Pressure reduction stop valve

Abstract

The invention discloses a pressure reduction stop valve, and relates to the technical field of valves, the pressure reduction stop valve comprises a valve body, a valve seat, a valve clack and a lifting mechanism, the valve body is provided with a cavity, and the middle of the cavity is provided with a vertically arranged opening and closing port; the valve seat is arranged around the opening and closing through opening. The valve clack is located above the valve seat and connected with the valve seat in a sealed mode, a water retaining ring is arranged at the bottom of the valve clack in a protruding mode, and the water retaining ring is made of rubber. The lifting mechanism comprises a valve rod, the valve rod is connected with the valve clack, the valve rod is used for driving the valve clack to ascend or descend so that the opening and closing port can be opened or closed, and the water retaining ring is used for stopping sprayed media. The invention aims to reduce operation noise and prolong the service life of the valve.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valves, in particular to a pressure-reducing stop valve. BACKGROUND

[0002] As a forced sealing valve, the basic structure of the stop valve usually includes a valve body, a valve seat, a valve disc, a valve cover, a valve stem and a handwheel. In actual operation, the user drives the valve stem to move by rotating the handwheel, which drives the valve disc to move up and down, so as to realize the separation or sealing contact with the valve seat, and complete the opening and closing function of the valve. However, the stop valve in the prior art has a significant technical defect in the running process: when the gap between the valve disc and the valve seat changes during opening and closing, a high-speed jet flow will be formed due to the constant medium pressure. This jet phenomenon not only produces a huge operating noise, but more importantly, it causes a persistent impact on the key components such as the valve stem sealing part and the inner wall of the valve body. Especially in the application scenarios where the valve needs to be frequently opened and closed, this long-term high-pressure impact will cause damage to the valve body structure and rapid aging of the sealing element, seriously affecting the service life and sealing performance of the valve. SUMMARY

[0003] The main purpose of the present application is to provide a pressure-reducing stop valve, which aims to reduce the operating noise and prolong the service life of the valve.

[0004] To achieve the above-mentioned purpose, the pressure-reducing stop valve provided by the present application comprises: a valve body, the valve body is provided with a cavity, and a vertical opening and closing opening is arranged in the middle of the cavity; a valve seat, the valve seat is arranged around the opening and closing opening; a valve disc, the valve disc is located above the valve seat and is in sealing connection with the valve seat, and a water blocking ring is protrudingly arranged at the bottom of the valve disc, and the water blocking ring is made of rubber; a lifting mechanism, the lifting mechanism comprises a valve stem, the valve stem is connected with the valve disc, and the valve stem is used to drive the valve disc to rise or fall, so as to open or close the opening and closing opening, and the water blocking ring is used to stop the jet medium.

[0005] In an embodiment, the water blocking ring is detachably connected with the valve disc.

[0006] In an embodiment, a ring-shaped groove is concavely arranged at the bottom of the valve disc, the inner wall of the ring-shaped groove is provided with threads, the water blocking ring comprises a threaded ring and a stop ring, the threaded ring is threadedly connected with the ring-shaped groove, and the stop ring is arranged below the threaded ring.

[0007] In an embodiment, the cross-sectional diameter of the stop ring gradually increases from top to bottom.

[0008] In an embodiment, the stop ring is a flat-topped pyramid structure.

[0009] In an embodiment, the inner wall surface of the stop ring is an arc-shaped concave structure.

[0010] In an embodiment, the top of the valve seat is provided with a clearance slot, the stop ring is arranged in the clearance slot when the valve disc is in the closed state, the stop ring is provided with a plurality of through holes, and a small amount of medium is allowed to flow out through the through holes when the stop ring is not completely separated from the clearance slot, so as to realize early diversion.

[0011] In an embodiment, the bottom of the valve disc and the top of the valve seat are both provided with elastic sealing members.

