Pneumatic gate valve with blowing function

Abstract

The utility model discloses a pneumatic gate valve with a purging function, which relates to the technical field of valves and comprises a valve body, a valve rod, a valve seat, a gate plate and a pneumatic actuator, the valve body is provided with a medium channel, the gate plate is movably arranged in the valve body along the direction perpendicular to the medium channel, the valve seat is arranged in the medium channel and can be in sealing fit with the gate plate, and the pneumatic actuator is arranged in the valve body. One end of the valve rod is connected with the flashboard, the other end of the valve rod extends out of the valve body to be connected with a pneumatic actuator, a purging valve is arranged on the outer side of the medium channel, an annular purging piece is arranged on the inner side of the medium channel and communicated with the purging valve, and a plurality of purging holes are formed in the side, close to the flashboard, of the purging piece. The valve can effectively purge and wash the flashboard, prevents viscous residues, guarantees the sealing reliability of the valve, and prolongs the service life of the valve.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, and particularly relates to a pneumatic gate valve with a purging function. Background Art

[0002] A gate valve generally uses a wedge gate or a parallel gate as a closing and opening member, which relies on fluid pressure and wedging force to seal the medium flow passage of the valve. At present, wedge gate valves have been widely used in water supply and drainage, heating, power, environmental protection and other conveying lines. After use, the surface of the gate plate of the existing gate valve is prone to sticky residues of the conveyed medium, and some media are prone to crystallization. The crystallization will have strong corrosive damage to the gate plate, and the accumulation of crystallization at the seal will also cause the sealing performance of the valve to decline, affecting the service life of the valve. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the utility model provides a pneumatic gate valve with a purging function.

[0004] The technical solution provided by the utility model is as follows:

[0005] A pneumatic gate valve with a purging function, including a valve body, a valve stem, a valve seat, a gate plate, and a pneumatic actuator. The valve body is provided with a medium channel. The gate plate is arranged in the valve body so as to be movable in a direction perpendicular to the medium channel. The valve seat is arranged in the medium flow channel and can form a sealing fit with the gate plate. One end of the valve stem is connected to the gate plate, and the other end extends out of the valve body and is connected to the pneumatic actuator. A purging valve is arranged outside the medium channel, and an annular purging member is arranged inside the medium channel. The purging member is communicated with the purging valve, and a plurality of purging holes are arranged on the side of the purging member close to the gate plate.

[0006] The purging member is of a split-ring structure, including an upper half and a lower half. The end of the purging member is provided with a convex mounting portion, and the medium channel is provided with a mounting groove corresponding to the convex mounting portion.

[0007] The purging member is provided with a purging channel for the medium to pass through. The purging holes communicate the purging channel and the medium channel, and the purging holes gradually narrow from the purging channel to the surface of the purging member.

[0008] The purging holes are inclined towards the sealing surface of the valve seat.

[0009] A connecting member is arranged between the purging member and the purging valve. The connecting member is hollow. One end of the connecting member extends into the valve body and is communicated with the purging member, and the other end extends out of the valve body. The end is provided with a connecting flange for connecting with the purging valve.

[0010] A valve cover is arranged on the valve body, and the valve cover is detachably connected to the valve body by bolts.

[0011] A bracket is arranged between the valve cover and the pneumatic actuator.

[0012] A packing assembly is provided between the valve cover and the valve stem. The packing assembly includes packing, a packing pressing plate, and a packing gland. The packing gland is connected to the valve cover through a union bolt to compress the packing pressing plate, and further compress the packing.

[0013] Advantages of the present utility model: By providing a purging valve outside the medium passage and an annular purging member inside the medium passage, and connecting the purging member to the purging valve, the purging valve can introduce high-temperature steam medium, and the purging member is used to change the purging direction, so that the high-temperature steam medium can effectively purge and wash the gate plate, prevent sticking and residue, ensure the reliability of the valve seal, and extend the service life of the valve. Description of the Drawings

[0014] Figure 1 is a schematic structural diagram of an embodiment of the present utility model;

[0015] Figure 2 is a schematic cross-sectional structural diagram of the A-A' plane of an embodiment of the present utility model;

[0016] Figure 3 is Figure 1 a partial enlarged view of... Detailed Embodiments

[0017] The embodiments of the present utility model will be further described below with reference to the drawings.

