Pneumatic straight-through stop valve

Abstract

The utility model provides a pneumatic straight-through stop valve, and belongs to the technical field of stop valves. The problem that in the prior art, the flow direction of media is not flexible enough is solved. The pneumatic check valve comprises a valve body, a valve element, a valve rod and a pneumatic actuator, a sealing end cover is fixedly installed at the upper end of the valve body, the valve element is installed at the lower end of the valve rod, the valve element is sleeved with a valve cage in a connected mode, the whole valve cage is in a hollow cylinder shape, and a plurality of throttling windows and guide grooves are formed in the surface of the valve cage and distributed at intervals. A connecting hole is formed in the lower end of the sealing end cover, the connecting convex body extends into the connecting hole, a guide frame is installed at the upper end of the sealing end cover, the guide frame is fixed to the lower end of the pneumatic actuator, and a connecting shaft extends out of the pneumatic actuator. The coupling shaft is connected with the upper end of the valve rod. The utility model has the advantages of flexible fluid flow and good sealing performance.

Description

Technical Field

[0001] This utility model belongs to the field of gate valve technology and relates to a pneumatic straight-through gate valve. Background Technology

[0002] Pneumatic straight-through shut-off valves are pneumatically driven and have a straight-through flow channel as their core. They also have the advantages of reliable sealing, convenient operation, and good maintainability, and are widely used in the shut-off control of clean fluids.

[0003] Chinese patent publication number CN203880101U discloses an adjustable and shut-off straight-through pneumatic shut-off valve, including a valve body, a valve port, a cone, a valve disc, an actuator, a piston rod, an air outlet, and an air inlet. The valve body is provided with an air inlet, an air outlet, and a valve port. The valve port is located between the air inlet and the air outlet and has a frustum-shaped structure. The actuator is fixedly connected to the valve body. The piston rod fixed to the actuator is connected to a connecting screw through a thread. The other end of the connecting screw is connected to the valve disc. A cone is fixed at the lower part of the valve disc and matches the valve port. The actuator is a three-position pneumatic actuator.

[0004] In the adjustable and shut-off straight-through pneumatic shut-off valve provided by this patent, the sealing between the valve port and the cone body relies on the medium pressure of low inlet and high outlet to assist the sealing. However, the sealing force is insufficient when the flow is reversed, which can easily lead to leakage and limit the flexibility of the medium flow direction. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by providing a pneumatic straight-through shut-off valve.

[0006] The objective of this utility model can be achieved through the following technical solution: A pneumatic straight-through shut-off valve includes a valve body, a valve core, a valve stem, and a pneumatic actuator. The upper end of the valve body has a connecting flange and a fixed sealing end cap. The valve stem passes through the sealing end cap and extends into the valve body. The valve core is installed at the lower end of the valve stem. A valve cage is fitted around the valve core. The valve cage is a hollow cylindrical shape. Several throttling windows and guide grooves are distributed along the outer periphery of the valve cage on its surface. The throttling windows and guide grooves are spaced apart. A valve seat is fixedly installed at the lower end of the valve cage. A limiting protrusion is formed at the upper end of the valve cage. A connecting protrusion is formed in the valve cage above the limiting protrusion. A connecting hole is formed at the lower end of the sealing end cap. The connecting protrusion extends into the connecting hole. The upper end of the sealing end cap is convex and a guide frame is installed on the upper end of the sealing end cap. The guide frame is fixed to the lower end of the pneumatic actuator. A connecting shaft extends from the pneumatic actuator and is connected to the upper end of the valve stem.

[0007] In the aforementioned pneumatic straight-through shut-off valve, the throttling window has a water droplet streamline structure.

[0008] In the above-mentioned pneumatic straight-through shut-off valve, the upper end of the sealing end cover has a convex shape with a sealing groove inside, and a sealing packing is installed in the sealing groove. A packing pressure block is fixedly fitted on the valve stem at the upper end of the sealing groove, and the packing pressure block is fitted and installed in close contact with the sealing packing. A sealing pressure ring is fixedly fitted on the convex shape of the upper end of the sealing end cover.

[0009] In the aforementioned pneumatic straight-through shut-off valve, a sealing ring is installed at the upper end of the limiting protrusion, and the sealing ring is located between the upper end of the limiting protrusion and the lower end of the sealing end cap.

[0010] Compared with the prior art, the pneumatic straight-through shut-off valve provided by this utility model has the following beneficial effects: 1. The throttling window adopts a water droplet streamline structure, which reduces the retention and blockage of particles in the medium and is suitable for bidirectional flow of fluids containing impurities; 2. Through precise drive by a pneumatic actuator, the valve core and the valve seat plane are tightly fitted to achieve absolute sealing when shutting off. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the exploded structure of this utility model;

[0012] Figure 2 This is a schematic cross-sectional view of the present invention;

[0013] Figure 3 This is a schematic diagram of the valve cage structure.

