CN215214833U

CN215214833U - Deep-cooling ball valve with snap spring valve seat

Info

Publication number: CN215214833U
Application number: CN202120434230.4U
Authority: CN
Inventors: 尚玉来; 金瑞建; 金卡迪; 吕智健; 李平; 林光办; 谷尚铸
Original assignee: Zhejiang Bertley Technology Co ltd
Current assignee: Zhejiang Bertley Technology Co ltd
Priority date: 2021-03-01
Filing date: 2021-03-01
Publication date: 2021-12-17
Anticipated expiration: 2031-03-01

Abstract

The utility model relates to a deep cooling ball valve with a snap spring valve seat installed on the upper part, which comprises a valve body, a ball body and a valve seat, wherein the diameter of the inner hole of the valve seat is equal to that of the channel of the valve body; the method is characterized in that: the valve seat is arranged in the valve body through the clamp spring and the spring seat, the problem that threads are easily extruded, deformed and damaged is solved, the requirement on the matching precision between the valve seat and the spring seat is low, and the valve seat has the advantages of simple processing technology, convenience in assembly, reliability in sealing, good product quality and the like. Is suitable for the working conditions of cryogenic media such as liquid nitrogen, liquid oxygen and the like at the temperature of 196 ℃ below zero.

Description

Deep-cooling ball valve with snap spring valve seat

Technical Field

The utility model belongs to the valve field especially relates to a top-mounted cryrogenic ball valve. The utility model is suitable for subzero medium working conditions such as liquid nitrogen and liquid oxygen at-196 ℃.

Background

At present, the upper-mounted cryogenic ball valves at home and abroad mostly adopt a threaded valve seat structure or a hinge valve seat structure. The metal valve seat of the threaded valve seat structure is installed in the valve body through the threaded ring, in a deep cooling working condition, the metal valve seat and the threaded ring are both made of austenitic stainless steel materials, and the austenitic stainless steel materials have the characteristics of low hardness and high toughness; the disadvantages are that: the metal valve seat and the threaded ring are made of the same material, the metal valve seat and the threaded ring are easy to engage when in threaded fit, the threads are difficult to screw in place during installation, screw teeth are extruded and deformed and damaged by uneven force application in the screwing process, and even scrap iron falls to damage a soft sealing surface of the valve seat; moreover, the threaded valve seat requires high machining precision, the requirements on clearance and tolerance fit are accurate and appropriate, the machining difficulty is high, and the threaded valve seat is particularly not suitable for large-caliber deep cooling ball valves. The hinge of the hinge valve seat structure is formed by splicing a plurality of sections of circular arcs, is complex to manufacture and troublesome to install, and has hidden danger of falling off of a hinge connection joint in the using process and poor reliability.

Disclosure of Invention

The utility model discloses shortcoming to prior art exists provides a jump ring disk seat facial make-up cryrogenic ball valve that processing is easy, simple to operate, use and sealing performance is reliable.

The technical scheme of the utility model includes the valve body, the spheroid, the valve seat sealing face inlays dress rubber seal circle and constitutes soft sealing pair with the spheroid mutually supporting, the valve seat has the first outer face of cylinder, the second outer face of cylinder, the third outer face of cylinder that the diameter reduces gradually from being close to spheroid one end to keeping away from the outer face of spheroid one end, the valve body has the first cylinder chamber and the second cylinder chamber that the internal diameter reduces gradually from valve pocket one side to keeping away from the passageway of valve pocket one side, the movable seal cooperation between the second outer face of cylinder of valve seat and the second cylinder intracavity wall of valve body, the valve seat hole equals with the valve body passageway diameter; the method is characterized in that: a spring seat is arranged in an annular cavity between a second outer cylindrical surface of the valve seat and the inner wall of a first cylindrical cavity of the valve body, the inner hole wall of the spring seat is in clearance fit with the second outer cylindrical surface of the valve seat, the outer cylindrical surface is in clearance fit with the inner wall of the first cylindrical cavity of the valve body, the axial length of the spring seat is smaller than that of the annular cavity, so that the spring seat can axially move in the annular cavity, a radial inner step is arranged in an inner hole of the spring seat, a spring is arranged between a radial outer step between the first outer cylindrical surface and the second outer cylindrical surface of the valve seat and a radial inner step of the inner hole of the spring seat, an annular clamping groove is arranged on the outer cylindrical surface of the spring seat, and a circular clamping spring with an opening is arranged in the annular clamping groove; a radial inner step is arranged between the second cylindrical cavity of the valve body and the channel, and an axial space is arranged between the radial inner step and the end face of the valve seat.

In the technical scheme, a lip-shaped rubber sealing ring is arranged between the third outer cylindrical surface of the valve seat and the inner wall of the second cylindrical cavity of the valve body, the opening of the lip-shaped rubber sealing ring faces the end surface of the valve seat, and a steel ring is embedded in the opening of the lip-shaped rubber sealing ring; the steel ring is pressed in the opening of the lip-shaped rubber sealing ring by a pressing ring and a split spacer ring, the split spacer ring is clamped in a clamping groove in the third outer cylindrical surface of the valve seat, a clamping groove is formed in the outer cylindrical surface of the split spacer ring, and a clamp is installed in the clamping groove.

