CN112212042A - Automatic gas cutting device - Google Patents
Automatic gas cutting device Download PDFInfo
- Publication number
- CN112212042A CN112212042A CN202010690520.5A CN202010690520A CN112212042A CN 112212042 A CN112212042 A CN 112212042A CN 202010690520 A CN202010690520 A CN 202010690520A CN 112212042 A CN112212042 A CN 112212042A
- Authority
- CN
- China
- Prior art keywords
- valve
- shut
- gas
- diaphragm
- receiving chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
-
- 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
-
- 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
-
- 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
-
- 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
- F16K1/38—Valve members of conical shape
-
- 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/126—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a diaphragm, bellows, or the like
- F16K31/1262—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a diaphragm, bellows, or the like one side of the diaphragm being spring loaded
-
- 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/60—Handles
-
- 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Safety Valves (AREA)
Abstract
A gas automatic shut-off device has a shut-off valve structure (40) disposed adjacent to a pressure receiving chamber (15) in a gas passage (11) of a device body (10). The shut-off valve structure has a valve seat (42), a shut-off valve (44), a valve spring (45) that biases the shut-off valve against the valve seat, and a valve stem (47) that protrudes from the shut-off valve toward the pressure receiving chamber. The control mechanism (50) comprises: a diaphragm (51) that covers the opening (16) of the pressure receiving chamber and receives gas pressure; an operating rod (60) connected to the diaphragm; and diaphragm springs (53,54) that urge the diaphragms toward the pressure receiving chambers. The operating rod has an operating protrusion (65), and the tip of the valve rod abuts against an abutment surface (66) formed on the operating protrusion with the force of the valve spring. The contact surface of the operation convex part has a first inclined surface (66b) approaching the central axis of the operation rod towards the diaphragm and a second inclined surface (66c) approaching the central axis of the operation rod towards the opposite side of the diaphragm.
Description
Technical Field
The present invention relates to a device capable of automatically shutting off gas supply in response to a variation in pressure of supplied gas.
Background
When the supply pressure fluctuates during the use of the gas equipment, there is a problem that the flame becomes strong or the combustion becomes unstable. In order to achieve safety for the user, various devices have been developed which automatically shut off the gas supply when the supply pressure becomes higher or lower than a predetermined pressure range.
An automatic gas shutoff device disclosed in chinese patent publication CN106763954A (hereinafter referred to as document 1) will be described. A part of the gas passage of the apparatus body is provided as a pressure receiving chamber. In the gas passage, a low-pressure cutoff valve is disposed upstream of the pressure receiving chamber, and a high-pressure cutoff valve is disposed downstream of the pressure receiving chamber. Each of the low pressure cutoff valve and the high pressure cutoff valve has a valve stem protruding toward the pressure receiving chamber. The low pressure cut-off valve is urged in a closing direction by a valve spring. The high pressure cut-off valve is urged in the opening direction by another valve spring.
The control mechanism for controlling the low pressure cutoff valve and the high pressure cutoff valve includes a diaphragm disposed above the pressure receiving chamber, an operating rod connected to the diaphragm, and a diaphragm spring for biasing the diaphragm downward. An inclined surface formed by a conical surface is formed at the lower part of the action rod.
In the device of document 1, when the supply air pressure is in a predetermined pressure range, the inclined surface of the actuating lever presses the stem of the low pressure cutoff valve against the force of the valve spring, and the low pressure cutoff valve opens. Since the inclined surface of the actuating rod is not in contact with the valve stem of the high pressure cutoff valve, the high pressure cutoff valve is opened by the force of the valve spring. As a result, the gas is allowed to flow.
When the supply pressure becomes lower than the predetermined pressure range, the operating rod moves downward, and the inclined surface thereof is separated from the stem of the low pressure cut-off valve, so that the low pressure cut-off valve is opened by the force of the valve spring. As a result, the gas flow is cut off.
When the supply pressure becomes higher than the predetermined pressure range, the operating rod moves upward, and the inclined surface presses the stem of the high-pressure cutoff valve against the force of the valve spring, thereby closing the high-pressure cutoff valve. As a result, the gas flow is cut off.
An automatic gas shutoff device disclosed in chinese patent publication CN110792814A (hereinafter referred to as document 2) includes a shutoff valve and a control mechanism for controlling the shutoff valve. This control mechanism includes a diaphragm, a diaphragm spring, and an operating rod as in the device of document 1, and further includes, as an additional configuration, first and second rods and a support block disposed in the pressure receiving chamber.
One end of a first rod is slidably connected to a tip end of a valve rod of the shut valve. The other end of the first rod and one end of the second rod are rotatably coupled to the support block via a common shaft member. A roller is mounted at the other end of the second rod.
In the device of document 2, when the supply air pressure is in a predetermined pressure range, the roller is placed on the diameter-enlarged portion of the operating rod, and the valve rod is pushed in against the force of the valve spring via the two rods, so that the shut valve is opened. When the supply air pressure is lower than the predetermined pressure range, the operating rod moves downward and the diameter-enlarged portion is disengaged from the roller, and the first and second rods release the valve rod, so that the shut valve is opened by the force of the valve spring. When the supply air pressure becomes higher than the predetermined pressure range, the operating rod moves upward to separate the diameter-enlarged portion from the roller, and the first and second rods release the valve rod, so that the shut valve is closed by the force of the valve spring.
Disclosure of Invention
Technical problem to be solved by the invention
The device of document 1 requires two shut-off valves. The device of document 2 has one shut valve, but requires two rods, rollers, and support blocks. As described above, in the apparatuses of documents 1 and 2, since the number of parts disposed in the gas passage is large, the structure is complicated, the manufacturing cost is high, and the pressure loss of the supplied gas is caused.
