Fixed ball valve for protecting valve seat spring

Abstract

The utility model discloses a fixed ball valve for protecting a valve seat spring, relates to the technical field of ball valves, and solves the problem that a solid medium enters a spring cavity. The valve seat assembly comprises a valve seat body, a spring, a mounting seat, a movable seat and a sealing piece, a mounting groove for mounting the spring is formed in the mounting seat, and the movable seat is arranged at a notch of the mounting groove in a sliding manner; the outer side end and the axial front end of the sealing piece are tightly attached to the inner wall of the valve body respectively, the inner side end of the sealing piece is tightly attached to the peripheral face of the valve seat body, the axial rear end of the sealing piece is provided with an axially-concave V-shaped groove, the front end of the movable seat is provided with a V-shaped protruding end, and the protruding end is arranged in the V-shaped groove and matched with the V-shaped groove to extrude the sealing piece. The periphery of the spring is defined by the mounting groove and the movable seat, the movable seat is driven to extrude towards the interior of the V-shaped groove through the pre-tightening force of the spring, the sealing piece is driven to be tightly pressed at the joint inwards and outwards, and therefore a solid medium is prevented from entering the mounting groove, pollution or failure of the spring caused by the solid medium is avoided, and the spring of the valve seat is effectively protected.

Description

Technical Field

[0001] The utility model relates to the technical field of ball valves, in particular to a fixed ball valve for protecting a valve seat spring. Background Art

[0002] For working conditions that process fluids containing solid media, hard-seal trunnion ball valves are one of the most suitable valve types. This type of ball valve is usually equipped with a spring behind the valve seat, and the compression preload of the spring is used to ensure a close fit between the valve seat and the ball, thereby achieving a good sealing effect. In addition, under different temperature conditions, the components of the ball valve will expand and contract due to heat and cold, which may cause the valve operation to be blocked. In order to avoid the situation where the valve is stuck due to changes in the size of the components, a spring is usually installed behind the valve seat of the ball valve. These springs are generally in the form of cylindrical helical springs or butterfly springs, which compensate for the changes in the size of the components through their expansion and contraction, thereby effectively preventing the problem of valve sticking. In order to prevent solid media from entering the spring cavity where the spring is located, a seal is usually set on the outer section of the valve seat. However, it is difficult for a simple installation seal to fit tightly with the valve body and the valve seat, so the sealing performance is relatively poor. Moreover, after long-term use, the solid medium in the fluid will gradually penetrate into the spring cavity where the spring is located through the gap between the seal and the valve seat, and deposit there. Once the solid medium fills the spring cavity, the spring will lose its necessary deformation adjustment ability, and may even cause the valve seat to get stuck and lose its sealing effect. Summary of the invention

[0003] Purpose of the utility model: In order to overcome the defects of the prior art, the utility model provides a fixed ball valve for protecting a valve seat spring, solves the problem of solid medium entering the spring cavity, and prevents the spring from failing.

[0004] The technical solution of the utility model comprises a ball, a valve body and a valve seat assembly arranged on the valve body and sealingly matched with the ball, the valve seat assembly comprises a valve seat body, a spring, a mounting seat, a movable seat and a sealing member, the valve seat body contacts with the ball to form a sealing match, the mounting seat is movably mounted on the outer peripheral surface of the valve seat body, a mounting groove for the spring to be installed is formed in the mounting seat, the movable seat is slidably arranged at the notch of the mounting groove, and the two ends of the spring are respectively pressed on the bottom of the mounting groove and the rear end of the movable seat; the cross section of the sealing member is respectively provided with an outer end, an inner end, an axial front end and an axial rear end, the outer end and the axial front end are respectively tightly attached to the inner wall of the valve body, the inner end is tightly attached to the outer peripheral surface of the valve seat body, an axially concave V-shaped groove is provided on the axial rear end, the front end of the movable seat has a V-shaped convex end, the convex end is placed in the V-shaped groove and is adapted to the V-shaped groove to extrude the sealing member.

[0005] By adopting the above technical solution, the spring is surrounded by the installation groove and the movable seat, and the preload force of the spring is used to drive the movable seat to be squeezed into the V-shaped groove, driving the seal to be pressed inward and outward at the joint, thereby preventing solid media from entering the installation groove, avoiding solid media from contaminating or failing the spring, effectively protecting the spring of the valve seat, and allowing the valve seat to maintain normal working effect for a long time.