In the technical scheme, an annular shoulder is arranged on the spring seat and positioned on the inner side of the valve cavity.

Compared with the prior art, the utility model beneficial effect be: the valve seat is arranged in the valve body through the clamp spring and the spring seat, the problem that threads are installed in a threaded mode and are prone to extrusion deformation and damage is solved, and the valve seat has the advantages of being simple in machining process, convenient to assemble, good in use and sealing reliability and the like.

Drawings

Fig. 1 is an assembly schematic diagram of the present invention.

Fig. 2 is a schematic view of a partial structure of the valve seat of fig. 1 according to the present invention.

In the figure: 1 spheroid, 2 spring seats, 3 disk seats, 4 opening circular jump rings, 5 springs, 6 lip rubber seal, 7 clamps, 8 to the spacer ring, 9 valve bodies, 10 clamping rings, 11 steel rings, 12 rubber seal.

Detailed Description

The snap spring valve seat upper-mounted type cryogenic ball valve shown in fig. 1 and fig. 2 comprises a valve body 9, a ball body 1 and a valve seat 3, wherein a rubber seal ring 12 is embedded in a sealing surface of the valve seat 3 and is matched with the ball body 1 to form a soft sealing pair, a first outer cylindrical surface, a second outer cylindrical surface and a third outer cylindrical surface, the diameter of which is gradually reduced, are arranged on the outer cylindrical surface of the valve seat 3 from one end close to the ball body 1 to the end far away from the ball body 1, a first cylindrical cavity and a second cylindrical cavity, the inner diameter of which is gradually reduced, are formed in a channel of the valve body 9 from one side of a valve cavity to one side far away from the valve cavity, the second outer cylindrical surface of the valve seat 3 is in dynamic sealing fit with the inner wall of the second cylindrical cavity of the valve body 9, a piston type structure is formed between the second outer cylindrical surface of the valve seat 3 and the second cylindrical cavity of the valve body 9, and the diameter of the inner hole of the valve seat 3 is equal to that of the channel of the valve body 9; the method is characterized in that: a spring seat 2 is arranged in an annular cavity between a second outer cylindrical surface of a valve seat 3 and the inner wall of a first cylindrical cavity of a valve body 9, the inner hole wall of the spring seat 2 is in clearance fit with the second outer cylindrical surface of the valve seat 3, the outer cylindrical surface of the spring seat 2 is in clearance fit with the inner wall of the first cylindrical cavity of the valve body 9, the axial length of the spring seat 2 is smaller than that of the annular cavity, so that the spring seat 2 can move axially in the annular cavity, a radial inner step is arranged in an inner hole of the spring seat 2, a spring 5 is arranged between a radial outer step between the first outer cylindrical surface and the second outer cylindrical surface of the valve seat 3 and the radial inner step of the inner hole of the spring seat 2, the valve seat 3 is pushed to a sphere 1 for compression sealing, an annular clamping groove is arranged on the outer cylindrical surface of the spring seat 2, and a circular clamping spring 4 with an opening is arranged in the annular clamping groove; a radial inner step is arranged between the second cylindrical cavity of the valve body 9 and the passage, and an axial space is arranged between the radial inner step and the end surface of the valve seat 3, and the axial space ensures that the valve seat 3 has enough axial displacement. The valve body 9 adopts an integrated structure, the upper end of the valve body is provided with a circular opening for placing the ball body 1 into the valve cavity, the valve seat 3 and the spring seat 2 are made of austenitic stainless steel materials, the open circular clamp spring 4 is made of an open elastic stainless steel ring, and the valve body 9, the ball body 1, the valve seat 3 and the spring seat 2 are formed by post-processing through a cryogenic treatment process, so that the component has ultralow temperature resistance.

During assembly, the circular snap spring 4 with the opening is moved to the outer circular surface outside the annular clamping groove of the spring seat 2, the spring seat 2 is pushed into the annular cavity, the valve seats 3 on the two sides move towards the channels on the two sides, and the ball body 1 is arranged in the valve cavity and is located at a full-closed position with the valve seats 3. Then, the spring seat 2 is tensioned to enable the valve seat 3 to be in compression contact with the ball body 1, the open circular clamp spring 4 is clamped into the annular clamping groove in the outer circular surface of the spring seat 2, the valve seat 3 and the ball body 1 are compressed and sealed by the aid of the open circular clamp spring 4 and the spring 5, assembly is simple and convenient, and requirements on machining accuracy of the valve seat 3 and the spring seat 2 are low.

During the dismantlement, take out opening circular jump ring 4 from the ring groove of the excircle face of spring holder 2, disk seat 3 moves back in the 9 passageways of valve body, can take out spheroid 1, disk seat 3. The disassembly and the maintenance are convenient.

