A flag valve

Abstract

The utility model belongs to valve technical field relates to a kind of mark gas valve, including valve body, the top of valve body is equipped with thread mouth, the bottom and side of valve body are equipped with import and export respectively, the lower of thread mouth is equipped with valve cavity, thread mouth is connected with valve stem by valve stem seat, the top of valve stem is connected with hand wheel, the bottom of thread mouth is connected with valve core seat, the valve core seat is vertically movably connected with valve core, the lower end surface of valve stem is connected with ball bearing, ball bearing is on the upper end surface of valve core, diaphragm is connected between valve core seat and valve cavity, first flow channel and second flow channel for being respectively equipped with the import and export of the valve body in the valve body, valve cavity movably is equipped with valve flap for controlling the opening and closing of first flow channel and second flow channel. The floating amount of valve flap and valve core is adjusted by valve stem, so that stable flow can be obtained.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a standard gas valve. Background Technology

[0002] A standard gas valve is a valve used to control, regulate, or transport standard gases such as calibration gases, high-purity gases, and mixed gases. These valves have high requirements for sealing performance, corrosion resistance, and material compatibility to ensure gas purity and safety. Diaphragm valves are a type of standard gas valve and are commonly used in power plants, chemical plants, and medical and aerospace industries. Existing diaphragm valves mainly use a spring in conjunction with a valve core to achieve flow channel opening and closing. After long-term use, the elasticity of the spring becomes unstable, leading to unstable flow in the valve channel. Regular spring replacement is necessary to ensure valve core stability. Therefore, this invention proposes a standard gas valve. Utility Model Content

[0003] The main objective of this invention is to provide a standard gas valve to solve the problem of unstable flow caused by the unstable elasticity of the internal spring in the diaphragm valve mentioned in the background art.

[0004] This utility model achieves the above-mentioned objective through the following technical solution: a standard gas valve includes a valve body, a threaded port at the top of the valve body, an inlet and an outlet at the bottom and side of the valve body respectively, a valve cavity below the threaded port, a valve stem connected to the threaded port via a valve stem seat, a handwheel connected to the top of the valve stem, a valve core seat connected to the bottom of the threaded port, a valve core vertically and movably connected to the valve core seat, a ball connected to the lower end face of the valve stem, the ball abutting against the upper end face of the valve core, a diaphragm connecting the valve core seat and the valve cavity, a first flow channel and a second flow channel communicating with the inlet and outlet of the valve body respectively, and a valve disc movably disposed within the valve cavity for controlling the opening and closing of the first flow channel and the second flow channel.

[0005] Preferably, the valve core includes a guide portion and a pressure head located at the bottom end of the guide portion. The valve core seat is provided with a guide hole that matches the guide portion. The bottom end of the guide hole is provided with a receiving groove for accommodating the pressure head. The lower end surface of the pressure head is set as an arc surface.

[0006] Preferably, the diaphragm is pressed between the lower end face of the valve core seat and the dividing end face of the threaded port and the valve cavity, and an annular pressure groove is provided on the dividing end face of the threaded port and the valve cavity, and a first sealing pressure block matching the annular pressure groove is provided on the lower end face of the valve core seat.

[0007] Preferably, the first flow channel and the second flow channel are both located at the bottom of the valve cavity, and the outer peripheral surface of the valve disc is provided with a plurality of guide grooves parallel to its axial direction. The valve disc is provided with a gasket mounting hole in the middle, and a gasket is connected in the gasket mounting hole. A through hole is provided at the center of the gasket, and an annular second sealing block coaxial with the through hole is provided on the bottom surface of the valve cavity.

[0008] The beneficial effects of this utility model are as follows: The valve disc is movably disposed within the valve cavity. The position of the valve stem is adjusted by a knob handwheel. When the valve stem is at its lowest position, it abuts against the valve core via a ball bearing. The valve core, through the diaphragm, presses the valve disc against the bottom of the valve cavity, thus closing the gas valve. Rotating the handwheel upwards the valve stem, moving it away from the valve core. This creates a certain amount of vertical movement between the valve core and the valve disc, allowing the high-pressure fluid to open the valve disc and thus open the valve. Compared to existing technologies, the limited floating range of the valve disc and valve core ensures a stable flow rate, eliminates the need for periodic spring replacements, and facilitates long-term use. Attached Figure Description

[0009] Figure 1 This is a diagram showing the arrangement of the standard air valve during operation in an embodiment.

[0010] The numbers in the diagram represent:

[0011] 1. Valve body; 2. Threaded port; 3. Valve cavity; 4. Valve stem; 5. Valve stem seat; 6. Handwheel; 7. Valve core; 8. Valve core seat; 9. Ball bearing; 10. Diaphragm; 11. First flow channel; 12. Second flow channel; 13. Valve disc; 14. Guide section; 15. Pressure head; 16. Guide hole; 17. Receiving groove; 18. First sealing block; 19. Rubber gasket; 20. Second sealing block. Detailed Implementation

[0012] The present invention will be further described in detail below with reference to specific embodiments.

