Stop valve capable of reducing total resistance

Abstract

The utility model discloses a stop valve capable of reducing total resistance, which relates to the technical field of valves and comprises a valve body which is divided into a low-position inlet cavity and a high-position outlet cavity, a partition plate is provided with a communicating hole for the low-position inlet cavity and the high-position outlet cavity, and the stop valve further comprises a valve rod which can longitudinally penetrate through the upper side wall of the valve and the communicating hole and enter the low-position inlet cavity. The bottom end of the valve rod is connected with a blocking piece of an inverted-T-shaped structure, the outer wall of the valve rod is slidably sleeved with a valve plug used for blocking the communicating hole, a pressure relief hole of an I-shaped structure is formed in the side wall of the valve rod, and the blocking piece selectively abuts against the bottom wall of the valve plug to be used for opening and closing an opening, located in the low-position inlet cavity, of the pressure relief hole. The pressure relief hole in the valve rod is used for forming a pressure relief channel in the low-position inlet cavity and the high-position outlet cavity, fluid in the low-position inlet cavity can be guided into the high-position outlet cavity through the pressure relief hole, the impact force of the fluid in the low-position inlet cavity for flushing the valve plug is reduced, and the resistance of the valve plug abutting against the opening in the bottom end of the communicating hole from the low-position inlet cavity and blocking the communicating hole is reduced; meanwhile, the rotating resistance of the rotating valve rod is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a stop valve capable of reducing total resistance. Background Art

[0002] The stop valve, also known as the gate valve, is a forced sealing valve. Therefore, when the valve is closed, pressure must be applied to the valve disc to force the sealing surface to prevent leakage. Since the valve stem of this type of valve has a relatively short opening or closing stroke and has a very reliable cutting function, it is very suitable for cutting, regulating and throttling.

[0003] The existing large-diameter stop valve has a large valve disc area for switching fluid channels, is subjected to high pressure, requires a large torque when opening and closing, has large rotation resistance, is laborious and time-consuming, and is very inconvenient to use, thereby reducing its use effect. Therefore, a stop valve that can reduce the total resistance is designed here to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a stop valve capable of reducing total resistance, so as to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: a stop valve capable of reducing total resistance, comprising a valve body, one end of the valve body is an inlet, and the other end is an outlet, a partition is provided in the valve body, the partition is circumferentially extended along the inner wall of the valve body and is divided into a low-position inlet cavity and a high-position outlet cavity, and a communicating hole between the low-position inlet cavity and the high-position outlet cavity is opened on the partition;

[0006] It also includes a valve stem that can longitudinally pass through the upper side wall of the valve and the connecting hole and enter the low-position inlet cavity, the bottom end of the valve stem is connected to a blocking piece of an inverted T-shaped structure, the outer wall of the valve stem is slidably sleeved with a valve plug for blocking the connecting hole, and the side wall of the valve stem is provided with an I-shaped pressure relief hole, one end of the pressure relief hole is opened in the high-position outlet cavity, and the other end of the pressure relief hole is opened in the low-position inlet cavity, the openings at both ends of the pressure relief hole connect the low-position inlet cavity and the high-position outlet cavity to form a pressure relief channel, and the blocking piece selectively abuts against the bottom wall of the valve plug to open and close the opening of the pressure relief hole located in the low-position inlet cavity.

[0007] In a further embodiment, a docking seat is extended upward from the upper end of the valve body, a threaded docking ring is fixed on the docking seat, a valve cover is threadedly connected to the threaded docking ring, a valve stem is threadedly inserted into the valve cover, a sealing rubber sleeve is fixed in the docking seat, and the sealing rubber sleeve is provided with a sealing plug hole that is slidably fitted with the outer wall of the valve stem.

[0008] In a further embodiment, the valve plug is provided with a sliding hole of an inverted T-shaped structure, and the end side wall of the blocking piece can be embedded in the bottom opening of the sliding hole and fit with the inner wall of the bottom opening of the sliding hole.

