Self-sealing stop valve

Abstract

The application provides a self-sealing stop valve, and relates to the technical field of valves, which comprises a valve body, an end cover, a valve rod and a threaded block, the threaded block is engaged on the threaded section of the valve rod, a fixed rod is fixedly installed on the end cover, a through hole matched with the fixed rod is formed in the threaded block, an inclined limiting groove is formed in the fixed rod, a ball is arranged in the limiting groove, two parallel sliding grooves are formed in the fixed rod, and the limiting groove is not parallel to the sliding grooves, a limiting block is arranged, two sliding blocks are arranged on the inner profile surface of the limiting block, the sliding blocks are matched with the sliding grooves, and the profile surface can be in contact with the ball, the sliding of the limiting block is limited by the ball, so that installation is facilitated, when disassembling, the stop valve is inclined, the ball is not in contact with the limiting block, and disassembling is facilitated.

Description

Technical Field

[0001] This invention relates to the field of valve technology, specifically a self-sealing shut-off valve. Background Technology

[0002] A sealed gate valve is a valve in which the closing element (valve disc) moves along the centerline of the valve seat. Based on this movement of the valve disc, the change in the valve seat opening is directly proportional to the valve disc stroke. Because this type of valve has a relatively short opening or closing stroke and provides a very reliable shut-off function.

[0003] However, currently, when assembling gate valves, bolts are usually used to fix the threaded blocks connected to the valve stem, thereby limiting the position of the valve stem. However, using bolts is inconvenient for installation and disassembly, and since the environment in which sealed gate valves are used is mostly humid, it is inconvenient to remove the bolts when they rust. Summary of the Invention

[0004] The purpose of this invention is to provide a self-sealing shut-off valve, which aims to solve the problem that the bolts on the existing sealing shut-off valves are inconvenient to disassemble when they rust.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: The self-sealing shut-off valve includes: a valve body, an end cap, a valve stem, and a threaded block, wherein the threaded section of the valve stem is engaged with the threaded block; a fixed rod is fixedly installed on the end cap, the threaded block has a through hole adapted to the fixed rod, the fixed rod has an inclined limiting groove, a ball is disposed in the limiting groove, and the fixed rod has two parallel sliding grooves, wherein the limiting groove is not parallel to the sliding groove; a limiting block has two sliders disposed on its inner surface, the sliders are adapted to the sliding groove, and the surface can contact the ball.

[0006] A further technical solution of the present invention is that the number of limiting grooves is two, and they are arranged symmetrically.

[0007] A further technical solution of the present invention is that the included angle between the two limiting grooves along their length is 10°-25°.

[0008] A further technical solution of the present invention is that the slide is an inclined groove, and the inclined direction is opposite to the inclined direction of the limiting groove.

[0009] A further technical solution of the present invention is that a retaining edge is provided at one end of the limiting groove.

[0010] A further technical solution of the present invention is that the number of the fixing rod and the limiting block are both two.

[0011] A further technical solution of the present invention is that a connecting rod is fixedly connected between the two limiting blocks.

[0012] A further technical solution of the present invention is that a limiting edge is provided at the arc-shaped edge of the bottom surface of the limiting groove.

[0013] The beneficial effects of this invention are:

[0014] When in use, the ball bearings restrict the sliding of the limiting block, thus facilitating installation. When disassembling, the tilting shut-off valve prevents the ball bearings from contacting the limiting block, thus facilitating disassembly. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0016] Figure 2 This is a schematic diagram of the structure of the fixing rod in Embodiment 1 of the present invention.

[0017] Figure 3 This is a schematic diagram of another fixed rod in Embodiment 1 of the present invention.

[0018] Figure 4 This is a front view of the fixing rod in Embodiment 1 of the present invention.

[0019] Figure 5 This is a top view of the fixing rod in Embodiment 1 of the present invention.

[0020] Figure 6 This is a schematic diagram of the limiting block in Embodiment 1 of the present invention.

[0021] Figure 7 This is a structural schematic diagram of Embodiment 3 of the present invention.

[0022] In the diagram: 11. Valve body; 12. End cap; 121. Fixing rod; 121a. Inclined groove; 121b. Limiting groove; 121c. Limiting edge; 121d. Stop edge; 122. Limiting ring; 13. Valve stem; 131. Threaded block; 2. Limiting block; 2a. Inner U-shaped surface; 21. Slider; 22. Connecting rod; 3. Ball bearing. Detailed Implementation

[0023] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0024] Example 1:

[0025] like Figure 1 and 2 As shown, a self-sealing shut-off valve includes a valve body 11 and an end cap 12. A valve stem 13 is slidably mounted on the end cap 12. A threaded block 131 engages with the threaded section of the valve stem 13. Two fixing rods 121 are fixedly mounted on the end cap 12. Two through holes adapted to the fixing rods 121 are opened on the threaded block 131. A limit ring 122 is fixedly mounted on the fixing rod 121. The limit ring 122 is used to support the threaded block 131.

[0026] like Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, two inclined grooves 121a are symmetrically opened on the side of the fixed rod 121 near the top. The two inclined grooves 121a are parallel. A limiting groove 121b with the opposite inclination to the inclined groove 121a is opened below the inclined groove 121a. The included angle between the two limiting grooves 121b is 10°-25°. A retaining edge 121d is provided at one end of the limiting groove 121b.

