Gas pressure reducing valve capable of limiting maximum output pressure and instantly locking adjusted pressure

Abstract

The utility model belongs to the technical field of pressure regulating equipment, and particularly relates to a gas pressure reducing valve capable of limiting the highest output pressure and immediately locking the regulated pressure, which comprises a valve body, a gas inlet pipe and a gas outlet pipe are arranged on the valve body, the valve body is internally divided into a high-pressure cavity and a low-pressure cavity, the gas inlet pipe is communicated with the high-pressure cavity, and the gas outlet pipe is communicated with the low-pressure cavity. And the air outlet pipe is communicated with the low-pressure cavity. According to the utility model, the maximum value limit of the output pressure is created for the first time, so that the rotary hand wheel can be ensured to meet the maximum value limit and cannot continuously rotate when the output pressure is adjusted, and the phenomena that the hand wheel is screwed excessively, so that a safety valve is opened, back pressure gas leaks, and finally, the back pressure gas leaks and gas in carbonated beverage and beer leaks are avoided; and therefore, the output pressure value can be ensured to be always below the opening pressure of the safety valve.

Description

Technical Field

[0001] The utility model belongs to the technical field of pressure reducing valves, and in particular relates to a gas pressure reducing valve with a maximum output pressure limit and instant locking of the regulating pressure. Background Art

[0002] Currently, directing beer from the barrel to the beer dispensing line and then from the dispensing line to the beer tap requires air intake from the gas line to create backpressure, thus providing the power for dispensing. Similar use cases include the distribution of bottled carbonated beverages and the carbonation of beer and carbonated beverages during the brewing and production process. The gas in the gas line comes from a high-pressure gas cylinder and requires appropriate pressure reduction.

[0003] The gas used as the gas source is usually composed of carbon dioxide, nitrogen or a mixture of carbon dioxide and nitrogen.

[0004] It's well known that the taste of beer or carbonated beverages is crucially determined by their carbonation concentration, which is determined by the solubility of carbonic acid (carbon dioxide dissolved in water). Under the same solvent and temperature conditions, the pressure of the solute (carbon dioxide) becomes the key factor in determining carbonation concentration. Therefore, the gas pressure output by a gas pressure reducing valve is a crucial factor influencing the taste of beer or carbonated beverages.

[0005] Different brands or different styles of beer and carbonated drinks of the same brand have different carbonation sensations when entering the mouth. Therefore, different brands, types, and series of barreled beer and barreled carbonated drinks require different gas pressures when dispensed and distributed at the terminal, so that the beer and carbonated drinks dispensed at the terminal have the same taste as when they left the factory.

[0006] Therefore, gas pressure reducing valves play an important role in the terminal distribution and production of barreled beer and barreled carbonated beverages. Among them, convenient and fast adjustment of gas pressure and locking the correct pressure are particularly important.

[0007] In addition, pressure reducing valves are basically equipped with a safety valve to ensure safety, that is, when the pressure exceeds the opening pressure value set by the safety valve, it will automatically exhaust to the atmosphere and reduce the pressure. When the pressure reducing valve is installed, each brewery and carbonated beverage company will adjust the pressure reducing valve outlet pressure according to its own process. However, it is easy for the user to adjust the pressure too high when adjusting. When the pressure inside the pressure reducing valve just slightly exceeds the opening pressure value of the safety valve, slight exhaust will be generated, and the human ear is extremely difficult to hear the exhaust sound, resulting in the pressure of the high-pressure gas cylinder being slowly discharged into the atmosphere and wasted. Utility Model Content

[0008] In order to overcome the shortcomings of the background technology, the utility model provides a gas pressure reducing valve with a maximum output pressure limit and instant locking of the adjusted pressure.

[0009] The technical solution of the utility model is: it includes a valve body, which is provided with an air inlet pipe and an air outlet pipe. The valve body is divided into a high-pressure cavity and a low-pressure cavity. The air inlet pipe is connected to the high-pressure cavity, and the air outlet pipe is connected to the low-pressure cavity.

[0010] The valve body is provided with a first through hole between the high-pressure cavity and the low-pressure cavity, a high-pressure spring and a seat are provided in the high-pressure cavity, a first sealing gasket is installed on the seat, and the valve body is provided with a valve seat at the first through hole facing the first sealing gasket, one end of the high-pressure spring is installed on the seat, and the other end of the high-pressure spring is installed on the high-pressure cavity.

[0011] The valve body is provided with a diaphragm and an upper cover above the low-pressure cavity, a pressure-regulating spring is provided above the diaphragm, the outer periphery of the diaphragm is fixed to the valve body, a handwheel is threadedly connected to the upper cover, the bottom of the handwheel is against the top of the pressure-regulating spring and the installation height of the pressure-regulating spring is adjusted when the handwheel is rotated, a ejector pin is provided above the seat, and the ejector pin protrudes from the first through hole when the first sealing gasket contacts the valve seat.

[0012] Preferably, the body of the ejector pin is cylindrical, a raised first boss is provided on the outer diameter of the ejector pin, a first inclined surface is provided on the first boss, and when the ejector pin moves upward in the first through hole, the flow channel area between the first inclined surface and the first through hole decreases.

[0013] Preferably, the ejector pin and the socket are integrally formed.

[0014] Preferably, the seat is provided with a first inverted T-shaped groove facing the valve seat, and the first sealing gasket is installed in the first groove.

