CN112555539A - Split quick-insertion type hose connector - Google Patents
Split quick-insertion type hose connector Download PDFInfo
- Publication number
- CN112555539A CN112555539A CN202011565541.0A CN202011565541A CN112555539A CN 112555539 A CN112555539 A CN 112555539A CN 202011565541 A CN202011565541 A CN 202011565541A CN 112555539 A CN112555539 A CN 112555539A
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- locking
- cavity
- ring
- connecting seat
- groove
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L33/00—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses
- F16L33/02—Hose-clips
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
Abstract
The invention belongs to the technical field of hydraulic system joints, and particularly relates to a split quick-insertion type hose joint which comprises a connecting seat, a hose core connected with the connecting seat, a sealing ring, a supporting ring, a gasket, an elastic ring, a locking buckle and a plug, wherein the rear side of the connecting seat is provided with a connecting cavity, the rear side of the connecting cavity is provided with the locking cavity, the sealing ring is arranged at a step surface formed at the joint of the connecting cavity and the locking cavity, the front end surface of the sealing ring is abutted against the step surface, the supporting ring is arranged at the rear side of the sealing ring, the gasket is arranged at the rear side of the supporting ring, the front end of the plug is in threaded fit with the inner wall of the locking cavity, the front part of the plug is provided with an inner cavity, the elastic ring and the locking buckle are arranged in the inner cavity, the locking buckle is in a conical structure, the end with the smaller diameter of the locking buckle is arranged at the front side, the, an unlocking ring capable of sliding along the axial direction is arranged in the locking groove, so that the connection is reliable, and the installation and the disassembly are convenient and quick.
Description
Technical Field
The invention belongs to the technical field of hydraulic system connectors, and particularly relates to a split quick-insertion type hose connector.
Background
The hose connector is an important component for communicating pipelines in a hydraulic system and is widely applied. Common hose nipple all communicates through screw thread and hydraulic means link in the market at present, need screw up it through spanner or other appurtenance during the use, then just need dismantle with spanner or other instrument when the disconnection, and installation and operating efficiency are low, and use very inconveniently in the narrow and small place of installation space.
Disclosure of Invention
The invention aims to solve the technical problem of providing a split quick-insertion type hose connector which is reliable in connection, convenient and quick to install and disassemble, simple in structure and low in manufacturing cost.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a split quick-insertion type hose connector comprises a connecting seat, a hose core connected with the connecting seat, a sealing ring, a support ring, a gasket, an elastic ring, a locking buckle and a plug, wherein the front end of the connecting seat is of an external thread connection structure connected with a hydraulic system, the rear side of the connecting seat is provided with a connection cavity, the rear side of the connection cavity is provided with a locking cavity with the inner diameter larger than that of the connection cavity, the axis of the external thread connection structure is provided with a shaft hole communicated with the connection cavity, the sealing ring is arranged at a step surface formed at the joint of the connection cavity and the locking cavity, the front end surface of the sealing ring is abutted against the step surface, the support ring is arranged at the rear side of the sealing ring, the front end surface of the gasket is abutted against the rear end surface of the support ring, the plug is detachably connected at the rear end of the connecting seat, the front end of the plug extends into the locking cavity and is in threaded fit with the inner wall, the front end face of the plug is abutted against the rear end face of the gasket, the front part of the plug is provided with an inner cavity with a forward opening, the elastic ring and the locking buckle are arranged in the inner cavity, the locking buckle is of a conical structure, one end with a smaller diameter of the locking buckle is arranged on the front side, the elastic ring is sleeved outside the front end with a smaller diameter of the locking buckle, the rear cavity wall of the inner cavity is provided with an inner groove, the rear end with a larger diameter of the locking buckle extends into the inner groove, the locking buckle is of a petal type structure consisting of a plurality of arc-shaped petals distributed along the circumferential direction, the plurality of arc-shaped petals can move close to or far away from the axial lead of the connecting seat along the radial direction by taking the matching part of the rear end and the inner groove as the front end of a shaft, the inner diameter of the front end of the locking buckle can be reduced or increased, the front end of the hose core is provided with the connecting part, under the normality, the inner diameter of the front end of the locking buckle is smaller than the outer diameter of the connecting part, the outer peripheral face of the connecting part is provided with a locking groove, an L-shaped locking groove is arranged on the inner edge of the front end face of the locking buckle, after the connecting part is inserted into the connecting cavity, the groove opening on the front side of the locking groove is clamped into the locking groove of the locking buckle to realize axial locking of the hose core and the connecting seat, an unlocking ring capable of axially sliding is arranged in the locking groove, the ring body of the unlocking ring is provided with an unlocking groove, the connecting part continuously moves forwards, the inner diameter of the front end of the locking buckle is pushed by the unlocking ring to be increased, the front end of the locking buckle slides.
