Stop valve

Abstract

The utility model provides a stop valve, and belongs to the technical field of valves. Comprising a valve body with a water inlet and a water outlet, a valve rod is arranged in the valve body in a penetrating mode, a valve seat enabling the water inlet to be communicated with the water outlet is arranged in the valve body, a plunger connected with the valve rod is arranged in the valve body, and a sealing gasket capable of being tightly attached to the upper end face of the valve seat is arranged on the plunger. The plunger is provided with an annular boss in the circumferential direction in a protruding mode, the lower end of the boss is provided with an annular limiting groove, the sealing gasket is embedded into the limiting groove, the plunger is provided with at least one buffering gasket, the buffering gasket is located below the sealing gasket, and a gap is formed between the buffering gasket and the inner wall of the valve seat. Through a dual protection mechanism, namely the synergistic effect of the buffer pad and the boss, the positioning reliability of the sealing pad is guaranteed, the sealing pad can bear water flow impact and keep normal work in the process of opening and closing the stop valve, and the sealing performance of the stop valve is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves and relates to a stop valve. Background Art

[0002] The stop valve is a commonly used valve. It is widely used in various fields to cut off the flow of fluids due to its simple structure, good sealing, high temperature resistance and high pressure resistance. The operating principle of the stop valve is to control the flow of fluid by raising or lowering the plunger used to cut off or open the water flow path. When the plunger is fully raised, the fluid can flow through the valve body without hindrance; when the plunger is fully lowered, a seal is formed between the valve core and the valve body to prevent the flow of fluid.

[0003] In the prior art, a valve seat is usually provided in the valve body to connect the water inlet and the water outlet of the valve body, and a sealing gasket is provided on the plunger to cut off the water flow channel through the sealing between the sealing gasket and the valve seat. In actual use, this valve has no positioning protection measures for the sealing gasket. During the opening and closing process of the stop valve, the sealing gasket of this type of valve receives the greatest impact force of the water flow at the moment the stop valve is opened or closed, so that the sealing gasket of the stop valve is offset at an angle or even overturned under the impact of the water flow and the cross flow during the opening and closing process of the stop valve, thereby reducing the sealing performance or even losing the sealing function, resulting in water leakage. Utility Model Content

[0004] The purpose of the utility model is to solve the above problems in the prior art and propose a stop valve. The technical problem to be solved by the utility model is: how to ensure the sealing performance of the stop valve.

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

[0006] A stop valve comprises a valve body with a water inlet and a water outlet, a valve stem passing through the valve body, a valve seat communicating with the water inlet and the water outlet, a plunger connected to the valve stem provided in the valve body, a sealing gasket which can be tightly attached to the upper end surface of the valve seat is provided on the plunger, and is characterized in that the plunger has an annular boss protruding along the circumferential direction, the lower end of the boss has an annular limiting groove, the sealing gasket is embedded in the limiting groove, and at least one buffer pad is provided on the plunger, the buffer pad is located below the sealing gasket and has a gap with the inner wall of the valve seat.

[0007] When the stop valve is opened, the plunger drives the sealing gasket and the buffer pad to move upward, and the water flow contacts the buffer pad first. At this time, the buffer pad is subjected to the maximum instantaneous water flow pressure. After the water flows through the buffer pad, it flows into the space between the buffer pad and the sealing ring from the gap. At this time, the water flow is decelerated by the buffering gasket and its flow rate is much slower than the instantaneous speed when the stop valve is opened. At this time, the water flow impact on the sealing gasket will be greatly reduced. When the water flows toward the water outlet, it will generate lateral pressure on the sealing gasket. The sealing gasket is embedded in the limit groove, so that the sealing gasket can obtain circumferential protection and vertical support from the boss. At this time, the sealing gasket is circumferentially protected by the boss, so that the cross-flow pressure acts on the boss, thereby avoiding direct cross-flow impact on the sealing gasket, ensuring the reliability of the sealing gasket positioning during the opening of the stop valve, and preventing the sealing gasket from being overturned by the water flow. After the stop valve is opened, the flow state of water in the valve body is relatively balanced. When the stop valve is closed, the plunger drives the sealing gasket and the buffer gasket to move downward until the sealing gasket and the upper end surface of the valve seat are sealed. Since the buffer gasket is located below the sealing gasket, the buffer gasket first needs to overcome the resistance of the water flow during the downward movement. The pressure of the water flow on the buffer gasket is the greatest. The water flow mitigated by the buffer gasket flows from the gap to the space between the buffer gasket and the sealing gasket. Therefore, the impact of the water flow on the sealing gasket is weakened. In addition, the downward supporting force of the boss on the sealing gasket enables the sealing gasket to counteract the received water flow impact. At the same time, the boss also has lateral protection for the sealing gasket, which ensures the reliability of the sealing gasket positioning during the closing of the stop valve. The sealing gasket is doubly protected by the boss and the buffer gasket to avoid the displacement of the sealing gasket position and angle, thereby ensuring the sealing of the stop valve.

