A gas pressure reducing valve with gas remaining indication

Abstract

The present invention relates to a gas pressure reducing valve with a gas remaining amount indication, which comprises a valve body having a high-pressure valve cavity and a pressure stabilizing valve cavity; it is characterized in that: a pressure membrane is provided in the high-pressure valve cavity, and the pressure membrane divides the high-pressure valve cavity into a high-pressure gas chamber and an installation chamber. A mandrel capable of axial movement is provided in the high-pressure valve cavity. The mandrel passes through the pressure membrane and can move up and down together with the pressure membrane. A first spring is provided in the installation chamber. A movable display block is provided in the upper part of the installation chamber. The display block is provided with a first display mark and a second display mark. A display window for displaying the first display mark or the second display mark is opened at the top of the installation chamber. The upper end of the mandrel is connected to the display block through a transmission structure, and the axial movement of the mandrel drives the display block to move through the transmission structure. The user determines whether the gas remaining amount in the high-pressure gas chamber is sufficient according to the first display mark or the second display mark displayed from the display window. If it is not sufficient, the user is reminded to replace the gas cylinder.

Description

Technical Field

[0001] The invention relates to a gas valve, in particular to a gas pressure reducing valve with a gas residual indication. Background Art

[0002] The gas pressure reducing valve is a valve that reduces the inlet gas pressure to a certain required outlet gas pressure by adjusting it, and automatically maintains a stable outlet pressure by relying on the energy of the gas itself. The existing gas pressure reducing valve can only be connected to one air inlet pipe, and one gas cylinder can only be connected to one valve body, which is limited to one tank and one valve. When the gas equipment is actually used, it is necessary to stop the gas equipment and replace the gas cylinder every time the gas on the cylinder is used up, which is inconvenient to use. For this reason, someone has invented a gas pressure reducing valve that can connect two gas cylinders at the same time. When one gas cylinder is used up, it can be switched to another gas cylinder by turning the switching wrench, without stopping the gas equipment in the middle. Only when the gas equipment is not needed temporarily, the other gas cylinder can be replaced, forming a seamless connection during the period.

[0003] No matter it is a gas pressure reducing valve connected to one gas cylinder or a gas pressure reducing valve connected to two gas cylinders, neither has the function of indicating the remaining amount of gas, that is, it is not clear how much gas is remaining in the gas cylinder. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a gas pressure reducing valve with a gas remaining indication in view of the above-mentioned existing technical status, so as to facilitate consumers to know whether there is sufficient gas in the gas cylinder.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: a gas pressure reducing valve with gas remaining indication, comprising a valve body with a high-pressure valve chamber and a pressure-stabilizing valve chamber, the high-pressure valve chamber and the pressure-stabilizing valve chamber are connected through a connecting airway, a pressure reducing valve group is arranged in the pressure-stabilizing valve chamber, an air inlet channel communicating with the high-pressure valve chamber, and an air outlet channel communicating with the pressure-stabilizing valve chamber are arranged on the valve body; it is characterized in that: a pressure membrane is arranged in the high-pressure valve chamber, the pressure membrane divides the high-pressure valve chamber into a high-pressure gas chamber isolated from each other and an installation chamber located above the high-pressure gas chamber, and a A core shaft is provided on the pressure membrane and can move up and down with the pressure membrane. A first spring is provided in the installation chamber to keep the pressure membrane moving downward. A movable display block is provided in the upper part of the installation chamber. A first display mark and a second display mark are provided on the display block. A display window for displaying the first display mark or the second display mark is opened on the top of the installation chamber. The upper end of the core shaft is connected to the display block through a transmission structure. The axial movement of the core shaft drives the display block to move through the transmission structure, so that the first display mark or the second display mark is displayed from the display window.

[0006] Preferably, the transmission structure includes a second spring that acts on the display block to keep it moving in the first lateral direction. The bottom of the display block has an inclined surface, and the upward movement of the mandrel can cooperate with the inclined surface to push the display block to move in the second lateral direction against the elastic force of the second spring. When the mandrel is in the downward state, the display block is in the first position under the action of the second spring, and the first display mark is displayed from the display window. When the mandrel is in the upward state, under the cooperation of the upper end of the mandrel and the inclined surface, the display block is in the second position, and the second display mark is displayed from the display window.