Technical solution for solving technical problem
In order to solve the above-described problems, an automatic gas shutoff device according to the present invention includes a device body having a gas passage, a part of which is provided as a pressure receiving chamber, a shutoff valve structure disposed in the gas passage adjacent to the pressure receiving chamber, and a control mechanism controlling the shutoff valve structure in response to a gas pressure in the pressure receiving chamber,
the shut-off valve structure includes a valve seat, a shut-off valve, a valve spring for biasing the shut-off valve toward the valve seat, and a valve rod protruding from the shut-off valve through the valve seat to the pressure receiving chamber,
the control mechanism includes a diaphragm that receives gas pressure while covering an opening of the pressure receiving chamber, an operation rod that penetrates a center portion of the diaphragm and is connected to the diaphragm, and a diaphragm spring that is disposed outside the diaphragm and biases the diaphragm toward the pressure receiving chamber,
the operating rod has an operating convex portion in the pressure receiving chamber, the tip end of the valve rod of the shut-off valve structure abuts against an abutment surface formed in the operating convex portion with the force of the valve spring,
the contact surface of the operation convex portion has a first inclined surface facing the diaphragm and approaching the central axis of the operation rod and a second inclined surface facing the opposite side of the diaphragm and approaching the central axis of the operation rod,
when the gas pressure in the pressure receiving chamber is within a predetermined pressure range, the tip end of the valve stem of the shut valve abuts against the abutment surface of the operation protrusion, whereby the shut valve is separated from the valve seat to allow the gas to flow,
when the gas pressure in the pressure receiving chamber is lower than a predetermined pressure range, the operation protrusion moves in a direction away from the opening port, whereby the tip of the valve rod abuts against a limit position of the first inclined surface of the operation protrusion or moves away from the first inclined surface, the shut valve contacts with the valve seat to shut off the gas flow,
when the gas pressure in the pressure receiving chamber is higher than a predetermined pressure range, the operation protrusion moves in a direction approaching the opening port, whereby the tip of the valve rod abuts against the limit position of the second inclined surface of the operation protrusion or moves away from the second inclined surface, and the shutoff valve contacts the valve seat to shut off the gas flow.
According to the above configuration, regardless of whether or not the function of blocking the flow of gas is provided when the gas pressure is lower than or higher than the predetermined pressure range, the shut valve is constructed as one, and there is no member inserted between the valve stem and the operating rod of the shut valve.
Preferably, the operation convex portion has a disk shape, the contact surface is formed on an outer periphery of the operation convex portion, and the first inclined surface and the second inclined surface are formed in a ring shape.
More preferably, a cylindrical surface is formed between the first inclined surface and the second inclined surface.
According to the above configuration, even if the gas pressure fluctuates in the vicinity of the center of the predetermined pressure range, the tip of the valve rod of the shut valve contacts the cylindrical surface, and therefore the shut valve can be maintained in a stationary state.
Preferably, a guide hole extending along a center axis of the operation rod is formed in an end portion of the operation rod on the pressure receiving chamber side, a guide protrusion coaxial with the operation rod is formed in a bottom wall of the device body facing the diaphragm, and the guide protrusion is slidably inserted into the guide hole.
According to the above configuration, the stable axial movement of the operating rod can be realized with a simple configuration.
Preferably, a cover for covering the diaphragm is fixed to the device body, the diaphragm spring is disposed between the cover and the diaphragm, a support cylindrical portion coaxial with the operation rod is formed in the center of the cover, a return cylinder is inserted into the support cylindrical portion so as to be movable in the axial direction, an outer end of the operation rod is inserted into the return cylinder so as to be movable in the axial direction, a first locking portion is formed at an end of the operation rod, and a second locking portion engageable with the first locking portion is formed at the return cylinder.
According to the above configuration, the reset function after the shut valve is closed when the gas pressure becomes low can be realized only by the simple structure in which the reset cylinder is inserted between the support cylinder portion of the cover and the operating rod.
More preferably, the operating rod, the support cylindrical portion, and the return cylinder are disposed to extend in the vertical direction, the return cylinder has a flange portion at an upper end thereof, the flange portion is placed on an upper end surface of the support cylindrical portion and supported by the support cylindrical portion, the second locking portion is located at a position spaced below the first locking portion in a state where the return cylinder is supported, the upper end surface of the operating rod and the upper end surface of the return cylinder are at substantially the same height when the gas pressure of the pressure receiving chamber is at an intermediate value of the predetermined pressure range, the upper end surface of the operating rod is lower than the upper end surface of the return cylinder when the gas pressure is lower than the predetermined pressure range, and the upper end surface of the operating rod is higher than the upper end surface of the return cylinder when the gas pressure is higher than the predetermined pressure range.
According to the above configuration, the normal gas flow state, the low pressure cutoff state, and the high pressure cutoff state can be easily recognized by the upper end position of the operating rod.
Preferably, the valve further comprises a relief valve structure for shutting off the flow of the gas when the gas flow rate becomes excessive, and a manual open/close valve structure, wherein the shut-off valve structure and the relief valve structure are unitized by having cylindrical valve casings, respectively, and the open/close valve comprises a pair of annular valve seat members and a globe valve interposed between the pair of annular valve seat members,
the shutoff valve structure, the pair of valve seat members of the open/close valve structure, the ball valve, and the safety valve structure are inserted into the gas passage in this order from the pressure receiving chamber toward one end of the gas passage, one of the pair of valve seat members is in contact with the valve housing of the shutoff valve structure, the other of the pair of valve seat members is in contact with the valve housing of the safety valve structure,
an annular locking projection is formed on an inner periphery of a portion adjacent to the pressure receiving chamber, the valve housing of the shut-off valve structure is locked to the locking projection, a support groove is formed on an inner periphery of the gas passage in the vicinity of the one end, and the valve housing of the relief valve structure is locked to a C-shaped ring fitted into the support groove.
