Low-torque gate valve

Abstract

The utility model discloses a low-torque gate valve, which relates to the technical field of valves, and comprises a valve body, a valve rod, a valve seat and a gate plate, 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 form sealing fit with the gate plate, and the valve rod is arranged in the valve body. The gate plate is formed by connecting a left gate plate and a right gate plate in a rotary inserting mode, a driving groove is formed in the middle of the two gate plates, an opening mechanism is arranged in the driving groove and comprises a supporting plate and a crank, and the supporting plate is in transmission connection with the bottom of the valve rod through the crank. The valve rod moves up and down to drive the supporting plate to be away from the side wall of the driving groove or abut against the inner wall of the driving groove so as to open the double gate plates. When the gate valve is opened or closed, no friction exists between the gate plate and the valve seat, the opening and closing torque of the valve is reduced, and the service life of the valve is effectively prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a low-torque gate valve. Background Art

[0002] Gate valves generally use wedge-type gates or parallel gates as opening and closing parts, which rely on fluid pressure and wedge force to seal the medium flow channel of the valve. At present, wedge-type gate valves have been widely used in water supply and drainage, heating, electricity, environmental protection and other transmission lines. The existing wedge-type gate valves have problems such as large opening and closing torque and easy damage of the valve disc and valve seat because the valve disc and valve body seat are forced to contact and frictionally seal at a 5° bevel angle at the moment of opening and closing. Summary of the invention

[0003] In view of the deficiencies in the prior art, the utility model provides a low-torque gate valve.

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

[0005] A low-torque gate valve comprises a valve body, a valve stem, a valve seat and a gate plate. The valve body is provided with a medium channel. The gate plate can be movably arranged in the valve body 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. The gate plate is a left and right double gate plate connected by screwing. A driving groove is provided in the middle of the double gate plates. An opening mechanism is provided in the driving groove. The opening mechanism comprises a support plate and a crank. The support plate is transmission-connected to the bottom of the valve stem through the crank. The up and down movement of the valve stem will drive the support plate away from the side wall of the driving groove or press against the inner wall of the driving groove to open the double gate plates.

[0006] The side wall of the driving groove is wavy, and the outer side of the support plate is adapted to the wavy side wall of the driving groove.

[0007] A driving part is provided at the lower end of the valve stem, and the outer edge of the driving part is arranged corresponding to the upper inner wall of the driving groove.

[0008] The valve body is provided with a valve cover, and the valve cover is detachably connected to the valve body via bolts.

[0009] A sealing gasket is arranged between the valve cover and the valve body.

[0010] A packing is arranged between the valve cover and the valve stem, a packing gland is arranged above the packing, a packing support ring is arranged below the packing, the packing support ring is connected to the valve cover by threads, a packing pressure plate is arranged above the packing gland, and the packing pressure plate presses the packing by means of a movable bolt.

[0011] An elastic portion is disposed at the lower end of the gate plate, and the elastic portion is U-shaped.

[0012] The beneficial effects of the utility model are as follows: the utility model arranges a driving groove in the middle of the double gate plates, and arranges an opening mechanism in the driving groove. The up and down movement of the valve stem will drive the opening mechanism away from the side wall of the driving groove or press against the inner wall of the driving groove to open the double gate plates, so that when the valve is opened or closed, there is no friction between the gate plate and the valve seat, thereby reducing the valve opening and closing torque and effectively extending the service life of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic cross-sectional structure diagram of an embodiment of the utility model;

[0014] Figure 2 for Figure 1 A partial enlarged view of . DETAILED DESCRIPTION

[0015] The embodiments of the present utility model will be further described below in conjunction with the accompanying drawings.

