Top-mounted soft sealing ball valve with high sealing performance

Abstract

The utility model relates to a top-mounted soft sealing ball valve with high sealing performance, which belongs to the field of valves and comprises a valve body, a valve cover, a valve rod, a valve seat and a ball body, the valve body is provided with an inlet channel, an outlet channel and a middle cavity mounting port, the valve cover is mounted on the middle cavity mounting port, and a spring seat and a positioning ring are arranged between the outer circumference of the valve seat and the valve body. A valve seat sealing ring and the surface of the ball body are pressed and matched to form a sealing pair; the ball valve is characterized in that the positioning ring adopts a chain type circular ring, is embedded between the radial annular outer step of the spring seat and the radial inner step of the valve body, has high rigidity, is not easy to deform under high pressure, has good positioning stability on the valve seat, can ensure the sealing specific pressure between the valve seat and the ball body, and has the advantages of reliable sealing performance, convenience in disassembly and assembly of the positioning ring and the like.

Description

Technical Field

[0001] The utility model belongs to the field of valves, and particularly relates to an upper-mounted soft-sealed ball valve. Background Art

[0002] For an upper-mounted ball valve, the ball and the valve seat are installed from the middle cavity of the valve body. During installation, first, the valve seat is retracted into the channels on both sides of the valve cavity by rotating the threaded ring. After the ball is installed, the threaded ring is rotated in the reverse direction to press the valve seat against the ball. Its disadvantages are that a wrench is required to operate the rotating valve seat push ring, and during the operation, it is easy to collide with and scratch the surface of the ball, causing damage to the sealing surface of the ball and affecting the sealing performance. Moreover, during the operation, uneven force will squeeze and deform the screw teeth and cause damage, and even iron filings will fall off to damage the soft sealing surface of the valve seat and lead to the failure of the thread fit.

[0003] In order to solve the above problems existing in the installation of the valve seat thread, a spring seat is arranged on the outer circular surface of the valve seat, and the valve seat is integrally installed in the valve body channel by the cooperation of a clamping groove arranged on the outer circular surface of the spring seat and a snap ring. Its disadvantage is that the snap ring is a thin-walled elastic sheet. Under the working condition of high-pressure medium, the medium pressure will push the snap ring on the outlet-side valve seat to compress and deform, causing the whole outlet-side valve seat to move in the fluid flow direction, resulting in a decrease in the sealing specific pressure between the sealing surface of the outlet-side valve seat and the sealing surface of the ball. And the ball of the ball valve is pushed by the medium pressure, and the sealing specific pressure of the sealing pair on the inlet side is relatively low. Therefore, when the sealing specific pressure of the outlet-side sealing pair decreases, it is easy to cause sealing leakage. Summary of the Utility Model

[0004] Aiming at the disadvantages of the prior art, the utility model provides a high-sealing-performance upper-mounted soft-sealed ball valve that uses a rigid chain to form a positioning ring to position the valve seat, improves the positioning stability of the valve seat, prevents the valve seat from being displaced by the medium pressure, and is convenient for loading and unloading the positioning ring and has reliable sealing performance.

[0005] The technical solution for realizing the utility model is as follows:

[0006] A high sealing performance top-loading soft-sealed ball valve comprises a valve body, a valve cover, a valve stem, a valve seat and a ball. The valve body has an inlet channel, an outlet channel and a middle cavity installation port. The valve cover is installed on the middle cavity installation port. The valve seat enters the inlet channel and the outlet channel from the middle cavity installation port. The ball enters the valve cavity from the middle cavity installation port. The ball is fixedly installed in the valve cavity. A spring seat and a positioning ring are arranged between the outer circumference of the valve seat and the valve body. The valve seat sealing ring is pressed and matched with the surface of the ball to form a sealing pair. The positioning ring adopts a chain The bar-type circular ring is embedded between the radial annular outer step of the spring seat and the radial inner step of the valve body. The chain-type circular ring is composed of a number of circular arc chains of the same structure that are hingedly connected to each other head to tail. The ends of two adjacent circular arc chains are connected to each other by means of a card slot and a card plate. Positioning holes are respectively arranged at the card slot and the card plate. Countersunk positioning screws pass through the positioning holes of the card slot and the card plate to hinge the two circular arc chains. At least one disassembly window is provided in the circumferential direction of the radial annular outer step of the spring seat to facilitate the installation and disassembly of the circular arc chain.