[0007] Based on the principle of inclined surface transmission, through the contact and cooperation between the mandrel and the inclined surface at the bottom of the display block, the display block is further pushed to move in the second lateral direction against the elastic force of the second spring. Finally, the display block is in the second position. If the mandrel is in the downward position, the mandrel does not contact the inclined surface at the bottom of the display block, and the display block is in the first position under the action of the spring. This transmission structure has the advantage of simple structure. Of course, the mandrel and the display block can also be associated through other transmission structures. The display block can move horizontally, or it can swing along the radial arc direction through a rack and pinion or other transmission structures.

[0008] Since the pressure film is a flexible component, it is not convenient to directly contact the spring, nor is it convenient to connect to the mandrel. To address the above problems, further improvement is made. A lower pressing plate is provided below the pressure film. The center of the lower pressing plate has a connecting portion that extends upward and passes through the center of the pressure film. An upper pressing plate is provided above the pressure film, and the upper pressing plate is sleeved outside the connecting portion. A locking member is provided on the connecting portion to connect the upper pressing plate, the pressure film, and the lower pressing plate together. The mandrel passes through the connecting portion and is fixedly connected by a snap ring located above the connecting portion. The lower end of the first spring supports on the upper pressing plate. Both the upper pressing plate and the lower pressing plate are metal or plastic parts, with a hardness and strength greater than that of the pressure film. The pressure film is locked between the upper pressing plate and the lower pressing plate by the locking member to form a complete whole. The mandrel can also be axially constrained on the lower pressing plate by the snap ring. That is, when the pressure film deforms upward, it drives the mandrel to move upward, and when the pressure film deforms downward, it drives the mandrel to move downward. The lower part of the mandrel can also form a constraint with the bottom surface of the lower pressing plate through a snap ring. In this structure, the bottom surface of the lower pressing plate just contacts the top surface of the cam.

[0009] Further improvement is made. An internal thread is connected to the spring seat in the installation cavity. The upper end of the first spring abuts against the lower part of the spring seat. The display block is arranged above the spring seat, and the mandrel passes upward through the spring seat. The position of the spring seat can be adjusted, and thus the pre-tightening pressure of the spring can be adjusted.

[0010] For further improvement, there are multiple intake channels as described above. A push rod seat is provided at the outlet end of each intake channel. The push rod seat has a transition air passage connecting the high-pressure air chamber and the intake channel. A push rod is inserted through the transition air passage. The upper end of the push rod extends out of the push rod seat, and the lower end of the push rod is used to block the transition air passage. A third spring for supporting the push rod to block the transition air passage is provided at the lower end of the push rod. The mandrel can rotate around its own axis, and a cam that can rotate together with the mandrel is fixed on the mandrel. The cam is used to press the push rod downward to move it downwards to open the transition air passage. The rotation of the cam with the mandrel can selectively press one of the push rods. Since there are multiple intake channels, multiple gas cylinders can be connected simultaneously. By rotating the cam with the mandrel, one of the push rods can be selectively pressed. The push rod moves downwards to open the corresponding transition air passage, and the gas cylinder connected to this intake channel is in use. After any gas cylinder runs out of gas, only need to rotate the mandrel to make the cam open another push rod, making the use of the gas equipment more convenient and fast.

[0011] For further improvement, a one-way valve structure that only allows gas to enter the intake channel from the outside is provided at the inlet end of the intake channel. The setting of the one-way valve enables the gas cylinder of this path to be replaced even when the gas path of another path is in a through state, because the one-way valve prevents the gas from leaking out of the valve body.

[0012] To facilitate the switching of the gas path, an adjusting wrench that can drive the mandrel to rotate is provided at the top of the above-mentioned valve body, and the display window is arranged on the adjusting wrench.

[0013] For further improvement, an adjusting seat that can rotate with the adjusting wrench is provided below the adjusting wrench. The upper end of the mandrel is connected to the adjusting seat so that it can rotate with the adjusting seat and can axially move relative to the adjusting seat. The display block is constrained on the top surface of the adjusting seat and can only reciprocate in one direction horizontally. A concave cavity for accommodating the display block is provided on the bottom surface of the adjusting wrench. The setting of the adjusting seat provides a suitable installation position for the display block and also facilitates the association of the adjusting wrench with the mandrel. On the one hand, the adjusting wrench can drive the mandrel to rotate through the adjusting seat, and on the other hand, the up and down movement of the mandrel is not restricted.

