CN110617333A

CN110617333A - High-pressure stop valve for gaseous media

Info

Publication number: CN110617333A
Application number: CN201910835155.XA
Authority: CN
Inventors: 周卫东; 刘小念; 胡强; 李伟; 李坪; 崔禹海
Original assignee: SICHUAN JIANYANG CHUANLI MACHINERY MANUFACTURING Co Ltd
Current assignee: SICHUAN JIANYANG CHUANLI MACHINERY MANUFACTURING Co Ltd
Priority date: 2019-09-05
Filing date: 2019-09-05
Publication date: 2019-12-27

Abstract

The invention discloses a high-pressure stop valve for a gas medium, which comprises a valve body, an actuating mechanism, a valve seat, a valve rod and a sealing assembly A, wherein a valve cavity comprises a flow channel, two ends of the flow channel are respectively provided with a gas inlet and a gas outlet, and the gas inlet is positioned on one side of the gas outlet close to the actuating mechanism; the valve seat is annular, the outer annular surface of the valve seat is connected with the flow channel wall, the inner annular surface of the valve seat is provided with a sealing ring, the valve rod is a two-stage stepped shaft, the large-diameter end of the valve rod is connected with the driving end of the actuating mechanism, the small-diameter end of the valve rod is inserted into the valve body, and a sealing part is arranged between the large-diameter shaft and the small-diameter shaft of the valve rod. In the whole process that high-pressure fluid flows through the valve body, because the fluid only contacts with the side wall of the valve rod, thrust cannot be generated at any part of the cross section of the projection surface of the valve rod, and then the pressure fluid cannot generate jacking force on the valve rod, so that the connecting part between the valve rod at the axial fixed position and the actuating mechanism cannot be damaged, and the service life of the valve is prolonged.

Description

High-pressure stop valve for gaseous media

Technical Field

The invention relates to the technical field of stop valves, in particular to a high-pressure stop valve for a gas medium.

Background

The stop valve, also called stop valve, is the most widely used valve, and it is popular because the friction between the sealing surfaces is small in the opening and closing process, it is durable, the opening height is not large, it is easy to manufacture, it is convenient to maintain, it is not only suitable for middle and low pressure, but also suitable for high pressure. The closing principle of the stop valve is that the sealing surface of the valve clack is tightly attached to the sealing surface of the valve seat by means of the pressure of the valve rod, and the medium is prevented from flowing. The stop valve is an extremely important cut-off valve, the sealing of the stop valve is realized by applying torque to a valve rod, and the valve rod applies pressure to a valve clack in the axial direction, so that a sealing surface of the valve clack is tightly attached to a sealing surface of a valve seat, and the leakage of a medium along a gap between the sealing surfaces is prevented.

In the existing stop valve, the axes of the air inlet and the air outlet are parallel and perpendicular to the moving direction of the valve rod, so that high-pressure fluid firstly enters the air inlet, then moves upwards for a certain distance, contacts with a valve core and a valve seat and then enters the air outlet in the process of opening the valve. When the valve cavity with the structure works, high-pressure fluid can generate upward thrust on a valve core of the stop valve, when the valve is in a passage, the valve rod is axially fixed by the actuating mechanism, and the upward thrust of the high-pressure fluid on the valve core can damage a connecting part between the valve rod and the actuating mechanism, so that the service life of the valve is negatively influenced.

Disclosure of Invention

The invention aims to: the high-pressure stop valve for the gas medium solves the problem that in the existing stop valve, the upward thrust of high-pressure fluid to a valve core can damage the connecting part between a valve rod and an actuating mechanism, and the service life of the valve is negatively influenced.

The technical scheme adopted by the invention is as follows:

the high-pressure stop valve for the gas medium comprises a valve body, an actuating mechanism fixed on the valve body, a valve seat positioned in a valve cavity of the valve body, a valve rod with one end connected with the actuating mechanism and the other end inserted into the valve cavity and capable of being in sealing fit with the valve seat, and a sealing assembly A for sealing the fit part between the valve rod and the valve body, wherein the valve cavity comprises a flow channel with the axis coincident with the axis of the valve rod, the two ends of the flow channel are respectively provided with a gas inlet and a gas outlet, and the gas inlet is positioned on one side of; the valve seat is annular, the outer annular surface of the valve seat is connected with the wall of the flow channel, the inner annular surface of the valve seat is provided with a sealing ring, the valve rod is a two-stage stepped shaft, the large-diameter end of the valve rod is connected with the driving end of the actuating mechanism, the small-diameter end of the valve rod is inserted into the valve body, a sealing part is arranged between the large-diameter shaft and the small-diameter shaft of the valve rod, the flow channel is cut off when the sealing part is matched with the sealing ring, and when the small-diameter shaft is opposite to the.