Preferably, the hose core is provided with an anti-disengaging structure at the rear side of the connecting part for preventing the hose core from disengaging from the connecting seat, and after the hose core is connected and locked with the connecting seat, the front end face of the anti-disengaging structure is abutted against the rear end face of the connecting seat or the rear end face of the plug.
Preferably, the anti-tripping structure is a detachable anti-tripping device arranged on the hose core at the rear side of the connecting seat, and after the hose core is connected and locked with the connecting seat, the rear end face of the anti-tripping front end face connecting seat is abutted.
Preferably, the axis of the hose core is provided with an axis hole which penetrates through the hose core from front to back, the rear end of the hose core is a bamboo joint head connected with the connecting pipe, and the outer peripheral surface of the bamboo joint head is of a sawtooth-shaped barb structure.
Preferably, the outer diameter of the gasket is larger than that of the support ring, and through holes matched with the connecting parts are formed in the axial centers of the gasket and the plug.
Preferably, a sealing cavity is arranged at the sealing ring in the connecting seat, the sealing ring and the support ring are arranged in the sealing ring, and the inner diameter of the connecting cavity is smaller than the inner diameter of the sealing ring and smaller than the inner diameter of the locking cavity.
Preferably, an elastic ring groove matched with the elastic ring is formed in the inner cavity corresponding to the elastic ring.
Preferably, the outer diameter of the unlocking ring is consistent with that of the connecting part.
Preferably, the axial leads of the connecting cavity, the locking cavity and the shaft hole are the axial center of the connecting seat, and the axial leads of the connecting seat and the hose core are on the same straight line.
Preferably, the inner groove is an arc-shaped groove, and the rear end face of each arc-shaped flap is of an arc-shaped structure matched with the inner groove.
The invention has the beneficial effects that: by adopting the scheme, the split quick-insertion type hose connector is convenient to use, can be manually connected and detached without tools, improves the installation and operation efficiency, is reliable in locking the connecting seat and the hose core after connection, and has the advantages of simple and exquisite structure and low manufacturing cost.
Drawings
The foregoing and other objects, features, and advantages of the invention will be apparent from the following detailed description taken in conjunction with the accompanying drawings.
Fig. 1 is a schematic cross-sectional structure diagram according to an embodiment of the present invention.
Fig. 2 is a schematic cross-sectional view of a connecting socket according to an embodiment of the invention.
Fig. 3 is a schematic structural diagram of a locking buckle according to an embodiment of the present invention.
Fig. 4 is a schematic cross-sectional view of a locking buckle according to an embodiment of the present invention.
Fig. 5 is a sectional structure diagram of the plug in an embodiment of the invention.
FIG. 6 is a partial cross-sectional view of an embodiment of the present invention at the unlocking ring.