[0014] As an improvement, a strip-shaped guiding hole is opened on the above-mentioned adjusting seat. The bottom of the display block has a guiding portion that enters the strip-shaped guiding hole downward, and the inclined surface is arranged at the lower part of the guiding portion; the strip-shaped guiding hole forms a guiding constraint on the guiding portion to ensure that the display block only slides horizontally in one direction relative to the adjusting seat and the adjusting wrench. A transmission hole with a cutting plane is opened at the bottom of the adjusting seat, and the cross-sectional shape of the upper end of the mandrel matches the transmission hole. The cooperation of the non-circular hole and the mandrel with the corresponding cross-sectional shape enables the rotation of the adjusting seat to drive the mandrel to rotate, and at the same time does not affect the up and down movement of the mandrel relative to the adjusting seat. This cooperation form has a simple structure and is conducive to assembly.

[0015] For further improvement, the valve body includes a lower valve housing, an upper valve housing and a wrench seat. The upper valve housing is fixed on the lower valve housing. The pressure film is pressed between the upper valve housing and the lower valve housing. The air inlet channel, the air outlet channel and the connecting air passage are all arranged on the lower valve housing. The wrench seat is fixed on the top of the upper valve housing. One side of the adjusting wrench is pressed into the wrench seat from above and clamped in the wrench seat. An arc-shaped groove is formed on the side wall of the wrench seat. One side of the adjusting seat has a limiting strip extending out of the arc-shaped groove, and the inner walls at both ends of the arc-shaped groove limit the rotation angle of the limiting strip. The valve body is mainly divided into a lower valve housing and an upper valve housing, which is conducive to assembling the corresponding components in the valve body. The setting of the wrench seat is conducive to the assembly of the adjusting wrench and the adjusting seat.

[0016] Compared with the prior art, the advantages of the present invention are as follows: The structure of this gas pressure reducing valve has a gas surplus indication function. If there is enough gas in the high-pressure gas chamber, it will push the pressure film to deform upward and drive the mandrel to move upward. If the gas surplus in the high-pressure gas chamber is insufficient, under the action of the first spring, the pressure film will deform downward and drive the mandrel to move downward. The axial movement of the mandrel drives the display block to move horizontally through the transmission structure, so that the first display mark or the second display mark is displayed from the display window. The user determines whether the gas surplus in the high-pressure gas chamber is sufficient according to the first display mark or the second display mark displayed from the display window. If it is not sufficient, the user is reminded to replace the gas cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional structure schematic diagram of an embodiment of the present invention;

[0018] Figure 2 is a cross-sectional view of an embodiment of the present invention (state of sufficient gas surplus);

[0019] Figure 3 is a cross-sectional view of an embodiment of the present invention (state of insufficient gas surplus);

[0020] Figure 4 is a cross-sectional view of an embodiment of the present invention along the direction of the ejector rod;

[0021] Figure 5 is a three-dimensional exploded view of an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The present invention will be further described in detail below in conjunction with the embodiments of the drawings.

[0023] As Figures 1 to 5 shown, it is a preferred embodiment of the present invention.

[0024] A gas pressure reducing valve with gas residue indication, comprising a valve body 1 having a high-pressure valve chamber 1a and a pressure stabilizing valve chamber 1b. The high-pressure valve chamber 1a and the pressure stabilizing valve chamber 1b are communicated through a connecting air passage 1c. A pressure reducing valve group 4 is provided in the pressure stabilizing valve chamber 1b. The pressure reducing valve group 4 is prior art and will not be elaborated on here. An air inlet passage 1d communicating with the high-pressure valve chamber 1a and an air outlet passage 1e communicating with the pressure stabilizing valve chamber 1b are provided on the valve body 1.

[0025] A pressure film 2 is provided in the high-pressure valve chamber 1a. The pressure film 2 divides the high-pressure valve chamber 1a into a high-pressure air chamber 1a1 isolated from each other and an installation chamber 1a2 located above the high-pressure air chamber 1a1. A mandrel 3 capable of axial movement is provided in the high-pressure valve chamber 1a. The mandrel 3 is arranged on the pressure film 2 and can move up and down together with the pressure film 2. A first spring 5a for keeping the pressure film 2 in a downward movement trend is provided in the installation chamber 1a2. An upper part of the installation chamber 1a2 is provided with a movable display block 6. The display block 6 is provided with a first display mark 61 and a second display mark 62. Specifically, a label paper is pasted on the top surface of the display block. The label paper is divided into two parts, red and green. The red part of the label paper constitutes the first display mark 61, and the green part of the label paper constitutes the second display mark 62. A display window 71 for displaying the first display mark 61 or the second display mark is opened at the top of the installation chamber 1a2. The upper end of the mandrel 3 is connected with the display block 6 through a transmission structure. The axial movement of the mandrel 3 drives the display block 6 to move through the transmission structure, so that the first display mark 61 or the second display mark 62 is displayed from the display window 71.