The valve seat 3 has a DBB function, so that bidirectional sealing is realized, and meanwhile, the valve seat 3 can automatically release pressure to a low-pressure end when the middle cavity is in overpressure, so that the use safety and the sealing reliability of the cryogenic ball valve are ensured.

A lip-shaped rubber sealing ring 6 is arranged between the third outer cylindrical surface of the valve seat 3 and the inner wall of the second cylindrical cavity of the valve body 9, the opening of the lip-shaped rubber sealing ring 6 faces the end surface direction of the valve seat 3, namely, the direction departing from the valve cavity, a steel ring 11 is embedded in the opening of the lip-shaped rubber sealing ring 6, the steel ring 11 is pushed by medium pressure to prop open the lip-shaped rubber sealing ring 6, and the self-sealing performance between the outer cylindrical surface of the valve seat 3 and the inner cavity wall of the valve body 9 is enhanced; steel ring 11 is by clamping ring 10, split spacer ring 8 pressure equipment is in lip rubber seal 6's opening, 11 roof pressures of steel ring are in lip rubber seal 6's opening with clamping ring 10 one end, the other end and the contact of split spacer ring 8, prevent 6 axial displacement wearing and tearing of lip rubber seal, guarantee the sealing performance after 3 automatic pressure release of disk seat, split spacer ring 8 clamps in the draw-in groove of 3 third outer cylindrical surfaces of disk seat, its outer circumferential surface is equipped with the chucking groove, install clamp 7 in the chucking groove, clamp 7 will be to split spacer ring 8 chucking in the chucking inslot of disk seat 3.

An annular shoulder is arranged on the inner side of the valve cavity of the spring seat 2 and used for installing a special dismounting tool, so that the assembly is facilitated.

Claims

1. A snap spring valve seat upper-mounted type cryogenic ball valve comprises a valve body (9), a ball body (1) and a valve seat (3), wherein a rubber seal ring (12) is embedded in a sealing surface of the valve seat (3) and is matched with the ball body (1) to form a soft seal pair, a first outer cylindrical surface, a second outer cylindrical surface and a third outer cylindrical surface which are gradually reduced in diameter are arranged on the outer cylindrical surface of the valve seat (3) from one end close to the ball body (1) to one end far away from the ball body (1), a first cylindrical cavity and a second cylindrical cavity which are gradually reduced in inner diameter are formed in a channel of the valve body (9) from one side of the valve cavity to one side far away from the valve cavity, the second outer cylindrical surface of the valve seat (3) is in dynamic seal fit with the inner wall of the second cylindrical cavity of the valve body (9), the inner hole of the valve seat (3) is equal to the diameter of the channel of the valve body (9), the valve body (9) adopts an integrated structure, and the cavity is provided with a ball body mounting port; the method is characterized in that: a spring seat (2) is arranged in an annular cavity formed between a second outer cylindrical surface of a valve seat (3) and the inner wall of a first cylindrical cavity of a valve body (9), the inner hole wall of the spring seat (2) is in clearance fit with the second outer cylindrical surface of the valve seat (3), the outer cylindrical surface is in clearance fit with the inner wall of the first cylindrical cavity of the valve body (9), the axial length of the spring seat (2) is smaller than that of the annular cavity, so that the spring seat (2) can move axially in the annular cavity, a radial inner step is arranged in an inner hole of the spring seat (2), a spring (5) is arranged between a radial outer step between the first outer cylindrical surface of the valve seat (3) and the second outer cylindrical surface and a radial inner step of the inner hole of the spring seat (2), an annular clamping groove is formed in the outer cylindrical surface of the spring seat (2), and a circular clamping spring (4) with an opening is arranged in the annular clamping groove; a radial inner step is arranged between the second cylindrical cavity of the valve body (9) and the channel, and an axial space is arranged between the radial inner step and the end face of the valve seat (3).

2. The snap spring valve seat top-mounted cryogenic ball valve according to claim 1, which is characterized in that: a lip-shaped rubber sealing ring (6) is arranged between the third outer cylindrical surface of the valve seat (3) and the inner wall of the second cylindrical cavity of the valve body (9), the opening of the lip-shaped rubber sealing ring (6) faces the end surface direction of the valve seat (3), and a steel ring (11) is embedded in the opening of the lip-shaped rubber sealing ring (6); the steel ring (11) is pressed in an opening of the lip-shaped rubber sealing ring (6) through a pressing ring (10) and a split spacer ring (8), the split spacer ring (8) is clamped in a clamping groove in the third outer cylindrical surface of the valve seat (3), a clamping groove is formed in the outer cylindrical surface of the split spacer ring, and a clamp (7) is installed in the clamping groove.

3. The deep-cooling ball valve with the snap spring and the valve seat mounted on the snap spring as claimed in claim 1 or 2, which is characterized in that: an annular convex shoulder is arranged on the inner side of the valve cavity of the spring seat (2).