[0015] Preferably, the ejector pin and the socket are designed as separate bodies, the bottom of the ejector pin is provided with a first external thread, the top of the socket is provided with a first internal thread, and the first external thread and the first internal thread cooperate with each other.

[0016] Preferably, it also includes a socket nut, the outer periphery of the socket is provided with a second external thread, the socket nut is provided with a second internal thread, and the middle position of the socket nut is provided with a second through hole, and the inner diameter of the second through hole is greater than the outer diameter of the maximum diameter of the ejector pin.

[0017] The second external thread and the second internal thread cooperate with each other, the first sealing gasket is located between the socket and the socket nut, and the socket nut is provided with a first external hexagon, opposite sides or quadrilateral.

[0018] Preferably, a diaphragm rivet made of metal material is riveted in the middle of the diaphragm.

[0019] Preferably, a metal pressure plate is installed between the diaphragm and the pressure-regulating spring, and the diaphragm rivets rivet the diaphragm and the metal pressure plate together.

[0020] Preferably, the diaphragm is made of cloth-reinforced fiber rubber.

[0021] Preferably, the upper cover and the valve body are connected by threads, a diaphragm mounting groove is provided on the valve body, the diaphragm is mounted in the diaphragm mounting groove, and a diaphragm gasket is installed between the upper cover and the diaphragm.

[0022] Preferably, an anti-tamper ring is installed between the valve body and the upper cover, a concave slot is provided on the connection between the valve body and the upper cover, a convex slot is provided below the inner hole of the anti-tamper ring, and the convex slot and the concave slot are engaged with each other.

[0023] A ratchet is provided above the inner hole of the anti-tamper ring, and a ratchet is provided at the threaded connection between the upper cover and the valve body. The ratchet and the ratchet cooperate with each other so that the upper cover can only rotate along the tightening direction of the thread.

[0024] Preferably, one or more cutting grooves are provided on the inner diameter or outer diameter of the anti-tamper ring, and the cutting grooves are V-shaped.

[0025] Preferably, the valve body is threadedly connected to a nozzle at the low-pressure cavity, and the first through hole and the valve seat are both provided on the nozzle.

[0026] Preferably, a boss is provided on the seat, a blind hole is provided at the bottom of the low-pressure cavity of the valve body, one end of the high-pressure spring is installed on the boss, and the other end of the high-pressure spring is installed in the blind hole.

[0027] Preferably, it also includes a pressure-adjusting screw and a locking nut. The top inner hole of the upper cover is provided with a third internal thread, and the outer diameter of the pressure-adjusting screw is provided with a third external thread, and the third internal thread and the third external thread cooperate with each other.

[0028] The inner hole of the locking nut is provided with a fourth internal thread that cooperates with the third external thread, the middle position of the handwheel is provided with a second external hexagon, and the inner hole of the pressure adjusting screw is provided with a second internal hexagon at the end of the third external thread, and the second external hexagon and the second internal hexagon cooperate with each other.

[0029] A first external spline is provided at the outer diameter of the locking nut, and a first internal spline is provided at the inner hole of the handwheel, and the first external spline and the first internal spline match each other.

[0030] Preferably, the handwheel is made of plastic, and a third inner hexagon is provided below the second inner hexagon of the pressure-adjusting screw, which is larger than the opposite side of the second inner hexagon. The handwheel is provided with a third outer hexagon below the second outer hexagon, and the third inner hexagon and the third outer hexagon match each other. The second outer hexagon and the third outer hexagon are provided with slots, and the third outer hexagon is provided with a second inclined surface.

[0031] Preferably, a guide gasket is installed between the pressure-adjusting spring and the pressure-adjusting screw, the guide gasket is V-shaped, the bottom of the pressure-adjusting screw is provided with a sharp corner matching the V-shape of the guide gasket, a plane extends around the outer periphery of the V-shape of the guide gasket, one end of the pressure-adjusting spring is pressed on the plane of the guide gasket; the bottom of the pressure-adjusting screw is provided with a fourth external hexagon.

[0032] Preferably, a second internal spline is provided below the inner hole of the handwheel, and a second external spline is provided above the upper cover, the second internal spline and the second external spline cooperate with each other, and the upper cover is provided with a limiting step and an annular block in sequence below the second external spline, and the handwheel is provided with an elastic hook below the second internal spline, the elastic hook and the annular block are snap-connected to each other, and the limiting step limits the upward movement of the handwheel when in contact with the elastic hook.

[0033] Preferably, the elastic hook is in a 7-shape, the annular block is circular at the bottom and inclined at the top, and the limiting step is flat at the bottom and inclined at the top.

[0034] Preferably, an arc groove is provided on the outer periphery of the handwheel, and a fifth outer hexagon is also provided on the top of the upper cover. A high-pressure pressure gauge, a low-pressure pressure gauge and a safety pressure relief valve are installed on the valve body. The high-pressure pressure gauge is connected to the high-pressure cavity, and the low-pressure pressure gauge is connected to the low-pressure cavity.