[0008] In the above-mentioned stop valve, the lower end of the plunger is provided with an annular positioning groove along the circumference, and the buffer pad is annular, and is sleeved on the lower end of the plunger and inserted into the positioning groove. The annular shape of the buffer pad matches the shape of the positioning groove, so that the buffer pad can be inserted into the positioning groove for positioning. Since the buffer pad is sleeved on the lower end of the plunger, the edge of the buffer pad will be impacted by the water flow and deform upward to a certain extent. This deformation makes the buffer pad and the water flow impact have a softer confrontation, reducing the water flow turbulence caused by the sudden obstruction of the water flow, so that the water flow flows more smoothly to the water outlet.

[0009] In the above-mentioned stop valve, the plunger also has a limiting portion protruding outwardly in the circumferential direction, and the upper end of the limiting portion is in contact with the lower end surface of the sealing gasket. The limiting portion is arranged so that the sealing gasket can be stuck in the limiting groove, providing additional support and stability, and preventing the sealing gasket from being displaced or tilted during the closing process.

[0010] In the above-mentioned stop valve, a convex edge extends inwardly from the boss along the edge of the notch of the limiting groove, and the upper end of the convex edge fits the lower end of the sealing gasket. The setting of the convex edge enables the sealing gasket to be more firmly positioned in the limiting groove, reduces the shaking of the sealing gasket, and further ensures the sealing performance of the stop valve.

[0011] In the above-mentioned stop valve, the inner diameter of the convex edge is larger than the outer diameter of the upper end of the valve seat. The inner diameter of the convex edge is larger than the outer diameter of the upper end of the valve seat so that the convex edge will not interfere with the upper end surface of the valve seat when the stop valve is closed, so that the sealing gasket can be more closely fitted and sealed with the upper end surface of the valve seat, further ensuring the sealing performance of the stop valve.

[0012] In the above-mentioned stop valve, the lower end of the plunger is spherical, and the lower end of the plunger smoothly transitions with the limiter. The spherical lower end of the plunger can more evenly divert the water flow, so that the impact of the water flow on the buffer pad is more uniform, reducing the impact on the buffer pad, and the smoothly transitioning limiter and the lower end of the plunger can reduce the turbulence of the water flow.

[0013] In the above-mentioned stop valve, the valve stem is threadedly connected to the upper end of the plunger, and a valve cap threadedly connected to the valve body is fixedly arranged outside the valve stem, and a handwheel is connected to the upper end of the valve stem. The upper end of the plunger is tightly fixed to the valve stem through the threaded connection to ensure the coordinated movement of the plunger and the valve stem, so that when the handwheel rotates, the valve stem can push the plunger to open and close the flow channel in the valve body. The valve cap is fixed to the valve body as an outer set and threadedly connected to the valve body to provide a safe connection method. The handwheel is connected to the upper end of the valve stem and is used to manually operate the stop valve. By rotating the handwheel, the valve stem moves with the plunger to control the on and off of the fluid, providing a convenient operating handle so that the user can easily open or close the stop valve and adjust the flow of the fluid.

[0014] Compared with the prior art, the advantages of the utility model are:

[0015] 1. Through the double protection mechanism, that is, the synergistic effect of the buffer pad and the boss, the positioning reliability of the sealing gasket is guaranteed. In the process of opening and closing the stop valve, the sealing gasket can withstand the impact of water flow and maintain normal operation, thereby improving the sealing performance of the stop valve.

[0016] 2. The limiting portion and the convex edge enable the sealing gasket to be more firmly positioned in the limiting groove, further ensuring the sealing between the sealing gasket and the valve seat.

[0017] 3. The edge of the buffer pad will be impacted by the water flow and deform upward to a certain extent. This deformation makes the buffer pad and the water flow impact have a softer confrontation, reduces the water flow turbulence caused by the sudden obstruction of the water flow, and allows the water flow to flow more smoothly to the outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the stop valve.