[0012] In an embodiment, the bottom surface of the sealing member of the bottom of the valve disc is provided with an inverted inclined surface, and the top surface of the sealing member of the top of the valve seat is provided with an inner guide inclined surface, and the two guide inclined surfaces are arranged in abutting sealing manner.

[0013] In an embodiment, the outer side of the valve body is provided with a structure reinforcing rib.

[0014] As can be seen from the above, the pressure reducing stop valve provided by the application effectively blocks the high-speed sprayed medium during the opening and closing of the valve disc, reduces the impact on the inner wall of the valve body and the sealing member, significantly reduces the operating noise, prolongs the service life of the valve and improves the sealing performance. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor based on the drawings shown.

[0016] Figure 1 The figure shows a three-dimensional structure of an embodiment of the pressure reducing stop valve provided by the application. Figure 2 The figure shows a cross-sectional view. Figure 3 The figure shows an exploded view.

[0017] Explanation of reference numerals: 1000, pressure reducing stop valve; 1, valve body; 2, valve seat; 21, clearance slot; 3, valve disc; 31, water blocking ring; 311, threaded ring; 312, stop ring; 32, annular groove; 4, valve stem; 5, elastic sealing member; 6, reinforcing rib.

[0018] The objectives, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the protection scope of the present application.

[0020] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture (as shown in the drawings). If the certain posture changes, the directional indications also change accordingly.

[0021] In addition, if the embodiments of the present application involve descriptions of “first”, “second”, etc., the descriptions of “first”, “second”, etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by “first” and “second” can explicitly or implicitly include at least one of the features. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the fact that a person of ordinary skill in the art can realize the combination. When the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist and is not within the protection scope of the present application.

[0022] Please refer to Figures 1 to 3 The present application provides a pressure reducing stop valve 1000, which comprises a valve body 1, a valve seat 2, a valve clack 3 and a lifting mechanism. The valve body 1 is provided with a chamber, and a vertical opening and closing opening is arranged in the middle of the chamber. The valve seat 2 is arranged around the opening and closing opening. The valve clack 3 is located above the valve seat 2 and is sealingly connected with the valve seat 2. A water blocking ring 31 is protrudingly arranged at the bottom of the valve clack 3, and the water blocking ring 31 is made of rubber. The lifting mechanism comprises a valve rod 4, the valve rod 4 is connected with the valve clack 3, and the valve rod 4 is used to drive the valve clack 3 to rise or fall, so as to open or close the opening and closing opening. The water blocking ring 31 is used to stop the sprayed medium.

[0023] Specifically, the valve body 1 can be made of cast iron, stainless steel or other pressure-resistant materials, and the chamber shape can be cylindrical or rectangular. The diameter of the opening and closing port can be designed to be 10-50mm according to the medium flow requirement. The valve seat 2 is usually made of metal material, and the surface can be plated with hard chromium to improve the wear resistance. The sealing connection mode of the valve disc 3 and the valve seat 2 includes plane sealing, conical sealing or spherical sealing. The valve stem 4 of the lifting mechanism can be driven by screw thread or hydraulic pressure, and the diameter of the valve stem 4 is usually 8-20mm.

[0024] The technical scheme sets the water blocking ring 31 structure, effectively solves the technical problem of medium injection caused by the stop valve in the opening and closing process. When the valve disc 3 moves, the water blocking ring 31 can block the high-speed injection of the medium, avoiding the direct impact of the medium on the inner wall and the sealing part of the valve body 1. Thus, the noise during valve operation is reduced, and the impact damage of the medium to the internal structure of the valve body 1 is reduced. Compared with the prior art, the scheme significantly improves the service life and operation comfort of the valve while maintaining the basic function of the stop valve. Specifically, the water blocking ring 31 made of rubber material has good buffering performance and can effectively absorb the impact energy of the medium. During the movement of the valve stem 4 driving the valve disc 3, the water blocking ring 31 is always on the medium flow path, forming a continuous protective barrier.

