Manual sampling combination valve

Abstract

The invention relates to a manual sampling combination valve, which can simultaneously realize the functions of flow regulation and control and pressure relief protection, and is characterized by comprising a valve body (A), a valve head (B), a flow path and a safety bypass pressure control piece (C), wherein the valve head is mounted on one side of the main valve body (1) of the valve body so as to control opening and closing of a medium and regulate and control the flow of the medium; the safety bypass pressure control part is fixed on the other side, opposite to the valve head mounting side, of the main valve body of the valve body so as to play a role in safety protection in equipment; a flow regulation and control cavity and a safe pressure regulation and control cavity are formed in the two sides in the valve body respectively, are not penetrated and are isolated through an interlayer; the flow path comprises two medium flow channels; the manual sampling combination valve further comprises a fastening fixing piece, a sealing piece and a clamping sleeve connector (17). The valve head comprises a handle (13), a clamping spring (14), a pull rod (15) and a flow adjusting ejector pin (10).

Description

Technical Field

[0001] The invention belongs to the technical field of precision valves, and in particular relates to a manual sampling combination valve capable of adjusting flow and providing pressure relief protection. Background Art

[0002] In the existing sampling system, two accessories, manual sampling valve and safety valve, are used for flow control and overpressure protection to meet the functional requirements of the system.

[0003] (1) The manual sampling valve is a device used in the online continuous monitoring of instruments to determine the accuracy of the monitored online instruments. Its function and role is to adjust the manual sampling flow and control the pressure of the pipeline. The normal control flow range is 500-800 ml per minute, and the pressure range is 0-2 kg. It is also used for comparison and calibration of laboratory instruments and online instruments. It is set at the sampling point where the laboratory instrument is measured for manual sampling. The sample water for manual sampling and the sample water measured by the online instrument are both continuously flowing sample water. The real-time monitoring is the water quality of the boiler represented by the sample water.

[0004] (2) Under normal circumstances, the equipment safety pressure is controlled between 0.6-0.8 MPa, and the assistance of the safety valve is required at this time. The safety valve is used in the equipment to achieve the safety protection of the sample water to the instrument and accessories. When the equipment pressure exceeds the specified value, the safety valve will open and discharge part of the sample water directly into the system, so that the online instrument and accessories can operate normally.

[0005] Manual sampling valve and safety valve are used for flow control and overpressure protection. The number of corresponding accessories is large, resulting in high production labor costs and large space occupied by the installation equipment.

[0006] Therefore, there is a technical demand for organically combining a manual sampling valve and a safety valve to form a combined valve body, so as to simultaneously achieve flow regulation and pressure relief protection. Summary of the invention

[0007] The purpose of the present invention is to provide a manual sampling combination valve with adjustable flow and pressure relief protection. The manual sampling valve and the safety valve are redesigned on the same valve body, so that the flow control function of the manual sampling valve and the pressure relief protection function of the safety valve are combined together, thereby integrating the two functions of flow regulation and pressure relief protection into one, reducing the number of required accessories, and greatly reducing the high labor cost of production and the space occupied by installation equipment.

[0008] The present invention provides a manual sampling combination valve, which can simultaneously realize the functions of flow control and pressure relief protection, and is characterized in that it includes: a valve body (A), a valve head (B), a flow path and a safety bypass pressure control unit (C); wherein: The valve head (B) is installed on one side of the valve body (1) of the valve body (A) to control the opening and closing of the medium and regulate the flow of the medium; the safety bypass pressure control unit (C) is fixed on the other side of the valve body (1) of the valve body (A) opposite to the installation side of the valve head (B) to play a safety protection role in the equipment; A flow control cavity and a safety pressure control cavity are respectively arranged on both sides of the valve body (A), and the flow control cavity and the safety pressure control cavity are not penetrated and are isolated by a partition; The flow path includes two medium flow channels, which are formed by arranging two circular holes on both sides of the partition layer as the two medium flow channels, and the two medium flow channels are respectively a flow channel on the partition layer on the safety pressure regulating cavity side and a flow channel on the partition layer on the flow regulating cavity side; The manual sampling combination valve also includes a fastening fixture, a sealing member and a ferrule joint (17); wherein the fastening fixture includes a first fastening nut (4) and a second fastening nut (12) which are symmetrically arranged on the left and right; wherein the sealing member includes a first polytetrafluoroethylene pad (2) and a second polytetrafluoroethylene pad (16) which are symmetrically arranged on the left and right, and a first O-ring (5) and a second O-ring (11); wherein the ferrule joint (17) is threadedly connected to the left and right sides of the valve body (1); and wherein the first O-ring (5) is arranged in the safety bypass pressure control unit (C).