[0016] like Figure 1 As shown, a low torque gate valve comprises a valve body 1, a valve stem 2, a valve seat 5, and a gate plate 3. The valve body 1 is provided with a medium channel 14. The gate plate 3 can be movably arranged in the valve body 1 in a direction perpendicular to the medium channel 14. The valve seat 5 is arranged in the medium flow channel 14 and can form a sealing match with the gate plate 3. The gate plate 3 is a left and right double gate plate screw-connected. A driving groove 12 is provided in the middle of the double gate plate. A propping mechanism 13 is provided in the driving groove 12. A valve cover 4 is provided on the valve body 1. The valve cover 4 is detachably connected to the valve body 1 by bolts. For easy disassembly and maintenance, a sealing gasket is provided between the valve cover 4 and the valve body 1, a packing 7 is provided between the valve cover 4 and the valve stem 2, a packing gland 8 is provided above the packing 7, a packing support ring 6 is provided below the packing 7, the packing support ring 6 is connected to the valve cover 4 by threads, a packing pressure plate 9 is provided above the packing pressure cap 8, and the packing pressure plate 9 compresses the packing by a live bolt 10 to ensure that the medium will not leak from the fitting between the valve cover 4 and the valve body 1, and the fitting between the valve cover 4 and the valve stem 2, thereby ensuring the reliability of the valve sealing.

[0017] like Figure 2As shown, the support mechanism includes a support plate 25 and a crank 24. The support plate 25 is connected to the bottom of the valve stem 2 through the crank 24. A driving part 22 is provided at the lower end of the valve stem 2. The outer edge of the driving part 22 is inclined and corresponds to the upper inner wall 21 of the driving groove 12. When the valve is closed, the valve stem 2 moves downward, the lower end of the support plate 25 contacts the bottom of the driving groove 12, and the valve stem 2 continues to move downward. Under the action of the crank 24, the support plate 25 moves laterally in a direction away from the center of the valve stem 2, and the double gates are supported so that the sealing surface of the gates and the valve seat 5 form a sealing fit; when the valve is opened, the valve stem 2 moves upward, the support plate 25 moves laterally in the direction of the center of the valve stem 2, and no longer presses the gate. The valve stem 2 continues to move upward, and the upper end of the driving part 22 contacts the upper inner wall 21 of the driving groove, thereby driving the entire gate to rise, completing the opening of the valve. When the valve is opened or closed, there is no friction between the gate and the valve seat, which reduces the valve opening and closing torque and effectively extends the service life of the valve.

[0018] In this embodiment, the side wall 23 of the driving groove 14 is wavy, and the outer side of the support plate 25 is adapted to the wavy driving groove side wall 23, so that the support plate 25 will not slide when pressing against the driving groove side wall 23, ensuring the reliability of the gate opening and the sealing of the valve.

[0019] In this embodiment, an elastic portion 15 is provided at the lower end of the gate plate. The elastic portion 15 is U-shaped. The elastic portion 15 causes the originally squeezed gate plate 3 to exert an outward force on the inner surface of the valve seat 5 to resist the squeezing of the gate plate 3 by the inner surface of the valve seat 5 and prevent the gate plate 3 from deforming.

[0020] The embodiments should not be regarded as limiting the present invention, and any non-creative improvements made based on the spirit of the present invention should be regarded as falling within the protection scope of the present invention.

Claims

1. A low torque gate valve, comprising a valve body, a valve stem, a valve seat, and a gate plate, 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 passage and can form a sealing fit with the gate plate, characterized in that: The gate plate is a left and right double gate plate connected by screwing, a driving groove is provided in the middle of the double gate plate, and an opening mechanism is provided in the driving groove. The opening mechanism includes a support plate and a crank. The support plate is connected to the bottom of the valve stem through the crank. The up and down movement of the valve stem will drive the support plate away from the side wall of the driving groove or press against the inner wall of the driving groove to open the double gate plates.

2. A low torque gate valve according to claim 1, characterized in that: The side wall of the driving groove is wavy, and the outer side of the support plate is adapted to the wavy side wall of the driving groove.

3. A low torque gate valve according to claim 1, characterized in that: A driving part is provided at the lower end of the valve stem, and the outer edge of the driving part is arranged corresponding to the upper inner wall of the driving groove.

4. A low torque gate valve 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.

5. A low torque gate valve according to claim 4, characterized in that: A sealing gasket is arranged between the valve cover and the valve body.

6. A low torque gate valve according to claim 4, characterized in that: A packing is arranged between the valve cover and the valve stem, a packing gland is arranged above the packing, a packing support ring is arranged below the packing, the packing support ring is connected to the valve cover by threads, a packing pressure plate is arranged above the packing gland, and the packing pressure plate presses the packing by means of a movable bolt.

7. A low torque gate valve according to claim 1, characterized in that: An elastic portion is disposed at the lower end of the gate plate, and the elastic portion is U-shaped.

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