[0025] Please refer to Figure 2 and Figure 3 Further, the application also proposes that the water blocking ring 31 and the valve disc 3 are detachably connected. Through the detachable connection structure, the water blocking ring 31 can be conveniently replaced and maintained.

[0026] Please refer to Figures 1 to 3 Further, the application also proposes that the bottom of the valve disc 3 is recessed with an annular groove 32, the inner wall of the annular groove 32 is provided with threads, the water blocking ring 31 includes a threaded ring 311 and a stop ring 312, the threaded ring 311 is threadedly connected with the annular groove 32, and the stop ring 312 is arranged below the threaded ring 311.

[0027] Specifically, the annular groove 32 is a groove structure arranged circumferentially around the bottom of the valve disc 3, and the inner wall thereof is provided with internal threads. The threaded ring 311 is an annular component with external threads, and is detachably connected to the valve disc 3 through thread cooperation. The stop ring 312 is fixed below the threaded ring 311, and can be connected by welding, clamping or one-piece forming. As a preferred embodiment, the threaded ring 311 and the stop ring 312 can be made of different materials, for example, the threaded ring 311 is made of metal to ensure the connection strength, and the stop ring 312 is made of rubber to achieve the buffering function. Further, the depth of the annular groove 32 can be set to 5-8mm, and the threads are fine threads to enhance the connection stability. The assembly method of the water retaining ring 31 includes: first, pre-assembling the stop ring 312 at the bottom of the threaded ring 311, and then screwing the threaded ring 311 into the annular groove 32 of the valve disc 3 until it is in place.

[0028] Thus, the technical scheme realizes the modular design of the water retaining ring 31 through the threaded connection structure. When the stop ring 312 is worn out due to long-term use, only the threaded ring 311 needs to be rotated and disassembled to replace the water retaining ring 31 component, without the need to replace the valve disc 3 as a whole. Compared with the traditional buckle or adhesive method, the threaded connection method has higher connection reliability and sealing performance, and can effectively prevent the components from falling off due to the impact of high-pressure medium. At the same time, the split structure facilitates the selection of different materials for the stop ring 312 according to the actual working conditions, for example, in a corrosive medium environment, a corrosion-resistant rubber material can be used. This design significantly improves the maintenance convenience of the valve and the economy of component replacement under the premise of ensuring the sealing performance.

[0029] Please refer to Figure 2 and Figure 3 Further, the present application also proposes that the cross-sectional diameter of the stop ring 312 gradually increases from top to bottom.

[0030] Specifically, the cross-sectional diameter change of the stop ring 312 can be implemented in various ways. For example, the stop ring 312 can be designed as a flat-topped pyramid structure, and the side surface thereof is an inclined plane; or the inner wall surface of the stop ring 312 can be an arc-shaped concave structure, forming a shape similar to a trumpet mouth; or a multi-section structure with stepped diameter change. These designs can all achieve the effect of gradually increasing the diameter of the stop ring 312 from top to bottom. As a preferred embodiment, the inclination angle of the stop ring 312 is controlled to be between 15-45 degrees, to ensure that the medium jet can be effectively blocked, and the structure volume is not excessively increased.

[0031] Therefore, the technical scheme can effectively block the medium jet during the closing process of the valve disc 3 by designing the stop ring 312 as a gradually expanding structure. When the valve disc 3 moves downward, the gradually expanding stop ring 312 first contacts the medium flow, and the gradually increasing diameter can block the jet medium at different angles in stages, thereby significantly reducing the impact force of the medium on the inner wall of the valve body 1 and the sealing part. Compared with the prior art, this structural design can more evenly disperse the medium impact, reduce the formation of local high-pressure areas, reduce the noise during valve operation, and prolong the service life of the key components of the valve.