[0007] In the above technical scheme, the clamping slot and the clamping plate are respectively arranged at the two ends of the circular arc chain, and are located in the middle position of the ring plane on both sides of the circular arc chain. The positioning hole on the ring plane on one side of the clamping slot adopts a countersunk hole, and the positioning hole on the ring plane on the other side adopts a hexagonal hole. The hexagonal nut is embedded in the hexagonal hole, and the front end external thread of the countersunk positioning screw and the internal thread of the hexagonal nut are matched and connected with each other, and the rear end is sunk into the countersunk hole.

[0008] In the above technical solution, a ball positioning hole is provided at the center of the lower end surface of the valve cover, a positioning cone is provided at the center of the upper end of the sphere and is movably matched with the ball positioning hole, a sleeve is provided between the outer cylindrical surface of the positioning cone and the inner hole wall of the ball positioning hole, and a positioning shaft is provided at the center of the lower end of the sphere and is concentric with the positioning cone, and the positioning shaft is movably matched with the shaft hole at the bottom of the valve cavity.

[0009] Compared with the prior art, the utility model has the following beneficial effects: the positioning ring between the valve seat and the valve body adopts a chain-type circular ring, which has high rigidity, is not easily deformed by medium pressure, has good valve seat positioning stability, has a high sealing pressure ratio of the sealing pair, has reliable sealing performance, and is easy to install and disassemble the positioning ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the utility model.

[0011] Figure 2 This utility model Figure 1 A magnified view of the local structure at point A.

[0012] Figure 3 This utility model Figure 1 Schematic diagram of the installation structure of the middle valve seat, spring seat and locating ring.

[0013] Figure 4 This utility model Figure 1 Schematic diagram of the structure of the positioning ring.

[0014] In the figure: 1 valve body, 2 valve cover, 3 valve stem, 4 ball, 5 valve seat, 6 spring seat, 7 positioning ring, 8 sealing ring, 9 spring chamber, 10 disassembly window, 11 positioning hole. DETAILED DESCRIPTION

[0015] like Figures 1-4 The high sealing performance top-mounted soft-sealed ball valve shown in the figure comprises a valve body 1, a valve cover 2, a valve stem 3, a valve seat 5, and a ball 4. The valve body 1 has an inlet channel, an outlet channel and a middle cavity installation port. The valve cover 2 is installed on the middle cavity installation port. The valve seat 5 is installed in the inlet channel and the outlet channel through the middle cavity installation port. The ball 4 enters the valve cavity through the middle cavity installation port. The ball 4 is fixedly installed in the valve cavity. A spring seat 6 and a positioning ring 7 are arranged between the outer circumference of the valve seat 5 and the valve body 1. The sealing ring 8 of the valve seat 5 is pressed and matched with the surface of the ball 4 to form a sealing pair. The sealing ring 8 adopts a rubber sealing ring to form a soft sealing structure with the ball 4, as shown in FIG. Figure 2 As shown; its characteristic is that: the positioning ring 7 adopts a chain-type circular ring, which is embedded between the radial annular outer step of the spring seat 6 and the radial inner step of the valve body 1, and the chain-type circular ring is composed of a plurality of circular arc chains of the same structure, which are mutually hinged head to tail, and the ends of two adjacent circular arc chains are connected to each other by a card slot and a card plate, and positioning holes 11 are respectively provided at the card slot and the card plate, and countersunk positioning screws pass through the positioning holes 11 of the card slot and the card plate to hinge the two circular arc chains, such as Figure 4 The radial annular outer step of the spring seat 6 is provided with at least one circumferential direction to facilitate the installation and disassembly window 10 of the arc chain, as Figure 3 A spring is installed in a spring chamber 9 between the valve seat 5 and the spring seat 6.

[0016] During installation, first connect the circular arc chains of the positioning ring 7 into an open-loop chain, install and retract the valve seat 5 into the inlet channel and the outlet channel respectively, install the ball 4 into the valve cavity, use special tools to pull the two valve seats 5 towards each other and press them against the ball 4, install the open-loop chain between the radial annular outer step of the spring seat 6 and the radial inner step of the valve body 1, align the opening position of the open-loop chain with the disassembly window 10 of the spring seat 6, pass the countersunk positioning screw through the positioning hole 11, and connect the open-loop chain into a circular positioning ring 7 to achieve the positioning of the valve seat 5. The thickness of each circular arc chain of the positioning ring 7 is selected according to the gap distance between the radial annular outer step of the spring seat 6 and the radial inner step of the valve body 1. It has high rigidity, is not easy to deform under high pressure, has good positioning stability for the valve seat 5, can ensure the sealing pressure ratio between the valve seat 5 and the ball 4, and is easy to disassemble and assemble the positioning ring 7.