Furthermore, an annular groove with the axis coincident with the axis of the valve rod is arranged inside the valve body, the valve body comprises an upper valve body and a lower valve body which are sequentially connected, the air inlet, the upper side of the flow channel and the upper side of the annular groove are positioned on the upper valve body, and the air outlet, the lower side of the flow channel and the lower side of the annular groove are positioned on the lower valve body;

the outer ring surface of the valve seat protrudes outwards to form a fixing ring matched with the annular groove;

the actuating mechanism is fixed on the upper valve body.

Further, the inner diameter of the valve seat is synchronously increased from the contact surface between the upper valve body and the lower valve body to the upper side and the lower side.

Furthermore, the valve seat is divided into an upper valve seat and a lower valve seat by a contact surface between the valve body and the lower valve body, an annular right-angle groove is arranged on the surface of the upper valve seat opposite to the lower valve seat, the part of the lower valve seat opposite to the right-angle groove protrudes outwards to form a ring body with a right-angle triangle cross section, the surface of one right-angle side of the ring body is connected with the lower valve seat, the surface of the other right-angle side of the ring body is the inner ring surface of the ring body, and the bevel edge of the ring body is in a step shape;

the cross-section of the sealing ring is in a right trapezoid shape, the lower bottom and the surface where the right-angle waist is located are respectively contacted with two groove walls of the right-angle groove, the oblique-angle waist is in a step shape and matched with the oblique edge of the ring body, the right angle between the upper bottom and the right-angle waist is contacted with the sealing part, and the sealing part and the sealing ring are in linear sealing.

Further, the small diameter end of the valve rod is provided with a guide rod, the axis of the guide rod coincides with the axis of the valve rod, one end of the guide rod is connected with the valve rod, the other end of the guide rod penetrates out of the valve body, and the guide rod is in sealing fit with the valve body through a sealing component B.

Furthermore, a sealing cover is connected to the part, penetrated out by the guide rod, of the valve body, and the sealing cover covers the guide rod.

Further, actuating mechanism passes through coupling assembling to be fixed on the valve body, coupling assembling includes a support section of thick bamboo, screw B and connecting plate, the connecting plate is fixed on the valve body, the one end and the connecting plate of a support section of thick bamboo are connected, and its other end and actuating mechanism's shell contact, screw B's pole portion end passes behind the centre bore of connecting plate, a support section of thick bamboo in proper order and is connected with actuating mechanism's shell threaded connection.

Furthermore, the actuating mechanism is a single-acting cylinder, and the large-diameter end of the valve rod is connected with the tail end of a piston rod of the single-acting cylinder.

Due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. when the valve is opened, the valve rod is moved upwards through the actuating mechanism, so that the small-diameter shaft and the sealing ring are in the same axial position, and the flow channel is in a passage state; then the high-pressure fluid at the air inlet enters the air outlet along the flow channel; in the whole process that high-pressure fluid flows through the valve body, the fluid only contacts with the side wall of the valve rod, thrust cannot be generated on any part of the cross section of the projection surface of the valve rod, and then the pressure fluid cannot generate jacking force on the valve rod, so that the connecting part between the valve rod and the actuating mechanism at the axial fixed position cannot be damaged, and the service life of the valve is prolonged;

2. the high-pressure stop valve for the gas medium realizes the cutoff of the flow channel by linear sealing between the sealing part and the sealing ring, namely, the linear contact is formed between the sealing part and the sealing ring to achieve the sealing, the sealing pressure ratio can be reduced, the closing action of the valve can be completed by adopting smaller driving force, an actuating mechanism with smaller volume is convenient to adopt, and the installation of the high-pressure stop valve is facilitated.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without creative efforts, and the proportional relationship of each component in the drawings in the present specification does not represent the proportional relationship in the actual material selection design, and is only a schematic diagram of the structure or the position, in which:

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a partial enlarged view of fig. 1 of the present invention.

Reference numerals in the drawings indicate:

1-screw A, 2-lower valve body, 3-O-ring A, 4-lower valve seat, 5-O-ring B, 6-upper valve body, 7-O-ring C, 8-O-ring D, 9-pressing sleeve, 10-O-ring E, 11-supporting cylinder, 12-screw B, 13-linear driving mechanism, 14-nut, 15-screw C, 16-connecting plate, 17-valve rod, 18-upper valve seat, 19-sealing ring, 20-composite bearing, 21-guide rod, 22-screw D, 23-O-ring F, 24-sealing cover, 25-valve body, 26-valve seat, 27-flow passage, 28-air inlet, 29-air outlet, 30-sealing part and 31-actuating mechanism.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.