[0032] Further, the inner wall surface of the stop ring 312 is provided with an arc-shaped concave structure. Specifically, the arc-shaped concave structure is formed by a curved surface transition, and the radius of curvature can be adaptively adjusted according to the medium flow rate and pressure. As a preferred embodiment, the radius of curvature of the arc-shaped concave structure is 5-15 mm, and the concave depth is 3-8 mm. In addition, the surface of the arc-shaped concave structure can be polished to reduce the flow resistance, or a wear-resistant coating can be provided to prolong the service life. In terms of processing technology, the structure can be realized by injection molding or mechanical processing.

[0033] The technical scheme optimizes the inner wall structure of the stop ring 312 to generate a laminar flow effect when the medium flows, effectively weakening the impact force of the medium jet. The arc-shaped concave structure can guide the medium to flow along the preset path to avoid turbulence, and at the same time, the design reduces the direct impact of the medium on the inner wall of the valve body 1, which helps to prolong the service life of the sealing element. In actual application, this structure is particularly suitable for high-pressure differential working conditions, and when the valve disc 3 is in a half-open state, the flow state of the medium can be significantly improved.

[0034] Please refer to Figure 2 and Figure 3 Further, the application also provides that the top of the valve seat 2 is provided with a displacement slot 21, and the stop ring 312 is arranged in the displacement slot 21 when the valve disc 3 is in the closed state. The stop ring 312 is provided with a plurality of through holes, and the through holes are used to make a small part of the medium flow out through the through holes when the stop ring 312 is not completely separated from the displacement slot 21, so as to realize early diversion.

[0035] The specific structure of the accommodation groove 21 can be an annular groove with a depth slightly larger than the height of the stop ring 312, so that the stop ring 312 can be completely embedded therein. The technical scheme allows a small amount of medium to flow out in advance by providing a through hole on the stop ring 312 at the initial stage of valve opening, effectively alleviating the impact caused by sudden change of medium pressure. Specifically, when the valve disc 3 starts to rise, the stop ring 312 has not completely separated from the accommodation groove 21, at which time the medium can be shunted through the through hole, avoiding the problem of sudden injection of medium in the traditional structure. As a result, the noise during the opening of the valve is significantly reduced, and the impact on the inner wall of the valve body 1 and the sealing element is also reduced, prolonging the service life of the valve. This design is particularly suitable for situations that require frequent operation, and can effectively improve the working performance of the valve.

[0036] Please refer to Figure 2 and Figure 3 Further, the application also proposes that the bottom of the valve disc 3 and the top of the valve seat 2 are provided with elastic sealing elements 5.

[0037] Specifically, the elastic sealing element 5 can be made of rubber, polytetrafluoroethylene or silicone, etc. Among them, rubber material has good elasticity and wear resistance, polytetrafluoroethylene has corrosion resistance and self-lubricating properties, and silicone is suitable for high temperature environment. The sealing element can be fixed on the bottom of the valve disc 3 and the top of the valve seat 2 by adhesion, buckle or interference fit. As a preferred embodiment, the sealing element can be designed as an annular structure to ensure uniform sealing pressure with the corresponding contact surface. In addition, the thickness and hardness of the sealing element can be adjusted according to the pressure and temperature of the medium to adapt to different working conditions.

[0038] Please refer to Figure 2 and Figure 3 Further, the application also proposes that the bottom surface of the sealing element at the bottom of the valve disc 3 is provided with an inverted inclined surface, and the inner ring of the top surface of the sealing element at the top of the valve seat 2 is provided with a guide inclined surface, and the two guide inclined surfaces are in close contact with the sealing.

[0039] Specifically, the inverted inclined surface refers to the inclined surface formed by the bottom surface of the sealing element, and the inclined direction thereof is towards the central axis of the valve disc 3. The guide inclined surface refers to the inclined surface formed by the inner ring of the top surface of the sealing element, and the inclined direction thereof is complementary to the inverted inclined surface. The two inclined surfaces realize sealing by mutual close contact. In addition, the inclined surface can be made of wear-resistant rubber material to enhance the sealing durability. In another embodiment, micro grooves can be provided on the inclined surface for discharging residual medium when in contact.

