Anti-scouring stop valve

Abstract

The anti-scouring stop valve comprises a valve body, a valve rod, a valve clack and a valve seat, an inlet channel, a middle cavity and an outlet channel which are connected are sequentially arranged in the valve body, a shaft hole communicated with the middle cavity is formed in the upper portion of the valve body, the valve rod penetrates through the shaft hole and extends into the middle cavity, and the valve clack is arranged at the inner end of the valve rod. The valve seat is mounted at the junction of the middle cavity and the outlet channel; the packing pressing plate, the packing pressing sleeve, the sealing packing, the packing pad and the sleeve are sequentially arranged on the periphery of the valve rod in a sleeving mode from top to bottom, the packing pressing plate is connected with the valve body through a bolt, the sealing packing and the packing pad are arranged in the shaft hole, the sleeve is arranged in the middle cavity, and the lower end of the sleeve abuts against the upper end of the valve seat. The outer periphery of the valve clack is attached to the inner periphery of the sleeve, and a plurality of passing openings are formed in the side portion of the sleeve in a penetrating mode. The anti-scouring capacity of the sealing surfaces of the valve clack and the valve seat is improved by reducing the flow speed of a medium reaching the sealing surfaces of the valve seat, so that the service life of the valve is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to an anti-scouring stop valve. Background Art

[0002] The stop valve, also known as the gate valve, is a forced sealing valve and one of the most widely used valves. It is popular because the friction between the sealing surfaces during opening and closing is small, it is relatively durable, the opening height is not large, it is easy to manufacture and maintain, and it is suitable not only for medium and low pressures, but also for high pressures.

[0003] For existing stop valves, at the moment the valve is opened or closed, due to the small gap between the sealing surfaces, the high flow rate of the medium, and the large pressure difference, the particles in the medium cause a large amount of scouring and cavitation on the sealing surface, which can easily cause the sealing pair to be loosely closed and cause leakage, causing a great impact on the piping system equipment. Utility Model Content

[0004] The utility model aims to provide an anti-scouring stop valve. The utility model improves the anti-scouring ability of the sealing surfaces of the valve disc and the valve seat by reducing the flow velocity of the medium when the medium reaches the valve seat sealing surface, thereby extending the service life of the valve.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an anti-scour stop valve, comprising a valve body, a valve stem, a valve disc and a valve seat, wherein the valve body is provided with an inlet channel, a middle cavity and an outlet channel connected in sequence, an axial hole connected to the middle cavity is provided on the upper part of the valve body, the valve stem passes through the axial hole and extends into the middle cavity, the valve disc is arranged at the inner end of the valve stem, and the valve seat is installed at the junction of the middle cavity and the outlet channel, and is used to form a sealing fit with the valve disc when the valve is closed; it also includes a packing pressure plate, a packing pressure sleeve, a sealing packing, a packing pad and a sleeve which are sequentially sleeved on the outer periphery of the valve stem from top to bottom, the packing pressure plate is connected to the valve body by bolts, the sealing packing and the packing pad are arranged in the axial hole, the sleeve is arranged in the middle cavity, and the lower end of the sleeve is tightly abutted against the upper end of the valve seat, the outer periphery of the valve disc is fitted with the inner periphery of the sleeve, and a plurality of through-ports are arranged on the side of the sleeve.

[0006] By adopting the above technical solution, a sleeve with multiple openings is arranged in the middle cavity to increase the resistance of the medium flowing through the sleeve, thereby reducing the flow rate of the medium when it reaches the valve seat sealing surface, thereby improving the anti-scouring ability of the sealing surfaces of the valve disc and the valve seat, thereby extending the service life of the valve.

[0007] The utility model is further configured that a plurality of pressure-stabilizing holes are provided through the side of the sleeve near the upper end.

[0008] By adopting the above technical solution and setting a pressure-stabilizing hole on the sleeve, the pressure balance inside and outside the sleeve can be maintained, so that the valve stem drives the valve disc to move more smoothly.

[0009] The utility model is further configured that the upper end of the sleeve is provided with a limiting flange extending toward the inner circumference for constituting an upper stroke limit for the valve disc.

[0010] By adopting the above technical solution, the valve stem can be limited in its upward stroke to ensure the accuracy of its opening and closing positions.

