Anti-scouring stop valve

Abstract

The utility model discloses an anti-scouring stop valve which comprises a valve body and a valve rod, a valve clack is arranged at the lower end of the valve rod, a valve seat is arranged in the valve body, a first sealing portion and a second sealing portion are arranged on the sealing face of the valve clack and the sealing face of the valve seat respectively, a speed reduction portion is arranged at the bottom end of the valve clack, and the speed reduction portion is of a stepped conical structure. According to the utility model, the speed reducing part with the step-shaped conical structure is arranged at the lower end of the valve clack, so that a high-pressure-difference high-speed flow medium is diffused around along the step-shaped conical structure to disperse medium flow, and the structure can generate a backflow vortex at each step base angle to reduce the kinetic energy of the medium and reduce the flow speed of the medium; therefore, scouring of the medium to the valve clack is weakened, and the service life of the stop valve is prolonged.

Description

Technical Field

[0001] The utility model relates to a stop valve, in particular to an anti-scouring stop valve. Background Art

[0002] Currently available scour-resistant globe valves in China use two methods: one uses carbide welded to the sealing components, specifically the disc and seat sealing surfaces, to achieve scour resistance. Another method involves adding an anti-scour sleeve to the carbide sealing components. These structures do not prevent the disc and seat sealing surfaces from being scoured by high-pressure, high-velocity flow during the opening and closing phases. This can lead to scour failure of the disc and seat sealing surfaces, internal leakage, and a shortened product lifespan. Utility Model Content

[0003] In view of the deficiencies in the existing technology, the utility model provides an anti-scour stop valve.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: an anti-scour stop valve, including a valve body and a valve stem, a valve disc is provided at the lower end of the valve stem, a valve seat is provided in the valve body, the sealing surfaces of the valve disc and the valve seat are respectively provided with a first sealing part and a second sealing part, the bottom end of the valve disc is provided with a deceleration part, and the deceleration part is provided with a stepped conical structure.

[0005] A first annular boss is provided around the bottom surface of the speed reducing portion, and the height of the first annular boss is greater than that of the first sealing portion.

[0006] The outer wall of the valve disc is sleeved with a protective sleeve, and the height of the lower end of the protective sleeve is greater than the first sealing part.

[0007] The valve seat is provided with a second annular boss at the medium inlet, and the height of the second annular boss is greater than that of the second sealing portion.

[0008] A packing portion is provided between the valve stem and the valve body, a packing pressing portion is provided at the upper end of the packing portion, a pressure ring is provided at the lower end of the packing portion, the lower end of the pressure ring abuts against the guide sleeve, the lower edge of the guide sleeve abuts against the valve seat, and a through hole is provided on the side wall of the guide sleeve that is connected to the medium outlet of the valve body, and the lowest position of the through hole is higher than the second sealing portion.

[0009] A spherical protrusion is provided at the lower end of the speed reduction portion.

[0010] The protective cover and the valve flap are detachably connected.

[0011] A threaded portion is provided at the upper end of the valve disc, and a step is provided at the upper end of the protective sleeve. The threaded portion is connected to a nut, and the nut fixes the protective sleeve and the valve disc by pressing the step.

[0012] The deceleration portion and the valve disc are detachably connected.

[0013] The lower end of the protective sleeve is built-up with hard alloy.

[0014] The beneficial effects of the present invention are as follows: the present invention provides a deceleration portion with a stepped conical structure at the lower end of the valve disc, so that the high-pressure difference and high-speed flow medium diffuses to the surroundings along the stepped conical structure to disperse the medium flow. The structure can generate vortexes at the bottom corners of each stepped step to reduce the kinetic energy of the medium and reduce the flow rate of the medium, thereby reducing the scouring of the valve disc by the medium and improving the service life of the stop valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the utility model;

[0016] Figure 2 This is a partial enlarged view of the shut-off valve of the present invention in the open state;

[0017] Figure 3 It is a partial enlarged view of the shut-off valve of the present invention in the closed state. DETAILED DESCRIPTION

[0018] like Figure 1-Figure 3 As shown, an anti-scour stop valve comprises a valve body 1 and a valve stem 2. A valve disc 3 is provided at the lower end of the valve stem 2. A valve seat 4 is provided within the valve body 1. The sealing surfaces of the valve disc 3 and valve seat 4 are respectively provided with a first sealing portion 301 and a second sealing portion 402. In this embodiment, the first sealing portion 301 and the second sealing portion 402 are welded hard alloy. Conventional sealing structures in the prior art may also be used. The valve seat or valve body has a gasket groove on the contact surface, and a sealing gasket 12 is provided in the gasket groove. A deceleration portion 5 is provided at the bottom end of the valve disc 3. The deceleration portion 5 has a stepped conical structure. Specifically, the stepped conical structure is composed of multiple stepped shafts with larger upper sections and smaller lower sections. The stepped conical structure guides high-pressure differential and high-speed flow media to diffuse along the stepped conical structure to disperse the media flow. This structure also generates vortexes 13 at the bottom corners of each stepped step to reduce the media's kinetic energy and flow rate, thereby reducing the media's scour on the valve disc 3 and extending the service life of the stop valve. A spherical protrusion 502 is provided at the lower end of the deceleration portion 5. The spherical protrusion 502 can guide the medium to flow out more smoothly and reduce scouring of the area.