[0009] Preferably, the valve body (A) further includes a water inlet channel and a water outlet channel; the distance between the water inlet channel of the valve body (A) and the flow channel on the partition on the safety pressure regulating cavity side is 3 mm; the distance between the water outlet channel of the valve body (A) and the water inlet channel and the flow channel on the partition on the safety pressure regulating cavity side is 4 mm.

[0010] Preferably, two threaded holes are provided on both sides of the middle section of the outer circumferential surface of the valve body (A), and a planar circular groove coaxial with the threaded holes is provided.

[0011] Preferably, threaded steps with a slightly smaller diameter are provided on the outer sides of both ends of the valve body (A), and the valve body (A) is threadedly connected to the valve head (B) and the safety bypass pressure control unit (C) through the threaded steps.

[0012] Preferably, the valve head (B) comprises a handle (13), a retaining spring (14), a pull rod (15) and a flow regulating ejector pin (10); wherein: A small annular groove is provided at one end of the pull rod (15), and the small annular groove fixes the pull rod (15) to the handle (13) through the retaining ring (14); a large annular groove is provided at the other end of the pull rod (15), and one end of the pull rod (15) provided with the large annular groove is clamped on the retaining groove of the flow regulating ejector pin (10); The handle (13) is fixed on the valve body (A); The flow regulating ejector pin (10) moves up and down in the flow regulating cavity of the valve body (A) driven by the pull rod (15) and the retaining spring (14) as the handle (13) rotates, thereby changing the contact area between the reducing cone tip of the flow regulating ejector pin (10) and the valve body (A), thereby changing the size of the sample water flow; The second O-ring (11) is sleeved in the annular groove of the flow regulating ejector pin (10); the outer diameter of the second O-ring (11) is larger than the inner diameter of the flow regulating cavity, and a sealing effect is formed when the flow regulating ejector pin (10) moves up and down.

[0013] Preferably, the flow regulating ejector pin (10) is placed in the flow regulating cavity, a detachable connecting rod hook and a slot are provided at the upper end of the flow regulating ejector pin (10), an annular slot is provided at the middle end, and a conical slot is provided at the lower end, the bottom of the conical slot is a plane, and a variable diameter cone tip is provided at the center of the conical slot; the flow regulating ejector pin (10) is connected to the pull rod (15) by means of the detachable connecting rod hook and the slot provided at its upper end, and is indirectly connected to the handle (13).

[0014] Preferably, the safety bypass pressure control unit (C) comprises a safety pressure sealing ejector pin (9), a safety pressure sealing ejector pin support (8), a spring (7), a fixing cap (3) and a safety pressure adjustment rotating rod (6); wherein: The fixing cap (3) is fixed on the valve body (1) and is sealed on the outside of the first polytetrafluoroethylene pad (2) and the second polytetrafluoroethylene pad (16); The safety pressure sealing ejector pin (9) is clamped in the safety pressure sealing ejector pin holder (8); one side of the safety pressure sealing ejector pin (9) is conical, and the other side opposite to it is cylindrical, and the contact surface radii of the safety pressure sealing ejector pin (9) are equal; A coaxial boss is provided on one side of the safety pressure sealing ejector pin holder (8), and a coaxial circular groove that does not penetrate is provided on the plane of the boss; A circular groove is provided on one side of the safety pressure adjustment rotating rod (6), and a hexagonal groove is provided on the other side opposite thereto; a circular boss is provided in the middle of the safety pressure adjustment rotating rod (6), and an annular groove is provided in the middle of the circular boss; The spring (7) is placed in a groove between the safety pressure sealing ejector pin holder (8) and the safety pressure adjustment rotating rod (6); The safety pressure sealing ejector pin (9), the safety pressure sealing ejector pin support (8), the spring (7), and the safety pressure adjustment rotating rod (6) are sequentially placed in the safety pressure regulating cavity of the valve body (A).