According to the above configuration, the shutoff valve structure, the safety valve structure, and the opening/closing valve structure can be easily incorporated into the apparatus main body.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, the number of parts disposed in the gas passage can be reduced, and the structure can be simplified, the manufacturing cost can be reduced, and the pressure loss can be reduced.
Drawings
Fig. 1 is a perspective view of an automatic gas shutoff device according to an embodiment of the present invention.
Fig. 2 is a side view of the automatic gas shutoff device.
Fig. 3 is an exploded perspective view showing the apparatus main body, the shutoff valve structure, and the control mechanism of the automatic gas shutoff device. The components of the relief valve structure and the open/close valve structure are omitted.
Fig. 4 is a vertical cross-sectional view of the automatic gas shutoff device, showing a state in which the supply gas pressure is at the middle of the predetermined pressure range and the gas flows normally.
Fig. 5 is a cross-sectional view of the automatic gas shutoff device taken along line a-a of fig. 4.
Fig. 6 is an enlarged cross-sectional view showing an abutment surface of the operating rod and a tip end portion of the valve stem of fig. 4.
Fig. 7 is an enlarged cross-sectional view showing the contact surface of the operating rod and the tip end portion of the valve rod at the time when the supply air pressure decreases to reach the lower limit value of the predetermined pressure range.
Fig. 8 is a partial vertical cross-sectional view of the automatic gas shutoff device, showing a state in which the supply gas pressure is further reduced from the predetermined pressure range.
Fig. 9 is a partial vertical cross-sectional view of the automatic gas shutoff device, showing a state after the shutoff valve is returned from a closed state to an open position by a decrease in gas pressure.
Fig. 10 is an enlarged cross-sectional view showing a contact surface of the operating rod and a tip end portion of the valve rod at a time when the supply air pressure rises to reach an upper limit value of the predetermined pressure range.
Fig. 11 is a partial vertical cross-sectional view of the automatic gas shutoff device, showing a state in which the supply gas pressure is further increased from the predetermined pressure range.
Fig. 12 is an enlarged cross-sectional view showing a modification of the contact surface of the operating lever.
Description of the reference numerals
10 a device body; 11a gas passage; 11a locking projection; 11b a support groove; 15 a pressure receiving chamber; 16 opening the opening; a 17C-shaped ring; 18 a guide projection; 20 a safety valve configuration; 21a valve housing; 22 a safety valve; 23 a valve spring; 30 an open/close valve structure; 31a valve seat member; a 32 ball valve; 40 shut-off valve configuration; 41a valve housing; 42 a valve seat; 44 shut-off valve; 45 a valve spring; a 47 valve stem; 50 a control mechanism; 51 a diaphragm; 52a cover; 52c a support cylinder portion; 53,54 diaphragm springs; 58a reset cylinder; 58b flange portion; 58c locking part (second locking part); 60 actuating rods; 63 a guide hole; 64 locking parts (first locking parts); 65 an action convex part; 65a cylindrical surface; 65b,65 b' a first inclined surface; 65c,65 c' a second inclined surface.
Detailed Description
Hereinafter, an automatic gas shutoff device according to an embodiment of the present invention will be described with reference to the drawings.
About the device body
As shown in fig. 1 to 5, the automatic gas shutoff device includes a long and thin device body 10. A gas passage 11 extending linearly in the longitudinal direction is formed inside the apparatus body 10. A male screw portion 12 is formed at an upstream end (right side in the drawing) of the apparatus main body 10, and a joint (not shown) provided at an end of the gas supply pipe is screwed to the male screw portion 12. A hose end 13 is formed at an end portion on the downstream side (left side in the drawing) of the apparatus main body 10, and a rubber hose (not shown) extending from the gas equipment is connected to the hose end 13.
A support hole 14 that is connected to the gas passage 11 and opens on the upper surface of the apparatus main body 10 is formed on the upstream side of the apparatus main body 10. A part of the gas passage 11 (a portion adjacent to the hose end 13) is expanded on the downstream side of the support hole 14, and is provided as a pressure receiving chamber 15. The upper end of the pressure receiving chamber 15 is open. The opening is denoted by reference numeral 16. The support hole 14 and the open port 16 are parallel to each other in the center axis direction, and extend in the vertical direction perpendicular to the gas passage 11.
Valve structure
On the upstream side of the pressure receiving chamber 15 of the apparatus main body 10, a safety valve structure 20, an opening/closing valve structure 30, and a shut-off valve structure 40 are arranged in this order from upstream to downstream in the gas passage 11.
The safety valve structure 20 is configured to shut off the gas passage 11 when the flow rate of the gas becomes excessive, and includes: a cylindrical valve housing 21 having a valve seat 21 a; a relief valve 22 supported by the valve housing 21 so as to be movable in the axial direction; a valve spring 23 (coil spring) that biases the relief valve 22 in a direction away from the valve seat 21a (upstream direction). In this way, the safety valve structure 20 is unitized and can be regarded as a single body.
The opening/closing valve structure 30 includes: a pair of annular seat members 31 having a seat 31a serving as a spherical surface; a ball valve 32 that is in contact with the valve seat 31a in a state of being positioned between the pair of valve seat members 31; a coupling shaft 33 rotatably and airtightly supported by the support hole 14 of the apparatus main body 10; the knob 34 is operated. The inner end of the coupling shaft 33 is coupled to the ball valve 32 so as not to be rotatable relative thereto. The outer end of the coupling shaft 33 is coupled to the operation knob 34 so as not to be rotatable relative thereto.
A passage 32a is formed through the ball valve 32, and the passage 32a allows gas to flow therethrough while communicating with the gas passage 11. When the operation knob 34 is turned by 90 ° and the ball valve 32 is turned by 90 ° via the coupling shaft 33, the passage 32a is not communicated with the gas passage 11, and the gas flow is blocked.