[0019] Figure 2 It is a structural cross-sectional view of the stop valve in the closed state.

[0020] Figure 3 It is a structural cross-sectional view of the stop valve in the open state.

[0021] In the figure, 1, valve body; 11, water inlet; 12, water outlet; 13, valve seat; 2, plunger; 21, boss; 211, limit groove; 212, convex edge; 22, limit part; 23, positioning groove; 3, sealing gasket; 4, buffer pad; 5, gap; 6, valve stem; 7, valve cap; 8, handwheel. DETAILED DESCRIPTION

[0022] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to the following embodiments.

[0023] Combination Figures 1 to 3 A stop valve comprises a valve body 1 having a water inlet 11 and a water outlet 12, a valve stem 6 is inserted in the valve body 1, a valve seat 13 is provided in the valve body 1 to communicate the water inlet 11 and the water outlet 12, a plunger 2 is provided in the valve body 1, the upper end of the plunger 2 is threaded with the valve stem 6, a valve cap 7 threadedly connected to the valve body 1 is fixedly disposed on the valve stem 6, a hand wheel 8 is connected to the upper end of the valve stem 6, and a sealing gasket 3 that can be tightly attached to the upper end surface is provided on the plunger 2. The upper end of the plunger 2 is tightly fixed to the valve stem 6 through the threaded connection to ensure the coordinated movement of the plunger 2 and the valve stem 6, so that when the hand wheel 8 rotates, the valve stem 6 can push the plunger 2 to open and close the flow channel in the valve body 1.

[0024] The plunger 2 has an annular boss 21 protruding circumferentially, and the lower end of the boss 21 has an annular limiting groove 211, and the sealing gasket 3 is embedded in the limiting groove 211. At least one buffer pad 4 is provided on the plunger 2, and the buffer pad 4 is located below the sealing gasket 3 and has a gap 5 with the inner wall of the valve seat 13. An annular positioning groove 23 is opened circumferentially at the lower end of the plunger 2. The buffer pad 4 is annular, and the buffer pad 4 is sleeved on the lower end of the plunger 2 and snapped into the positioning groove 23. The annular shape of the buffer pad 4 matches the shape of the positioning groove 23, so that the buffer pad 4 can be snapped into the positioning groove 23 for positioning. Since the buffer pad 4 is sleeved on the lower end of the plunger 2, the edge of the buffer pad 4 will be impacted by the water flow and deform upward to a certain extent. This deformation makes the buffer pad 4 have a softer confrontation with the water flow impact, reduces the water flow turbulence caused by the sudden obstruction of the water flow, and makes the water flow flow to the water outlet 12 more smoothly. The plunger 2 also has a limiting portion 22 protruding outward in the circumferential direction, and the boss 21 has a convex edge 212 extending inward along the edge of the groove of the limiting groove 211. The upper end of the limiting portion 22 fits with the lower end surface of the sealing gasket 3, and the upper end of the convex edge 212 fits with the lower end of the sealing gasket 3 so that the sealing gasket 3 can be more firmly positioned in the limiting groove 211, thereby reducing the shaking of the sealing gasket 3 and further ensuring the sealing of the stop valve. The inner diameter of the convex edge 212 is larger than the outer diameter of the upper end of the valve seat 13, so that the convex edge 212 will not interfere with the upper end surface of the valve seat 13 when the stop valve is closed, so that the sealing gasket 3 can fit and seal more tightly with the upper end surface of the valve seat 13, further ensuring the sealing performance of the stop valve. The spherical lower end of the plunger 2 can divert the water flow more evenly, so that the water flow impact on the buffer pad 4 is more uniform, reducing the impact on the buffer pad 4, and the smooth transition between the lower end of the plunger 2 and the limit portion 22 can reduce the turbulence of the water flow.

