Spring type double-gate valve

Abstract

The utility model discloses a spring type double-gate valve which comprises a valve body, a valve cover is fixed on the upper portion of the valve body, and a valve rod penetrates through the valve cover from top to bottom. The lower end of the valve rod is fixedly connected with the two gate plates in the valve body through a gate plate connecting piece and a plate connecting device; the upper ends of the two gate plates are connected in a clamped mode through a plate connecting device, and a spring is arranged between the two gate plates. And the outer side sealing surfaces of the two gate plates are respectively clung to the sealing surface of the valve seat in the valve body. The utility model solves the problems that the valve cannot be opened due to the fact that the gate and the valve seat sealing surface of the single-gate wedge-type structure valve in the existing high-temperature and high-pressure pipeline are easily squeezed, and the sealing performance of the single-gate flat plate structure valve is poor.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves and relates to a spring type double gate valve. Background Art

[0002] At present, there are two types of valves used to cut off high-temperature and high-pressure pipelines. The specific structures are as follows:

[0003] One is a valve with a single gate wedge structure. The characteristic of this valve is that the gate is squeezed against the valve seat sealing surface by an inclined block. The more it is pressed, the tighter it becomes, and the sealing performance is better. The disadvantage is that due to the effect of thermal expansion and contraction due to high temperature, the gate and the valve seat sealing surface are easily squeezed together, making the valve unable to open.

[0004] The other is a single-gate flat-plate structure valve. The characteristic of this valve is that the gate is pressed against the sealing surface of the valve seat on one side by wind pressure. Since there is a gap between the gate and the sealing surface of the valve seat on the other side, the gate can also run smoothly under high temperature and high pressure. The disadvantage is that the sealing performance is relatively poor due to the lack of active sealing force. Summary of the invention

[0005] In order to achieve the above-mentioned purpose, the utility model provides a spring-loaded double-disc gate valve, which solves the problem that the gate and valve seat sealing surfaces of the single-disc wedge-shaped structure valve in the existing high-temperature and high-pressure pipeline are easily squeezed to make the valve unable to open, and the single-disc flat-plate structure valve has poor sealing performance.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is a spring-type double-gate valve, including a valve body, a valve cover fixed on the upper part of the valve body, and a valve stem passing through the valve cover from top to bottom; the lower end of the valve stem is fixedly connected to two gates located inside the valve body by a gate connector and a plate connector; the upper ends of the two gates are clamped by a plate connector, and a spring is arranged between the two gates; the outer sealing surfaces of the two gates are respectively tightly attached to the sealing surfaces of the valve seats inside the valve body.

[0007] Furthermore, the gate plate connecting piece is fixed to the lower end of the valve stem, and the lower end of the gate plate connecting piece is fixedly connected to the upper end of the plate connector; the gate plate connecting piece is fixed to the valve stem through a pin shaft; and both ends of the spring are respectively fixedly connected to the side of the two gate plates away from the valve body.

[0008] Furthermore, the lower part of the valve cover is fixed to the inside of the valve body by a positioning ring, a second positioning seat, and a sealing ring, wherein the sealing ring is sleeved on the outside of the valve cover, the second positioning seat is arranged above the sealing ring, the positioning ring is located above the second positioning seat, and the positioning ring is fixed in a concave groove on the inside of the valve body.

[0009] Furthermore, a pressure plate is arranged above the valve cover, and the pressure plate sliding sleeve is arranged on the outside of the valve stem; the pressure plate is fixedly connected to a first positioning seat fixed on the outside of the upper end of the valve cover by bolts; a sealing packing is arranged between the valve cover and the valve stem, and a pressure cover is arranged above the sealing packing, and the pressure cover is fixed to the lower surface of the pressure plate.

[0010] The beneficial effects of the utility model are:

[0011] The utility model thoroughly solves the shortcomings of the two valves described in the background technology. Since a spring is arranged between the double gate plates, when the valve expands and contracts due to high temperature, the spring offsets the deformation of the gate plates, thereby solving the problem of the gate plates and the valve seat sealing surfaces being squeezed. At the same time, due to the design of the spring, the double gate plates are always tightly attached to their respective valve seat sealing surfaces, thereby ensuring the sealing of the valve.

[0012] The utility model is used in high-temperature and high-pressure pipelines and is an ideal safety protection device, which can ensure that it plays a good role in isolating the medium when an accident occurs in the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a structural schematic diagram of a spring type double gate valve according to an embodiment of the utility model.

[0015] Figure 2 yes Figure 1 AA section view.

[0016] In the figure, 1. valve body, 2. gate, 3. spring, 4. plate connector, 5. gate connector, 6. pin shaft, 7. valve stem, 8. first positioning seat, 9. pressure plate, 10. pressure cover, 11. sealing packing, 12. positioning ring, 13. second positioning seat, 14. sealing ring, 15. valve cover. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] like Figure 1~Figure 2 As shown, the embodiment of the utility model provides a spring-type double gate valve, including a valve body 1, a valve cover 15 fixed to the upper part of the valve body 1, a valve stem 7 passing through the valve cover 15 from top to bottom, and the lower end of the valve stem 7 is fixedly connected to two gates 2 inside the valve body 1 by a gate connector 5, a pin 6, and a plate connector 4; the upper ends of the two gates 2 are clamped by the plate connector 4 to prevent the two gates 2 from falling apart; the sealing surface of the gate 2 is in close contact with the sealing surface of the valve seat inside the valve body 1.