[0011] The utility model is further configured that a sealing groove is provided at the bottom of the valve seat, and a sealing ring is embedded in the sealing groove and is used for forming a sealing fit with the inner wall of the valve body.

[0012] By adopting the above technical solution, the sealing between the valve seat and the inner wall of the valve body can be ensured after the valve seat is installed, thereby preventing the medium from leaking from the gap between the two.

[0013] The utility model is further configured such that an installation groove extending to the bottom end is also provided on the inner side of the sleeve, a pressure reducing cylinder is embedded in the installation groove, the position of the sleeve corresponding to the upper end of the installation groove presses the pressure reducing cylinder onto the valve seat, an annular recess is provided on the outer side of the pressure reducing cylinder, an annular chamber is formed between the annular recess and the sleeve, and a plurality of pressure reducing holes distributed in a circular array are provided through the position of the pressure reducing cylinder corresponding to the annular recess.

[0014] By adopting the above technical solution, a two-stage pressure relief structure is provided to enhance the pressure relief effect, improve the turbulent state of the medium, and further enhance the anti-scouring capability of the sealing surfaces of the valve disc and the valve seat.

[0015] The utility model is further configured as follows: the valve flap is an open upper end and hollow structure, a limiting ring is provided at the opening at the upper end of the valve flap, so that a flow chamber is formed inside the valve flap, the valve stem passes through the limiting ring and extends into the flow chamber, the end of the valve stem corresponding to the flow chamber is provided with a sealing portion with an outer diameter larger than the valve stem, and the outer diameter of the sealing portion is smaller than the inner diameter of the flow chamber, a plurality of first pressure reducing channels for connecting the pressure reducing hole with the flow chamber are provided on the side of the valve flap, and a plurality of second pressure reducing channels for connecting the outside of the valve flap with the flow chamber are provided on the bottom of the valve flap.

[0016] By adopting the above technical solution, pressure can be released at the moment the valve is opened, thereby reducing the valve opening resistance and significantly reducing the noise generated by the impact of the medium.

[0017] The utility model is further configured such that the lower end surface of the sealing portion is in a dome shape.

[0018] By adopting the above technical solution, when the valve is closed, the sealing portion can better cooperate with the second pressure-reducing channel on the valve disc.

[0019] The utility model is further configured that the limit ring is threadedly connected to the upper part of the valve disc.

[0020] By adopting the above technical solution, the installation structure is simple and reliable, and the assembly and disassembly is very convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of Example 1;

[0022] Figure 2 for Figure 1 The enlarged structural diagram of the middle A part;

[0023] Figure 3 It is a schematic diagram of the overall structure of Example 2;

[0024] Figure 4 for Figure 2 Schematic diagram of the enlarged structure of part B in the middle.

[0025] In the figure: 1. valve body; 2. valve stem; 3. valve disc; 4. valve seat; 5. inlet channel; 6. middle cavity; 7. outlet channel; 8. axial hole; 9. packing pressure plate; 10. packing pressure sleeve; 11. sealing packing; 12. packing pad; 13. sleeve; 14. through-port; 15. pressure-stabilizing hole; 16. limiting flange; 17. sealing groove; 18. sealing ring; 19. mounting groove; 20. pressure-reducing cylinder; 21. annular recess; 22. annular chamber; 23. pressure-reducing hole; 24. limiting ring; 25. flow cavity; 26. sealing part; 27. first pressure-reducing channel; 28. second pressure-reducing channel. DETAILED DESCRIPTION

[0026] 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.