[0015] Preferably, the first O-ring (5) is sleeved in the annular groove of the safety pressure adjustment rotating rod (6).

[0016] Preferably, a thread is provided on the outer side of the safety pressure adjustment rotating rod (6) and is connected to the spring (7) via the thread, so that the pressure of the spring (7) can be changed by using the safety pressure adjustment rotating rod (6), thereby controlling different safety pressure relief pressures in the safety pressure regulating cavity.

[0017] Preferably, the interior of the fixing cap (3) is provided with a cavity with a non-full-segment thread and connected to a through hole, and the exterior of the fixing cap (3) is a step with a full-segment thread.

[0018] The manual sampling combination valve of the present invention has the following beneficial effects: (1) There are two cavities on both sides of the valve body, one for flow control and the other for safety pressure control. In addition to opening or controlling the flow rate, the manual sampling combination valve also has a pressure relief protection function, so that the combination valve has both flow control and pressure relief protection functions.

[0019] (2) A safety pressure sealing ejector with a cone head is used at the pressure relief protection part, so that the safety pressure sealing ejector can dock with the axis of the channel during sealing, and the sealing effect is better.

[0020] (3) There is a conical groove at the lower end of the flow regulating ejector pin, which can stabilize the sample water pressure so that the medium flowing through the flow regulating ejector pin can be stably regulated, ensuring that the medium flows smoothly through the valve body; the flow regulating ejector pin is connected to the pull rod through the groove at its upper end and is indirectly connected to the handle. The groove design facilitates the disassembly and assembly of the handle and the pull rod.

[0021] (4) A component for adding a pressure relief protection function mechanism includes: a safety pressure adjustment rotating rod with a thread, which is used to change the spring pressure of the pressure relief chamber to control different safety pressure relief pressures.

[0022] (5) In the soda sampling device, the manual sampling flow rate and the discharge pressure can be precisely controlled to ensure the safe use of instruments and accessories. The needle tip length can be lengthened to more accurately control the sample water flow rate. It also has a pressure relief protection function, and the safety relief pressure can be adjusted at will within a controllable range. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related technologies, the drawings required for use in the specific embodiments or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a three-dimensional structural schematic diagram of the manual sampling combination valve of the present invention; Figure 2 It is a front view of the manual sampling combination valve of the present invention; Figure 3 for Figure 2 BB cross-sectional view; Figure 4 It is a schematic diagram of the medium flow direction when the manual sampling combination valve of the present invention does not exceed the system safety pressure; Figure 5 It is a schematic diagram of the medium flow direction of the manual sampling combination valve of the present invention under the condition of exceeding the system safety pressure. Reference numerals:

[0025] 1. Valve body, 2. First PTFE gasket, 3. Fixed cap, 4. First fastening nut, 5. First O-ring; 6. Safety pressure adjustment rotating rod, 7. Spring, 8. Safety pressure sealing ejector pin holder, 9. Safety pressure sealing ejector pin; 10. flow regulating ejector pin, 11. second O-ring, 12. second fastening nut, 13. handle, 14. retaining ring; 15. Pull rod, 16. Second PTFE pad, 17. Compression fitting. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are 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, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] like Figure 1-4 As shown, the first aspect of the present invention is to provide a manual sampling combination valve, which can simultaneously realize the functions of flow control and pressure relief protection, including: a valve body A, a valve head (B), a flow path and a safety bypass pressure control unit C; wherein: The valve head B is installed on one side of the valve body 1 of the valve body A to control the opening and closing of the medium and regulate the flow of the medium; the safety bypass pressure control unit C is fixed on the other side of the valve body 1 of the valve body A opposite to the installation side of the valve head B to play a safety protection role in the equipment; A flow control cavity and a safety pressure control cavity are respectively arranged on both sides of the valve body A, and the flow control cavity and the safety pressure control cavity are not penetrated and isolated by a partition; The flow path includes two medium flow channels, which are formed by arranging two circular holes on both sides of the partition layer as the two medium flow channels. The two medium flow channels are respectively a flow channel on the partition layer on the safety pressure regulating cavity side and a flow channel on the partition layer on the flow regulating cavity side.