[0035] The utility model pioneers an output pressure maximum value limit, which can ensure that when the hand wheel is rotated to adjust the output pressure, it will encounter the maximum value limit and cannot be rotated further, and the hand wheel will not be over-turned to cause the safety valve to open, resulting in back pressure gas leakage, and ultimately leading to back pressure gas leakage and gas leakage in carbonated drinks and beer, causing carbonated drinks and beer to be scrapped and back pressure gas leakage. It can ensure that the output pressure value is always below the opening pressure of the safety valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1-Figure 2 It is an exploded schematic diagram of the present utility model.

[0037] Figure 3 、 Figure 5 、 Figure 7 、 Figure 9 、 Figure 11 It is a schematic structural diagram of different specific embodiments of the present utility model.

[0038] Figure 4 for Figure 3 A partial enlarged view of point A.

[0039] Figure 6 for Figure 5 A partial enlarged view of point B.

[0040] Figure 8 for Figure 7 The part at point C is the larger picture.

[0041] Figure 10 for Figure 9 A partial enlarged view of point D.

[0042] Figure 12 for Figure 11 The detail at point E is the larger picture.

[0043] Figure 13 for Figure 3 A partial enlarged view of point F.

[0044] Figure 14-15 It is a structural schematic diagram of the ejector of the utility model.

[0045] Figure 16-Figure 18 It is a structural diagram of the support seat of the utility model.

[0046] Figures 19-21 It is a structural diagram of the valve body of the utility model.

[0047] Figure 22 This is a schematic structural diagram of the anti-dismantling ring of the utility model.

[0048] Figure 23-25 This is a structural diagram of the pressure-adjusting screw of the utility model.

[0049] Figure 26-Figure 27 It is a structural schematic diagram of the upper cover of the utility model.

[0050] Figure 28 This is a schematic structural diagram of the locking nut of the utility model.

[0051] Figure 29-Figure 31 This is a schematic diagram of the structure of the handwheel of the utility model.

[0052] Figure 32-Figure 33 It is a structural diagram of the present utility model.

[0053] Figure 1-Figure 331. Valve body; 101. High-pressure cavity; 102. Low-pressure cavity; 103. Diaphragm mounting groove; 104. Concave card slot; 105. Blind hole; 2. Outlet pipe; 3. Ball valve; 4. High-pressure pressure gauge; 5. Low-pressure pressure gauge; 6. High-pressure spring; 7. Pressure regulating spring; 8. Inlet pipe; 9. Seat; 901. First internal thread; 902. First groove; 903. Second external thread; 904. 2nd stage; 11, nozzle; 111, first through hole; 1111, flow area; 112, valve seat; 12, first sealing gasket; 13, diaphragm; 14, upper cover; 141, ratchet; 142, third internal thread; 143, second external spline; 144, limit step; 145, annular block; 146, fifth external hexagon; 15, handwheel; 151, second external hexagon; 152, first internal spline Key; 153, third external hexagon; 154, slot; 155, second bevel; 156, second internal spline; 157, elastic hook; 158, arc groove; 16, ejector pin; 161, first boss; 162, first bevel; 163, first external thread; 17, diaphragm rivet; 18, socket nut; 181, second internal thread; 182, second through hole; 183, first external hexagon; 19 , metal pressure plate; 21, diaphragm gasket; 22, anti-tamper ring; 221, concave slot; 222, pawl; 23, pressure-adjusting screw; 231, third external thread; 232, second internal hexagon; 233, third internal hexagon; 234, sharp angle; 235, fourth external hexagon; 24, locking nut; 241, fourth internal thread; 242, first external spline; 25, guide gasket; 26, safety relief valve. DETAILED DESCRIPTION

[0054] The following is a further description of the embodiments of the present invention with reference to the accompanying drawings:

[0055] like Figures 1-33As shown, this embodiment provides a gas pressure reducing valve with a maximum output pressure limit and instant locking of the adjusted pressure, comprising a valve body 1. The valve body 1 is provided with an air inlet pipe 8 and an air outlet pipe 2. The air outlet pipe 2 outputs the required air pressure. The air outlet pipe 2 can also be installed with a ball valve 3. The ball valve 3 is used to facilitate the user to close or open, so that there is no need to adjust the output pressure of the pressure reducing valve to 0 to achieve closing the air outlet pipe 2. Of course, the ball valve 3 can be replaced with other valves such as a butterfly valve and a stop valve, and even a pneumatic or electric ball valve can be used to facilitate the factory's integrated automatic control of the opening and closing of the air outlet pipe 2. The valve body 1 is divided into a high-pressure cavity 101 and a low-pressure cavity 102. The air inlet pipe 8 is connected to the high-pressure cavity 101, and the air outlet pipe 2 is connected to the low-pressure cavity 102. The air inlet pipe 8 is connected to the high-pressure gas cylinder. The air inlet pipe 8 and the high-pressure gas cylinder can be connected by any common connection on the market. Of course, other connection methods can also be used. The gas in the high-pressure gas cylinder enters the high-pressure cavity 101 through the air inlet pipe 8, and then the gas reaches the low-pressure cavity 102 after being reduced in pressure by the pressure reducing mechanism. The air pressure in the low-pressure cavity 102 is the air pressure at which the air outlet pipe 8 finally discharges the gas.

