing seat to form a sealing unit, thus completing the bidirectional sealing of the valve port and realizing the closing of the valve.

[0014] The utility model has the beneficial effect that compared with prior art:

[0015] The double-seat sandwich sealing type stop valve has the advantages that bidirectional sealing and opening of the valve port can be realized by reciprocating rotation of the hand wheel, the operation is simple, and the efficiency is high. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the sectional view of the utility model embodiment;

[0017] Figure 2 is Figure 1 the enlarged view of A in figure;

[0018] Figure 3 is Figure 1 the enlarged view of B in figure;

[0019] Figure 4 is Figure 1 the enlarged view of C in figure.

[0020] In the figure: 1, valve body;2, medium inlet;3, medium outlet;4, mounting port;5, sealing cover;6, valve cover;7, valve rod;8, hand wheel;9, screw rod;10, sliding groove;11, sliding block;12, lower valve clack;13, positioning hole;14, positioning pin;15, positioning groove;16, lower sealing seat;17, upper sealing seat;18, upper valve clack;19, pressing block;20, sealing valve seat;21, sealing valve clack;22, internal thread hole;23, flange;24, bolt;25, sealing gasket;26, valve port. DETAILED DESCRIPTION

[0021] The embodiments of the utility model will be further described in combination with the drawings:

[0022] Embodiment 1:

[0023] As Figures 1 to 4 shown, the double-seat sandwich sealing type stop valve comprises a valve body 1, a valve cover 6, a valve rod 7 and a hand wheel 8, the valve body 1 is internally provided with a medium inlet 2 and a medium outlet 3, the medium inlet 2 and the medium outlet 3 are communicated with a valve port 26, the upper and lower ends of the valve port 26 are fixedly connected with an upper sealing seat 17 and a lower sealing seat 16 respectively, the valve rod 7 is sleeved with an upper valve clack 18 corresponding to the upper sealing seat 17, the valve rod 7 is fixedly connected with a pressing block 19, the bottom of the valve rod 7 is provided with an internal thread hole 22, the internal thread hole 22 is threadedly connected with a screw rod 9, the lower end of the screw rod 9 penetrates through the valve port 26, the bottom of the valve body 1 is provided with a mounting port 4, the mounting port 4 is sealingly connected with a sealing cover 5, a lower valve clack 12 corresponding to the lower sealing seat 16 is slidingly connected in the mounting port 4 along the vertical direction, and the lower valve clack 12 and the screw rod 9 are connected with an axial limiting assembly and a radial positioning assembly.

[0024] When the handwheel 8 is rotated counterclockwise, the valve stem 7 rotates counterclockwise. At this time, the lower valve disc 12 will not rotate due to the vertical sliding fit between the lower valve disc 12 and the mounting port 4. Furthermore, the screw 9 will not rotate due to the action of the radial positioning component. Therefore, under the action of the threaded connection between the screw 9 and the valve stem 7, the screw 9 moves downward and, under the action of the axial limiting component, drives the lower valve disc 12 to move downward, causing the lower valve disc 12 to separate from the lower sealing seat 16. When the lower valve disc 12 moves to fit against the sealing cover 5, the lower valve disc 12 no longer moves downward, so the screw 9 also no longer moves downward. At this time, the valve stem 7 will be subjected to a reaction force and move upward during rotation, thus driving the pressure block 19 to move upward and release the pressure on the upper valve disc 18. At this time, under the pressure of the pipeline medium, the medium can enter the valve port 26 through the medium inlet 2 and push open the upper valve disc 18 to flow out through the medium outlet 3, thereby realizing the opening of the valve. At the same time, due to the movable setting of the upper valve disc 18, it plays a certain role in preventing backflow.

[0025] When the handwheel 8 is rotated clockwise, the valve stem 7 rotates clockwise. At this time, the valve stem 7 and the screw 9 move relative to each other, which drives the lower valve disc 12 to move upward and fit with the lower sealing seat 16 to form a sealing unit. It also drives the pressure block 19 to move downward and press the upper valve disc 18 onto the upper sealing seat 17, so that the upper valve disc 18 and the upper sealing seat 17 fit together to form a sealing unit, thereby completing the bidirectional sealing of the valve port 26 and realizing the closure of the valve.