The shutoff valve structure 40 is disposed adjacent to the pressure receiving chamber 15, and includes a cylindrical valve housing 41, a shutoff valve 44 housed in the valve housing 41, and a valve spring 45 (coil spring). An annular valve seat 42 is accommodated in a downstream end portion of the valve housing 41. The valve seat 42 is supported by a valve seat pressing member 43 fitted into the downstream end of the valve housing 41. These valve seat 42 and valve seat presser 43 are provided as a part of the valve housing 41. The valve spring 45 is disposed between a spring support portion at the upstream end of the valve housing 41 and the shut-off valve 44, and biases the shut-off valve 44 toward the valve seat 42. In this way, the shut valve structure 40 is also unitized.
A support rod 46 is integrally connected to the upstream side of the shut valve 44, and a valve rod 47 is integrally connected to the downstream side of the shut valve 44. The support rod 46 is coaxial with the valve rod 47. The support rod 46 is inserted through the spring support portion of the valve housing 41, and is supported by the spring support portion so as to be slidable in the axial direction. The valve rod 47 protrudes into the pressure receiving chamber 15 through the valve seat 42 and the valve seat holder 43, and is supported by the valve seat holder 43 so as to be slidable in the axial direction. The tip of the valve rod 47 has a spherical shape.
In the gas passage 11, an annular locking projection 11a is formed on the inner periphery of a portion adjacent to the pressure receiving chamber 15, and an annular support groove 11b is formed on a portion adjacent to the male screw portion 12 at the upstream end. The unitized shutoff valve structure 40 is inserted from the upstream end of the gas passage 11, the combination of the pair of seat members 31 and the globe valve 32 of the opening and closing valve structure 30 is inserted, and finally the unitized safety valve structure 20 is inserted. In this inserted state, the annular step portion 41a formed on the outer peripheral surface of the valve housing 41 of the shut-off valve structure 40 is locked to the locking convex portion 11a, the valve housing 41 of the shut-off valve structure 40 and the downstream-side valve seat member 31 are in contact with each other, the valve housing 21 of the safety valve structure 20 and the upstream-side valve seat member 31 are in contact with each other, and the pair of valve seat members 31 and the globe valve 32 are in contact with each other. Finally, the C-ring 17 (a ring formed in a C-shape) is fitted into the support groove 11b, and the upstream end of the valve housing 21 of the relief valve structure 20 is locked by the C-ring 17. In this way, the main components of the shut-off valve structure 40 and the opening/closing valve structure 30, and the safety valve structure 20 can be easily incorporated into the apparatus main body 10.
About control mechanism
The pressure receiving chamber 15 of the apparatus main body 10 is provided with a control mechanism 50 for controlling the shut valve 44 in accordance with the gas pressure. The control mechanism 50 includes, as main components: a rubber diaphragm 51 that blocks the opening 16 of the pressure receiving chamber 15; a cover 52 covering the diaphragm 51; two diaphragm springs 53,54 (coil springs) disposed between the diaphragm 51 and the cover 52; and an operating rod 60 connected to a central portion of the diaphragm 51. The details will be described below.
The upper end peripheral edge of the opening 16 extends radially outward, and an annular groove 16a is formed in the upper surface thereof. The peripheral edge of the diaphragm 51 is thick and fitted into the annular groove 16 a. The peripheral edge of the lid 52 and the upper end peripheral edge of the opening 16 are pressed and fixed by an annular pressing member 55 with the peripheral edge of the diaphragm 51 sandwiched therebetween.
The cover 52 has: a conical portion 52a which gradually increases from the peripheral edge portion toward the center; a spring support portion 52b connected to the conical portion 52 a; and a support cylindrical portion 52c projecting upward from the center of the spring support portion 52 b.
A spring support plate 56 is placed on the diaphragm 51. The actuating rod 60 extends in a direction (vertical direction in the drawing) perpendicular to the gas passage 11. More specifically, the actuating rod 60 is disposed such that the central axis thereof intersects the central axis of the stem 47 of the shut valve 44 at a right angle. The center portion of the actuating rod 60 penetrates the center portions of the diaphragm 51 and the spring support plate 56. In the operating rod 60, a support portion 61 is formed on the lower side of the diaphragm 51, and a male screw portion 62 is formed on the upper side of the spring support plate 56. The action rod 60 is coupled to the diaphragm 51 and the spring support plate 56 by tightening the nut 57 screwed to the male screw 62.
The diaphragm springs 53 and 54 are disposed between the spring support plate 56 and the spring support portion 52b of the cover 52, and bias the diaphragm 51 and the operating rod 60 downward, i.e., the pressure receiving chamber 15.
A guide hole 63 having a circular cross section and extending along the center axis of the operating rod 60 is formed in the lower end portion of the operating rod 60 (located at the inner end portion of the pressure receiving chamber 15). In the pressure receiving chamber 15 of the apparatus main body 10, a guide projection 18 having a circular cross section and projecting upward is formed coaxially with the operating rod 60 on a bottom wall facing the diaphragm 51. The guide projection 18 is slidably inserted into the guide hole 63 of the operating rod 60, thereby enabling stable axial movement of the operating rod 60.
A reset cylinder 58 is inserted into the support cylinder 52c of the cap 52 so as to be movable in the axial direction. The return cylinder 58 has a cylinder portion 58a inserted into the support cylinder portion 52c and an annular flange portion 58b extending radially outward from the upper end of the cylinder portion 58 a. Due to the self weight of the return cylinder 58, the flange portion 58b is placed on the upper surface of the support cylinder portion 52c, and the return cylinder 58 is supported by the support cylinder portion 58. The upper end portion (the end portion located outside the diaphragm 51) of the operating rod 60 is inserted into the cylindrical portion 58a of the reset cylinder 58 so as to be movable in the axial direction.