[0026] The transmission structure includes a second spring 5b acting on the display block 6 to keep it in a moving trend in the first transverse direction. The bottom of the display block 6 has an inclined surface 611. The upward movement of the mandrel 3 can cooperate with the inclined surface 611 to push the display block 6 to move in the second transverse direction against the elastic force of the second spring 5b. If the mandrel 3 is in a downward movement state, the display block 6 is in a first position under the action of the second spring 5b, and the first display mark 61 is displayed from the display window 71. If the mandrel 3 is in an upward movement state, under the cooperation of the upper end of the mandrel 3 and the inclined surface 611, the display block 6 is in a second position, and the second display mark 62 is displayed from the display window 71.

[0027] A lower pressing disc 21 is provided below the pressure film 2. The center of the lower pressing disc 21 has a connecting portion 211 extending upward and passing through the center of the pressure film 2. An upper pressing disc 22 is provided above the pressure film 2. The upper pressing disc 22 is sleeved outside the connecting portion 211. A locking member 23 for connecting the upper pressing disc 22, the pressure film 2 and the lower pressing disc 21 together is provided on the connecting portion 211. The locking member 23 can be a nut. The mandrel 3 passes through the connecting portion 211 and is fixedly connected through a snap ring 24 located above the connecting portion 211. The lower end of the first spring 5a supports on the upper pressing disc 22.

[0028] A spring seat 5 is connected to the inner thread of the installation chamber 1a2. The upper end of the first spring 5a abuts against the lower part of the spring seat 5. The display block 6 is arranged above the spring seat 5, and the core shaft 3 passes upward through the spring seat 5.

[0029] There are multiple intake channels 1d. A one-way valve structure 10 that only allows gas to enter the intake channel 1d from the outside is provided at the inlet end of the intake channel 1d. A push rod seat 8 is provided at the outlet end of each intake channel 1d. The push rod seat 8 has a transition air passage 81 that communicates the high-pressure air chamber 1a1 and the intake passage. A push rod 82 is inserted into the transition air passage 81. The upper end of the push rod 82 passes through the push rod seat 8. The lower end of the push rod 82 is used to block the third spring 5c of the transition air passage 81. A support for the push rod 82 to block the transition air passage 81 is provided at the lower end of the push rod 82. The core shaft 3 can rotate around its own axis, and a cam 31 that can rotate with the core shaft 3 is fixed on the core shaft 3. The cam 31 is used to press the push rod 82 downward to open the transition air passage 81. The cam 31 can selectively press one of the push rods 82 as it rotates with the core shaft 3. The top surface of the cam 31 abuts against the bottom surface of the pressing disc 21. The bottom surface of the cam 31 has a downward protrusion for pushing and cooperating with the push rod 82.

[0030] An adjusting wrench 7 that can drive the core shaft 3 to rotate is provided at the top of the valve body 1. The display window 71 is arranged on the adjusting wrench 7. An adjusting seat 9 that can rotate with the adjusting wrench 7 is provided below the adjusting wrench 7. The upper end of the core shaft 3 is connected to the adjusting seat 9 so that it can rotate with the adjusting seat 9 and can axially move relative to the adjusting seat 9. The display block 6 is constrained on the top surface of the adjusting seat 9 and can only reciprocate in one direction in the horizontal direction. A concave cavity 72 for accommodating the display block 6 is provided on the bottom surface of the adjusting wrench 7.

[0031] A strip-shaped guiding hole 91 is formed on the adjusting seat 9. The bottom of the display block 6 has a guiding portion 61 that enters downward into the strip-shaped guiding hole 91. The inclined surface 611 is arranged at the lower part of the guiding portion 61. A transmission hole 92 with a cutting plane is formed at the bottom of the adjusting seat 9. The cross-sectional shape of the upper end of the core shaft 3 matches the transmission hole 92.

[0032] The valve body 1 in this embodiment includes a lower valve housing 11, an upper valve housing 12 and a wrench seat 13. The upper valve housing 12 is fixed on the lower valve housing 11. The pressure film 2 is pressed between the upper valve housing 12 and the lower valve housing 11. The air inlet passage 1d, the air outlet passage 1e and the connecting air passage 1c are all arranged on the lower valve housing 11. The wrench seat 13 is fixed on the top of the upper valve housing 12. One side of the adjusting wrench 7 is pressed into the wrench seat 13 from above and clamped in the wrench seat 13. An arc-shaped groove 131 is formed on the side wall of the wrench seat 13. One side of the adjusting seat 9 has a limiting strip 93 extending out of the arc-shaped groove 131. The inner walls at both ends of the arc-shaped groove 131 limit the rotation angle of the limiting strip 93. A guiding hole 111 for guiding the lower end of the mandrel 3 is formed at the corresponding position of the lower valve housing 11.