[0026] Example 2:

[0027] like Figures 1 to 4 As shown, based on Example 1,

[0028] Furthermore, a sealing valve seat 20 is fixedly connected to the bottom of the valve cover 6, and a sealing valve disc 21 corresponding to and adapted to the sealing valve seat 20 is provided on the valve stem 7. Under the sealing action of the sealing valve disc 21 and the sealing valve seat 20, the medium will not leak from the packing sealing layer, which can effectively eliminate the problem of packing sealing layer leakage caused by factors such as medium, temperature, and environment.

[0029] Furthermore, the mounting port 4 is provided with a flange 23, and a sealing gasket 25 is connected between the flange 23 and the sealing cover 5. The flange 23 and the sealing cover 5 are fixedly connected by multiple bolts 24. The sealing cover 5 can be disassembled by removing the bolts 24, which facilitates the maintenance and replacement of the lower valve disc 12.

[0030] Furthermore, the inner wall of the mounting port 4 is provided with multiple sliding grooves 10, and the lower valve disc 12 is provided with multiple sliders 11 that correspond to and are adapted to the sliding grooves 10. The lower valve disc 12 can slide directionally relative to the mounting port 4 through the cooperation of the sliding grooves 10 and the sliders 11. The structure is simple and the operation is stable.

[0031] Further, the radial positioning assembly comprises a positioning groove 15 arranged on the top of the lower valve disc 12, the longitudinal section of the positioning groove 15 is an inverted T shape, the lower end of the screw rod 9 is correspondingly matched with the positioning groove 15, and the gap matching between the positioning groove 15 and the screw rod 9 can buffer the torsion when the valve is opened and smoothly drive the lower valve disc 12 to move downward;

[0032] Further, the radial positioning assembly comprises a positioning pin 14 fixedly connected to the lower valve disc 12 and a positioning hole 13 arranged on the screw rod 9, the positioning pin 14 penetrates through the positioning hole 13 and is slidably matched with the positioning hole 13, which on one hand does not affect the relative displacement between the screw rod 9 and the lower valve disc 12 and on the other hand can prevent the relative rotation between the screw rod 9 and the lower valve disc 12.

Claims

1. A double-seat sandwich-sealed gate valve, comprising a valve body (1), a valve cover (6), a valve stem (7), and a handwheel (8), wherein the valve body (1) is provided with a medium inlet (2) and a medium outlet (3), and a valve port (26) is connected between the medium inlet (2) and the medium outlet (3), characterized in that: The upper and lower ends of the valve port (26) are fixedly connected to an upper sealing seat (17) and a lower sealing seat (16), respectively. The valve stem (7) is fitted with an upper valve disc (18) that is compatible with the upper sealing seat (17). A pressure block (19) is fixedly connected to the valve stem (7). The bottom of the valve stem (7) is provided with an internal threaded hole (22). A screw (9) is internally threaded into the internal threaded hole (22). The lower end of the screw (9) passes through the valve port (26). The bottom of the valve body (1) is provided with an installation port (4). A sealing cover (5) is sealed to the corresponding installation port (4). A lower valve disc (12) that is compatible with the lower sealing seat (16) is slidably connected in the vertical direction inside the installation port (4). An axial limiting component and a radial positioning component are connected between the lower valve disc (12) and the screw (9).

2. The double-seat sandwich sealing gate valve according to claim 1, characterized in that: The bottom of the valve cover (6) is fixedly connected to a sealing valve seat (20), and the valve stem (7) is provided with a sealing valve disc (21) that corresponds to and matches the sealing valve seat (20).

3. The double-seat sandwich sealing gate valve according to claim 1, characterized in that: The mounting port (4) is provided with a flange (23), and a sealing gasket (25) is connected between the flange (23) and the sealing cover (5). The flange (23) and the sealing cover (5) are fixedly connected by multiple bolts (24).

4. The double-seat sandwich sealing gate valve according to claim 1, characterized in that: The inner wall of the mounting port (4) is provided with multiple sliding grooves (10), and the lower valve disc (12) is provided with multiple sliders (11) that correspond one-to-one with the sliding grooves (10).

5. The double-seat sandwich-sealed shut-off valve according to any one of claims 1 to 4, characterized in that: The radial positioning assembly includes a positioning groove (15) set on the top of the lower valve disc (12). The longitudinal section of the positioning groove (15) is an inverted T-shape. The lower end of the screw (9) is adapted to the positioning groove (15).

6. The double-seat sandwich-sealed shut-off valve according to claim 5, characterized in that: The radial positioning assembly includes a positioning pin (14) fixedly connected to the lower valve disc (12) and a positioning hole (13) provided on the screw (9). The positioning pin (14) passes through the positioning hole (13) and is slidably adapted to the positioning hole (13).

Images