[0056] The valve body 1 is provided with a first through hole 111 between the high-pressure cavity 101 and the low-pressure cavity 102. The ventilation between the high-pressure cavity 101 and the low-pressure cavity 102 passes through the first through hole 111. A high-pressure spring 6 and a seat 9 are provided in the high-pressure cavity 101. A first sealing gasket 12 is installed on the seat 9. The valve body 1 is provided with a valve seat 112 at the first through hole 111 facing the first sealing gasket 12. One end of the high-pressure spring 6 is installed on the seat 9, and the other end of the high-pressure spring 6 is installed on the high-pressure cavity 101. The high-pressure spring 6, the seat 9, the first sealing gasket 12 and the valve seat 112 constitute the above-mentioned pressure reducing mechanism.

[0057] The valve body 1 is provided with a diaphragm 13 and an upper cover 14 above the low-pressure chamber 102. A pressure-regulating spring 7 is provided above the diaphragm 13. The outer periphery of the diaphragm 13 is fixed to the valve body 1. A handwheel 15 is threadedly connected to the upper cover 14. The bottom of the handwheel 15 is against the top of the pressure-regulating spring 7 and the installation height of the pressure-regulating spring 7 is adjusted when the handwheel 15 rotates. A ejector pin 16 is provided above the seat 9. When the first sealing gasket 12 contacts the valve seat 112, the ejector pin 16 protrudes from the first through hole 111.

[0058] Since the diaphragm 13 is not made of metal, it will be deformed downwards by the action of the pressure regulating spring 7, causing the diaphragm 13 to press against the ejector pin 16. The outer periphery of the diaphragm 13 is fixed to the valve body 1, ensuring that the gas in the low-pressure chamber 102 will not leak to the top of the diaphragm 13. Since the output force of the pressure regulating spring 7 is much greater than that of the high-pressure spring 6, it will compress the high-pressure spring 6 to push the ejector pin 16 downwards, thereby moving the seat 9 and the first sealing gasket 12 downwards. The first sealing gasket 12 will separate from the valve seat 112, and the gas in the high-pressure chamber 101 will flow into the low-pressure chamber 102. Formula, since the pressure area of diaphragm 13 is fixed, when the air pressure in low-pressure chamber 102 increases, the effect of gas in low-pressure chamber 102 on diaphragm 13 will increase, thereby compressing pressure-regulating spring 7 and moving diaphragm 13 upward, thereby reducing the force of diaphragm 13 acting on ejector pin 16. When the force of diaphragm 13 acting on ejector pin 16 is balanced with the force of high-pressure spring 6 + high-pressure chamber 101 acting on seat 9, ejector pin 16 is in equilibrium. At this time, as long as the air pressure in low-pressure chamber 102 increases a little bit, seat 9 will move upward, so that first sealing gasket 12 is sealed on valve seat 112, and high-pressure chamber 101 stops supplying gas to low-pressure chamber 102.

[0059] When the outlet pipe 2 is in use, the air pressure in the low-pressure chamber 102 will decrease, and the pressure-regulating spring 7 will cause the diaphragm 13 to move downward to push open the ejector pin 16, and the gas in the high-pressure chamber 101 will enter the low-pressure chamber 102 until the pressure in the low-pressure chamber 102 reaches the set value.

[0060] In order to ensure a more stable air pressure in the low-pressure cavity 102, preferably, the body of the ejector pin 16 is cylindrical, and a raised first boss 161 is provided on the outer diameter of the ejector pin 16. A first inclined surface 162 is provided on the first boss 161. When the ejector pin 16 moves upward in the first through hole 111, a flow area 1111 between the first inclined surface 162 and the first through hole 111 decreases.

[0061] Since the outer diameter of the first boss 161 on the ejector pin 16 is only slightly smaller than the inner diameter of the first through hole 111, when the ejector pin 16 moves upward and approaches the seal, the first inclined surface 162 will rapidly reduce the flow channel area 1111. The flow channel area 1111 refers to the minimum cross-sectional area for gas to flow from the high-pressure cavity 101 to the low-pressure cavity 102. When the flow channel area 1111 is smaller, the gas flow resistance is greater, and the rate of increase of the gas pressure in the low-pressure cavity 102 will slow down. When the low-pressure cavity 102 reaches the set value, the first sealing gasket 12 will be completely sealed.

[0062] like Figure 5-Figure 8 As shown, preferably, the ejector pin 16 and the seat 9 are integrally formed, which helps to reduce parts.

[0063] In order to prevent the first sealing gasket 12 from falling off, Figure 7-10 As shown, preferably, the seat 9 is provided with an inverted T-shaped first groove 902 facing the valve seat 112 , and the first sealing gasket 12 is installed in the first groove 902 .

[0064] To reduce processing costs, the ejector pin 16 and the socket 9 are preferably designed as separate parts. The bottom of the ejector pin 16 is provided with a first external thread 163, and the top of the socket 9 is provided with a first internal thread 901. The first external thread 163 and the first internal thread 901 cooperate with each other. The separate design can save raw materials because one-piece molding requires bar processing.

[0065] In order to prevent the first sealing gasket 12 from falling off, another embodiment is provided, such as Figure 3-Figure 6 As shown, preferably, a socket nut 18 is further included, a second external thread 903 is provided on the outer periphery of the socket 9, a second internal thread 181 is provided inside the socket nut 18, and a second through hole 182 is provided in the middle position of the socket nut 18, and the inner diameter of the second through hole 182 is greater than the outer diameter of the ejector pin 16 at its maximum diameter, so that the socket 9 does not need to be machined with the first groove 902, because the first groove 902 needs to be machined with a groove cutter, which has a slow processing speed and high processing cost.

