Self-compensating high-performance C-type ball valve for harsh working conditions
By using self-compensating soft and hard valve seat design and support ring assembly, the C-type ball valve achieves bidirectional sealing under high and low pressure, solving the problems of valve sealing and maintenance costs under harsh working conditions, and improving the valve's sealing performance and service life.
Patent Information
- Application Number
- CN202520000926.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-02
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2035-01-02
AI Technical Summary
Existing C-type ball valves are prone to jamming and difficulty in opening and closing due to media scaling under harsh operating conditions. They have poor one-way sealing performance, cannot achieve bidirectional shut-off at high and low pressures, and suffer from serious leakage after the hard-seal valve seat wears out, resulting in high maintenance costs.
It adopts a self-compensating soft and hard valve seat design, combined with components such as support ring, hard valve seat, valve cover, and disc spring to achieve double sealing. The soft valve seat automatically compensates when worn to ensure bidirectional sealing at high and low pressures, and the concentricity is adjusted by friction-reducing adjusting shims to improve sealing performance.
It meets the requirements for bidirectional shut-off under harsh operating conditions, reducing maintenance costs, solving the problems of valve leakage and difficulty in opening and closing, and improving sealing performance and service life.
Smart Images
Figure CN223708608U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to C type ball valve technical field. BACKGROUND
[0002] Ball valves are widely used in LNG working conditions, high temperature working conditions and other harsh working conditions due to simple structure, convenient opening and closing operation and good flow capacity. Because the conventional ball valve contains two valve seats and a ball body, the sealing is realized by the medium force acting on the valve seat, and the medium is easy to enter the middle cavity when the ball valve is opened or closed. In the coal chemical industry, the coal raw material contains solid particles, ash content, sulfur content, and ash, fine powder and black ash water generated after production, which will adversely affect the valve. The medium is easy to scale on the surface of the middle cavity and the ball body, causing the valve to be blocked, difficult to open and close, and even causing the process device to stop under extreme conditions.
[0003] The existing C type ball valve usually adopts hard sealing or soft sealing structure between one valve seat and the ball body, and the valve seat is fixed on the valve cover through expansion or fastening. In order to ensure the sealing performance, the machining precision of the sealing pair, valve stem and ball body is high. Because the valve seat cannot float, when the valve seat sealing surface is damaged, the limit of the closing position of the fine adjustment driving mechanism can only be relied on to solve the problem.
[0004] The existing C type ball valve can only be sealed in one direction, and when the medium in the pipeline flows back, the sealing pair will leak, and high and low pressure bidirectional cutting cannot be realized. INVENTION CONTENTS
[0005] In view of the deficiencies of the prior art, the utility model provides a harsh working condition self-compensating high-performance C type ball valve, which comprises a ball body, a supporting ring, a hard valve seat, a valve cover, a disc spring, a bottom shaft, a soft valve seat placing groove is arranged on the supporting ring, the end face of the placing groove is provided with a round spring II placing hole, the hard valve seat is provided with a soft valve seat stop, the hard valve seat is connected with the supporting ring through threads, the valve cover is provided with three stepped holes, the supporting ring and the hard valve seat are placed on the first stepped hole and the third stepped hole, the bottom plane of the second stepped hole is provided with a round spring I placing hole, the round spring I acts on a sealing ring pressure ring, the sealing ring pressure ring acts on a sealing ring I, one side of the sealing ring I is provided with a partition ring, the disc spring is placed on the left end face of the hard valve seat, two contact surfaces are arranged on the contact part of the bottom shaft and the ball body, a radial cylindrical surface is matched with a bearing I arranged on the ball body, and an antifriction adjusting pad is arranged on the axial circular surface.
[0006] Preferably, the supporting ring is provided with a dust groove I, and the supporting ring is provided with four flat surfaces for convenient installation.
[0007] Preferably, the hard valve seat is provided with a dust groove II and an anti-falling boss.
[0008] Preferably, the sealing surface of the hard valve seat and the sealing surface of the ball body are both hardened and matched ground.
[0009] Preferably, O-rings are arranged in the inner and outer diameter directions of the spacer ring. Advantages
[0010] By the design of self-compensating soft and hard valve seats, the requirements of high and low pressure bidirectional cut-off of the valve under harsh working conditions are met. Meanwhile, when the soft and hard valve seats are worn, automatic compensation towards the ball direction can be performed, thereby ensuring the sealing of the valve; the double sealing effect valve seat assembly can solve the problem of valve leakage caused by wear or scratch of the hard sealing valve seat, thereby saving maintenance cost; the toric surface of the bottom shaft is provided with an antifriction adjusting pad, which can adjust the concentricity between the ball and the valve seat assembly, thereby improving the sealing performance between the sealing pairs of the valve. BRIEF DESCRIPTION OF DRAWINGS
[0011] Figure 1 is a schematic view of the overall structure;
[0012] Figure 2 is Figure 1 is a partial enlarged view of the middle I part;
[0013] Figure 3 is a schematic view of the support ring structure;
[0014] Figure 4 is a schematic view of the hard valve seat structure;
[0015] Figure 5 is a schematic view of the valve cover structure.
[0016] In the drawings: 1, ball; 2, valve cover; 3, bottom shaft; 4, antifriction adjusting pad; 5, bearing I; 6, support ring; 7, round spring II; 8, soft valve seat; 9, hard valve seat; 10, disc spring; 11, spacer ring; 12, sealing ring I; 13, sealing ring pressing ring; 14, round spring I; 15, O-ring; 16, soft valve seat placing groove; 17, round spring II placing hole; 18, dustproof groove I; 19, flat surface facilitating installation; 20, soft valve seat stop; 21, dustproof groove II; 22, anti-extrusion boss; 23, first stepped hole; 24, second stepped hole; 25, third stepped hole; 26, round spring I placing hole. DETAILED DESCRIPTION
[0017] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.