[0025] When the stop valve is opened, by rotating the handwheel 8, the plunger 2 drives the sealing gasket 3 and the buffer gasket 4 to move upward synchronously, and the water flow first contacts the buffer gasket 4. At this time, the buffer gasket 4 is subjected to the maximum instantaneous water flow pressure. After the water flow passes through the buffer gasket 4, it flows into the space between the buffer gasket 4 and the sealing ring from the gap 5. At this time, the water flow is decelerated by the buffering of the buffer gasket 4 and its flow rate is much slower than the instantaneous speed of opening the stop valve. At this time, the water flow impact on the sealing gasket 3 will be greatly reduced. When the water flow flows toward the water outlet 12, it will generate lateral pressure on the sealing gasket 3. The sealing gasket 3 is embedded in the limiting groove 211, so that the sealing gasket 3 can obtain the circumferential protection and vertical support of the boss 21. At this time, the sealing gasket 3 is circumferentially protected by the boss 21, so that the cross-flow pressure acts on the boss 21, thereby avoiding the direct cross-flow impact on the sealing gasket 3, ensuring the positioning reliability of the sealing gasket 3 during the opening of the stop valve, and preventing the sealing gasket 3 from being overturned by the water flow.

[0026] After the stop valve is opened, the flow state of water in the valve body 1 is relatively balanced. When the stop valve is closed, by rotating the handwheel 8, the plunger 2 drives the sealing gasket 3 and the buffer gasket 4 to move downward synchronously until the sealing gasket 3 is sealed with the upper end surface of the valve seat 13. Since the buffer gasket 4 is located below the sealing gasket 3, the buffer gasket 4 first needs to overcome the resistance of the water flow during the downward movement. The pressure of the water flow on the buffer gasket 4 is the greatest. The water flow mitigated by the buffer gasket 4 flows from the gap 5 to the space between the buffer gasket 4 and the sealing gasket 3. Therefore, the impact of the water flow on the sealing gasket 3 is weakened. In addition, the downward supporting force of the boss 21 on the sealing gasket 3 enables the sealing gasket 3 to counteract the received water flow impact. At the same time, the boss 21 also has lateral protection for the sealing gasket 3, which ensures the positioning reliability of the sealing gasket 3 during the closing of the stop valve. The sealing gasket 3 is doubly protected by the boss 21 and the buffer gasket 4 to avoid the displacement of the position and angle of the sealing gasket 3, thereby ensuring the sealing of the stop valve.

[0027] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0028] Although the terms such as water inlet 11, water outlet 12, valve body 1, valve seat 13, plunger 2, sealing pad 3, boss 21, limit groove 211, buffer pad 4, gap 5, limit portion 22, positioning groove 23, convex edge 212, valve stem 6, valve cap 7, hand wheel 8 are used more frequently in this article, the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A stop valve, comprising a valve body (1) having a water inlet (11) and a water outlet (12), a valve stem (6) passing through the valve body (1), a valve seat (13) communicating the water inlet (11) and the water outlet (12), a plunger (2) connected to the valve stem (6) being provided in the valve body (1), a sealing gasket (3) being provided on the plunger (2) and being able to be in close contact with the upper end surface of the valve seat (13), characterized in that: The plunger (2) has an annular boss (21) protruding in the circumferential direction, the lower end of the boss (21) has an annular limiting groove (211), the sealing gasket (3) is embedded in the limiting groove (211), and at least one buffer pad (4) is provided on the plunger (2), the buffer pad (4) is located below the sealing gasket (3) and has a gap (5) between it and the inner wall of the valve seat (13).

2. A stop valve according to claim 1, characterized in that: The lower end of the plunger (2) is provided with an annular positioning groove (23) along the circumferential direction. The buffer pad (4) is annular and is sleeved on the lower end of the plunger (2) and inserted into the positioning groove (23).

3. A stop valve according to claim 1 or 2, characterized in that: The plunger (2) is also provided with a limiting portion (22) protruding outwardly in the circumferential direction, and the upper end of the limiting portion (22) is in contact with the lower end surface of the sealing gasket (3).

4. A stop valve according to claim 3, characterized in that: A convex edge (212) extends inwardly from the boss (21) along the edge of the notch of the limiting groove (211), and the upper end of the convex edge (212) fits with the lower end of the sealing gasket (3).

5. A stop valve according to claim 4, characterized in that: The inner diameter of the convex edge (212) is greater than the outer diameter of the upper end of the valve seat (13).

6. A stop valve according to claim 4, characterized in that: The lower end of the plunger (2) is spherical, and the lower end of the plunger (2) transitions smoothly with the limiting portion (22).

7. A stop valve according to claim 6, characterized in that: The valve stem (6) is threadedly connected to the upper end of the plunger (2); a valve cap (7) threadedly connected to the valve body (1) is fixedly disposed outside the valve stem (6); and a hand wheel (8) is connected to the upper end of the valve stem (6).

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