[0066] In order to facilitate screwing the socket nut 18 onto the socket 9, preferably, the second external thread 903 and the second internal thread 181 cooperate with each other, the first sealing gasket 12 is located between the socket 9 and the socket nut 18, and the socket nut 18 is provided with a first external hexagon 183, an opposite side or a quadrilateral, preferably a first external hexagon 183, so that you have a conventional internal hexagon socket to screw it.

[0067] Since the ejector pin 16 is made of metal, the diaphragm 13 is frequently and directly pressed against the ejector pin 16 for a long time. Since the low-pressure chamber 102 often drops when the gas is used, the diaphragm 13 needs to press the high-pressure spring 6 downward. Over time, the diaphragm 13 is easily broken. Preferably, a diaphragm rivet 17 made of metal material is riveted in the middle of the diaphragm 13. The diaphragm rivet 17 can greatly improve the service life. At the same time, the diaphragm rivet 17 can also be sealed to isolate the gas in the low-pressure chamber 102 from leaking to the pressure-regulating spring 7.

[0068] Since the output force of the pressure regulating spring 7 is relatively large and the contact area with the diaphragm 13 is relatively small, in order to improve the service life of the diaphragm 13, preferably, a metal pressure plate 19 is installed between the diaphragm 13 and the pressure regulating spring 7, and the diaphragm 13 and the metal pressure plate 19 are riveted together by the diaphragm rivets 17.

[0069] Preferably, the diaphragm 13 is made of cloth-fiber rubber. The cloth-fiber rubber has good deformation performance and excellent tensile and compressive properties, which can greatly increase the service life of the diaphragm 13.

[0070] In order to facilitate the installation of the upper cover 14, preferably, the upper cover 14 and the valve body 1 are connected by threads, the valve body 1 is provided with a diaphragm mounting groove 103, the diaphragm 13 is installed in the diaphragm mounting groove 103, and a diaphragm gasket 21 is installed between the upper cover 14 and the diaphragm 13. In this way, when the upper cover 14 is installed, the outer periphery of the diaphragm 13 can be fixed, and at the same time, a good sealing performance can be achieved, and the sealing does not rely solely on the diaphragm 13. When the diaphragm gasket 21 is damaged, the diaphragm gasket 21 can be directly replaced, because the cost of the diaphragm 13 is much more expensive than that of the diaphragm gasket 21.

[0071] In order to prevent users from disassembling, preferably, an anti-dismantling ring 22 is installed between the valve body 1 and the upper cover 14, a concave slot 104 is provided on the connection between the valve body 1 and the upper cover 14, and a convex slot 221 is provided below the inner hole of the anti-dismantling ring 22, and the convex slot 221 and the concave slot 104 are engaged with each other.

[0072] A ratchet 222 is provided above the inner hole of the anti-tamper ring 22. A ratchet 141 is provided at the threaded connection between the upper cover 14 and the valve body 1. The ratchet 222 and ratchet 141 cooperate to ensure that the upper cover 14 can only rotate in the direction in which the threads are tightened. The direction in which the upper cover 14 rotates when tightened onto the valve body 1 is consistent with the direction in which the ratchet 141 is allowed to move by the ratchet 141 as permitted by the ratchet 222.

[0073] When the upper cover 14 is to be removed, the pawl 222 will block the column ratchet 141 to prevent the upper cover 14 from being loosened. Since the anti-tampering ring 22 is made of plastic, the manufacturer can use a tool to forcibly unscrew the upper cover 14 during maintenance. After the maintenance, a new anti-tampering ring 22 can be installed. However, if the user disassembles it violently, the anti-tampering ring 22 will be destroyed.

[0074] Preferably, one or more cutting grooves 223 are provided on the inner diameter or outer diameter of the anti-tamper ring 22, the cutting grooves 223 are V-shaped, and the number of the cutting grooves 223 is preferably 3. In this way, the anti-tamper ring 22 is more easily broken when violently disassembled.

[0075] To facilitate the installation of the high-pressure spring 6, the seat 9, and the first sealing gasket 12 within the valve body 1, as well as the processing of the valve seat 1111, the valve body 1 is preferably threadedly connected to a nozzle 11 at the low-pressure chamber 102, and the first through-hole 111 and the valve seat 112 are both provided on the nozzle 11. The use of a separate body helps reduce production and installation costs, and tightening the threaded connection can provide a seal. Of course, a sealing gasket can also be installed or a sealant can be applied at the connection between the nozzle 11 and the valve body 1. These are conventional technical means for sealing.

[0076] In order to position the high-pressure spring 6 and prevent the high-pressure spring 6 from moving, preferably, a boss 904 is provided on the seat 9, and the valve body 1 is provided with a blind hole 105 at the bottom of the low-pressure cavity 102, one end of the high-pressure spring 6 is installed on the boss 904, and the other end of the high-pressure spring 6 is installed in the blind hole 105.