[0030] As a preferred embodiment, the valve body A also includes an inlet channel and an outlet channel; in order to ensure sampling flow control and safe pressure relief, the distance between the inlet channel of the valve body A and the flow channel on the partition on the side of the safety pressure regulation cavity is 3 mm; the distance between the outlet channel of the valve body A and the inlet channel and the flow channel on the partition on the side of the safety pressure regulation cavity is 4 mm; when the system pressure reaches a dangerous pressure, the pressure can be quickly relieved.

[0031] As a preferred embodiment, two threaded holes are provided on both sides of the middle section of the outer circumferential surface of the valve body A, and a planar circular groove coaxial with the threaded holes is provided.

[0032] As a preferred embodiment, threaded steps with a slightly smaller diameter are provided on the outer sides of both ends of the valve body A, and the valve body A is threadedly connected to the valve head (B) and the safety bypass pressure control unit C through the threaded steps.

[0033] As a preferred embodiment, the manual sampling combination valve also includes a fastening fixture, a sealing component and a ferrule joint 17; wherein the fastening fixture includes a first fastening nut 4 and a second fastening nut 12 symmetrically arranged on the left and right; the sealing component includes a first polytetrafluoroethylene pad 2 and a second polytetrafluoroethylene pad 16 symmetrically arranged on the left and right and a first O-ring 5 and a second O-ring 11; the ferrule joint 17 is threadedly connected to the left and right sides of the valve body 1; the first O-ring 5 is arranged in the safety bypass pressure control unit C.

[0034] like Figure 3-5 As shown, as a preferred embodiment, the valve head B includes a handle 13, a retaining spring 14, a pull rod 15 and a flow regulating ejector pin 10; wherein: A small annular groove is provided at one end of the pull rod 15, and the small annular groove fixes the pull rod 15 on the handle 13 through the clamping ring 14; a large annular groove is provided at the other end of the pull rod 15, and one end of the pull rod 15 provided with the large annular groove is clamped on the clamping groove of the flow regulating ejector pin 10; The handle 13 is fixed on the valve body A; The flow regulating ejector pin 10 is placed in the flow regulating cavity, the upper end of the flow regulating ejector pin 10 is provided with a detachable connecting rod hook and a card slot, the middle end is provided with an annular slot, and the lower end is provided with a conical slot, the bottom of the conical slot is a plane, and a variable diameter cone tip is provided at the center of the conical slot; by providing a conical slot at the lower end of the flow regulating ejector pin 10, the sample water pressure can be stabilized, so that the medium flowing through the flow regulating ejector pin 10 can be stably regulated, and the medium can be ensured to flow smoothly through the valve body A; the flow regulating ejector pin 10 is connected to the pull rod 15 by using the detachable connecting rod hook and the card slot provided at its upper end, and is indirectly connected to the handle 13, and the design of the card slot and the hook facilitates the disassembly and assembly of the handle 13 and the pull rod 15; The flow regulating ejector pin 10 moves up and down in the flow regulating cavity of the valve body A driven by the pull rod 15 and the retaining spring 14 as the handle 13 rotates, thereby changing the contact area between the reducing cone tip of the flow regulating ejector pin 10 and the valve body A, thereby changing the size of the sample water flow. In this embodiment, the larger the contact area, the smaller the flow, and after a certain degree, the medium stops flowing; the smaller the contact area, the larger the flow, and after a certain degree, the sample water flow size no longer changes; The second O-ring 11 is sleeved in the annular groove of the flow regulating ejector pin 10 ; because the outer diameter of the second O-ring 11 is larger than the inner diameter of the flow regulating cavity, a sealing effect is formed when the flow regulating ejector pin 10 moves up and down.