[0027] like Figure 6 As shown, a limiting block 2 is installed at the top of the fixed rod 121. The limiting block 2 is approximately U-shaped. Two sliders 21 are symmetrically arranged on the inner U-shaped surface 2a of the limiting block 2. The sliders 21 are adapted to the inclined groove 121a. A ball bearing 3 is arranged in the limiting groove 121b. A retaining edge is provided at one end of the limiting groove 121b to prevent the ball bearing 3 from rolling out from the higher end of the limiting groove 121b. The inner U-shaped surface 2a can contact the ball bearing 3. Under the action of gravity, the ball bearing 3 rolls inward U-shaped. The inner bottom of the U-shaped surface 2a has a tendency to move, which causes the ball 3 to be stuck between the side wall of the U-shaped surface 2a and the limiting groove 121b, thereby preventing the limiting block 2 from falling off the fixing rod 121. Since the limiting block 2 is installed on the fixing rod 121 by tilting the slider 21 into the limiting groove 121b, the closed end of the limiting block 2 is attached to the fixing rod 121 under the action of gravity, thereby further preventing the limiting block 2 from falling off the fixing rod 121.

[0028] During installation, the ball bearing 3 is placed in the limiting groove 121b, and then the slider 21 on the limiting block 2 is fully inserted along the inclined groove 121a. At this time, the bottom surface of the limiting block 2 contacts the top surface of the threaded block 131. The ball bearing 3 is pushed to the other end of the limiting groove 121b. Due to the force of gravity, the ball bearing 3 tends to move towards the other end of the inclined groove 121a. Since the ball bearing 3 is located between the inner U-shaped surface 2a and the side of the limiting groove 121b, and the distance between the side of the limiting groove 121b and the inner U-shaped surface 2a gradually decreases from the highest end to the lowest end of the limiting groove 121b, the ball bearing 3 is stuck between the inner U-shaped surface 2a and the limiting groove 121b. This increases the friction between the inner U-shaped surface 2a and the ball bearing 3, thereby preventing the limiting block 2 from sliding out in the opposite direction.

[0029] Example 2:

[0030] like Figure 2 and 3 As shown, an improvement is made based on Embodiment 1. A limiting edge 121c is provided at the arc-shaped edge of the bottom surface of the limiting groove 121b. When the shut-off valve is installed, and the valve stem 13 of the shut-off valve is placed vertically, the limiting edge 121c prevents the ball 3 from falling out of the limiting groove 121b.

[0031] Example 3:

[0032] like Figure 7 As shown, an improvement is made based on Embodiment 2, in which the two limiting blocks 2 are connected by a connecting rod 22, which makes it convenient to install the two limiting blocks 2 onto the two fixing rods 121 at the same time.

Claims

1. A self-sealing shut-off valve, characterized in that, include: Valve body (11), end cap (12), valve stem (13) and threaded block (131), with threaded block (131) meshing on the threaded section of valve stem (13). A fixing rod (121) is fixedly installed on the end cap (12). A through hole adapted to the fixing rod (121) is provided on the threaded block (131). An inclined limiting groove (121b) is provided on the fixing rod (121). A ball (3) is provided in the limiting groove (121b). Two parallel sliding grooves are provided on the fixing rod (121). The limiting groove (121b) is not parallel to the sliding groove. The sliding groove is an inclined groove (121a), and the inclination direction is opposite to the inclination direction of the limiting groove (121b). A retaining edge (121d) is provided at one end of the limiting groove (121b). A limiting edge (121c) is provided at the arc-shaped edge of the bottom surface of the limiting groove (121b). The limiting block (2) has two sliders (21) on its inner U-shaped surface (2a). The sliders (21) are adapted to the groove, and the U-shaped surface (2a) can contact the ball (3). During installation, the ball (3) is placed in the limiting groove (121b), and then the slider (21) on the limiting block (2) is fully inserted along the inclined groove (121a). At this time, the bottom surface of the limiting block (2) is in contact with the top surface of the threaded block (131). At this time, the ball (3) is pushed to the other end of the limiting groove (121b). Due to the gravity, the ball (3) tends to move towards the other end of the inclined groove (121a). Since the ball (3) is located between the inner U-shaped surface (2a) and the side of the limiting groove (121b), and the distance between the side of the limiting groove (121b) and the inner U-shaped surface 2a gradually decreases from the highest end to the lowest end of the limiting groove (121b), the ball (3) is stuck between the inner U-shaped surface (2a) and the limiting groove (121b).

2. The self-sealing shut-off valve according to claim 1, characterized in that, The number of the limiting grooves (121b) is two, and they are arranged symmetrically.

3. The self-sealing shut-off valve according to claim 2, characterized in that, The included angle between the two limiting grooves (121b) along their length is 10°-25°.

4. The self-sealing shut-off valve according to claim 1, characterized in that, The number of fixed rods (121) and limiting blocks (2) are both two.

5. The self-sealing shut-off valve according to claim 4, characterized in that, A connecting rod (22) is fixedly connected between the two limiting blocks (2).

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