The present invention will be described in detail with reference to fig. 1 and 2.

Example 1

As shown in fig. 1-2, the high-pressure stop valve for gas medium of the present invention comprises a valve body 25, an actuator fixed on the valve body 25, a valve seat 26 located in a valve cavity of the valve body 25, a valve rod 17 having one end connected with the actuator and the other end inserted into the valve cavity and capable of sealing and matching with the valve seat 26, and a sealing assembly a sealing the matching part between the valve rod and the valve body 25, wherein the valve cavity comprises a flow channel 27 having an axis coinciding with the axis of the valve rod 17, two ends of the flow channel 27 are respectively provided with a gas inlet 28 and a gas outlet 29, and the gas inlet 28 is located on one side of the gas outlet 29; the valve seat 26 is annular, the outer annular surface of the valve seat is connected with the flow channel wall, the sealing ring 19 is installed on the inner annular surface of the valve seat, the valve rod 17 is a two-stage stepped shaft, the large-diameter end of the valve rod is connected with the driving end of the actuating mechanism, the small-diameter end of the valve rod is inserted into the valve body 25, a sealing part 30 is arranged between the large-diameter shaft and the small-diameter shaft of the valve rod 17, the flow channel 27 is cut off when the sealing part 30 is matched with the sealing ring 19, and when the small-diameter shaft is opposite to the sealing ring 19.

The sealing assembly A comprises a pressing sleeve 9, an O-shaped ring C7, an O-shaped ring D8 and an O-shaped ring E10, a third-stage stepped hole is formed in the position, in sealing fit with the valve rod 17, of the valve body 25, the aperture of the third-stage stepped hole is gradually reduced along with the approach of the flow passage 27, each hole sequentially comprises a first-stage stepped hole, a second-stage stepped hole and a third-stage stepped hole along with the reduction of the aperture of the third-stage stepped hole, the pressing sleeve 9 is a third-stage stepped shaft with a central hole, each shaft section sequentially comprises a first-stage stepped shaft, a second-stage stepped shaft and a third-stage stepped shaft along with the reduction of the outer diameter of the third-stage stepped shaft, a plurality of annular grooves are formed in the inner wall of the pressing sleeve 9, the; the O-shaped ring C7 is installed in the three-stage stepped hole; the third-stage stepped shaft is inserted into the third-stage stepped hole and pressed on the O-shaped ring C7, and the second-stage stepped shaft is in threaded connection with the second-stage stepped hole; an annular groove is formed in the outer wall of the primary stepped shaft, the O-shaped ring E10 is installed in the annular groove, and the outer ring of the O-shaped ring E10 is in interference fit with the wall of the stepped hole. The O-ring is preferably hydrogenated nitrile rubber.

In actual assembly, the sealing assembly a can also adopt other structures, the specific structural form is not limited, and all structures known in the art for shaft hole sealing can be adopted.

The actuator may be a pneumatic cylinder, such as a single acting pneumatic cylinder, or a pneumatic diaphragm type mechanism, or a screw rod and an internally threaded cylinder in such a manner that the axis movement is achieved by rotation, or the like.

When the valve is opened, the valve rod 17 is moved upwards by the actuating mechanism, so that the flow channel 27 is in a passage state when the small-diameter shaft and the sealing ring 19 are in the same axial position; the high pressure fluid at inlet port 28 then follows flow path 27 into outlet port 29. In the whole process that high-pressure fluid flows through the valve body, because the fluid only contacts with the side wall of the valve rod, thrust cannot be generated at any part of the cross section of the projection surface of the valve rod, and then the pressure fluid cannot generate jacking force on the valve rod, so that the connecting part between the valve rod at the axial fixed position and the actuating mechanism cannot be damaged, and the service life of the valve is prolonged.

Example 2

In the present embodiment, the structure of the valve body 25 is further described in addition to embodiment 1.

As shown in fig. 1-2, in the present invention, an annular groove whose axis coincides with the axis of the valve rod 17 is provided on the inside of the valve body 25, the valve body 25 includes an upper valve body 6 and a lower valve body 2 which are connected in sequence, the upper side of the air inlet 28, the upper side of the flow passage 27 and the upper side of the annular groove are located on the upper valve body 6, and the lower side of the air outlet 29, the lower side of the flow passage 27 and the lower side of the annular groove are located on the lower valve body 2;

the outer ring surface of the valve seat 26 protrudes outwards to form a fixing ring matched with the annular groove;

the actuating mechanism is fixed on the upper valve body 6, and the three-stage stepped hole is formed in the upper valve body 6.