[0035] As a preferred embodiment, the safety bypass pressure control unit C includes a safety pressure sealing ejector pin 9, a safety pressure sealing ejector pin support 8, a spring 7, a fixing cap 3 and a safety pressure adjustment rotating rod 6; wherein: The fixing cap 3 is fixed on the valve body 1 and is sealed on the outside of the first PTFE pad 2 and the second PTFE pad 16; The safety pressure sealing ejector pin 9 is clamped in the safety pressure sealing ejector pin holder 8; one side of the safety pressure sealing ejector pin 9 is conical, and the other side opposite to it is cylindrical, and the contact surface radii of the safety pressure sealing ejector pin 9 are equal; A coaxial boss is provided on one side of the safety pressure sealing ejector pin holder 8, and a coaxial circular groove which does not penetrate is provided on the plane of the boss; A circular groove is provided on one side of the safety pressure adjustment rotating rod 6, and a hexagonal groove is provided on the other side opposite thereto. A circular boss is provided in the middle of the safety pressure adjustment rotating rod 6, and an annular groove is provided in the middle of the circular boss. The spring 7 is placed in the groove of the safety pressure sealing ejector pin holder 8 and the safety pressure adjustment rotating rod 6; The safety pressure sealing ejector pin 9 , the safety pressure sealing ejector pin support 8 , the spring 7 , and the safety pressure adjustment rotating rod 6 are sequentially placed in the safety pressure regulating cavity of the valve body A.

[0036] As a preferred embodiment, the first O-ring 5 is sleeved in the annular groove of the safety pressure adjustment rotating rod 6 .

[0037] As a preferred embodiment, a thread is provided on the outer side of the safety pressure adjustment rotating rod 6, which is connected to the spring 7 via the thread, so that the pressure of the spring 7 can be changed by using the safety pressure adjustment rotating rod 6, thereby controlling different safety pressure relief pressures in the safety pressure regulating cavity.

[0038] As a preferred embodiment, the interior of the fixing cap 3 is provided with a cavity with a non-full-segment thread and connected with a through hole, and the outer side of the fixing cap 3 is a step with a full-segment thread.

[0039] Working principle: like Figure 4 As shown in the figure, when the system pressure is lower than the safety pressure, the medium is not enough to push open the safety pressure sealing ejector pin 9, and the medium is pressed Figure 4 The flow direction is out of the valve body. Figure 5As shown in the figure, when the system pressure exceeds the safety pressure, the medium pushes open the safety pressure sealing ejector pin 9 under the action of the system pressure, and the medium presses Figure 5 The flow direction is out of the high-pressure pipeline, and the system pressure drops.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A manual sampling combination valve, which can simultaneously realize the functions of flow control and pressure relief protection, characterized in that: include: Valve body (A), valve head (B), flow path and safety bypass pressure control (C); of which: The valve head (B) is installed on one side of the valve body (1) of the valve body (A) to control the opening and closing of the medium and regulate the flow of the medium; the safety bypass pressure control unit (C) is fixed on the other side of the valve body (1) of the valve body (A) opposite to the installation side of the valve head (B) to play a safety protection role in the equipment; A flow control cavity and a safety pressure control cavity are respectively arranged on both sides of the valve body (A), and the flow control cavity and the safety pressure control cavity are not penetrated and are isolated by a partition; The flow path includes two medium flow channels, which are formed by arranging two circular holes on both sides of the partition layer as the two medium flow channels, and the two medium flow channels are respectively a flow channel on the partition layer on the safety pressure regulating cavity side and a flow channel on the partition layer on the flow regulating cavity side; The manual sampling combination valve also includes a fastening fixture, a sealing member and a ferrule joint (17); wherein the fastening fixture includes a first fastening nut (4) and a second fastening nut (12) which are symmetrically arranged on the left and right; wherein the sealing member includes a first polytetrafluoroethylene pad (2) and a second polytetrafluoroethylene pad (16) which are symmetrically arranged on the left and right, and a first O-ring (5) and a second O-ring (11); wherein the ferrule joint (17) is threadedly connected to the left and right sides of the valve body (1); and wherein the first O-ring (5) is arranged in the safety bypass pressure control unit (C).

2. A manual sampling combination valve according to claim 1, characterized in that: The valve body (A) also includes an inlet channel and an outlet channel; the distance between the inlet channel of the valve body (A) and the flow channel on the partition on the safety pressure regulation cavity side is 3 mm; the distance between the outlet channel of the valve body (A) and the inlet channel and the flow channel on the partition on the safety pressure regulation cavity side is 4 mm.

3. A manual sampling combination valve according to claim 2, characterized in that: Two threaded holes are provided on both sides of the middle section of the outer circumferential surface of the valve body (A), and a planar circular groove coaxial with the threaded holes is provided.