[0027] Embodiment 1: As attached Figure 1 and attached Figure 2The anti-scour stop valve shown in the figure comprises a valve body 1, a valve stem 2, a valve disc 3 and a valve seat 4, wherein the valve body 1 is provided with an inlet channel 5, a middle cavity 6 and an outlet channel 7 connected in sequence, the upper part of the valve body 1 is provided with an axial hole 8 connected to the middle cavity 6, the valve stem 2 passes through the axial hole 8 and extends into the middle cavity 6, the valve disc 3 is arranged at the inner end of the valve stem 2, and the valve seat 4 is installed at the junction of the middle cavity 6 and the outlet channel 7, and is used to form a sealing match with the valve disc 3 when the valve is closed; and further comprises The packing plate 9, packing sleeve 10, sealing packing 11, packing pad 12 and sleeve 13 are sequentially sleeved on the outer periphery of the valve stem 2 from top to bottom. The packing plate 9 is connected to the valve body 1 by bolts. The sealing packing 11 and packing pad 12 are arranged in the shaft hole 8. The sleeve 13 is arranged in the middle cavity 6, and the lower end of the sleeve 13 is tightly abutted against the upper end of the valve seat 4. The outer periphery of the valve disc 3 fits the inner periphery of the sleeve 13, and the side of the sleeve 13 is penetrated with multiple through-holes 14. By arranging the sleeve 13 with multiple through-holes 14 in the middle cavity 6, the resistance of the medium flowing through the sleeve 13 is increased, thereby reducing the flow rate of the medium when it reaches the sealing surface of the valve seat 4, so as to improve the anti-scouring ability of the sealing surfaces of the valve disc 3 and the valve seat 4, thereby extending the service life of the valve.

[0028] As attached Figure 2 As shown, a plurality of pressure stabilizing holes 15 are provided on the side of the sleeve 13 near the upper end. The pressure stabilizing holes 15 are provided on the sleeve 13 to maintain the pressure balance inside and outside the sleeve 13, so that the valve stem 2 drives the valve disc 3 to move more smoothly.

[0029] As attached Figure 2 As shown, the upper end of the sleeve 13 is provided with a limit flange 16 extending inwardly to limit the upper stroke of the valve disc 3, and the limit flange 16 and the sleeve 13 are an integrated structure. This design can limit the upper stroke of the valve stem 2 and ensure the accuracy of its opening and closing position.

[0030] As attached Figure 2 As shown, a sealing groove 17 is provided at the bottom of the valve seat 4, and a sealing ring 18 is embedded in the sealing groove 17 for forming a sealing match with the inner wall of the valve body 1. This design can ensure the sealing between the valve seat 4 and the inner wall of the valve body 1 after the valve seat 4 is installed, and prevent the medium from leaking from the gap between the two.

[0031] Embodiment 2 is different from embodiment 1. Figure 3 and attached Figure 4As shown, in this embodiment, the inner side of the sleeve 13 is also provided with a mounting groove 19 extending to the bottom end, and a pressure reducing cylinder 20 is embedded in the mounting groove 19. The shape of the mounting groove 19 matches the shape of the pressure reducing cylinder 20. The sleeve 13 presses the pressure reducing cylinder 20 against the valve seat 4 at the position corresponding to the upper end of the mounting groove 19. An annular recess 21 is provided on the outer side of the pressure reducing cylinder 20. An annular chamber 22 is formed between the annular recess 21 and the sleeve 13. The position of the pressure reducing cylinder 20 corresponding to the annular recess 21 is provided with a plurality of pressure reducing holes 23 distributed in a circumferential array. A two-stage pressure reducing structure is provided to improve the pressure reducing effect, improve the turbulent state of the medium, and further improve the anti-scouring ability of the sealing surfaces of the valve disc 3 and the valve seat 4.

[0032] Furthermore, as attached Figure 4 As shown, the valve flap 3 is an open and hollow structure at the upper end, and a stop ring 24 is provided at the upper end opening of the valve flap 3, so that a flow chamber 25 is formed inside the valve flap 3, and the valve stem 2 passes through the stop ring 24 and extends into the flow chamber 25. The valve stem 2 is provided with a sealing portion 26 with an outer diameter greater than that of the valve stem 2 at one end corresponding to the flow chamber 25, and the outer diameter of the sealing portion 26 is smaller than the inner diameter of the flow chamber 25, and the height of the flow chamber 25 is greater than the height of the sealing portion 26, so that the sealing portion 26 can be axially displaced in the sealing chamber, and the side of the valve flap 3 is provided with a plurality of first pressure relief channels 27 (the first pressure relief channel 27 is composed of an external annular channel and a plurality of through holes arranged inside, and the plurality of through holes are connected to the annular channel) for connecting the pressure relief hole 23 with the flow chamber 25, and the bottom of the valve flap 3 is provided with a plurality of second pressure relief channels 28 for connecting the outside of the valve flap 3 with the flow chamber 25. Pressure relief can be performed at the moment of valve opening, thereby reducing the valve opening resistance and significantly reducing the noise generated by the impact of the medium.