An engaging portion 64 (first engaging portion) formed of an annular step is formed on the outer periphery of the operating rod 60 in the vicinity of the upper end thereof. The tube portion 58a of the return tube 58 is divided by a plurality of slits 58s (shown only in fig. 3) extending in the axial direction, and an annular locking portion 58c (second locking portion) protruding radially inward is formed at the lower end of each divided piece. As shown in fig. 4 and 5, in a state where the flange portion 58a of the return cylinder 58 is placed on the support cylinder portion 52c of the lid 52 and the upper end surface of the operating rod 60 is at a height substantially equal to the upper end surface of the return cylinder 58, the operating rod 60 can move upward and downward relative to the return cylinder 58 by the engaging portion 58c being located at a position spaced downward from the engaging portion 64.
An annular locking portion 52d (third locking portion) protruding radially inward is formed at the upper end of the support cylindrical portion 52 c. An annular locking portion 58d (fourth locking portion) that protrudes outward in the radial direction is formed at the lower end of the split piece of the tube portion 58a of the return tube 58. In a state where the flange portion 58b of the return cylinder 58 is placed on the support cylinder portion 52c, the locking portion 58d is located at a position spaced downward from the locking portion 52d, and the return cylinder 58 can move upward relative to the support cylinder portion 52c by the distance therebetween.
The actuating lever 60 has a disc-shaped actuating protrusion 65 at its lower end. As shown in fig. 6, the outer peripheral surface of the operation projection 65 is provided as an abutment surface 66 against which the tip of the stem 47 of the shut valve 44 abuts. The contact surface 66 has a cylindrical surface 66a located at the axial center thereof and upper and lower first and second inclined surfaces 66b,66c continuous with the cylindrical surface 66 a. The upper first inclined surface 66b is formed of a conical surface inclined so as to approach the center axis of the actuating rod 60 upward (toward the diaphragm 51). The second inclined surface 66c on the lower side is formed of a conical surface inclined so as to approach the center axis of the operation rod 60 downward (toward the opposite side of the diaphragm 51).
Normal use state
Next, the operation of the automatic gas shutoff device having the above-described configuration will be described. First, a normal use state will be described with reference to fig. 5. The user opens the gas valve of the gas apparatus with the ball valve 32 of the opening and closing valve structure 30 opened. Thereby, the gas is supplied from the gas supply pipe to the gas facility through the hose through the gas passage 11 of the apparatus body 10 of the automatic gas shutoff device. The diaphragm 51 is pressed upward by the gas pressure in the pressure receiving chamber 15. The operation rod 60 is located at a position where the upper pressure by the gas pressure in the pressure receiving chamber 15 is equalized with the lower pressure by the diaphragm springs 53, 54.
When the supply air pressure is in the middle of the predetermined pressure range, as shown in fig. 5 and 6, the tip of the valve rod 47 of the shut valve 44 abuts against the center of the cylindrical surface 66a of the operating convex portion 65 of the operating rod 60 in the width direction with the force of the valve spring 45. At this time, the shut-off valve 44 is separated from the valve seat 42 to allow the gas to flow therethrough. The upper end surface of the operating rod 60 and the upper end surface of the reset cylinder 58 are at substantially the same height, and it can be confirmed from the position of the upper end surface of the operating rod 60 that the automatic gas shutoff device is in a normal gas flow state.
Even if the supply pressure increases or decreases from the middle of the predetermined pressure range, the valve rod 47 of the shut valve 44 can be maintained in a state of abutting against the cylindrical surface 66a and the shut valve 44 can be maintained in a state of being stationary at a predetermined open position as long as the axial movement of the operating protrusion 65 is extremely fine within a predetermined limited range.
When the gas pressure is lower than the predetermined limit range, the tip end of the valve rod 47 moves from the cylindrical surface 66a to the first inclined surface 66b as the operating rod 60 moves downward. When the gas pressure rises above the above-defined range, the tip end of the valve rod 47 moves from the cylindrical surface 66a to the second inclined surface 66c as the operating rod 60 moves upward. In a state where the tip end of the operating rod 60 abuts against the surface region close to the cylindrical surface 66a on the first inclined surface 66b or the second inclined surface 66c, the shutoff valve 44 is separated from the valve seat 42, and the gas flow state can be maintained.
Low voltage shut off function
When the supply air pressure decreases and reaches the lower limit value of the predetermined pressure range, the upper pressure of the diaphragm 51 by the air pressure is reduced, and the diaphragm 51 and the operation rod 60 move downward by the forces of the diaphragm springs 53 and 54. Accordingly, as shown in fig. 7, the tip end of the valve rod 47 of the shut valve 44 slides on the first inclined surface 66b of the operation protrusion 65 by the force of the valve spring 45, and reaches the limit position P1 of the first inclined surface 66 b. As a result, the shut valve 44 moves leftward to contact the valve seat 42, and the gas flow is shut off.
When the shut valve 44 is closed during use of the gas appliance, the gas pressure in the pressure receiving chamber 15 further decreases, and the operating rod 60 moves downward to the lower limit position. As a result, as shown in fig. 8, the tip end of the valve rod 47 is separated from the first inclined surface 66b of the contact surface 66 of the operation protrusion 65. The shut valve 44 can maintain a state of contact with the valve seat 42.
As shown in fig. 8, when the shut valve 44 is closed in response to a decrease in the gas pressure, the upper end surface of the actuating rod 60 becomes lower than the upper end surface of the reset cylinder 58. Therefore, the user can confirm that the gas automatic shutoff device is in the shutoff state due to the reduction in gas pressure.