[0019] In some embodiments, the gate connector 5 is sleeved on the lower end of the valve stem 7 and fixed to the valve stem 7 through the pin 6; the lower end of the gate connector 5 is fixedly connected to the upper end of the plate connector 4. The valve stem 7 drives the gate 2 to move up and down through the gate connector 5, the pin 6, and the plate connector 4. A spring 3 is arranged between the two gates 2, wherein the two ends of the spring 3 are respectively fixedly connected to the side of the two gates 2 away from the valve body 1. When the gate 2 moves, under the elastic force of the spring 3, the gate 2 and the valve seat sealing surface of the valve body 1 are always in close contact to maintain the seal. When the gate 2 is lowered into place, the gate 2 is completely fitted with the valve seat sealing surface of the valve body 1 under the action of the spring 3, playing an auxiliary sealing role.

[0020] In some embodiments, when the valve stem 7 moves, in order to prevent the valve cover 15 from moving with the valve stem 7, the lower part of the valve cover 15 is fixed to the inside of the valve body 1 through the positioning ring 12, the second positioning seat 13, and the sealing ring 14, wherein the sealing ring 14 is sleeved on the outside of the valve cover 15, the second positioning seat 13 is arranged above the sealing ring 14, and the positioning ring 12 is fixed in the concave groove on the inside of the valve body 1, located above the second positioning seat 13, and is used to limit the second positioning seat 13. During installation, the valve cover 15 is first installed, and then the sealing ring 14 and the second positioning seat 13 are installed, and finally the positioning ring 12 is installed. The positioning ring 12 is milled into 4 petals, and the concave groove of the positioning ring 12 is provided on the valve body 1, and 1 / 4 of the part is milled to the uppermost position of the valve body 1 (that is, one quarter of the concave groove extends upward to the top of the valve body 1), and the 4-petal positioning rings 12 are put into the groove one by one from this position, and rotated to the correct position to prevent them from falling out of the groove.

[0021] In some embodiments, a pressure plate 9 is arranged above the valve cover 15, and the pressure plate 9 is slidably sleeved on the outside of the valve stem 7; the pressure plate 9 is fixedly connected to the first positioning seat 8 fixed to the outside of the upper end of the valve cover 15 by bolts; a sealing packing 11 is arranged between the valve cover 15 and the valve stem 7, and a pressure cap 10 is arranged above the sealing packing 11, and the pressure cap 10 is fixed to the lower surface of the pressure plate 9. The pressure plate 9 compacts the sealing packing 11 through the pressure cap 10 to achieve the upper sealing of the valve stem 7.

[0022] The working process of the utility model is:

[0023] When the medium in the pipeline needs to be cut off, the power device pushes the valve stem 7 to move downward, and the valve stem 7 pushes the two gate plates 2 to move downward through the gate plate connector 5 and the pin 6. Since a suitable spring 3 is installed between the two gate plates 2, and the spring 3 is a compression spring, the spring force acts evenly on the two gate plates 2, so that the two gate plates 2 are always attached to the valve seat sealing surface of the valve body 1 during the movement, playing a guiding and positioning role; when the gate plates 2 move down to the right position, the sealing surface of the gate plates 2 is completely consistent with the valve seat sealing surface of the valve body 1. At this time, the elastic force of the spring 3 plays an auxiliary sealing role to cut off the medium in the pipeline.

[0024] When the medium in the pipeline needs to flow, the power device drives the valve stem 7 to move upward, and the valve stem 7 drives the two gates 2 to move upward along the valve seat sealing surface of the valve body 1 through the gate connector 5 and the pin 6. When the gate 2 moves up to the right position, the sealing surface of the gate 2 is basically separated from the upper sealing surface of the valve body 1, and only the sealing surface at the lower end of the gate 2 is in contact with the valve seat sealing surface of the valve body 1, so as to play a guiding role when moving downward.

[0025] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A spring-loaded double-disc valve, comprising a valve body (1), characterized in that: The valve cover (15) is fixed to the upper part of the valve body (1), and the valve stem (7) passes through the valve cover (15) from top to bottom; the lower end of the valve stem (7) is fixedly connected to two gate plates (2) located inside the valve body (1) via a gate plate connector (5) and a plate connector (4); the upper ends of the two gate plates (2) are clamped via the plate connector (4), and a spring (3) is provided between the two gate plates (2); the outer sealing surfaces of the two gate plates (2) are respectively in close contact with the sealing surfaces of the valve seats inside the valve body (1).

2. A spring-loaded double-disc valve according to claim 1, characterized in that: The gate connecting member (5) is fixed to the lower end of the valve stem (7), and the lower end of the gate connecting member (5) is fixedly connected to the upper end of the plate connector (4); the gate connecting member (5) is fixed to the valve stem (7) via a pin shaft (6); and the two ends of the spring (3) are respectively fixedly connected to the sides of the two gates (2) away from the valve body (1).

3. A spring type double gate valve according to claim 1, characterized in that: The lower part of the valve cover (15) is fixed to the interior of the valve body (1) via a positioning ring (12), a second positioning seat (13), and a sealing ring (14), wherein the sealing ring (14) is sleeved on the outside of the valve cover (15), the second positioning seat (13) is arranged above the sealing ring (14), the positioning ring (12) is located above the second positioning seat (13), and the positioning ring (12) is fixed in a concave groove on the inner side of the valve body (1).

4. A spring type double gate valve according to claim 1, characterized in that: A pressure plate (9) is arranged above the valve cover (15), and the pressure plate (9) is slidably sleeved on the outside of the valve stem (7); the pressure plate (9) is fixedly connected to a first positioning seat (8) fixed to the outside of the upper end of the valve cover (15) by bolts; a sealing packing (11) is arranged between the valve cover (15) and the valve stem (7), and a pressure cover (10) is arranged above the sealing packing (11), and the pressure cover (10) is fixed to the lower surface of the pressure plate (9).

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