[0018] Reference Figures 1-5The support ring is machined with a soft valve seat placing groove in the outer diameter direction, the end face of the placing groove is machined with a round spring II placing hole, the outer circle of the right end of the support ring is machined with a section of external thread, the outer diameter direction of the left end of the support ring is machined with a dustproof groove I, and the left end face of the support ring is milled with four planes for convenient installation. The inner diameter direction of the hard valve seat is machined with a soft valve seat stop, the outer diameter direction is machined with a dustproof groove II and an anti-extrusion boss, and the inner diameter direction of the left end is machined with a section of internal thread, which can be matched with the external thread of the support ring. The sealing surface of the hard valve seat and the sealing surface of the ball are both hardened and matched ground, so as to be combined into a metal hard sealing structure. The soft valve seat is placed on the stop in the inner diameter direction of the hard valve seat, the round spring II is put into the placing hole at the right end of the support ring, and the support ring is tightened. Under the pre-tightening force of the round spring II, the soft valve seat is pressed in the space formed by the support ring and the hard valve seat. The sealing surface of the soft valve seat matched with the ball is formed by machining, and the sealing force of the soft valve seat can be adjusted by tightening and loosening the support ring. The valve seat assembly with double sealing function can solve the problem of valve leakage caused by wear or scratch of the hard sealing valve seat, and save maintenance cost.
[0019] The valve cover is machined with three stepped holes near the ball side, the valve seat assembly is placed in the first and third stepped holes, the bottom plane of the second stepped hole is machined with a round spring I placing hole, the round spring I acts on the sealing ring pressing ring, the sealing ring pressing ring acts on the sealing ring I, the right end of the sealing ring I is designed with a spacer, and O-rings are placed in the inner diameter and outer diameter directions of the spacer respectively. The disc spring is placed on the left end face of the hard valve seat, and exerts a pre-tightening force on the valve seat assembly towards the ball. When the medium pressure on the valve cover side is greater than that on the valve body side, the medium force and the pre-tightening force of the round spring I act on the sealing ring pressing ring at the same time, so that the sealing surface of the valve seat assembly and the sealing surface of the ball are in contact to realize positive sealing. When the medium pressure on the valve cover side is less than that on the valve body side, the medium enters the disc spring cavity along the gap between the hard valve seat and the valve seat pressing ring, the medium acting area of the disc spring cavity is greater than the acting area formed between the valve seat assembly and the ball, and the medium force and the pre-tightening force of the disc spring act on the valve seat assembly at the same time, so that the sealing surface of the valve seat assembly and the sealing surface of the ball are in contact to realize reverse sealing. This structure solves the problem of poor reverse sealing performance of ordinary C-type ball valves, and meets the requirements of high and low pressure bidirectional cut-off of valves under harsh working conditions. At the same time, when the valve seat assembly is worn, the valve seat assembly can automatically compensate towards the ball under the action of the round spring I and the disc spring, thereby ensuring the sealing of the valve.
[0020] Two contact surfaces are arranged at the contact position of the bottom shaft and the ball, the radial cylindrical surface cooperates with the bearing I installed on the ball to improve the carrying capacity of the lift valve in the direction of the pipeline center line, and the axial annular surface is installed with a friction-reducing adjusting pad to adjust the concentricity between the ball and the valve seat assembly and improve the sealing performance between the sealing pairs of the valve.
[0021] It is to be understood that the terminology "first" and "second" and the like used herein is merely intended to differentiate one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between such entities or operations.
Claims
1. A self-compensating high performance C-type ball valve for severe service comprising a ball, a support ring, a hard seat, a bonnet, a disc spring, a bottom shaft, characterized in that, The support ring is provided with a soft valve seat placing groove, the end face of the placing groove is provided with a round spring II placing hole, the hard valve seat is provided with a soft valve seat stop, the hard valve seat is connected with the support ring through threads, the valve cover is provided with three stepped holes, the support ring and the hard valve seat are placed on the first stepped hole and the third stepped hole, the bottom plane of the second stepped hole is provided with a round spring I placing hole, the round spring I acts on a sealing ring pressing ring, the sealing ring pressing ring acts on a sealing ring I, the sealing ring I has a spacer ring on one side, a disc spring is placed on the left end face of the hard valve seat, the contact part of the bottom shaft and the ball is provided with two contact surfaces, a radial cylindrical surface cooperates with a bearing I installed on the ball, and an antifriction adjusting pad is installed on an axial annular surface.
2. The self-compensated high-performance C-type ball valve for severe service according to claim 1, characterized in that The support ring is provided with a dustproof groove I, and the support ring is provided with four flat surfaces for convenient installation.
3. The self-compensated high-performance C-type ball valve for severe service according to claim 1, characterized in that The hard valve seat is provided with a dustproof groove II and an anti-extrusion boss.
4. The self-compensated high-performance C-type ball valve for severe service according to claim 1, characterized in that The sealing surface of the hard valve seat and the sealing surface of the ball are both subjected to hardening treatment and are matched and ground.
5. The self-compensated high-performance C-type ball valve for severe service according to claim 1, characterized in that O-rings are respectively placed in the inner diameter direction and the outer diameter direction of the spacer ring.