Recovery from low pressure shut-off condition
In the shut-off state of fig. 8, the shut-off valve 44 is maintained in contact with the valve seat 42 even when the pressure of the gas supplied from the gas supply pipe is restored within the predetermined pressure range. This is because the gas pressure cannot be supplied to the pressure receiving chamber 15 and the diaphragm 51 cannot be pressed up.
After the user confirms that the supply air pressure has returned to the predetermined pressure range, the user grasps the flange portion 58b of the reset cylinder 58 and lifts the reset cylinder 58 as shown in fig. 9. Then, the locking portion 58c of the return cylinder 58 abuts against the locking portion 64 of the operating lever 60, and the operating lever 60 moves upward together with the return cylinder 58 against the force of the diaphragm springs 53 and 54. The upward movement of the return cylinder 58 is restricted by the engagement portion 58d coming into contact with the engagement portion 52d of the support cylinder portion 52c of the cover 52. When the return cylinder 58 reaches the upper limit position, the tip of the valve rod 47 of the shut valve 44 abuts on the center of the cylindrical surface 66a of the operating protrusion 65 of the operating rod 60. In this way, the automatic gas shutoff device can be returned to the normal use state of fig. 5. If the hand is released from the return cylinder 58, the return cylinder 58 moves downward by its own weight until the flange portion 58b comes into contact with the upper end of the support cylinder portion 52.
High voltage cutoff function
When the gas pressure in the pressure receiving chamber 15 reaches the upper limit value of the predetermined pressure range, the upward pressure of the gas pressure on the diaphragm 51 increases, and the diaphragm 51 and the operating rod 60 move upward against the force of the diaphragm springs 53 and 54. Accordingly, as shown in fig. 10, the tip end of the valve rod 47 of the shut valve 44 slides on the second inclined surface 66c of the contact surface 66 of the operation protrusion 65 by the force of the valve spring 45, and reaches the limit position P2 of the second inclined surface 66 c. As a result, the shut valve 44 moves leftward to contact the valve seat 42, and the gas flow is shut off.
When the supply air pressure rises sharply and the gas pressure exceeding the upper limit value of the predetermined pressure range is finally supplied to the pressure receiving chamber 15, the operating rod 60 moves further upward, and as a result, the valve rod 47 is separated from the second inclined surface 66c of the contact surface 66 of the operating protrusion 65 as shown in fig. 11. The shut valve 44 can maintain a state of contact with the valve seat 42. At this time, the upper end surface of the operating lever 60 is at a higher position than the upper end surface of the reset cylinder 58. The automatic gas shutoff device can be confirmed to be in a high-pressure shutoff state based on the position of the upper end surface of the operating rod 60.
Recovery from high pressure shut-off condition
When the gas appliance is cut off at high pressure when in use, the pressure receiving chamber 15 becomes low pressure because the gas in the pressure receiving chamber 15 is released from the gas appliance after the high pressure is cut off. As a result, as shown in fig. 8, the diaphragm 51 is pressed downward, and the operation protrusion 65 of the operation rod 60 passes through the valve rod 47 and moves to the lower side of the valve rod 47. As a result, the shut-off valve 44 is instantaneously separated from the valve seat 42 and then comes into contact with the valve seat 42 again. At this time, the reset cylinder 58 is returned to the normal use state, as in fig. 9.
When the shut valve 44 is shut off at a high pressure when the gas apparatus is not in use and the opening/closing valve 30 is open, the pressure receiving chamber 15 maintains the high pressure. Therefore, even if the supply pressure from the upstream end of the gas passage 11 returns to within the predetermined pressure range, the shut valve 44 is still in a state of contact with the valve seat 42. After confirming that the air supply pressure is restored to the predetermined pressure range, the user pushes down the operation lever 60 until the upper end surface thereof is at the same height as the upper end surface of the reset cylinder 58. As a result, the state is restored in which the distal end of the valve rod 47 is in contact with the center of the cylindrical surface 66a of the contact surface 66 of the operating convex portion 65, and the shut valve 44 is opened.
Action of safety valve
When the automatic gas shutoff device is not normally connected to the gas equipment and the gas flow rate increases due to, for example, the hose coming off the hose end 13, the safety valve 22 comes into contact with the valve seat 21a in the downstream direction against the force of the coil spring 23, and the gas flow is shut off. Thereafter, the gas pressure in the pressure receiving chamber 15 decreases, and therefore the shut valve 44 is also in the low-pressure shut-off state of fig. 8.
In this case, when the operation knob 34 of the opening and closing valve device 30 is rotated by 90 ° after the automatic gas shutoff device and the gas equipment are normally connected, the ball valve 32 presses the tip end of the safety valve 22, and therefore the safety valve 22 is separated from the valve seat 21a, and the gas pressure is also supplied to the downstream side of the safety valve 22. As a result, the relief valve 22 returns to the initial open state by the force of the coil spring 23. Thereafter, the ball valve 32 is rotated in the reverse direction by 90 ° to return to the initial open state. The recovery from the low-pressure shut-off state of the slave shut-off valve 44 is performed in the same manner as described above.
Fig. 12 shows a modification of the contact surface 66 of the operation projection 65 of the operation lever 60. The first and second inclined surfaces 66b ', 66 c' of the contact surface 66 are annular and have outwardly convex curved surface shapes.
The present invention is not limited to the embodiments, and various modifications can be made without departing from the spirit thereof.
The shut valve structure may be disposed downstream of the pressure receiving chamber.
Industrial applicability
The present invention can be applied to a device capable of automatically shutting off gas flow in response to a change in gas pressure.
