Wedge gate valve

Abstract

A wedge gate valve comprises a valve body (1), a valve cover (2), a valve rod (3) and a packing pressing plate (4), the valve cover (2) is installed at the top of the valve body (1), a valve plate (5) is arranged at the bottom of the valve rod (3), the valve rod (3) is installed in the valve cover (2) through a packing sealing ring (6), the valve plate (5) is located in the valve body (1), a packing pressing sleeve (7) is arranged at the top of the packing sealing ring (6), a pressing ring (8) is arranged on the upper portion of the packing pressing sleeve (7), and the top of the pressing ring (8) is an arc-shaped protrusion. The utility model has the advantages that the packing is tightly sealed and pressed and is not easy to loosen, the service life of the valve rod nut is long, and lubricating oil can be added as required.

Description

Technical Field

[0001] The utility model relates to the field of valve equipment, and particularly relates to a wedge gate valve. Background Art

[0002] At present, the gate valve is an important control component in the fluid transportation system and has the function of opening and closing the flow of the medium in the pipeline. During the opening and closing process of the gate valve, the gap between the outer wall of the valve stem and the inner wall of the valve cover needs to be sealed through packing seal. The packing seal needs to be tightened through a packing gland. There is a lack of positioning on the contact surface between the existing packing gland and the pressure ring, resulting in easy loosening and affecting the sealing effect. The existing valve stem nut is prone to difficult screwing after long-term use. There is a lack of a wedge gate valve with a long service life and capable of adding lubricating oil. Content of the Utility Model

[0003] The purpose of the utility model is to provide a wedge gate valve aiming at the above deficiencies.

[0004] The utility model includes a valve body, a valve cover, a valve stem and a packing pressing plate.

[0005] The valve cover is installed on the top of the valve body. A valve plate is arranged at the bottom of the valve stem. The valve stem is installed in the valve cover through a packing seal ring. The valve plate is located inside the valve body. A packing sleeve is arranged at the top of the packing seal ring. A pressure ring is arranged above the packing sleeve. The top of the pressure ring is an arc-shaped protrusion. A through hole is opened in the middle of the packing pressing plate. The valve stem is located in the through hole. An arc-shaped groove matching the arc-shaped protrusion is opened at the bottom of the through hole of the packing pressing plate. The packing pressing plate presses on the pressure ring and is fixed on the top of the valve cover through a pair of bolts. Rotating the valve stem drives the valve plate to rise or fall.

[0006] A nut support is arranged on the top of the valve cover. A nut installation groove is opened at the top of the nut support. The valve stem nut is movably installed in the nut installation groove through a bearing. External threads are arranged on the outer wall of the upper part of the valve stem. The upper part of the valve stem is threadedly installed in the valve stem nut. A handwheel is arranged above the valve stem nut. Rotating the handwheel drives the valve stem nut to rotate in the nut installation groove. The valve stem nut drives the valve stem to rise or fall.

[0007] The nut support is detachably installed on the top of the valve cover through bolts.

[0008] A support ring is arranged on the valve stem nut. Centripetal thrust bearings are respectively arranged at the top and bottom of the support ring. The valve stem nut is movably installed in the nut installation groove through the centripetal thrust bearings. The upper centripetal thrust bearing is pressed tightly through a bearing gland.

[0009] An oil filling port is opened on the inner wall of the nut installation groove. A plug is arranged on the oil filling port.

[0010] A pair of guiding protrusions are symmetrically arranged on the inner wall of the valve body. Guiding grooves matching the guiding protrusions are respectively arranged on both sides of the valve plate.

[0011] A drain pipe is provided on the valve body below the valve plate, and a stop valve is provided on the drain pipe.

[0012] The advantages of the present utility model are: the packing seal is tightly pressed, not easily loosened, the service life of the valve stem nut is long, and lubricating oil can be added as needed. Description of the Drawings

[0013] Figure 1 It is a schematic cross-sectional structure view of the present utility model.

[0014] Figure 2 It is a schematic structure view of the packing seal ring of the present utility model.

[0015] Figure 3 It is a schematic structure view of the valve stem nut of the present utility model. Detailed Embodiments

[0016] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0017] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0018] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0019] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention. In addition, in the description of the present invention, if terms such as "first", "second", etc. are used only for distinguishing descriptions, they cannot be construed as indicating or implying relative importance.

[0020] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and defined, if the terms "set" and "connected" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0021] As shown in the attached drawings, the utility model includes a valve body 1, a valve cover 2, a valve stem 3 and a packing gland 4.

[0022] The valve cover 2 is installed on the top of the valve body 1. A valve plate 5 is arranged at the bottom of the valve stem 3. The valve stem 3 is installed in the valve cover 2 through a packing seal ring 6. The valve plate 5 is located inside the valve body 1. A packing sleeve 7 is arranged at the top of the packing seal ring 6. A pressure ring 8 is arranged above the packing sleeve 7. The top of the pressure ring 8 is an arc-shaped protrusion. A through hole is opened in the middle of the packing gland 4. The valve stem 3 is located in the through hole. An arc-shaped groove matching the arc-shaped protrusion is opened at the bottom of the through hole of the packing gland 4. The packing gland 4 presses on the pressure ring 8 and is fixed on the top of the valve cover 2 by a pair of bolts. Rotating the valve stem 3 drives the valve plate 5 to rise or fall.

[0023] A nut bracket 9 is arranged on the top of the valve cover 2. A nut installation groove is opened at the top of the nut bracket 9. The valve stem nut 10 is movably installed in the nut installation groove through a bearing. An external thread is arranged on the outer wall of the upper part of the valve stem 3. The upper part of the valve stem 3 is threadedly installed in the valve stem nut 10. A handwheel 11 is arranged above the valve stem nut 10. Rotating the handwheel 11 drives the valve stem nut 10 to rotate in the nut installation groove, and the valve stem nut 10 drives the valve stem 3 to rise or fall.

[0024] The nut bracket 9 is detachably installed on the top of the valve cover 2 through bolts.

[0025] A support ring is arranged on the valve stem nut 10. Centripetal thrust bearings 12 are respectively arranged at the top and bottom of the support ring. The valve stem nut 10 is movably installed in the nut installation groove through the centripetal thrust bearings 12, and the upper centripetal thrust bearing 12 is pressed by a bearing gland 13.

[0026] An oil filling port is opened on the inner wall of the nut installation groove, and a plug 14 is arranged on the oil filling port.

[0027] A pair of guiding protrusions are symmetrically arranged on the inner wall of the valve body 1, and guiding grooves matching the guiding protrusions are respectively arranged on both sides of the valve plate 5.

[0028] A sewage discharge pipe is arranged on the valve body 1 below the valve plate 5, and a stop valve is arranged on the sewage discharge pipe.

[0029] Embodiment 1: When opening the valve, rotate the handwheel 11 in the forward direction. The handwheel 11 drives the valve stem nut 10 to rotate. The valve stem nut 10 is supported by a pair of angular contact thrust bearings 12, enabling the valve stem nut 10 to rotate smoothly between the bearing gland 13 and the inner bottom surface of the nut installation groove. When the valve stem nut 10 rotates, it drives the valve stem 3 upward through thread matching, causing the valve plate 5 to rise and opening the inner cavity of the valve body 1. When closing the valve, rotate the handwheel 11 in the reverse direction. The handwheel 11 drives the valve stem nut 10 to rotate. When the valve stem nut 10 rotates, it drives the valve stem 3 downward through thread matching, causing the valve plate 5 to lower and closing the inner cavity of the valve body 1. When the packing gland 4 presses the packing ring 8, the arc-shaped protrusion of the packing ring 8 is located in the arc-shaped groove of the packing gland 4, making the packing gland 4 more accurate when being pressed and not easily loosening.

Claims

1. A wedge gate valve, characterized in that It comprises a valve body (1), a valve cover (2), a valve stem (3) and a packing pressure plate (4). The valve cover (2) is mounted on the top of the valve body (1), a valve plate (5) is arranged at the bottom of the valve stem (3), the valve stem (3) is mounted in the valve cover (2) through a packing seal ring (6), the valve plate (5) is located in the valve body (1), a packing gland (7) is arranged on the top of the packing seal ring (6), a pressure ring (8) is arranged on the upper part of the packing gland (7), the top of the pressure ring (8) is an arc-shaped protrusion, a through hole is opened in the middle of the packing pressure plate (4), the valve stem (3) is located in the through hole, an arc-shaped groove matching the arc-shaped protrusion is opened at the bottom of the through hole of the packing pressure plate (4), the packing pressure plate (4) is pressed on the pressure ring (8), and is fixed to the top of the valve cover (2) by a pair of bolts, and the valve stem (3) is rotated to drive the valve plate (5) to rise or fall.

2. A wedge gate valve according to claim 1, characterized in that: A nut bracket (9) is arranged on the top of the valve cover (2), a nut mounting groove is opened on the top of the nut bracket (9), a valve stem nut (10) is movably installed in the nut mounting groove through a bearing, an outer thread is arranged on the upper outer wall of the valve stem (3), the upper thread of the valve stem (3) is installed in the valve stem nut (10), a hand wheel (11) is arranged on the upper part of the valve stem nut (10), and the hand wheel (11) is turned to drive the valve stem nut (10) to rotate in the nut mounting groove, and the valve stem nut (10) drives the valve stem (3) to rise or fall.

3. A wedge gate valve according to claim 2, characterized in that: The nut bracket (9) is detachably mounted on the top of the valve cover (2) by means of bolts.

4. A wedge gate valve according to claim 3, characterized in that: A support ring is arranged on the valve stem nut (10), and radial thrust bearings (12) are arranged on the top and bottom of the support ring respectively. The valve stem nut (10) is movably installed in the nut installation groove through the radial thrust bearing (12), and the radial thrust bearing (12) above is pressed by the bearing pressure cover (13).

5. A wedge gate valve according to claim 4, characterized in that: A lubricating oil inlet is provided on the inner wall of the nut installation groove, and a plug (14) is provided on the lubricating oil inlet.

6. A wedge gate valve according to claim 1, characterized in that: A pair of guide protrusions are arranged on the inner wall of the valve body (1) in a mirror-image distribution, and guide grooves matching the guide protrusions are respectively arranged on both sides of the valve plate (5).

7. A wedge gate valve according to claim 1, characterized in that: A sewage discharge pipe is arranged on the valve body (1) below the valve plate (5), and a stop valve is arranged on the sewage discharge pipe.

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