[0018] As Figures 1-3 shown, a pneumatic gate valve with a purging function includes a valve body 1, a valve stem 5, a valve seat 3, a gate plate 4, and a pneumatic actuator 11. The valve body 1 is provided with a medium passage. The gate plate 4 is arranged in the valve body 1 so as to move in a direction perpendicular to the medium passage. The valve seat 3 is arranged in the medium flow passage and can form a sealing fit with the gate plate 4. One end of the valve stem 5 is connected to the gate plate 4, and the other end extends out of the valve body and is connected to the pneumatic actuator 11. A purging valve 7 is provided outside the medium passage, and an annular purging member 2 is provided inside the medium passage. A connecting member 12 is provided between the purging member 2 and the purging valve 7. The connecting member 12 is hollow. One end of it extends into the valve body and is connected to the purging member 2, and the other end extends out of the valve body. The end is provided with a connecting flange 14 for connecting to the purging valve 7. A plurality of purging holes 18 are provided on the purging member 2 close to the gate plate side. When the valve needs to be purged, the purging valve 7 can introduce high-temperature steam medium. The high-temperature steam medium is conveyed to the purging member 2 through the transmission passage 13 in the middle of the connecting member 12. After the purging direction is changed by the purging member 2, the high-temperature steam medium can effectively purge and wash the gate plate 4, prevent sticking and residue, ensure the reliability of the valve seal, and extend the service life of the valve.

[0019] In this embodiment, the purging member 2 has a split-ring structure, including an upper half 21 and a lower half 22. The end of the purging member is provided with a convex mounting portion 19. The medium passage is provided with a mounting groove 23 corresponding to the convex mounting portion 19. During installation, the convex mounting portions 19 of the upper half 21 and the lower half 22 are respectively installed into the mounting groove 23, and fixed to the valve body 1 by screws 15, and the upper half 21 and the lower half 22 are closed to form an annular structure. The purging member 2 is provided with a purging passage 17 for the medium to pass through. The purging holes 18 communicate the purging passage 17 and the medium passage. The purging holes 18 gradually narrow from the purging passage to the surface of the purging member, so that the jet force of the medium purging and flushing the gate is stronger, and the purging and flushing efficiency is improved. Further, the purging holes 18 are inclined towards the sealing surface of the valve seat, so that the medium purging and flushing the gate first sprays towards the sealing surface, preventing sticking and remaining on the sealing surface and affecting the sealing performance of the valve.

[0020] In this embodiment, a valve cover 6 is provided on the valve body 1. The valve cover 6 is detachably connected to the valve body 1 by bolts, which is convenient for disassembly and assembly. A sealing gasket is provided between the valve body 1 and the valve cover 6 to ensure the sealing performance of the connection. A bracket 10 is provided between the valve cover 6 and the pneumatic actuator 11. The bracket 10 supports the pneumatic actuator 11 to ensure its stability during operation. A packing assembly is provided between the valve cover 6 and the valve stem 5, including a packing 7, a packing pressing plate 8, and a packing gland 9. The packing gland 9 is connected to the valve cover 6 by a union bolt to press the packing pressing plate 8, and then press the packing 7 to ensure that the medium does not leak from the mating part of the valve stem 5 and the valve cover 6, and ensure the reliability of the valve seal.

[0021] The embodiments should not be construed as limiting the present invention. Any non-creative improvement based on the spirit of the present invention should be regarded as within the protection scope of the present invention.

Claims

1. A pneumatic gate valve with a purge function, comprising a valve body, a valve stem, a valve seat, a gate plate, and a pneumatic actuator, wherein the valve body is provided with a medium passage, the gate plate can be movably arranged in the valve body in a direction perpendicular to the medium passage, the valve seat is arranged in the medium flow channel and can form a sealing match with the gate plate, one end of the valve stem is connected to the gate plate, and the other end extends out of the valve body and is connected to the pneumatic actuator, characterized in that: A purge valve is arranged outside the medium channel, and an annular purge member is arranged inside the medium channel. The purge member is communicated with the purge valve, and a plurality of purge holes are arranged on the purge member near the gate plate.

2. The pneumatic gate valve with a purge function according to claim 1, characterized in that: The purge member is a split ring structure, including an upper half and a lower half. A protruding mounting portion is provided at the end of the purge member, and a mounting groove is provided in the medium channel corresponding to the protruding mounting portion.

3. The pneumatic gate valve with a purge function according to claim 1, characterized in that: The purge member is provided with a purge channel for medium to pass through, the purge hole connects the purge channel and the medium channel, and the purge hole gradually narrows from the purge channel to the surface of the purge member.

4. The pneumatic gate valve with a purge function according to claim 3, characterized in that: The purge hole is inclined toward the sealing surface of the valve seat.

5. The pneumatic gate valve with a purge function according to claim 1, characterized in that: A connecting piece is provided between the purge piece and the purge valve. The connecting piece is hollow, one end of which extends into the valve body and communicates with the purge piece, and the other end extends out of the valve body. A connecting flange for connecting to the purge valve is provided at the end.

6. The pneumatic gate valve with a purge function according to claim 1, characterized in that: The valve body is provided with a valve cover, and the valve cover is detachably connected to the valve body via bolts.

7. The pneumatic gate valve with a purge function according to claim 6, characterized in that: A bracket is arranged between the valve cover and the pneumatic actuator.

8. The pneumatic gate valve with a purge function according to claim 6, characterized in that: A packing assembly is provided between the valve cover and the valve stem, and the packing assembly includes packing, a packing pressure plate, and a packing pressure cover. The packing pressure cover is connected to the valve cover via a movable bolt to compress the packing pressure plate, and further compress the packing.

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