4. A manual sampling combination valve according to claim 3, characterized in that: Threaded steps with a slightly smaller diameter are provided on the outer sides of both ends of the valve body (A), and the valve body (A) is threadedly connected to the valve head (B) and the safety bypass pressure control unit (C) through the threaded steps.

5. A manual sampling combination valve according to claim 4, characterized in that: The valve head (B) comprises a handle (13), a retaining spring (14), a pull rod (15) and a flow regulating ejector pin (10); wherein: A small annular groove is provided at one end of the pull rod (15), and the small annular groove fixes the pull rod (15) to the handle (13) through the retaining ring (14); a large annular groove is provided at the other end of the pull rod (15), and one end of the pull rod (15) provided with the large annular groove is clamped on the retaining groove of the flow regulating ejector pin (10); The handle (13) is fixed on the valve body (A); The flow regulating ejector pin (10) moves up and down in the flow regulating cavity of the valve body (A) driven by the pull rod (15) and the retaining spring (14) as the handle (13) rotates, thereby changing the contact area between the reducing cone tip of the flow regulating ejector pin (10) and the valve body (A), thereby changing the size of the sample water flow; The second O-ring (11) is sleeved in the annular groove of the flow regulating ejector pin (10); the outer diameter of the second O-ring (11) is larger than the inner diameter of the flow regulating cavity, and a sealing effect is formed when the flow regulating ejector pin (10) moves up and down.

6. A manual sampling combination valve according to claim 5, characterized in that: The flow regulating ejector pin (10) is placed in the flow regulating cavity. A detachable connecting rod hook and a slot are provided at the upper end of the flow regulating ejector pin (10), an annular slot is provided at the middle end, and a conical slot is provided at the lower end. The bottom of the conical slot is a plane, and a variable diameter cone tip is provided at the center of the conical slot. The flow regulating ejector pin (10) is connected to the pull rod (15) by means of the detachable connecting rod hook and the slot provided at the upper end thereof, and is indirectly connected to the handle (13).

7. A manual sampling combination valve according to claim 6, characterized in that: The safety bypass pressure control unit (C) comprises a safety pressure sealing ejector pin (9), a safety pressure sealing ejector pin support (8), a spring (7), a fixing cap (3) and a safety pressure adjustment rotating rod (6); wherein: The fixing cap (3) is fixed on the valve body (1) and is sealed on the outside of the first polytetrafluoroethylene pad (2) and the second polytetrafluoroethylene pad (16); The safety pressure sealing ejector pin (9) is clamped in the safety pressure sealing ejector pin holder (8); one side of the safety pressure sealing ejector pin (9) is conical, and the other side opposite to it is cylindrical, and the contact surface radii of the safety pressure sealing ejector pin (9) are equal; A coaxial boss is provided on one side of the safety pressure sealing ejector pin holder (8), and a coaxial circular groove that does not penetrate is provided on the plane of the boss; A circular groove is provided on one side of the safety pressure adjustment rotating rod (6), and a hexagonal groove is provided on the other side opposite thereto; a circular boss is provided in the middle of the safety pressure adjustment rotating rod (6), and an annular groove is provided in the middle of the circular boss; The spring (7) is placed in a groove between the safety pressure sealing ejector pin holder (8) and the safety pressure adjustment rotating rod (6); The safety pressure sealing ejector pin (9), the safety pressure sealing ejector pin support (8), the spring (7), and the safety pressure adjustment rotating rod (6) are sequentially placed in the safety pressure regulating cavity of the valve body (A).

8. A manual sampling combination valve according to claim 7, characterized in that: The first O-ring (5) is sleeved in the annular groove of the safety pressure adjustment rotating rod (6).

9. A manual sampling combination valve according to claim 8, characterized in that: The safety pressure adjustment rotating rod (6) is provided with a thread on its outer side and is connected to the spring (7) via the thread, so that the pressure of the spring (7) can be changed by using the safety pressure adjustment rotating rod (6), thereby controlling different safety pressure relief pressures in the safety pressure regulating cavity.

10. A manual sampling combination valve according to claim 9, characterized in that: The interior of the fixing cap (3) is provided with a cavity with a non-full-segment thread and is connected to a through hole, and the exterior of the fixing cap (3) is a step with a full-segment thread.

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