FIG. 7 is a side view of an unlocking ring in an embodiment of the present invention
Wherein: 1 is a connecting seat, 11 is a connecting cavity, 12 is a sealing ring, 13 is a locking cavity,
2 is a hose core, 21 is a connecting part, 22 is a locking groove,
3 is a sealing ring, 4 is a supporting ring, 5 is a gasket, 6 is an elastic ring,
7 is a locking buckle, 71 is an arc-shaped flap, 711 is a locking groove,
8 is a plug, 81 is an inner cavity, 811 is an inner groove, 82 is an elastic ring groove,
9 is an unlocking ring, 91 is an unlocking groove, and 10 is anti-tripping.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Example 1: referring to fig. 1, a split quick-plugging hose coupler comprises a connecting seat 1, a hose core 2 connected with the connecting seat 1, a sealing ring 3, a support ring 4, a gasket 5, an elastic ring 6, a locking buckle 7, a plug 8 and an unlocking ring 9, referring to fig. 2, the front end of the connecting seat 1 is an external thread connection structure connected with a hydraulic system, the rear side of the connecting seat 1 is provided with a connecting cavity 11, the rear side of the connecting cavity 11 is provided with a sealing ring 12 with an inner diameter larger than that of the connecting cavity 11, the rear side of the sealing ring 12 is a locking cavity 13 with an inner diameter larger than that of the sealing ring 12, the axis of the external thread connection structure is provided with an axis hole communicated with the connecting cavity 11, the axis lines of the connecting cavity 11, the sealing ring 12, the locking cavity 13 and the axis hole are the axis line of the connecting seat 1, the axis lines of the connecting seat 1 and the hose core 2, the front end surface of the sealing ring 3 is abutted against the step surface at the joint of the connecting cavity 11 and the sealing cavity 12, the support ring 4 is arranged at the rear side of the sealing ring 3, the front end surface of the support ring 4 is abutted against the rear end surface of the sealing ring 3, the support ring 4 tightly limits the sealing ring 3 at the step surface at the front side of the sealing cavity, the front end of the hose core 2 is provided with a connecting part 21 which is inserted into the connecting cavity 11 to be connected with the connecting seat 1, the outer diameter of the connecting part 21 is consistent with the inner diameter of the connecting cavity 11, the outer diameter of the connecting part 21 is smaller than the inner diameter of the sealing ring 3, the inner diameter of the support ring 4 is not smaller than the outer diameter of the connecting part 21, after the connecting part, the sealing is formed on the step surface, a double sealing structure of step surface sealing and sealing ring sealing is formed, and the sealing performance of the connection between the hose core 2 and the connecting seat 1 is effectively guaranteed.
The gasket 5 is arranged in the locking cavity 13, the gasket 5 is positioned at the rear side of the support ring 4, the front end surface of the gasket 5 abuts against the rear end surface of the support ring 4, the gasket 5 forms tight circumferential limit on the support ring 4, the outer diameter of the gasket 5 is consistent with the inner diameter of the locking cavity 13, a through hole matched with the connecting part 21 is arranged at the axis center of the gasket 5, the inner diameter of the through hole of the gasket 5 is not smaller than the outer diameter of the connecting part 21, the plug 8 is arranged at the rear end of the connecting seat 1, the front end of the plug 8 extends into the locking cavity 13 to be in threaded fit with the inner wall of the locking cavity 13, the front end surface of the plug 8 abuts against the rear end surface of the gasket 5, the plug 8 forms reliable axial limit on the gasket 5, the position stability of the sealing ring 3 is effectively ensured, so as to ensure and improve the sealing performance of the hose joint, the outer diameters of the support ring, and two step surface sealing structures are formed in the connecting seat 1, so that the sealing performance of the hose connector is improved.