[0040] The technical scheme realizes gradual sealing contact in the closing process of the valve disc 3 through the inclined surface matching structure. When the valve disc 3 is pressed down, the reverse inclined surface and the guide inclined surface first form linear contact, and gradually expand into surface contact with the increase of pressure. This design effectively disperses the stress concentration of the sealing surface, avoids the local wear problem easily occurring in the traditional plane sealing, and simultaneously, the inclined surface structure can quickly separate from the contact when the valve is opened, reduces the friction resistance. Compared with the existing plane sealing structure, the scheme significantly improves the service life of the sealing element, and reduces the valve operation torque.

[0041] Please refer to Figure 2 and Figure 3 Further, the application also proposes that the outer side of the valve body 1 is provided with a structure reinforcing rib 6. Through the structure reinforcing rib 6 arranged on the outer side of the valve body 1, the stress concentration generated by the medium pressure can be effectively dispersed, and the deformation or cracking of the valve body 1 under high pressure working condition is prevented. Since the stop valve bears alternating stress in the opening and closing process, the arrangement of the reinforcing rib 6 can significantly improve the fatigue resistance of the valve body 1.

[0042] The above description is only an exemplary embodiment of the application, and does not limit the patent scope of the application, and any equivalent structural transformation made according to the technical concept of the application, or direct / indirect application in other related technical fields is included in the patent protection scope of the application.

Claims

1. A pressure-reducing shut-off valve, characterized in that, The pressure-reducing shut-off valve includes: The valve body has a chamber, and the chamber has a vertically arranged opening and closing port in the middle. Valve seat, the valve seat being disposed around the opening / closing port; A valve disc is located above the valve seat and is sealed to the valve seat. A water-retaining ring is protruding from the bottom of the valve disc and the water-retaining ring is made of rubber. The lifting mechanism includes a valve stem connected to the valve disc. The valve stem is used to drive the valve disc to rise or fall, so as to open or close the opening and closing port. The water baffle ring is used to stop the sprayed medium.

2. The pressure-reducing shut-off valve as described in claim 1, characterized in that, The water-blocking ring is detachably connected to the valve disc.

3. The pressure-reducing shut-off valve as described in claim 2, characterized in that, The valve disc has an annular groove recessed at its bottom, and the inner wall of the annular groove is threaded. The water-blocking ring includes a threaded ring and a stop ring. The threaded ring is threadedly connected to the annular groove, and the stop ring is located below the threaded ring.

4. The pressure-reducing shut-off valve as described in claim 3, characterized in that, The diameter of the stop ring gradually increases from top to bottom.

5. The pressure-reducing shut-off valve as described in claim 4, characterized in that, The stop ring has a flat-topped pyramidal structure.

6. The pressure-reducing shut-off valve as described in claim 4, characterized in that, The inner wall of the stop ring has an arc-shaped concave structure.

7. The pressure-reducing shut-off valve as described in claim 4, characterized in that, The valve seat has a clearance groove on its top. When the valve disc is in the closed state, the stop ring is located in the clearance groove. The stop ring has multiple through holes. The through holes are used to allow a small portion of the medium to flow out through the through holes before the stop ring is completely detached from the clearance groove, thus achieving early diversion.

8. The pressure-reducing shut-off valve as described in claim 1, characterized in that, Both the bottom of the valve disc and the top of the valve seat are provided with elastic seals.

9. The pressure-reducing shut-off valve as described in claim 8, characterized in that, The bottom surface of the seal at the bottom of the valve disc is provided with a beveled surface, and the inner ring of the top surface of the seal at the top of the valve seat is provided with a guide beveled surface, and the two guide beveled surfaces are fitted together for sealing.

10. The pressure-reducing shut-off valve as described in claim 1, characterized in that, The valve body is provided with structural reinforcing ribs on its outer side.

Images