[0033] The working principle and process of this embodiment are as follows.

[0034] Process of indicating the remaining gas: If there is enough gas in the high-pressure gas chamber 1a1, it will push the pressure film 2 to deform upward, driving the mandrel 3 to move upward against the elastic force of the first spring 5a. The upward movement of the mandrel 3 can cooperate with the inclined surface 611 at the bottom of the display block 6, pushing the display block 6 to move in the second horizontal direction against the elastic force of the second spring 5b, so that the display block 6 is in the second position, and the second display mark 62 (the green label paper part) is displayed from the display window 71.

[0035] If the remaining gas in the high-pressure gas chamber 1a1 is insufficient, under the action of the first spring 5a, the pressure film 2 deforms downward, driving the mandrel 3 to move downward. If the mandrel 3 is in the downward movement state, the display block 6 is in the first position under the action of the second spring 5b, and the first display mark 61 (the red label paper part) is displayed from the display window 71, reminding the user to replace the gas cylinder.

[0036] Process of replacing the gas cylinder: When the first display mark 61 (the red label paper part) is displayed from the display window 71, it reminds the user to replace the gas cylinder. During switching, turn the adjusting wrench 7 counterclockwise by 180 degrees. The adjusting seat 9, the mandrel 3 and the cam 31 rotate synchronously with the adjusting wrench 7. The cam 31 presses the ejector rod 82 downward to open the corresponding transition air passage 81. The gas from the gas cylinder on the other side enters the high-pressure gas chamber 1a1 through the air inlet passage 1d and the transition air passage 81 on the corresponding side. At the same time, the ejector rod 82 on the other side is not triggered by the cam 31, and the ejector rod 82 moves upward under the action of the third spring 5c to block the transition air passage 81 on that side.

[0037] It should be noted that in the description of this embodiment, the orientation or positional relationship indicated by terms such as "front, back", "left, right", "up, down", etc. are all based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. The terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A gas pressure reducing valve with gas remaining indication, comprising a valve body (1) having a high-pressure valve chamber (1a) and a voltage stabilizing valve chamber (1b), the high-pressure valve chamber (1a) and the voltage stabilizing valve chamber (1b) are communicated through a connecting air passage (1c), a pressure reducing valve group (4) is arranged in the voltage stabilizing valve chamber (1b), an air inlet passage (1d) communicated with the high-pressure valve chamber (1a) and an air outlet passage (1e) communicated with the voltage stabilizing valve chamber (1b) are arranged on the valve body (1); characterized in that: A pressure film (2) is provided inside the high-pressure valve cavity (1a). The pressure film (2) divides the high-pressure valve cavity (1a) into a mutually isolated high-pressure gas chamber (1a1) and an installation chamber (1a2) located above the high-pressure gas chamber (1a1). A mandrel (3) capable of axial movement is provided inside the high-pressure valve cavity (1a). The mandrel (3) passes through the pressure film (2) and can move up and down together with the pressure film (2). A first spring (5a) for keeping the pressure film (2) in a downward movement trend is provided inside the installation chamber (1a2). A movable display block (6) is provided in the upper part of the installation chamber (1a2). A first display mark and a second display mark (62) are provided on the display block (6). A display window (71) for displaying the first display mark or the second display mark is opened at the top of the installation chamber (1a2). The upper end of the mandrel (3) is connected to the display block (6) through a transmission structure. The axial movement of the mandrel (3) drives the display block (6) to move through the transmission structure, so that the first display mark or the second display mark (62) is displayed from the display window (71). The transmission structure includes a second spring (5b) acting on the display block (6) to keep it in a moving trend in the first transverse direction. The bottom of the display block (6) has an inclined surface (611). The upward movement of the mandrel (3) can cooperate with the inclined surface (611) to push the display block (6) to move in the second transverse direction against the elastic force of the second spring (5b). If the mandrel (3) is in a downward movement state, the display block (6) is in the first position under the action of the second spring (5b), and the first display mark is displayed from the display window (71). If the mandrel (3) is in an upward movement state, under the cooperation of the upper end of the mandrel (3) and the inclined surface (611), the display block (6) is in the second position, and the second display mark (62) is displayed from the display window (71).