[0019] A first annular boss 501 is provided around the bottom surface of the deceleration portion 5. The height of the first annular boss 501 is greater than that of the first sealing portion 301. The first annular boss 501 guides the medium and further reduces the impact on the first sealing portion 301 of the valve disc 3. Preferably, the end surface of the first annular boss 501 is provided with an arc chamfer.

[0020] The outer wall of the valve disc 3 is sleeved with a protective sleeve 6, the lower end of which is higher than the first sealing portion 301. By providing the protective sleeve 6, the first sealing portion 301 is recessed between the deceleration portion 5 and the protective sleeve 6. When a high-pressure differential and high-speed flow medium flows through, the first annular boss 501 and the protective sleeve 6 effectively prevent the first sealing portion 301 on the valve disc 3 from being eroded, further improving the protection of the first sealing portion 301.

[0021] The valve seat 4 is provided with a second annular projection 401 at the medium inlet. The second annular projection 401 is taller than the second sealing portion 402. Preferably, the end surface of the first annular projection 501 is chamfered. The second annular projection 401 functions similarly to the first annular projection 501, guiding the medium and reducing impact on the second sealing portion 402 of the valve seat 4.

[0022] A packing portion 7 is provided between the valve stem 2 and the valve body 1. A packing pressing portion 8 is provided at the upper end of the packing portion 7. A pressure ring 9 is provided at the lower end of the packing portion 7. The lower end of the pressure ring 9 abuts against a guide sleeve 10. The lower edge of the guide sleeve 10 abuts against the valve seat 4. A through hole 1001 is provided on the sidewall of the guide sleeve 10, communicating with the medium outlet of the valve body 1. The lowest position of the through hole 1001 is higher than the second sealing portion 402. The provision of the guide sleeve 10 allows the second sealing portion 402 to be recessed within the second annular boss 401, further enhancing protection for the second sealing portion 402.

[0023] The protective sleeve 6 and the valve disc 3 are detachably connected. When the protective sleeve 6 is washed out, it can be repaired by replacing the protective sleeve 6, thereby reducing maintenance costs. In this embodiment, a threaded portion is provided on the upper end of the valve disc 3, and a step 601 is provided on the upper end of the protective sleeve 6. The threaded portion is connected to a nut 11, and the nut 11 fixes the protective sleeve 6 and the valve disc 3 by pressing the step 601. Furthermore, in order to prevent the nut 11 from loosening, the nut 11 and the valve disc 3 can be spot welded. The spot welding position is referenced to FIG. Figure 2 The middle spot weld 14. The lower end of the protective sleeve 6 is surfacing with hard alloy. Since the protective sleeve 6 is located at the outlet of the medium and is subject to relatively large scouring, a whole circle of hard alloy is surfacing at the lower end of the protective sleeve 6 to prevent scouring.

[0024] The deceleration portion 5 and the valve disc 3 are detachably connected. In this embodiment, threaded holes are respectively provided on the outer wall of the valve disc 3 and the deceleration portion 5 , and the deceleration sleeve and the valve disc 3 are fixedly connected by a set screw 15 .

[0025] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Without departing from the spirit and scope of the present invention, simple modifications and substitutions by those skilled in the art are within the scope of protection of the present invention.

Claims

1. An anti-scour stop valve, comprising a valve body and a valve stem, wherein a valve disc is provided at the lower end of the valve stem, a valve seat is provided in the valve body, and the sealing surfaces of the valve disc and the valve seat are respectively provided with a first sealing portion and a second sealing portion, characterized in that: A deceleration portion is provided at the bottom end of the valve disc, and the deceleration portion is provided with a stepped conical structure.

2. The anti-scour stop valve according to claim 1, characterized in that: A first annular boss is provided around the bottom surface of the speed reducing portion, and the height of the first annular boss is greater than that of the first sealing portion.

3. The anti-scour stop valve according to claim 2, characterized in that: The outer wall of the valve disc is sleeved with a protective sleeve, and the height of the lower end of the protective sleeve is greater than the first sealing part.

4. The anti-scour stop valve according to claim 1, characterized in that: The valve seat is provided with a second annular boss at the medium inlet, and the height of the second annular boss is greater than that of the second sealing portion.

5. The anti-scour stop valve according to claim 4, characterized in that: A packing portion is provided between the valve stem and the valve body, a packing pressing portion is provided at the upper end of the packing portion, a pressure ring is provided at the lower end of the packing portion, the lower end of the pressure ring abuts against the guide sleeve, the lower edge of the guide sleeve abuts against the valve seat, and a through hole is provided on the side wall of the guide sleeve that is connected to the medium outlet of the valve body, and the lowest position of the through hole is higher than the second sealing portion.

6. The anti-scour stop valve according to claim 1, characterized in that: A spherical protrusion is provided at the lower end of the speed reduction portion.

7. The anti-scour stop valve according to claim 3, characterized in that: The protective cover and the valve flap are detachably connected.

8. The anti-scour stop valve according to claim 7, characterized in that: A threaded portion is provided at the upper end of the valve disc, and a step is provided at the upper end of the protective sleeve. The threaded portion is connected to a nut, and the nut fixes the protective sleeve and the valve disc by pressing the step.

9. The anti-scour stop valve according to claim 1, characterized in that: The deceleration portion and the valve disc are detachably connected.

10. The anti-scour stop valve according to claim 3, characterized in that: The lower end of the protective sleeve is built-up with hard alloy.

Images