[0013] Example:

[0014] like Figure 1As shown, a standard gas valve of this utility model includes a valve body 1. The top of the valve body 1 is provided with a threaded port 2. The bottom and side of the valve body 1 are respectively provided with an inlet and an outlet. A valve cavity 3 is provided below the threaded port 2. The threaded port 2 is connected to a valve stem 4 through a valve stem seat 5. A handwheel 6 is connected to the top of the valve stem 4. A valve core seat 8 is connected to the bottom of the threaded port 2. A valve core 7 is vertically and movably connected to the valve core seat 8. A ball bearing 9 is connected to the lower end face of the valve stem 4. The ball bearing 9 abuts against the upper end face of the valve core 7. A diaphragm 10 is connected between the valve core seat 8 and the valve cavity 3. A first flow channel 11 and a second flow channel 12 are respectively provided in the valve body 1 to connect the inlet and outlet of the valve body 1. A valve disc 13 for controlling the opening and closing of the first flow channel 11 and the second flow channel 12 is movably provided in the valve cavity 3.

[0015] The valve core 7 includes a guide portion 14 and a pressure head 15 located at the bottom end of the guide portion 14. The valve core seat 8 is provided with a guide hole 16 that matches the guide portion 14. The bottom end of the guide hole 16 is provided with a receiving groove 17 for accommodating the pressure head. The lower end surface of the pressure head is set as an arc surface.

[0016] The diaphragm 10 is pressed between the lower end face of the valve core seat 8 and the dividing end face of the threaded port 2 and the valve cavity 3. An annular pressure groove is provided on the dividing end face of the threaded port 2 and the valve cavity 3. A first sealing block 18 matching the annular pressure groove is provided on the lower end face of the valve core seat 8.

[0017] The first flow channel 11 and the second flow channel 12 are both located at the bottom of the valve cavity 3. The outer circumferential surface of the valve disc 13 is provided with a plurality of guide grooves parallel to its axial direction. The valve disc 13 is provided with a rubber pad mounting hole in the middle. A rubber pad 19 is connected in the rubber pad mounting hole. A through hole is provided at the center of the rubber pad 19. An annular second sealing block 20 coaxial with the through hole is provided on the bottom surface of the valve cavity 3.

[0018] The valve disc 13 is movably disposed within the valve cavity 3. The position of the valve stem 4 is adjusted by the knob handwheel 6. When the valve stem 4 is at its lowest position, it abuts against the valve core 7 via the ball bearing 9. The valve core 7, through the diaphragm 10, presses the valve disc 13 against the bottom of the valve cavity 3, and the standard gas valve is closed. Rotating the handwheel 6 causes the valve stem 4 to move upward, away from the valve core 7. The valve core 7 and the valve disc 13 then have a certain amount of vertical movement space, and the high-pressure fluid forces the valve disc 13 open, thus opening the valve.

[0019] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A standard gas valve, characterized in that: The valve includes a valve body with a threaded opening at its top, an inlet and an outlet at its bottom and side, respectively, and a valve cavity below the threaded opening. A valve stem is connected to the threaded opening via a valve stem seat, a handwheel is connected to the top of the valve stem, and a valve core seat is connected to the bottom of the threaded opening. A valve core is vertically and movably connected to the valve core seat. A ball bearing is connected to the lower end face of the valve stem and rests against the upper end face of the valve core. A diaphragm connects the valve core seat and the valve cavity. The valve body has a first flow channel and a second flow channel that connect the inlet and outlet of the valve body, respectively. A valve disc for controlling the opening and closing of the first and second flow channels is movably disposed within the valve cavity.

2. The standard gas valve according to claim 1, characterized in that: The valve core includes a guide portion and a pressure head located at the bottom end of the guide portion. The valve core seat is provided with a guide hole that matches the guide portion. The bottom end of the guide hole is provided with a receiving groove for accommodating the pressure head. The lower end surface of the pressure head is set as an arc surface.

3. A standard gas valve according to claim 2, characterized in that: The diaphragm is pressed between the lower end face of the valve core seat and the dividing end face of the threaded port and the valve cavity. An annular pressure groove is provided on the dividing end face of the threaded port and the valve cavity. A first sealing pressure block matching the annular pressure groove is provided on the lower end face of the valve core seat.

4. A standard gas valve according to claim 1, characterized in that: The first flow channel and the second flow channel are both located at the bottom of the valve cavity. The outer circumferential surface of the valve disc is provided with a plurality of guide grooves parallel to its axial direction. The valve disc is provided with a rubber pad mounting hole in the middle. A rubber pad is connected in the rubber pad mounting hole. A through hole is provided at the center of the rubber pad. An annular second sealing block coaxial with the through hole is provided on the bottom surface of the valve cavity.

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