[0017] The clamping slot and clamping plate are respectively arranged at the two ends of the circular arc chain and are located in the middle of the ring planes on both sides of the circular arc chain. The positioning hole 11 on the ring plane on one side of the clamping slot is a countersunk hole, and the positioning hole 11 on the ring plane on the other side is a hexagonal hole. A hexagonal nut is embedded in the hexagonal hole. The front end external thread of the countersunk positioning screw and the internal thread of the hexagonal nut are matched and connected with each other, and the rear end is sunk into the countersunk hole. The front end of the countersunk positioning screw refers to one end of the front threaded part of the countersunk positioning screw, and the rear end of the countersunk positioning screw refers to one end of the operating screw head. The countersunk positioning screw is inserted from the countersunk hole on one side of the clamping slot and is threadedly connected with the hexagonal nut in the hexagonal hole on the other side of the clamping slot, so as to hinge the two adjacent circular arc chains, and the two ends of the countersunk positioning screw are retracted into the ring planes on both sides of the positioning ring 7.

[0018] A ball positioning hole is provided at the center of the lower end surface of the valve cover 2, and a positioning cone is provided at the center of the upper end of the ball 4, which is movably matched with the ball positioning hole. A shaft sleeve is provided between the outer cylindrical surface of the positioning cone and the inner hole wall of the ball positioning hole to reduce the rotational friction between the positioning cone of the ball 4 and the ball positioning hole of the valve cover 2. A positioning shaft concentric with the positioning cone is provided at the center of the lower end of the ball 4, and the positioning shaft is movably matched with the shaft hole at the bottom of the valve cavity.

Claims

1. A top-entry soft-sealed ball valve with high sealing performance, comprising a valve body (1), a valve cover (2), a valve stem (3), a valve seat (5), and a ball (4). The valve body (1) has an inlet passage, an outlet passage, and a middle cavity mounting port. The valve cover (2) is installed on the middle cavity mounting port. A spring seat (6) and a positioning ring (7) are arranged between the outer circumference of the valve seat (5) and the valve body (1) to tightly press-fit the sealing ring (8) of the valve seat (5) with the surface of the ball (4) to form a sealing pair; its characteristics are: The positioning ring (7) is a chain-type circular ring, which is fitted between the radial annular outer step of the spring seat (6) and the radial inner step of the valve body (1). The chain-type circular ring is composed of a plurality of arc chains with the same structure, which are hinged to each other end to end. The ends of adjacent two arc chains are connected by inserting a clamping groove and a clamping plate into each other. Positioning holes (11) are respectively arranged at the clamping groove and the clamping plate. A countersunk positioning screw passes through the positioning holes (11) of the clamping groove and the clamping plate to hinge and connect the two arc chains; at least one disassembly and assembly window (10) for facilitating the installation and disassembly of the arc chain is arranged on the circumferential direction of the radial annular outer step of the spring seat (6).

2. The top-mounted soft-sealed ball valve with high sealing performance according to claim 1, characterized in that: The clamping groove and the clamping plate are respectively arranged at both ends of the arc chain and are located at the middle position of the two side ring planes of the arc chain. The positioning hole (11) on one side ring plane of the clamping groove is a countersunk hole, and the positioning hole (11) on the other side ring plane is an internal hexagonal hole. An internal hexagonal nut is fitted in the internal hexagonal hole. The external thread at the front end of the countersunk positioning screw is in threaded connection with the internal thread of the internal hexagonal nut, and the rear end sinks into the countersunk hole.

3. The top-mounted soft-sealing ball valve with high sealing performance according to claim 1 or 2, characterized in that: A spherical positioning hole is arranged at the center of the lower end face of the valve cover (2). The upper center of the sphere (4) has a positioning round platform that is in clearance fit with the spherical positioning hole. A shaft sleeve is arranged between the outer cylindrical surface of the positioning round platform and the inner hole wall of the spherical positioning hole. A positioning shaft concentric with the positioning round platform is arranged at the center of the lower end of the sphere (4). The positioning shaft is in clearance fit with the shaft hole at the bottom of the valve cavity.

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