[0009] In a further embodiment, the valve stem is sleeved with an elastic member, one end of the elastic member abuts against the top wall of the bottom end of the slider of the inverted T-shaped structure, and the other end of the elastic member abuts against the side wall of the end of the blocking piece.

[0010] In a further embodiment, the elastic member is a spring or an elastic gasket.

[0011] In a further embodiment, the opening at one end of the connecting hole located at the low-position inlet cavity is a spherical structure, the upper end surface of the valve plug is a spherical structure, and the valve plug forms a surface contact against the side wall of the connecting hole opening to seal the connecting hole and block the connecting passage between the low-position inlet cavity and the high-position outlet cavity.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The utility model discloses a stop valve which can reduce the total resistance. When the connecting hole is closed, as the valve plug gradually approaches the connecting hole, the fluid flow space in the connecting hole gradually becomes smaller, the fluid flow rate further accelerates, and the resistance to the movement of the valve plug becomes larger. The pressure relief hole on the valve stem is used to form a pressure relief channel in a low-position inlet cavity and a high-position outlet cavity. The valve stem drives the valve plug to move upward. When the valve plug does not contact the connecting hole, the valve plug is away from the blocking piece. The fluid in the low-position inlet cavity is introduced into the high-position outlet cavity through the pressure relief hole, thereby reducing the impact force of the fluid in the low-position inlet cavity on the valve plug, and reducing the resistance of the valve plug from the low-position inlet cavity to the bottom end opening of the connecting hole and blocking the connecting hole. At the same time, the rotation resistance when the valve stem is rotated is reduced, thereby improving the opening and closing efficiency, and being simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0015] Figure 2 A partial cross-sectional view of an embodiment of the utility model;

[0016] Figure 3 For the utility model embodiment Figure 2 A magnified view of the structure at center;

[0017] Figure 4 It is a partial cross-sectional view of the valve stem of an embodiment of the utility model.

[0018] In the figure: 1. valve body; 11. docking seat; 12. threaded docking ring; 13. valve cover; 14. low-position inlet cavity; 15. high-position outlet cavity; 16. sealing rubber sleeve; 17. partition; 2. valve stem; 21. valve plug; 22. blocking piece; 23. elastic member; 24. pressure relief hole. DETAILED DESCRIPTION

[0019] 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.

[0020] Embodiment, this embodiment provides a stop valve capable of reducing total resistance, such as Figure 1 and Figure 2 As shown, it includes a valve body 1, one end of the valve body 1 is an inlet, and the other end is an outlet. A partition 17 is provided in the valve body 1. The partition 17 is circumferentially extended along the inner wall of the valve body 1 and is divided into a low-position inlet chamber 14 and a high-position outlet chamber 15. A connecting hole between the low-position inlet chamber 14 and the high-position outlet chamber 15 is opened on the partition 17. The fluid enters the low-position inlet chamber 14 through the inlet, is introduced into the high-position outlet chamber 15 through the connecting hole, and is finally discharged from the outlet. The above is the flow path of the fluid through the valve body 1.

[0021] It also includes a valve stem 2 that can longitudinally pass through the upper side wall of the valve and the connecting hole and enter the low-position inlet cavity 14. Specifically, a docking seat 11 extends upward from the upper end of the valve body 1, and a threaded docking ring 12 is fixed on the docking seat 11. The threaded docking ring 12 is threadedly connected to the valve cover 13, and the valve cover 13 is threadedly plugged with the valve stem 2. The valve stem 2 is threadedly connected to the valve cover 13, and the valve cover 13 is threadedly connected to the threaded docking ring 12 to form a support component that automatically forms the valve stem 2. The valve stem 2 can be rotated and lifted along the axial direction of the valve cover 13 by rotating. A sealing rubber sleeve 16 is fixed in the docking seat 11, and the sealing rubber sleeve 16 is provided with a sealing plug hole that slides and fits with the outer wall of the valve stem 2. When the valve stem 2 rotates through the sealing plug hole and enters the valve body 1, the sealing rubber sleeve 16 adopts an inverted truncated cone structure with a larger upper part and a smaller lower part. Compared with a cylindrical structure with equal diameters at the top and bottom, its radial thickness is larger and its bearing and deformation resistance capacity is stronger.