Specifically, referring to fig. 5, an inner cavity 81 with a forward opening is arranged at the front part of the plug 8, the elastic ring 6 and the locking buckle 7 are both arranged in the inner cavity 81, referring to fig. 3 and 4, the locking buckle 7 is of a conical structure, the end with a smaller diameter of the locking buckle 7 is positioned at the front side, the elastic ring 6 is sleeved outside the front end with a smaller diameter of the locking buckle 7, the locking buckle 7 is of a petal type structure formed by four arc-shaped petals 71 distributed along the circumferential direction, the rear end surfaces of the four arc-shaped petals 71 are all of an arc-shaped structure, an inner groove 811 is arranged at the rear cavity wall of the inner cavity 81, the rear end of the arc-shaped petal 71 extends into the inner groove 811 and is in structural cooperation with the inner groove 811, so that the front end of the arc-shaped petal 71 has mobility in the radial direction, the arc-shaped petal 71 can move close to/far away from the axial line of the connecting seat along the radial direction by taking the matching position of the rear end with, the arc-shaped inner groove is convenient for the arc-shaped flap 71 to turn over in the radial direction, under the normal state, due to the action of the elastic ring 6, the inner diameter of the front end of the locking buckle 7 is smaller than the outer diameter of the connecting part 21, the outer peripheral surface of the connecting part 21 is provided with the annular locking groove 22, the connecting part 21 is inserted into the connecting seat from the rear side of the connecting seat 1, the front end of the connecting part 21 of the locking buckle 7 is pushed open, and as the connecting part 21 is inserted continuously, when the locking groove 22 moves to the locking buckle 7, under the action of the elastic ring 6, the front end of the locking buckle 7 is clamped into the locking groove 22 to realize the connection and locking of the hose core 2 and the connecting seat 1, specifically, an L-shaped locking groove 711 is arranged on the inner edge of the front end surface of the arc-shaped flap 71, after the connecting part 21 is inserted into the connecting cavity 11, the front side notch of the locking groove 22 is clamped into the locking groove 711 of the locking buckle 71, so that the hose core 2 is axially locked with the connecting seat 1, and the hose core is prevented from being separated backwards.
Specifically, referring to fig. 6 and 7, an unlocking ring 9 capable of sliding along an axial direction is arranged in the locking groove 22, an unlocking groove 91 is arranged on a ring body of the unlocking ring 9, when unlocking is needed, the hose core 2 is pushed forward, the connecting part 21 continues to move forward in the connecting cavity 11, the unlocking ring 9 is in contact with the inner side wall of the front end of the locking buckle 7, the inner diameter of the front end of the locking buckle 7 is pushed to be increased, the front end of the locking buckle 7 slides into the unlocking groove 91, the hose core 2 is pulled backward, due to the fact that the outer diameter of the unlocking ring 9 is consistent with the outer diameter of the connecting part 21, the hose core 2 can be separated from the connecting seat 1, unlocking of the hose core 2 and the connecting seat 1 is achieved, the front side wall and the rear side wall of the unlocking groove 91 are inclined planes, matching with the locking buckle is facilitated, locking force can be reduced, operation of connection locking, unlocking and separation of the hose core 2 and the connecting seat 1 of the hose joint, Locking groove 22, the locking of inserting soon that 8 departments of end cap formed/unblock simple structure, it is exquisite, the operation of being convenient for, and the cost of manufacturing is low, this hose joint has very good application prospect, the structure of 7 is detained to the locking of compriseing four arc lamella 71 is exquisite, use that can relapse, long life has, utilize conical locking to detain, be transformed into axial locking force with radial elasticity, only need less radial elasticity can realize great axial locking force, the structure is exquisite, the improvement that is showing locking force, the improvement that is showing locking reliability, the reliability that this joint used has been shown to be improved.
Hose core 2 is equipped with the anticreep of avoiding hose core 2 to deviate from connecting seat 1 in the rear side department of connecting portion 21 and detains 10, the anticreep is detained 10 for having open-ended shell fragment structure, the department that corresponds of hose core 2 is equipped with the anticreep groove of cooperation anticreep thread-off 10, anticreep is detained 10 and can be dismantled with the anticreep groove and be connected, when connecting, the anticreep is detained 10 cards in anticreep groove department, the length that the restriction hose core inserted the connecting seat, in this embodiment, the rear side of end cap is in the back outside of connecting seat, connect the locking back, the preceding terminal surface of anticreep knot 10 is contradicted with end cap 8's rear end face, restriction connecting portion 21 further antedisplacement, thereby avoid causing the unblock operation of locking knot and unblock.