Claims (7)
1. An automatic gas shutoff device comprising a device body having a gas passage, a part of which is provided as a pressure receiving chamber, a shutoff valve structure disposed in the gas passage adjacent to the pressure receiving chamber, and a control mechanism for controlling the shutoff valve structure in response to a gas pressure in the pressure receiving chamber,
the shut-off valve structure includes a valve seat, a shut-off valve, a valve spring for biasing the shut-off valve toward the valve seat, and a valve rod protruding from the shut-off valve through the valve seat to the pressure receiving chamber,
the control mechanism includes a diaphragm that receives gas pressure while covering an opening of the pressure receiving chamber, an operation rod that penetrates a center portion of the diaphragm and is connected to the diaphragm, and a diaphragm spring that is disposed outside the diaphragm and biases the diaphragm toward the pressure receiving chamber,
the operating rod has an operating convex portion in the pressure receiving chamber, the tip end of the valve rod of the shut-off valve structure abuts against an abutment surface formed in the operating convex portion with the force of the valve spring,
the contact surface of the operation convex portion has a first inclined surface facing the diaphragm and approaching the central axis of the operation rod and a second inclined surface facing the opposite side of the diaphragm and approaching the central axis of the operation rod,
when the gas pressure in the pressure receiving chamber is within a predetermined pressure range, the tip end of the valve stem of the shut valve abuts against the abutment surface of the operation protrusion, whereby the shut valve is separated from the valve seat to allow the gas to flow,
when the gas pressure in the pressure receiving chamber is lower than a predetermined pressure range, the operation protrusion moves in a direction away from the opening port, whereby the tip of the valve rod abuts against a limit position of the first inclined surface of the operation protrusion or moves away from the first inclined surface, the shut valve contacts with the valve seat to shut off the gas flow,
when the gas pressure in the pressure receiving chamber is higher than a predetermined pressure range, the operation protrusion moves in a direction approaching the opening port, whereby the tip of the valve rod abuts against the limit position of the second inclined surface of the operation protrusion or moves away from the second inclined surface, and the shutoff valve contacts the valve seat to shut off the gas flow.
2. The automatic gas shutoff device according to claim 1,
the operation convex portion is formed in a disc shape, the contact surface is formed on an outer periphery of the operation convex portion, and the first inclined surface and the second inclined surface are formed in a ring shape.
3. The automatic gas shutoff device according to claim 2,
a cylindrical surface is formed between the first inclined surface and the second inclined surface.
4. The automatic gas shutoff device according to claim 1,
a guide hole extending along a center axis of the operation rod is formed in an end portion of the operation rod on the pressure receiving chamber side, and a guide protrusion coaxial with the operation rod is formed in a bottom wall of the device body facing the diaphragm, and the guide protrusion is slidably inserted into the guide hole.
5. The automatic gas shutoff device according to claim 1,
a cover for covering the diaphragm is fixed to the device body, the diaphragm spring is disposed between the cover and the diaphragm,
a support cylinder portion coaxial with the operating rod is formed at the center of the cover, a reset cylinder is inserted into the support cylinder portion in an axially movable manner, an outer end portion of the operating rod is inserted into the reset cylinder in an axially movable manner,
a first locking portion is formed at an end of the operating rod, and a second locking portion engageable with the first locking portion is formed at the reset cylinder.
6. The automatic gas shutoff device according to claim 5,
the actuating lever, the support cylinder and the return cylinder extend in the vertical direction,
the reset cylinder has a flange portion at an upper end thereof, the flange portion being placed on an upper end surface of the support cylinder portion and supported by the support cylinder portion, and the second locking portion is located at a position spaced below the first locking portion in a state where the reset cylinder is supported,
when the gas pressure of the pressure receiving chamber is at the middle of the predetermined pressure range, the upper end surface of the operating rod and the upper end surface of the return cylinder are at substantially the same height, and when the gas pressure is lower than the predetermined pressure range, the upper end surface of the operating rod is lower than the upper end surface of the return cylinder, and when the gas pressure is higher than the predetermined pressure range, the upper end surface of the operating rod is higher than the upper end surface of the return cylinder.
7. The automatic gas shutoff device according to claim 1,
further comprises a safety valve structure for cutting off the gas flow when the gas flow rate becomes excessive and a manual opening and closing valve structure,
the shut-off valve structure and the safety valve structure are unitized by having cylindrical valve housings, respectively, the on-off valve including a pair of annular valve seat members and a globe valve positioned between the pair of annular valve seat members,
the shutoff valve structure, the pair of valve seat members of the open/close valve structure, the ball valve, and the safety valve structure are inserted into the gas passage in this order from the pressure receiving chamber toward one end of the gas passage, one of the pair of valve seat members is in contact with the valve housing of the shutoff valve structure, the other of the pair of valve seat members is in contact with the valve housing of the safety valve structure,