[0014] In the diagram: 1. Valve body; 110. Connecting flange; 2. Valve core; 3. Valve stem; 4. Pneumatic actuator; 41. Connecting shaft; 5. Sealing end cap; 51. Connecting hole; 52. Sealing groove; 6. Valve cage; 61. Throttling window; 62. Guide groove; 63. Limiting protrusion; 64. Connecting protrusion; 7. Valve seat; 8. Guide frame; 9. Sealing packing; 10. Packing block; 11. Sealing pressure ring; 12. Sealing ring. Detailed Implementation

[0015] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0016] like Figures 1 to 3As shown, this embodiment includes a valve body 1, a valve core 2, a valve stem 3, and a pneumatic actuator 4. A connecting flange 110 is formed at the upper end of the valve body 1, and a sealing end cap 5 is fixedly installed thereon. The valve stem 3 passes through the sealing end cap 5 and extends into the interior of the valve body 1. The valve core 2 is installed at the lower end of the valve stem 3. A valve cage 6 is fitted and connected to the outside of the valve core 2. The valve cage 6 is a hollow cylindrical shape. Several throttling windows 61 and guide grooves 62 are distributed along the outer periphery of the valve cage 6 on the surface of the valve cage 6. The throttling windows 61 and guide grooves 62 are spaced apart. A valve seat 7 is fixedly installed at the lower end of the valve cage 6. The valve core 2 and the valve seat 7 are tightly fitted together. A limiting protrusion 63 is formed at the upper end of the valve cage 6. A connecting protrusion 64 is formed in the valve cage 6 above the limiting protrusion 63. A connecting hole 51 is formed at the lower end of the sealing end cap 5. The connecting protrusion 64 extends into the connecting hole 51, so that the valve cage 6 is connected to the sealing end cap 5.

[0017] To elaborate further, such as Figure 3 As shown, the throttling window 61 has a water droplet streamline structure. When the valve core 2 rises and falls, the overlapping area of ​​the throttling window 61 changes, controlling the flow cross section. The opening shape of the throttling window 61 with its water droplet streamline structure is not easy to clog impurities.

[0018] like Figures 1 to 2 As shown, the upper end of the sealing end cover 5 is convex and a guide frame 8 is installed on the upper end of the sealing end cover 5. The guide frame 8 is fixed to the lower end of the pneumatic actuator 4. The pneumatic actuator 4 extends out with a connecting shaft 41, which is connected to the upper end of the valve stem 3. The upper end of the sealing end cover 5 is convex and has a sealing groove 52 inside. A sealing packing 9 is installed in the sealing groove 52. A packing block 10 is fixedly fitted on the outside of the valve stem 3 at the upper end of the sealing groove 52. The packing block 10 is fitted and installed in close contact with the sealing packing 9. A sealing ring 11 is fixedly fitted on the outer side of the upper end of the sealing end cover 5.

[0019] To elaborate further, such as Figure 2 As shown, the sealing ring 12 is installed between the upper end of the limiting protrusion 63 and the lower end of the sealing end cover 5 to ensure the sealing between the valve cage 6 and the sealing end cover 5.

[0020] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0021] Although this document uses a variety of terms, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this invention; interpreting them as any additional limitation would contradict the spirit of this invention.

Claims

1. A pneumatic straight-through shut-off valve, comprising a valve body (1), a valve core (2), a valve stem (3), and a pneumatic actuator (4), wherein a connecting flange (110) is formed at the upper end of the valve body (1) and a sealing end cap (5) is fixedly installed thereon, the valve stem (3) passes through the sealing end cap (5) and extends into the valve body (1), and the valve core (2) is installed at the lower end of the valve stem (3), characterized in that: A valve cage (6) is sleeved and connected to the outside of the valve core (2). The valve cage (6) is a hollow cylindrical shape. Several throttling windows (61) and guide grooves (62) are distributed along the outer periphery of the valve cage (6) on its surface. The throttling windows (61) and guide grooves (62) are spaced apart. A valve seat (7) is fixedly installed at the lower end of the valve cage (6). A limiting protrusion (63) is formed at the upper end of the valve cage (6). The valve cage (6) at the upper end of the limiting protrusion (63) is... A connecting protrusion (64) is formed in the middle. A connecting hole (51) is opened at the lower end of the sealing end cover (5). The connecting protrusion (64) extends into the connecting hole (51). The upper end of the sealing end cover (5) is convex and a guide frame (8) is installed on the upper end of the sealing end cover (5). The guide frame (8) is fixed to the lower end of the pneumatic actuator (4). A connecting shaft (41) extends out of the pneumatic actuator (4). The connecting shaft (41) is connected to the upper end of the valve stem (3).

2. The pneumatic straight-through shut-off valve according to claim 1, characterized in that: The throttling window (61) has a water droplet streamline structure.

3. A pneumatic straight-through shut-off valve according to claim 1, characterized in that: The upper end of the sealing end cap (5) has a convex shape with a sealing groove (52) inside. A sealing packing (9) is installed in the sealing groove (52). A packing block (10) is sleeved and fixed on the valve stem (3) at the upper end of the sealing groove (52). The packing block (10) is fitted and installed in close contact with the sealing packing (9). A sealing ring (11) is sleeved and fixed on the convex shape outside the upper end of the sealing end cap (5).

4. A pneumatic straight-through shut-off valve according to claim 1, characterized in that: A sealing ring (12) is installed on the upper end of the limiting protrusion (63), and the sealing ring (12) is located between the upper end of the limiting protrusion (63) and the lower end of the sealing end cap (5).

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