The axle center hole that runs through around the axle center department of hose core 2 is equipped with, and the rear end of hose core 2 is the bamboo joint head of being connected with the connecting pipe, and bamboo joint head outer peripheral face is cockscomb structure barb structure, is convenient for be connected with the connecting pipe, corresponds elastic ring 6 department in the inner chamber 81 of end cap 8 and offers the elastic ring groove 82 of cooperation elastic ring 6, and elastic ring groove 82 is used for setting up elastic ring 82, makes elastic ring 8's position stable, guarantees abundant locking force.
The working process of the invention is as follows: firstly, the external thread connecting structure of the connecting seat 1 is connected with a port of a hydraulic system, when the connecting seat is used, the anti-tripping device 10 is clamped at an anti-tripping groove of the hose core 2, then the connecting part 21 of the hose core 2 is inserted into the connecting seat 1, because the inner diameter of the front end of the locking buckle 7 is smaller than the diameter of the connecting part 21 of the hose core, under the action of thrust, the locking buckle 7 deforms by extruding the elastic ring 6, so that the connecting part 21 of the hose core 2 passes through the front end of the locking buckle 7, because the diameter of the locking groove 22 of the hose core 1 is smaller than the inner diameter of the front end of the locking buckle 7, the locking buckle 7 is in a locking state, an L-shaped locking groove at the front end of the locking buckle 7 is clamped at the side wall of the front side of the locking groove; when the disassembly is needed, the anti-tripping device 10 is only required to be taken down, the hose core 1 is pushed towards the inside of the connecting seat by force, the unlocking ring pushes the unlocking stop buckle to open the hose core under the pushing of the unlocking ring 9, and meanwhile, the hose core can be smoothly taken out along with the sliding of the unlocking ring to complete the disassembly.
Example 2: in this embodiment, end cap 8 installs back on connecting seat 1, and end cap 8's rear end face is in the rear end face front side of connecting seat 1, and the front end that the anticreep was detained 10 supports to lean on the rear end face of connecting seat 1 to carry out spacing anticreep.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiment according to the present invention are within the scope of the present invention.
Claims (10)
1. The utility model provides a components of a whole that can function independently formula hose nipple soon, includes the connecting seat, the hose core of being connected with the connecting seat, its characterized in that: the front end of the connecting seat is an external thread connecting structure connected with a hydraulic system, a connecting cavity is arranged on the rear side of the connecting seat, a locking cavity with the inner diameter larger than that of the connecting cavity is arranged on the rear side of the connecting cavity, a shaft hole communicated with the connecting cavity is arranged at the axis of the external thread connecting structure, the sealing ring is arranged at a step surface formed at the joint of the connecting cavity and the locking cavity, the front end surface of the sealing ring is abutted against the step surface, the supporting ring is arranged on the rear side of the sealing ring, the front end surface of the supporting ring is abutted against the rear end surface of the sealing ring, the gasket is arranged on the rear side of the supporting ring, the front end surface of the supporting ring is abutted against the rear end surface, the plug is detachably connected at the rear end of the connecting seat, and the front end of the plug extends into the locking cavity to be in threaded fit with the inner wall of the locking, the front end face of the plug is abutted against the rear end face of the gasket, the front part of the plug is provided with an inner cavity with a forward opening, the elastic ring and the locking buckle are arranged in the inner cavity, the locking buckle is of a conical structure, one end with a smaller diameter of the locking buckle is arranged on the front side, the elastic ring is sleeved outside the front end with a smaller diameter of the locking buckle, the rear cavity wall of the inner cavity is provided with an inner groove, the rear end with a larger diameter of the locking buckle extends into the inner groove, the locking buckle is of a petal type structure consisting of a plurality of arc-shaped petals distributed along the circumferential direction, the plurality of arc-shaped petals can move close to or far away from the axial lead of the connecting seat along the radial direction by taking the matching part of the rear end and the inner groove as the front end of a shaft, the inner diameter of the front end of the locking buckle can be reduced or increased, the front end of the hose core is provided with the connecting part, under the normality, the inner diameter of the front end of the locking buckle is smaller than the outer diameter of the connecting part, the outer peripheral face of the connecting part is provided with a locking groove, an L-shaped locking groove is arranged on the inner edge of the front end face of the locking buckle, after the connecting part is inserted into the connecting cavity, the groove opening on the front side of the locking groove is clamped into the locking groove of the locking buckle to realize axial locking of the hose core and the connecting seat, an unlocking ring capable of axially sliding is arranged in the locking groove, the ring body of the unlocking ring is provided with an unlocking groove, the connecting part continuously moves forwards, the inner diameter of the front end of the locking buckle is pushed by the unlocking ring to be increased, the front end of the locking buckle slides.