[0077] Since all pressure reducing valves need to be installed with a safety relief valve, when the pressure in the low-pressure chamber 102 is too high and reaches the opening pressure value of the safety relief valve, the safety relief valve will release the pressure to ensure safety. However, when the user adjusts the pressure reducing valve outlet pressure, the screw is generally turned slowly. When the pressure reducing valve outlet pressure is adjusted too high and slightly exceeds the opening pressure value of the safety relief valve, the safety relief valve will only release a small amount of gas, and the sound of exhaust is difficult for the human ear to hear. It requires applying foam to see it, which will cause the gas in the high-pressure gas cylinder to be slowly released into the atmosphere, causing serious waste. Preferably, it also includes a pressure regulating screw 23 and a locking nut 24. The top inner hole of the upper cover 14 is provided with a third internal thread 142, and the outer diameter of the pressure regulating screw 23 is provided with a third external thread 231. The third internal thread 142 and the third external thread 231 cooperate with each other.

[0078] The inner hole of the locking nut 24 is provided with a fourth internal thread 241 that mates with the third external thread 231. A second external hexagonal socket 151 is provided in the middle of the handwheel 15. The inner hole of the pressure-adjusting screw 23 is provided with a second internal hexagonal socket 232 at the end of the third external thread 231. The second external hexagonal socket 151 mates with the second internal hexagonal socket 232. A first external spline 242 is provided on the outer diameter of the locking nut 24. The inner hole of the handwheel 15 is provided with a first internal spline 152. The first external spline 242 mates with the first internal spline 152.

[0079] The manufacturer sets the maximum pressure value at the pressure reducing valve outlet by simply adjusting the pressure reducing valve outlet pressure to the maximum pressure value, tightening the lock nut 24, and then loosening the handwheel 15. Because the lock nut 24 rotates synchronously with the handwheel 15 via the spline, the highest pressure that can be adjusted by the user via the handwheel 15 is the maximum pressure value. This value is lower than the opening pressure value of the safety relief valve, ensuring that the user does not over-adjust. If the internal pressure of the low-pressure chamber 102 exceeds the opening pressure value of the safety relief valve due to other reasons, the pressure can still be relieved, ensuring safety.

[0080] When the manufacturer sets the maximum pressure value of the pressure reducing valve outlet, an inner hexagonal wrench can be inserted into the second inner hexagonal socket 232 to rotate the pressure regulating screw 23. At the same time, after the handwheel 15 is installed, the handwheel 15 also drives the rotation of the pressure regulating screw 23 through the second outer hexagonal socket 151.

[0081] In order to prevent the handwheel 15 from escaping from the pressure-adjusting screw 23 by itself, preferably, the handwheel 15 is made of plastic, and a third inner hexagon 233 larger than the opposite side of the second inner hexagon 232 is provided below the second inner hexagon 232 of the pressure-adjusting screw 23. The handwheel 15 is provided with a third outer hexagon 153 below the second outer hexagon 151, and the third inner hexagon 233 and the third outer hexagon 153 match each other. The second outer hexagon 151 and the third outer hexagon 153 are provided with slots 154, and the third outer hexagon 153 is provided with a second inclined surface 155.

[0082] When the handwheel 15 is pressed down hard, since the handwheel 15 is made of plastic, under the action of the second inclined surface 155, its third outer hexagon 153 will enter the third inner hexagon 233, thereby getting stuck and preventing the handwheel 15 from being removed from the pressure regulating screw 23.

[0083] In order to better position the pressure-adjusting spring 7 and reduce the maximum outer diameter of the pressure-adjusting screw 23, preferably, a guide gasket 25 is installed between the pressure-adjusting spring 7 and the pressure-adjusting screw 23, and the guide gasket 25 is V-shaped. The bottom of the pressure-adjusting screw 23 is provided with a sharp corner 234 that matches the V-shape of the guide gasket 25. A plane extends around the outer periphery of the V-shape of the guide gasket 25, and one end of the pressure-adjusting spring 7 is pressed on the plane of the guide gasket 25; the bottom of the pressure-adjusting screw 23 is provided with a fourth outer hexagon 235.

[0084] With the addition of a guide washer 25, the outer diameter of the bottom of the pressure regulating spring 7 does not need to be larger than the outer diameter of the pressure regulating spring 7, thereby reducing production costs. At the same time, the V-shape also has a good self-centering function.

[0085] In order to prevent the handwheel 15 from rotating due to vibrations in various places during use of the present utility model, thereby affecting the pressure value of the air outlet pipe 2, preferably, a second internal spline 156 is provided below the inner hole of the handwheel 15, a second external spline 143 is provided above the upper cover 14, the second internal spline 156 and the second external spline 143 cooperate with each other, the upper cover 14 is provided with a limiting step 144 and an annular block 145 in sequence below the second external spline 143, the handwheel 15 is provided with an elastic hook 157 below the second internal spline 156, the elastic hook 157 and the annular block 145 are snap-connected with each other, and when the limiting step 144 contacts the elastic hook 157, the upward movement of the handwheel 15 is restricted.

[0086] When the user does not need to adjust the outlet pressure value of the product of the present invention, the user presses the hand wheel 15 downward with force, and the elastic hook 157 is stuck in the annular block 145, and the second inner spline 156 of the hand wheel is stuck with the second outer spline 143 at the same time, preventing the hand wheel 15 from rotating.

[0087] When the user needs to adjust the outlet pressure value of the product of the utility model, he only needs to pull the handwheel 15 upward with force, and the elastic hook 157 will disengage from the annular block 145, and the elastic hook 157 will be stuck at the limit step 144 to prevent the handwheel 15 from being lifted too far upward. At this time, the second inner spline 156 of the handwheel has been disengaged from the second outer spline 143, and the handwheel 15 can be rotated to adjust the pressure.