2. The gas pressure reducing valve with gas residue indication according to claim 1, wherein: A lower pressing plate (21) is provided below the pressure film (2). The center of the lower pressing plate (21) has a connecting portion (211) extending upward and passing through the center of the pressure film (2). An upper pressing plate (22) is provided above the pressure film (2). The upper pressing plate (22) is sleeved outside the connecting portion (211). A locking member (23) for connecting the upper pressing plate (22), the pressure film (2) and the lower pressing plate (21) together is provided on the connecting portion (211). The mandrel (3) passes through the connecting portion (211) and is fixedly connected through a snap ring (24) located above the connecting portion (211). The lower end of the first spring (5a) supports on the upper pressing plate (22).

3. The gas pressure reducing valve with gas residue indication according to claim 2, wherein: A spring seat (5) is threadedly connected inside the installation chamber (1a2). The upper end of the first spring (5a) abuts against the lower part of the spring seat (5). The display block (6) is provided above the spring seat (5), and the mandrel (3) passes upward through the spring seat (5).

4. The gas pressure reducing valve with gas surplus indication according to claim 1, characterized in that: There are multiple intake channels (1d). A tappet seat (8) is provided at the outlet end of each intake channel (1d). The tappet seat (8) has a transition air passage (81) that communicates the high-pressure air chamber (1a1) and the intake passage. A tappet (82) is inserted through the transition air passage (81). The upper end of the tappet (82) passes through the tappet seat (8), and the lower end of the tappet (82) is used to block the transition air passage (81). A third spring (5c) for supporting the tappet (82) to block the transition air passage (81) is provided at the lower end of the tappet (82). The core shaft (3) can rotate around its own axis, and a cam (31) that can rotate together with the core shaft (3) is fixed on the core shaft (3). The cam (31) is used to press the tappet (82) downward to move it downwards to open the transition air passage (81). As the core shaft (3) rotates, the cam (31) can selectively press one of the tappets (82).

5. The gas pressure reducing valve with gas margin indication according to claim 4, characterized in that: A one-way valve structure (10) that only allows gas to enter the intake channel (1d) from the outside is provided at the inlet end of the intake channel (1d).

6. The gas pressure reducing valve with gas margin indication according to claim 4, characterized in that: An adjusting wrench (7) that can drive the core shaft (3) to rotate is provided at the top of the valve body (1). The display window (71) is provided on the adjusting wrench (7).

7. The gas pressure reducing valve with gas margin indication according to claim 6, characterized in that: An adjusting seat (9) that can rotate with the adjusting wrench (7) is provided below the adjusting wrench (7). The upper end of the core shaft (3) is connected to the adjusting seat (9) so that it can rotate with the adjusting seat (9) and can axially move relative to the adjusting seat (9). The display block (6) is constrained on the top surface of the adjusting seat (9) and can only reciprocate in one direction in the horizontal direction. A concave cavity (72) for accommodating the display block (6) is provided on the bottom surface of the adjusting wrench (7).

8. The gas pressure reducing valve with gas residue indication according to claim 7, characterized in that: A strip-shaped guide hole (91) is formed in the adjusting seat (9). A guide portion (61) that enters the strip-shaped guide hole (91) downward is provided at the bottom of the display block (6). An inclined surface (611) is provided at the lower part of the guide portion (61). A transmission hole (92) with a cutting plane is formed at the bottom of the adjusting seat (9). The cross-sectional shape of the upper end of the core shaft (3) matches the transmission hole (92).

9. The gas pressure reducing valve with gas margin indication according to claim 7, wherein: The valve body (1) includes a lower valve housing (11), an upper valve housing (12), and a wrench seat (13). The upper valve housing (12) is fixed on the lower valve housing (11). The pressure membrane (2) is pressed between the upper valve housing (12) and the lower valve housing (11). The intake channel (1d), the outlet channel (1e), and the connecting air passage (1c) are all provided on the lower valve housing (11). The wrench seat (13) is fixed on the top of the upper valve housing (12). One side of the adjusting wrench (7) is pressed into the wrench seat (13) from above and is clamped in the wrench seat (13). An arc-shaped groove (131) is formed on the side wall of the wrench seat (13). A limiting strip (93) that extends out of the arc-shaped groove (131) is provided on one side of the adjusting seat (9). The inner walls at both ends of the arc-shaped groove (131) perform corner limiting on the limiting strip (93).

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