[0006] In a possible design, enclosing arms are formed inside and outside the notch of the installation groove, respectively, and the enclosing arms contact the V-shaped groove to form an inclined surface fit.

[0007] With the above design, when the mounting seat is subjected to axial pressure from the valve seat body, the enclosing arm squeezes the V-shaped groove, so that the corresponding position of the seal is pressed more tightly against the inner wall of the valve body and the valve seat body, further enhancing the sealing effect at the joint and further reducing the possibility of solid media entering the mounting groove.

[0008] In a possible design, the rear end of the mounting seat has an axially protruding ridge, the valve seat body has a step, the step and the ridge are matched, and a wedge-shaped sealing ring is installed between the outer periphery of the step, the ridge and the inner wall of the valve body.

[0009] With the above design, the elastic force of the spring also acts on the wedge-shaped sealing ring, squeezing the wedge-shaped sealing ring to make it seal at the corresponding joint position, effectively preventing solid media from entering the joint and interfering with the normal effect of the spring.

[0010] In a possible design, a movable gap is reserved between the protruding end and the groove wall of the V-shaped groove.

[0011] With the above design, the reserved movable gap allows the movable seat to move more flexibly, which helps to increase the squeezing force on the seal and enhance the sealing effect at the joint, so that good sealing performance can be maintained even after long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a cross-sectional view of a specific embodiment of the utility model;

[0013] Figure 2 For this utility model Figure 1 A partial enlarged view of the middle A;

[0014] Among them, 1. valve seat assembly; 2. ball; 3. valve body; 11. valve seat body; 111. step; 12. spring; 13. mounting seat; 131. mounting groove; 132. enclosure arm; 133. convex ridge; 14. movable seat; 141. raised end; 15. sealing member; 151. outer end; 152. inner end; 153. axial front end; 154. V-groove; 155. movable gap; 16. wedge-shaped sealing ring. DETAILED DESCRIPTION

[0015] like Figure 1 , Figure 2 The fixed ball valve for protecting the valve seat spring shown in the figure comprises a ball 2, a valve body 3 and a valve seat assembly 1 arranged on the valve body 3 and sealingly matched with the ball 2. The valve seat assembly 1 comprises a valve seat body 11, a spring 12, a mounting seat 13, a movable seat 14 and a sealing member 15. The valve seat body 11 is in direct contact with the ball 2 to form a sealing match. The mounting seat 13 can be movably mounted on the outer peripheral surface of the valve seat body 11, and a mounting groove 131 (i.e., a spring cavity) for accommodating the spring 12 is formed inside the mounting seat 13. The movable seat 14 is slidably arranged at the notch of the mounting groove 131. The two ends of the spring 12 are respectively pressed against the bottom of the mounting groove 131 and the rear end of the movable seat 14 to maintain the preload and ensure good sealing. In this article, the direction close to the ball 2 is regarded as the front end, and the opposite direction is regarded as the rear end. The seal 15 has a specific cross-sectional shape, and has an outer end 151, an inner end 152, an axial front end 153 and an axial rear end around the cross section, wherein the outer end 151 and the axial front end 153 are close to the inner wall of the valve body 3, the inner end 152 is close to the outer peripheral surface of the valve seat body 11, and an axially concave V-shaped groove 154 is provided at the axial rear end, and the front end of the movable seat 14 has a V-shaped protruding end 141, which is placed in the V-shaped groove 154 and can match the V-shaped groove 154 on the seal 15. The spring 12 is surrounded by the mounting groove 131 and the movable seat 14 to form a relatively closed space. The joint between the mounting groove 131 and the movable seat 14 may leak. Therefore, the movable seat 14 is squeezed into the V-shaped groove 154 by the elastic force of the spring 12. Due to the special shapes of the protruding end 141 and the V-shaped groove 154, the V-shaped groove 154 expands radially inward and outward along the seal 15 after being squeezed, so that the outer end 151 and the axial front end 153 are pressed against the joint of the inner wall of the valve body 3, and the inner end 152 is pressed against the joint position of the outer peripheral surface of the valve seat body 11, so that it is difficult for the medium to enter the mounting groove 131 from the joint position between the seal 15 and the corresponding parts, thereby solving the problem of solid medium entering the spring 12 cavity and causing the spring 12 to fail, thereby improving the overall performance and reliability of the valve.