[0022] The bottom end of the valve stem 2 is connected to a blocking piece 22 of an inverted T-shaped structure, and the outer wall of the valve stem 2 is slidably sleeved with a valve plug 21 for blocking the connecting hole. Rotating the valve stem 2 can drive the valve plug 21 to rise and fall synchronously, that is, adjust the valve plug 21 closer to or farther from the connecting hole. The valve plug 21 is provided with an inverted T-shaped sliding hole, and the valve stem 2 passes through the sliding hole to connect the blocking piece 22, and the blocking piece 22 is used to prevent the valve plug 21 from detaching from the bottom end of the valve stem 2. Rotating the valve stem 2 will make the valve plug 21 press against the side wall of the bottom opening of the connecting hole. At this time, the side wall of the end of the blocking piece 22 can be embedded in the bottom opening of the sliding hole and fit with the inner wall of the bottom opening of the sliding hole, that is, the connecting hole is sealed, and the passage between the low-position inlet cavity 14 and the high-position outlet cavity 15 is blocked, that is, the fluid flow passage is closed.

[0023] The valve stem 2 is sleeved with an elastic member 23, one end of which is against the top wall of the bottom end of the slider of the inverted T-shaped structure, and the other end of the elastic member 23 is against the side wall of the end of the blocking piece 22. An I-shaped pressure relief hole 24 is provided on the side wall of the valve stem 2, one end of the pressure relief hole 24 is opened in the high-position outlet cavity 15, and the other end of the pressure relief hole 24 is opened in the low-position inlet cavity 14. The openings at both ends of the pressure relief hole 24 connect the low-position inlet cavity 14 and the high-position outlet cavity 15 to form a pressure relief channel, and the blocking piece 22 selectively presses against the bottom wall of the valve plug 21 to open and close the opening of the pressure relief hole 24 in the low-position inlet cavity 14. Figure 2 , Figure 3 as well as Figure 4 As shown, when the valve plug 21 is adjusted away from the connecting hole, the connecting hole connects the low-position inlet chamber 14 and the high-position outlet chamber 15. At this time, the valve plug 21 does not contact the side wall of the bottom opening of the connecting hole. The elastic potential energy of the elastic member 23 is used to push the valve plug 21 upward along the outer wall of the valve stem 2, so that the blocking piece 22 is separated from the bottom opening of the sliding hole of the valve plug 21, that is, a gap is left between the blocking piece 22 and the bottom wall of the valve plug 21. At this time, the pressure relief hole 24 is located in the low-position inlet chamber 14 and the opening is exposed, which is used to introduce the fluid of the low-position inlet chamber 14 into the high-position outlet chamber 15.

[0024] When closing the connecting hole, as the valve plug 21 gradually approaches the connecting hole, the fluid flow space in the connecting hole gradually becomes smaller, the fluid flow rate further accelerates, and the movement resistance of the valve plug 21 becomes greater. The pressure relief hole 24 on the valve stem 2 is used to form a pressure relief channel in the low-position inlet chamber 14 and the high-position outlet chamber 15. The valve stem 2 drives the valve plug 21 to move upward. When the valve plug 21 does not contact the connecting hole, the valve plug 21 is away from the blocking piece 22. The fluid in the low-position inlet chamber 14 will be introduced into the high-position outlet chamber 15 through the pressure relief hole 24, reducing the impact force of the fluid in the low-position inlet chamber 14 to flush the valve plug 21, reducing the resistance of the valve plug 21 from the low-position inlet chamber 14 to the bottom opening of the connecting hole and blocking the connecting hole, and at the same time reducing the rotation resistance when the valve stem 2 is rotated, thereby improving the opening and closing efficiency, and being simple and convenient.