[0088] In order to make it easier to engage and disengage the handwheel 15 and to provide a good hand feel, preferably, the elastic hook 157 is in a 7-shape, the annular block 145 is circular at the bottom and inclined at the top, and the limiting step 144 is flat at the bottom and inclined at the top.

[0089] Preferably, an arc groove 158 is provided on the outer periphery of the handwheel 15, and a fifth outer hexagon 146 is also provided on the top of the upper cover 14. A high-pressure pressure gauge 4, a low-pressure pressure gauge 5 and a safety pressure relief valve 26 are installed on the valve body 1. The high-pressure pressure gauge 4 is connected to the high-pressure cavity 101, and the low-pressure pressure gauge 5 is connected to the low-pressure cavity 102.

[0090] The arc groove 158 is close to the size of a human finger, which is convenient for people to twist manually. The high-pressure pressure gauge 4 can see the pressure value at the high-pressure cavity 101, and the low-pressure pressure gauge 5 can directly see the pressure value at the low-pressure cavity 102, which is convenient for operators to operate.

[0091] The specific operation of this utility model product is as follows:

[0092] Insert an Allen wrench into the hexagonal hole of the pressure-adjusting screw 23, rotate the pressure-adjusting screw 23, and adjust the output pressure to the maximum pressure limit. Screw the locking nut 24 until it fits against the rear end face of the upper cover. Insert the handwheel 15, inserting the hexagonal anti-detachment hook of the handwheel 15 into the hexagonal hole of the pressure-adjusting screw 23. Because both the hexagonal holes of the handwheel 15 and the inner hexagonal holes of the pressure-adjusting screw 23 have barbs, they achieve a permanent bond and prevent detachment. As the handwheel 15 is inserted, the small involute internal splines of the handwheel 15 also permanently engage with the involute external splines of the locking nut 24 to prevent detachment. Because the handwheel 15 is synchronously engaged with the pressure-adjusting screw 23 and the locking nut 24, when the front end face of the locking nut 24 fits against the rear end face of the upper cover, it prevents the pressure-adjusting screw 23 from being turned further forward, thus achieving the maximum output pressure limit.

[0093] This utility model patent not only pioneers the maximum output pressure limit, but also enables the pressure regulating hand wheel 15 to be operated manually without tools and the desired output pressure to be accurately and instantly locked.

[0094] The adjustment and locking hook of handwheel 15 is within the "free pressure adjustment travel" of the upper cover, allowing free adjustment at maximum output pressure, from zero to the maximum pressure limit. After adjusting the required pressure, gently push handwheel 15 axially forward so that the adjustment and locking hook passes over the "pressure adjustment and locking protrusion" of the upper cover. Simultaneously, the upper cover's involute external spline engages the large involute internal spline of handwheel 15, achieving instant pressure lock. This instant pressure lock effectively prevents accidental pressure changes caused by accidental touching of handwheel 15, which could result in unexpected quality issues.

[0095] Different from traditional nut locking, this utility model patent locks the instant pressure through the engagement of 48-tooth internal and external splines. It can be completed with one hand without special tools such as wrenches, which is more convenient and quicker. It is also more accurate than the pressure adjustment of traditional nut locking. Due to the clearance of thread fit, the pre-adjusted pressure value will deviate from the final locked pressure value and the pressure value before unlocking under the reaction force of the nut.

[0096] In summary, the meshing of three concentric involute splines, the permanent locking of the hexagonal anti-slip barb, and the pioneering maximum output pressure lock enable instant adjustment and locking of output gas pressure without any additional tools. This not only allows quick, single-handed adjustment of output pressure and locking in the correct pressure, ensuring more precise locking, but also ensures that the maximum output pressure remains below the safety valve opening pressure, ensuring safety, accuracy, and speed while minimizing potential safety hazards and financial losses caused by human error.

[0097] This embodiment should not be regarded as a limitation of the utility model, but any improvement based on the spirit of the utility model should be within the scope of protection of the utility model.

Claims

1. A gas pressure reducing valve with a maximum output pressure limit and instant locking of the regulated pressure, comprising a valve body (1), characterized in that: The valve body (1) is provided with an air inlet pipe (8) and an air outlet pipe (2); the valve body (1) is divided into a high-pressure cavity (101) and a low-pressure cavity (102); the air inlet pipe (8) is connected to the high-pressure cavity (101), and the air outlet pipe (2) is connected to the low-pressure cavity (102); The valve body (1) is provided with a first through hole (111) between the high-pressure cavity (101) and the low-pressure cavity (102); a high-pressure spring (6) and a seat (9) are provided in the high-pressure cavity (101); a first sealing gasket (12) is installed on the seat (9); the valve body (1) is provided with a valve seat (112) at the first through hole (111) facing the first sealing gasket (12); one end of the high-pressure spring (6) is installed on the seat (9), and the other end of the high-pressure spring (6) is installed on the high-pressure cavity (101); The valve body (1) is provided with a diaphragm (13) and an upper cover (14) above the low-pressure chamber (102), a pressure-regulating spring (7) is provided above the diaphragm (13), the outer periphery of the diaphragm (13) is fixed on the valve body (1), a handwheel (15) is threadedly connected to the upper cover (14), the bottom of the handwheel (15) is against the upper part of the pressure-regulating spring (7), and the installation height of the pressure-regulating spring (7) is adjusted when the handwheel (15) rotates, a ejector pin (16) is provided above the seat (9), and the ejector pin (16) protrudes from the first through hole (111) when the first sealing gasket (12) contacts the valve seat (112).