[0016] The inner and outer sides of the groove of the mounting groove 131 respectively form an enclosing arm 132, and the end surface of the enclosing arm 132 is adapted to the shape of the groove wall of the V-shaped groove 154, so that the two form an inclined contact fit. When the valve seat body 11 is impacted by the medium, the force is transmitted to the mounting seat 13, causing the mounting seat 13 to move a small distance toward the seal 15, and the enclosing arm 132 squeezes the groove wall of the V-shaped groove 154. By utilizing the shape of the inclined surface of the groove wall of the V-shaped groove 154, the force-bearing positions on both sides are respectively squeezed radially inward and outward, further reducing the possibility of solid media entering the spring 12 cavity. In this way, even under the influence of the medium pressure, the spring 12 in the valve seat can be effectively protected.

[0017] The rear end of the mounting seat 13 has an axially protruding ridge 133, and the valve seat body 11 has a step 111, which is matched with the ridge 133. A wedge-shaped sealing ring 16 is installed between the outer periphery of the step 111, the ridge 133 and the inner wall of the valve body 3. The elastic force of the spring 12 also acts on the wedge-shaped sealing ring 16, squeezing the wedge-shaped sealing ring 16 to seal the joint position of the mounting seat 13, the valve seat body 11, and the inner wall of the valve seat, effectively preventing solid media from entering the joint and interfering with the normal effect of the spring 12, and preventing the space within the range of movement of the mounting seat 13 from being disturbed by the medium.

[0018] The angles of the two sides of the protruding end 141 are larger than the angles of the side walls of the V-shaped groove 154 in a normal state, so that a movable gap 155 is reserved between the protruding end 141 and the groove wall of the V-shaped groove 154. The reserved movable gap 155 allows the movable seat 14 to move more flexibly, helps to increase the squeezing force on the sealing member 15, and enhances the sealing effect at the joint.

Claims

1. A fixed ball valve for protecting a valve seat spring, comprising a ball (2), a valve body (3), and a valve seat assembly (1) disposed on the valve body (3) and sealingly cooperating with the ball (2), characterized in that: The valve seat assembly (1) comprises a valve seat body (11), a spring (12), a mounting seat (13), a movable seat (14) and a sealing member (15); the valve seat body (11) contacts the ball (2) to form a sealing fit; the mounting seat (13) is movably mounted on the outer peripheral surface of the valve seat body (11); a mounting groove (131) for the spring (12) to be installed is formed in the mounting seat (13); the movable seat (14) is slidably arranged at the notch of the mounting groove (131); the two ends of the spring (12) are respectively pressed against the bottom of the mounting groove (131) and the rear end of the movable seat (14). The cross section of the sealing member (15) comprises an outer end (151), an inner end (152), an axial front end (153) and an axial rear end, respectively; the outer end (151) and the axial front end (153) are respectively in close contact with the inner wall of the valve body (3); the inner end (152) is in close contact with the outer peripheral surface of the valve seat body (11); an axially concave V-shaped groove (154) is provided on the axial rear end; the front end of the movable seat (14) comprises a V-shaped protruding end (141); the protruding end (141) is disposed in the V-shaped groove (154) and is adapted to the V-shaped groove (154) to extrude the sealing member (15).

2. The fixed ball valve for protecting the valve seat spring according to claim 1, characterized in that: Enclosing arms (132) are formed inside and outside the notch of the installation groove (131), respectively, and the enclosing arms (132) are in contact with the V-shaped groove (154) to form an inclined surface fit.

3. The fixed ball valve for protecting the valve seat spring according to claim 1 or 2, characterized in that: The rear end of the mounting seat (13) has an axially protruding ridge (133), the valve seat body (11) has a step (111), the step (111) and the ridge (133) are matched, and a wedge-shaped sealing ring (16) is installed between the outer periphery of the step (111), the ridge (133) and the inner wall of the valve body (3).

4. The fixed ball valve for protecting the valve seat spring according to claim 1 or 2, characterized in that: A movable gap (155) is reserved between the protruding end (141) and the groove wall of the V-shaped groove (154).

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