[0033] As attached Figure 4 As shown, the lower end surface of the sealing portion 26 is in a dome shape, so that when the valve is closed, the sealing portion 26 can better cooperate with the second pressure relief channel 28 on the valve flap 3.

[0034] As attached Figure 4 As shown, the stop ring 24 is threadedly connected to the upper part of the valve disc 3, that is, the upper part of the valve disc 3 has an internal thread, and the outer periphery of the stop ring 24 has an external thread matching the internal thread. The installation structure is simple and reliable, and the disassembly and assembly are very convenient.

Claims

1. An anti-scour stop valve, comprising a valve body (1), a valve stem (2), a valve flap (3) and a valve seat (4), wherein the valve body (1) is provided with an inlet channel (5), a middle cavity (6) and an outlet channel (7) connected in sequence, an axial hole (8) connected to the middle cavity (6) is provided on the upper part of the valve body (1), the valve stem (2) passes through the axial hole (8) and extends into the middle cavity (6), the valve flap (3) is arranged at the inner end of the valve stem (2), and the valve seat (4) is installed at the junction of the middle cavity (6) and the outlet channel (7) to form a sealing fit with the valve flap (3) when the valve is closed; Features: It also includes a packing pressure plate (9), a packing pressure sleeve (10), a sealing packing (11), a packing pad (12) and a sleeve (13) which are sequentially sleeved on the outer periphery of the valve stem (2) from top to bottom, the packing pressure plate (9) is connected to the valve body (1) by bolts, the sealing packing (11) and the packing pad (12) are arranged in the shaft hole (8), the sleeve (13) is arranged in the middle cavity (6), and the lower end of the sleeve (13) is tightly abutted against the upper end of the valve seat (4), the outer periphery of the valve disc (3) is in contact with the inner periphery of the sleeve (13), and a plurality of through-holes (14) are arranged on the side of the sleeve (13).

2. The anti-scour stop valve according to claim 1, Features: A plurality of pressure-stabilizing holes (15) are provided through the side of the sleeve (13) near the upper end.

3. The anti-scour stop valve according to claim 1, Features: The upper end of the sleeve (13) is provided with a limiting flange (16) extending toward the inner circumference and used for limiting the upper stroke of the valve flap (3).

4. The anti-scour stop valve according to claim 1, Features: A sealing groove (17) is provided at the bottom of the valve seat (4), and a sealing ring (18) is embedded in the sealing groove (17) for forming a sealing fit with the inner wall of the valve body (1).

5. The anti-scour stop valve according to claim 1, Features: The inner side of the sleeve (13) is also provided with a mounting groove (19) extending to the bottom end, a pressure reducing cylinder (20) is embedded in the mounting groove (19), the sleeve (13) presses the pressure reducing cylinder (20) onto the valve seat (4) at a position corresponding to the upper end of the mounting groove (19), an annular recess (21) is provided on the outer side of the pressure reducing cylinder (20), an annular chamber (22) is formed between the annular recess (21) and the sleeve (13), and a plurality of pressure reducing holes (23) distributed in a circumferential array are provided through the pressure reducing cylinder (20) at a position corresponding to the annular recess (21).

6. The anti-scour stop valve according to claim 5, Features: The valve flap (3) is of a hollow structure with an upper end open. A limiting ring (24) is provided at the upper end opening of the valve flap (3), so that a flow chamber (25) is formed inside the valve flap (3). The valve stem (2) passes through the limiting ring (24) and extends into the flow chamber (25). One end of the valve stem (2) corresponding to the flow chamber (25) is provided with a sealing portion (26) whose outer diameter is larger than that of the valve stem (2), and the outer diameter of the sealing portion (26) is smaller than the inner diameter of the flow chamber (25). A plurality of first pressure reducing channels (27) for connecting the pressure reducing hole (23) with the flow chamber (25) are provided on the side of the valve flap (3), and a plurality of second pressure reducing channels (28) for connecting the outside of the valve flap (3) with the flow chamber (25) are provided at the bottom of the valve flap (3).

7. The anti-scour stop valve according to claim 6, Features: The lower end surface of the sealing portion (26) is in a dome shape.

8. The anti-scour stop valve according to claim 7, Features: The limiting ring (24) is threadedly connected to the upper part of the valve flap (3).

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