[0025] Furthermore, the elastic member 23 here is a spring or an elastic gasket, preferably a spring. By utilizing the elasticity of the spring, the valve plug 21 has the force to slide upward along the outer wall of the valve stem 2 in real time, thereby exposing the pressure relief hole 24 located in the low-position inlet cavity 14 for fluid circulation, thereby reducing the total resistance during closing.

[0026] Moreover, the opening at one end of the connecting hole located at the low-position inlet chamber 14 is a spherical structure, and the upper end surface of the valve plug 21 is a spherical structure. The valve plug 21 is against the side wall of the connecting hole opening to form surface contact, thereby expanding the sealing surface, improving the sealing performance of the connecting hole, and blocking the connecting passage between the low-position inlet chamber 14 and the high-position outlet chamber 15.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A stop valve capable of reducing total resistance, characterized in that: The valve body (1) comprises a partition (17) arranged inside the valve body (1), the partition (17) extending along the inner wall of the valve body (1) in the circumferential direction and dividing the valve body (1) into a low-position inlet cavity (14) and a high-position outlet cavity (15), and a communication hole for the low-position inlet cavity (14) and the high-position outlet cavity (15) is opened on the partition (17); It also includes a valve stem (2) that can longitudinally pass through the upper side wall of the valve and the connecting hole and enter the low-position inlet cavity (14); the bottom end of the valve stem (2) is connected to a blocking piece (22) of an inverted T-shaped structure; the outer wall of the valve stem (2) is slidably sleeved with a valve plug (21) for blocking the connecting hole; the side wall of the valve stem (2) is provided with an I-shaped pressure relief hole (24); one end of the pressure relief hole (24) is opened in the high-position outlet cavity (15); the other end of the pressure relief hole (24) is opened in the low-position inlet cavity (14); the openings at both ends of the pressure relief hole (24) connect the low-position inlet cavity (14) and the high-position outlet cavity (15) to form a pressure relief channel; the blocking piece (22) selectively abuts against the bottom wall of the valve plug (21) to open and close the opening of the pressure relief hole (24) in the low-position inlet cavity (14).

2. The stop valve capable of reducing total resistance according to claim 1, characterized in that: A docking seat (11) extends upward from the upper end of the valve body (1), a threaded docking ring (12) is fixed on the docking seat (11), a valve cover (13) is threadedly connected to the threaded docking ring (12), a valve stem (2) is threadedly inserted into the valve cover (13), a sealing rubber sleeve (16) is fixed inside the docking seat (11), and the sealing rubber sleeve (16) is provided with a sealing insertion hole that is slidably fitted with the outer wall of the valve stem (2).

3. The stop valve capable of reducing total resistance according to claim 1, characterized in that: The valve plug (21) is provided with a sliding hole of an inverted T-shaped structure, and the end side wall of the blocking piece (22) can be embedded in the bottom opening of the sliding hole and fit in the inner wall of the bottom opening of the sliding hole.

4. The stop valve capable of reducing total resistance according to claim 3, characterized in that: The valve stem (2) is sleeved with an elastic member (23), one end of the elastic member (23) abuts against the top wall of the bottom end of the slider of the inverted T-shaped structure, and the other end of the elastic member (23) abuts against the side wall of the end of the blocking piece (22).

5. The stop valve capable of reducing total resistance according to claim 4, characterized in that: The elastic member (23) is a spring or an elastic gasket.

6. The stop valve capable of reducing total resistance according to claim 1, characterized in that: The opening of one end of the communication hole located at the low-position inlet cavity (14) is a spherical structure, the upper end surface of the valve plug (21) is a spherical structure, and the valve plug (21) abuts against the side wall of the communication hole opening to form surface contact.

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