2. A gas pressure reducing valve with output pressure maximum limit and instant locking of regulated pressure according to claim 1, characterized in that: The ejector pin (16) and the seat (9) are designed as separate bodies. The bottom of the ejector pin (16) is provided with a first external thread (163), and the top of the seat (9) is provided with a first internal thread (901). The first external thread (163) and the first internal thread (901) cooperate with each other.

3. A gas pressure reducing valve with output pressure maximum limit and instant locking of regulated pressure according to claim 1, characterized in that: The upper cover (14) and the valve body (1) are connected by threads. A diaphragm mounting groove (103) is provided on the valve body (1), the diaphragm (13) is mounted in the diaphragm mounting groove (103), and a diaphragm gasket (21) is installed between the upper cover (14) and the diaphragm (13).

4. A gas pressure reducing valve with output pressure maximum limit and instant locking of regulated pressure according to claim 1, characterized in that: An anti-disassembly ring (22) is installed between the valve body (1) and the upper cover (14); a concave card slot (104) is provided at the connection between the valve body (1) and the upper cover (14); a convex card slot (221) is provided below the inner hole of the anti-disassembly ring (22); the convex card slot (221) and the concave card slot (104) are engaged with each other; A ratchet (222) is provided above the inner hole of the anti-disassembly ring (22), and a ratchet (141) is provided at the threaded connection between the upper cover (14) and the valve body (1). The ratchet (222) and the ratchet (141) cooperate with each other so that the upper cover (14) can only rotate along the direction of tightening the thread.

5. A gas pressure reducing valve with output pressure maximum limit and instant locking of regulated pressure according to claim 1, characterized in that: The valve body (1) is threadedly connected to a nozzle (11) at the low-pressure cavity (102), and the first through hole (111) and the valve seat (112) are both provided on the nozzle (11).

6. A gas pressure reducing valve with output pressure maximum limit and instant locking of regulated pressure according to claim 1, characterized in that: It also includes a pressure-adjusting screw (23) and a locking nut (24); a third internal thread (142) is provided at the inner hole of the top of the upper cover (14); a third external thread (231) is provided at the outer diameter of the pressure-adjusting screw (23); the third internal thread (142) and the third external thread (231) cooperate with each other; The inner hole of the locking nut (24) is provided with a fourth inner thread (241) that cooperates with the third outer thread (231), the middle position of the hand wheel (15) is provided with a second outer hexagon (151), and the inner hole of the pressure regulating screw (23) at the end of the third outer thread (231) is provided with a second inner hexagon (232), and the second outer hexagon (151) and the second inner hexagon (232) cooperate with each other. A first external spline (242) is provided at the outer diameter of the locking nut (24), and a first internal spline (152) is provided at the inner hole of the hand wheel (15), wherein the first external spline (242) and the first internal spline (152) match each other.

7. A gas pressure reducing valve with output pressure maximum limit and instant locking of regulated pressure according to claim 6, characterized in that: The handwheel (15) is made of plastic, and a third inner hexagon (233) larger than the opposite side of the second inner hexagon (232) is provided below the second inner hexagon (232) of the pressure regulating screw (23). The handwheel (15) is provided with a third outer hexagon (153) below the second outer hexagon (151). The third inner hexagon (233) and the third outer hexagon (153) match each other. The second outer hexagon (151) and the third outer hexagon (153) are provided with slots (154), and the third outer hexagon (153) is provided with a second inclined surface (155) on the outside.

8. A gas pressure reducing valve with maximum output pressure limit and instant locking of regulated pressure according to claim 7, characterized in that: A guide washer (25) is installed between the pressure-regulating spring (7) and the pressure-regulating screw (23). The guide washer (25) is V-shaped. The bottom of the pressure-regulating screw (23) is provided with a sharp corner (234) that matches the V-shape of the guide washer (25). A plane extends around the outer periphery of the V-shape of the guide washer (25). One end of the pressure-regulating spring (7) is pressed on the plane of the guide washer (25); and the bottom of the pressure-regulating screw (23) is provided with a fourth outer hexagon (235).

9. A gas pressure reducing valve with output pressure maximum limit and instant locking of regulated pressure according to claim 7, characterized in that: A second inner spline (156) is provided below the inner hole of the handwheel (15), a second outer spline (143) is provided above the upper cover (14), the second inner spline (156) and the second outer spline (143) cooperate with each other, the upper cover (14) is provided with a limiting step (144) and an annular clamping block (145) in sequence below the second outer spline (143), the handwheel (15) is provided with an elastic hook (157) below the second inner spline (156), the elastic hook (157) and the annular clamping block (145) are snap-connected with each other, and when the limiting step (144) contacts the elastic hook (157), the handwheel (15) is restricted from moving upward.

10. A gas pressure reducing valve with output pressure maximum limit and instant locking of regulated pressure according to claim 9, characterized in that: The elastic hook (157) is in the shape of a figure 7, the annular block (145) is circular at the bottom and inclined at the top, and the limiting step (144) is flat at the bottom and inclined at the top.

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