an annular locking projection is formed on an inner periphery of a portion adjacent to the pressure receiving chamber, the valve housing of the shut-off valve structure is locked to the locking projection, a support groove is formed on an inner periphery of the gas passage in the vicinity of the one end, and the valve housing of the relief valve structure is locked to a C-shaped ring fitted into the support groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010690520.5A CN112212042B (en) | 2020-07-17 | 2020-07-17 | Automatic gas cutting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010690520.5A CN112212042B (en) | 2020-07-17 | 2020-07-17 | Automatic gas cutting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112212042A true CN112212042A (en) | 2021-01-12 |
| CN112212042B CN112212042B (en) | 2021-10-22 |
Family
ID=74059118
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010690520.5A Active CN112212042B (en) | 2020-07-17 | 2020-07-17 | Automatic gas cutting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112212042B (en) |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1069719A (en) * | 1964-10-30 | 1967-05-24 | Eclipse Fuel Engineering Compa | Automatic shut-off fluid flow control valve |
| FR2441777A1 (en) * | 1978-11-16 | 1980-06-13 | Gensollen Yves | Automatic gas valve for vehicle - gives warning of low supply pressure and switches on reserve supply |
| CN2069959U (en) * | 1990-07-24 | 1991-01-23 | 湖北省监利防爆减压阀厂 | Multi-functional domestic plg pressure regulator |
| JPH07293734A (en) * | 1994-04-22 | 1995-11-10 | Aisan Ind Co Ltd | Flow rate control valve |
| JPH1185290A (en) * | 1997-09-12 | 1999-03-30 | Fujikura Rubber Ltd | Regulator with lock mechanism |
| ES1042891U (en) * | 1999-04-16 | 1999-10-01 | Taurus Sl Electrodomesticos | Tapon double safety. (Machine-translation by Google Translate, not legally binding) |
| CN201545308U (en) * | 2009-11-10 | 2010-08-11 | 李锡其 | Garbage can lid |
| CN102734515A (en) * | 2011-03-30 | 2012-10-17 | 本田技研工业株式会社 | Pressure reducing valve having shutoff mechanism |
| CN202955272U (en) * | 2012-10-18 | 2013-05-29 | 光阳产业股份有限公司 | Gas bolt |
| CN204025876U (en) * | 2014-08-08 | 2014-12-17 | 浙江埃尼斯阀门有限公司 | Built-in normal valve |
| CN106763954A (en) * | 2017-02-26 | 2017-05-31 | 台州中燃机械有限公司 | A kind of gas pipeline self-closing valve |
| CN107917231A (en) * | 2016-10-11 | 2018-04-17 | Ckd株式会社 | The manual open and close valve of weir formula |
| CN207749232U (en) * | 2017-11-24 | 2018-08-21 | 江西明恒纺织集团有限公司 | A kind of reciprocating textile industry woven cloth line cut-off machine |
-
2020
- 2020-07-17 CN CN202010690520.5A patent/CN112212042B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1069719A (en) * | 1964-10-30 | 1967-05-24 | Eclipse Fuel Engineering Compa | Automatic shut-off fluid flow control valve |
| FR2441777A1 (en) * | 1978-11-16 | 1980-06-13 | Gensollen Yves | Automatic gas valve for vehicle - gives warning of low supply pressure and switches on reserve supply |
| CN2069959U (en) * | 1990-07-24 | 1991-01-23 | 湖北省监利防爆减压阀厂 | Multi-functional domestic plg pressure regulator |
| JPH07293734A (en) * | 1994-04-22 | 1995-11-10 | Aisan Ind Co Ltd | Flow rate control valve |
| JPH1185290A (en) * | 1997-09-12 | 1999-03-30 | Fujikura Rubber Ltd | Regulator with lock mechanism |
| ES1042891U (en) * | 1999-04-16 | 1999-10-01 | Taurus Sl Electrodomesticos | Tapon double safety. (Machine-translation by Google Translate, not legally binding) |
| CN201545308U (en) * | 2009-11-10 | 2010-08-11 | 李锡其 | Garbage can lid |
| CN102734515A (en) * | 2011-03-30 | 2012-10-17 | 本田技研工业株式会社 | Pressure reducing valve having shutoff mechanism |
| CN202955272U (en) * | 2012-10-18 | 2013-05-29 | 光阳产业股份有限公司 | Gas bolt |
| CN204025876U (en) * | 2014-08-08 | 2014-12-17 | 浙江埃尼斯阀门有限公司 | Built-in normal valve |
| CN107917231A (en) * | 2016-10-11 | 2018-04-17 | Ckd株式会社 | The manual open and close valve of weir formula |
| CN106763954A (en) * | 2017-02-26 | 2017-05-31 | 台州中燃机械有限公司 | A kind of gas pipeline self-closing valve |
| CN207749232U (en) * | 2017-11-24 | 2018-08-21 | 江西明恒纺织集团有限公司 | A kind of reciprocating textile industry woven cloth line cut-off machine |
Non-Patent Citations (2)
| Title |
|---|
| 《汽车与配件》杂质编辑部等: "《汽车电器产品手册》", 30 April 1994, 上海交通大学出版社 * |
| 王红梅等: "《机械基础》", 31 March 2018, 北京理工大学出版社 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112212042B (en) | 2021-10-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2901059B1 (en) | Adjustable fixed pressure relief assembly and regulator comprising same | |
| EP2449442B1 (en) | Balanced valve cartridge | |
| EP1020779A2 (en) | Elastomeric element valve | |
| CN107795697B (en) | Stabilizer cartridge for fluid regulator | |
| US3487852A (en) | Relief valve | |
| US20200103108A1 (en) | An improved gas valve unit | |
| CA2784611A1 (en) | Pressure regulator | |
| CN112212042B (en) | Automatic gas cutting device | |
| RU2647577C2 (en) | Safety shut-off device with controlled valve disc (versions) | |
| US5048791A (en) | Shut off valve | |
| JP2009201888A (en) | Pressure reducing valve with water shut off function | |
| CN114746828B (en) | Restrictor for regulator | |
| US4325402A (en) | Bimodal, non-venting pneumatic relay | |
| US11473779B2 (en) | Gas valve for a cooktop appliance | |
| JPH07260156A (en) | Abnormal pressure safety device for gas cylinder | |
| EP3696452B1 (en) | Pressure regulator | |
| JP7152999B2 (en) | Gas release preventer and pressure regulator provided therewith | |
| JP4276412B2 (en) | Pressure regulator with shut-off mechanism | |
| JP2005282636A (en) | On-off valve with relief valve function | |
| CN111434963A (en) | Combination valve | |
| JP2022146958A (en) | Pressure governor | |
| AU2021416997A1 (en) | Gas pressure regulator | |
| JPH08193674A (en) | Gas leakage preventer | |
| JP4003969B2 (en) | Regulator with shut-off mechanism | |
| JPH01188778A (en) | Check valve |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |