Novel gate valve

Abstract

The utility model discloses a novel gate valve which aims to solve the problem that when a rising stem type parallel gate plate gate valve in the prior art is opened, and the lifting height of a valve plate is equal to 1: 1 time of the drift diameter of the valve, a fluid channel is completely opened and unblocked. However, in the operation process, the position cannot be monitored, in a traditional method, the position where a valve rod does not ascend serves as the fully-open position of the valve rod, but in consideration of temperature changes, the locking phenomenon is likely to occur, and operation of the gate valve is greatly affected. A parallel valve seat sealing ring is arranged in the valve body, the valve cover is connected with the valve body in a sealing mode, and the valve rod penetrates through the valve cover and can move in the direction perpendicular to the fluid flowing direction. A parallel valve plate fixedly connected with the bottom end of the valve rod is arranged in the valve body; a support is fixedly connected to the upper portion of the valve deck, and the support and the valve deck are integrally formed and connected. A valve rod nut matched with the trapezoidal thread of the valve rod is arranged at the top of the bracket; the top of the valve rod nut is fixedly connected with a hand wheel through a locking nut.

Description

Technical Field

[0001] The utility model relates to the technical field of valve equipment, in particular to a novel gate valve. Background Art

[0002] Gate valve is a kind of valve widely used in pipeline system, mainly used to control the opening and closing of fluid. Gate valve is usually composed of valve body, valve plate, valve seat, valve cover, valve stem and valve stem nut. The movement direction of the gate plate is perpendicular to the direction of the fluid. Gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled.

[0003] Traditional gate valves are divided into rising stem parallel disc gate valves from the structural point of view. This type of gate valve is widely used in low-pressure large-diameter pipeline systems due to its excellent performance and wide applicability. When the valve is opened, when the valve plate lifting height is equal to 1:1 times the valve diameter, the fluid channel is completely open and unobstructed. However, this position cannot be monitored during operation. In the traditional method, the position where the valve stem cannot rise is taken as its fully open position, but considering the temperature change, it is easy to lock, which greatly affects the operation of the gate valve. Secondly, this type of gate valve mainly uses packing and packing gland to ensure the sealing performance of the gate valve to prevent medium leakage. The existing connection between the packing gland and the valve cover is often fixed by bolts at both ends of the packing gland. During the tightening process, because the gap between the packing gland and the valve cover is filled with sealing packing, it is easy to cause the packing gland locking position to be unbalanced, affecting the sealing effect. Utility Model Content

[0004] The purpose of the utility model is to provide a new type of gate valve to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A new type of gate valve, comprising a valve body with a built-in parallel valve seat sealing ring, a valve cover sealed to the valve body and a valve stem passing through the valve cover and displaceable in a direction perpendicular to the fluid flow direction; the valve body is built with a parallel valve plate fixedly connected to the bottom end of the valve stem; a bracket is fixedly connected to the top of the valve cover, and the two are integrally formed and connected; a valve stem nut matching the trapezoidal thread of the valve stem is provided on the top of the bracket; a handwheel is fixedly connected to the top of the valve stem nut via a locking nut; a sealing packing gland is fixedly connected to the place where the valve stem passes through the valve cover; the packing gland is fixedly threadedly connected to the valve cover via bolts at both ends.

[0007] When the valve is opened and closed, rotate the handwheel, and the valve stem nut rotates accordingly, thereby driving the valve stem to move perpendicular to the fluid flow direction, and then driving the parallel valve plate to move linearly perpendicular to the fluid flow direction; when the parallel valve plate descends, the sealing surface of the parallel valve plate is in close contact with the sealing surface of the parallel valve seat sealing ring, and the fluid passage is sealed; when the parallel valve plate ascends, the sealing surface of the parallel valve plate is separated from the sealing surface of the parallel valve seat sealing ring, and the fluid passage is opened; as the parallel valve plate ascends, when the parallel valve plate is at the position where the fluid passage is just completely opened, a marked through hole is provided parallel to the top surface of the locking nut in the length direction of the valve stem. At this time, the valve stem still has room to continue ascending relative to the valve stem nut; the marked through hole is perpendicular to the axial center line of the valve stem and intersects with the axial center line of the valve stem.

[0008] Preferably, the inner wall of the marked through hole is coated with a warning pigment layer.

[0009] Preferably, the warning pigment layer can be selected from red or yellow.

[0010] Preferably, a pair of symmetrically arranged limiting grooves are provided on the side wall of the packing gland; two limiting protrusions respectively matching the limiting grooves are fixedly provided on the bracket; during installation, the limiting grooves of the packing gland are in limiting abutment with the limiting protrusions of the bracket.

[0011] Preferably, the corners of the limiting grooves and the limiting protrusions are all rounded.

[0012] Compared with the prior art, a novel gate valve of the present application has the following beneficial effects:

[0013] The gate valve of the present utility model adopts an exposed stem structure. When the parallel valve plate is at the position where the fluid passage is just completely opened, the marked through hole on the valve stem is exactly parallel to the top surface of the locking nut, which is convenient for the operator to observe, so there is no need to raise the valve stem to the position where it cannot be raised anymore, preventing the problem of valve stem locking in case of temperature change. In addition, matching limiting grooves and limiting protrusions for guiding and limiting functions are respectively provided on the packing gland and the bracket. During installation, the balance of the packing gland can be ensured, preventing the situation of one end being high and the other end being low, and ensuring the sealing effect of the packing. BRIEF 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 structural diagram of the fully closed state of the gate plate in the embodiment of the present utility model;

[0016] Figure 3 is Figure 2 a sectional view taken along line AA in

[0017] Figure 4 It is a schematic structural diagram when the middle gate plate is fully opened in the embodiment of the present utility model;

[0018] Figure 5 It is Figure 4 a cross-sectional view taken along line BB;

[0019] Figure 6 It is Figure 3 an enlarged view of area C;

[0020] Figure 7 It is Figure 5 an enlarged view of area D;

[0021] Figure 8 It is a schematic structural diagram of the connection structure between the valve stem and the parallel valve plate in the embodiment of the present utility model;

[0022] Figure 9 It is an exploded view of the connection structure among the packing gland, the valve seat and the bracket in the embodiment of the present utility model.

[0023] Reference numerals: 1, valve body; 11, parallel valve seat sealing ring; 2, bolt; 3, valve cover; 4, valve stem; 41, marking through hole; 42, lock nut; 5, parallel valve plate; 6, bracket; 61, limit rib; 7, valve stem nut; 8, handwheel; 9, packing gland; 91, limit groove. Specific embodiments

[0024] The following is a further detailed description through specific embodiments:

[0025] Embodiment 1

[0026] As Figure 1-8 shown, this embodiment shows a new type of gate valve with an exposed stem structure, including a valve body 1 with an internal parallel valve seat sealing ring 11, a valve cover 3 sealingly connected to the valve body 1, and a valve stem 4 passing through the valve cover 3 and displaceable along a direction perpendicular to the fluid flow direction; a parallel valve plate 5 fixedly connected to the bottom end of the valve stem 4 is arranged inside the valve body 1, and the parallel valve seat sealing ring 11 and the parallel valve plate 5 are matched to form a fluid channel sealing surface; a bracket 6 is fixedly connected above the valve cover 3, and the two are integrally formed and connected; a valve stem nut 7 matching the trapezoidal thread of the valve stem 4 is arranged at the top of the bracket 6; a handwheel 8 is fixedly connected to the top of the valve stem nut 7 through a lock nut 42; a packing gland 9 for sealing is fixedly connected at the place where the valve stem 4 passes through the valve cover 3, and packing is filled between the valve cover 3 and the packing gland 9 to ensure the sealing performance of the gate valve and prevent medium leakage; the packing gland 9 is fixedly connected to the valve cover 3 by bolts 2 at both ends thereof through threaded connection.

[0027] In this embodiment, when the valve is opened or closed, the handwheel 8 is rotated, and the valve stem nut 7 rotates accordingly, thereby driving the valve stem 4 to move perpendicular to the fluid flow direction, and then driving the parallel valve plate 5 to move linearly perpendicular to the fluid flow direction. As is well known, a gate valve can only be fully opened and fully closed, and cannot be used for regulation and throttling. When the parallel valve plate 5 descends, the sealing surface of the parallel valve plate 5 is in close contact with the sealing surface of the parallel valve seat sealing ring 11, and the fluid passage is sealed, and it is in the fully closed state at this time. When the parallel valve plate 5 ascends, the sealing surface of the parallel valve plate 5 is separated from the sealing surface of the parallel valve seat sealing ring 11, and the fluid passage is opened, and it is in the fully open state at this time.

[0028] As the parallel valve plate 5 ascends, when the parallel valve plate 5 is at the position where the fluid passage is just completely opened, a marked through hole 41 is provided at the position parallel to the top surface of the locking nut in the length direction of the valve stem 4. At this time, the valve stem 4 still has a margin for further ascending relative to the valve stem nut 7. The marked through hole 41 is perpendicular to the axial center line of the valve stem 4 and intersects the axial center line of the valve stem 4. Specifically, the identification through hole is provided on the valve stem 4. When the parallel valve plate 5 is just at the position where the fluid passage is completely opened, the operator can observe with the naked eye that the identification through hole on the valve stem 4 is exactly parallel to the top surface of the top locking nut 42 at this time. The operator can thus know that the fluid passage has been completely opened, and at this time, the valve stem 4 has not risen to the topmost position, that is, the position where it cannot be lifted during traditional operation. The valve stem 4 still has a certain margin for ascending relative to the valve stem nut 7. Therefore, when encountering temperature changes, the valve stem 4 will not be locked.

[0029] Furthermore, in a further feasible implementation manner of this embodiment, a warning pigment layer is coated on the inner wall of the marked through hole 41 to facilitate the operator to observe the identification through hole. Further, in these implementation manners, the warning pigment layer can be selected from red or yellow, and these two colors are conducive to the operator observing the identification through hole.

[0030] Embodiment 2

[0031] As Figure 1-9As shown, another embodiment shows a new type of gate valve, including a valve body 1 with a built-in parallel valve seat sealing ring 11, a valve cover 3 sealingly connected to the valve body 1, and a valve stem 4 passing through the valve cover 3 and displaceable perpendicular to the fluid flow direction; a parallel valve plate 5 fixedly connected to the bottom end of the valve stem 4 is built in the valve body 1; a bracket 6 is fixedly connected above the valve cover 3, and the two are integrally formed and connected; a valve stem nut 7 matching the trapezoidal thread of the valve stem 4 is provided at the top of the bracket 6; a handwheel 8 is fixedly connected to the top of the valve stem nut 7 through a lock nut 42; a packing gland 9 for sealing is fixedly connected at the place where the valve stem 4 passes through the valve cover 3; the packing gland 9 is fixedly threadedly connected to the valve cover 3 through bolts 2 at both ends thereof. When the valve is opened and closed, the handwheel 8 is rotated, and the valve stem nut 7 rotates accordingly, thereby driving the valve stem 4 to move along a direction perpendicular to the fluid flow direction, and then driving the parallel valve plate 5 to move linearly along a direction perpendicular to the fluid flow direction; when the parallel valve plate 5 descends, the sealing surface of the parallel valve plate 5 is in close contact with the sealing surface of the parallel valve seat sealing ring 11, and the fluid passage is sealed; when the parallel valve plate 5 ascends, the sealing surface of the parallel valve plate 5 is separated from the sealing surface of the parallel valve seat sealing ring 11, and the fluid passage is opened; as the parallel valve plate 5 ascends, when the parallel valve plate 5 is at the position where the fluid passage is just fully opened, a marked through hole 41 is provided at the place where the valve stem 4 is parallel to the top surface of the lock nut in the length direction, and at this time, the valve stem 4 still has a margin for further ascending relative to the valve stem nut 7; the marked through hole 41 is perpendicular to the axial center line of the valve stem 4 and intersects with the axial center line of the valve stem 4.

[0032] Further illustration, in a further implementable manner of this embodiment, as Figure 9 shown, a pair of symmetrically arranged limit grooves 91 are provided on the side wall of the packing gland 9; two limit ridges 61 respectively matching the limit grooves 91 are fixedly provided on the bracket 6; during installation, the limit grooves 91 of the packing gland 9 are in limit abutment with the limit ridges 61 of the bracket 6, and this structure can ensure the balance of the packing gland 9, prevent the situation of one end being high and the other end being low, and ensure the sealing effect of the packing. Further, in these embodiments, the corners of the limit grooves 91 and the limit ridges 61 are all rounded for easy installation.

[0033] The above are only the embodiments of the present invention, and common knowledge such as specific structures and characteristics known in the solutions is not described in detail herein. It should be noted that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can still be made, and these should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent. The protection scope required by this application should be subject to the content of its claims, and the specific implementation manners and the like recorded in the specification can be used to interpret the content of the claims.

Claims

1. A new type of gate valve, characterized in that: It includes a valve body with a built-in parallel valve seat seal ring, a valve cover sealingly connected to the valve body, and a valve stem passing through the valve cover and displaceable perpendicular to the fluid flow direction; a parallel valve plate fixedly connected to the bottom end of the valve stem is built in the valve body; a bracket is fixedly connected above the valve cover, and the two are integrally formed and connected; a valve stem nut matching the trapezoidal thread of the valve stem is provided at the top of the bracket; a handwheel is fixedly connected to the top of the valve stem nut through a locking nut; a stuffing gland for sealing is fixedly connected at the place where the valve stem passes through the valve cover; the stuffing gland is fixedly threadedly connected to the valve cover through bolts at both ends thereof; When the valve is opened and closed, the handwheel is rotated, and the valve stem nut rotates accordingly, thereby driving the valve stem to move perpendicular to the fluid flow direction, and then driving the parallel valve plate to move linearly perpendicular to the fluid flow direction; when the parallel valve plate descends, the sealing surface of the parallel valve plate is in close contact with the sealing surface of the parallel valve seat seal ring, and the fluid passage is sealed; when the parallel valve plate ascends, the sealing surface of the parallel valve plate is separated from the sealing surface of the parallel valve seat seal ring, and the fluid passage is opened; as the parallel valve plate ascends, when the parallel valve plate is at the position where the fluid passage is just completely opened, a marked through hole is provided at the position parallel to the top surface of the locking nut in the length direction of the valve stem, and at this time, the valve stem still has a margin for continuing to ascend relative to the valve stem nut; the marked through hole is perpendicular to the axial center line of the valve stem and intersects with the axial center line of the valve stem.

2. A novel gate valve according to claim 1, characterized in that: A warning pigment layer is coated on the wall of the marked through hole.

3. A novel gate valve according to claim 2, characterized in that: The warning pigment layer can be selected from red or yellow.

4. A novel gate valve according to claim 1, characterized in that: A pair of symmetrically arranged limiting grooves are provided on the side wall of the stuffing gland; two limiting ridges respectively matching the limiting grooves are fixedly provided on the bracket; during installation, the limiting grooves of the stuffing gland are in limiting abutment with the limiting ridges of the bracket.

5. A novel gate valve according to claim 4, characterized in that: The corners of the limiting grooves and the limiting ridges are all rounded.

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