2. The split quick-connect hose coupler of claim 1, wherein: the hose core be equipped with the anti-disengaging structure who avoids the hose core to deviate from the connecting seat in the rear side department of connecting portion, after the hose core is connected the locking with the connecting seat, anti-disengaging structure's preceding terminal surface contradicts with the rear end face of connecting seat or the rear end face of end cap.
3. The split quick-connect hose coupler of claim 2, wherein: the anti-tripping structure is a detachable anti-tripping device arranged on the rear side of the connecting seat on the hose core, and after the hose core is connected and locked with the connecting seat, the rear end face of the end face connecting seat is abutted before the anti-tripping device.
4. The split quick-connect hose coupler of claim 1, wherein: the axis of the hose core is provided with a front and rear through axis hole, the rear end of the hose core is a bamboo joint head connected with the connecting pipe, and the outer peripheral surface of the bamboo joint head is of a sawtooth-shaped barb structure.
5. The split quick-connect hose coupler of claim 1, wherein: the outer diameter of the gasket is larger than that of the support ring, and through holes matched with the connecting parts are formed in the axis of the gasket and the axis of the plug.
6. The split quick-connect hose coupler of claim 1, wherein: the connecting seat is internally provided with a sealing cavity at the sealing ring, the sealing ring and the support ring are arranged in the sealing ring, and the inner diameter of the connecting cavity is less than the inner diameter of the sealing ring and less than the inner diameter of the locking cavity.
7. The split quick-connect hose coupler of claim 1, wherein: and an elastic ring groove matched with the elastic ring is formed in the inner cavity corresponding to the elastic ring.
8. The split quick-connect hose coupler of claim 1, wherein: the outer diameter of the unlocking ring is consistent with that of the connecting part.
9. The split quick-connect hose coupler of claim 1, wherein: the axial leads of the connecting cavity, the locking cavity and the shaft hole are the axial center of the connecting seat, and the axial leads of the connecting seat and the hose core are on the same straight line.
10. The split quick-connect hose coupler of claim 1, wherein: the inner groove is an arc-shaped groove, and the rear end face of each arc-shaped flap is of an arc-shaped structure matched with the inner groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011565541.0A CN112555539A (en) | 2020-12-25 | 2020-12-25 | Split quick-insertion type hose connector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011565541.0A CN112555539A (en) | 2020-12-25 | 2020-12-25 | Split quick-insertion type hose connector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112555539A true CN112555539A (en) | 2021-03-26 |
Family
ID=75033102
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011565541.0A Pending CN112555539A (en) | 2020-12-25 | 2020-12-25 | Split quick-insertion type hose connector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112555539A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117231830A (en) * | 2023-11-08 | 2023-12-15 | 宁波市昕伊达能源设备制造有限公司 | But quick connect's stainless steel bellows for gas |
-
2020
- 2020-12-25 CN CN202011565541.0A patent/CN112555539A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117231830A (en) * | 2023-11-08 | 2023-12-15 | 宁波市昕伊达能源设备制造有限公司 | But quick connect's stainless steel bellows for gas |
| CN117231830B (en) * | 2023-11-08 | 2024-03-05 | 宁波市昕伊达能源设备制造有限公司 | But quick connect's stainless steel bellows for gas |
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