When the valve seat 26 and the valve body are integrally formed, the surface processing of the valve seat 26 and the flow passage and the processing of the installation part of the sealing ring 19 are inconvenient, and the installation of the sealing ring 19 is inconvenient; therefore, in order to reduce the processing cost and improve the processing quality, it is preferable to separate the valve seat from the valve body and divide the valve body into the upper valve body 6 and the lower valve body 2. The upper valve body 6 and the lower valve body 2 can be mutually sealed and fixed by adopting the modes of girth welding, flange bolt connection and the like after the valve seat 26 is assembled. This facilitates both the surface finishing of the valve seat 26 and the flow channel, improving the surface quality, and the mounting of the valve seat 26, with the valve seat 26 clamped between the upper valve body 6 and the lower valve body 2.

Example 3

In the present embodiment, the structure of the valve seat 26 is explained based on the above-described embodiments.

As shown in fig. 1 to 2, in the present invention, the inner diameter of the valve seat 26 is increased from the contact surface between the upper valve body 6 and the lower valve body 2 to the upper side and the lower side simultaneously, so as to guide the pressure fluid, reduce erosion of the valve seat, and ensure the fitting portion between the valve seat and the valve stem.

Furthermore, the valve seat 26 is divided into an upper valve seat 18 and a lower valve seat 4 by a contact surface between the valve body 6 and the lower valve body 2, an annular right-angle groove is arranged on the surface of the upper valve seat 18 opposite to the lower valve seat 4, the part of the lower valve seat 4 opposite to the right-angle groove is protruded outwards to form a ring body with a right-angle triangle cross section, the surface of one right-angle side is connected with the lower valve seat 4, the surface of the other right-angle side is the inner ring surface of the ring body, and the inclined side of the other right-angle side is in a step shape;

the section of the sealing ring 19 is in a right trapezoid shape, the lower bottom and the surface where the right-angle waist is located are respectively contacted with two groove walls of the right-angle groove, the oblique waist is in a step shape and matched with the oblique edge of the ring body, and the right angle between the upper bottom and the right-angle waist is contacted with the sealing part 30, so that the sealing part and the sealing ring 19 are linearly sealed.

The sealing portion may preferably be a curved surface such as a conical surface, a spherical surface, a parabolic surface, or the like, and the sealing portion preferably has a distance from the axis of the stem that gradually decreases along the flow direction of the fluid in the flow passage.

The flow channel is cut off by linear sealing between the sealing part and the sealing ring 19, namely, linear contact is formed between the sealing part and the sealing ring 19 to achieve sealing, the sealing pressure ratio can be reduced, the closing action of the valve can be completed by adopting smaller driving force, an actuating mechanism with smaller volume is convenient to adopt, and the installation of the invention is facilitated.

Example 4

The present embodiment is further explained for the support mechanism of the valve stem 17.

As shown in fig. 1, in the present invention, a guide rod 21 is disposed at the small diameter end of the valve rod 17, the axis of the guide rod 21 coincides with the axis of the valve rod 17, one end of the guide rod 21 is connected to the valve rod 17, the other end of the guide rod passes through the valve body 25, and the guide rod 21 is in sealing fit with the valve body 25 through a sealing assembly B.

The whole disk seat that has at most of valve rod, seal assembly A and actuating mechanism supports spacingly, and the end of the path section of valve rod 17 is in unsettled state, is not convenient for guarantee that the valve rod is in radial fixed, and the unsettled end can bear the radial thrust who comes from fluidic, is unfavorable for the valve rod to guarantee originally required axiality. Therefore, in the invention, the guide rod 21 supports and limits the suspension end of the valve rod, so that the suspension end of the valve rod is prevented from deviating from the preset position due to radial stress, the coaxiality of the valve rod and each supporting part thereof is ensured, and the service life and the sealing performance of the valve rod are improved.

The structure of the sealing component B is consistent with that of the sealing component A and the sealing components B are symmetrical to each other, the inner ring of the O-shaped ring D8 in the sealing component B is in interference fit with the guide rod 27, and meanwhile, the three-stage stepped hole matched with the sealing component B is arranged on the lower valve seat 2.

The valve rod 17 and the guide rod 27 are connected by a screw rod, one end of which is connected to the valve rod, and the other end of which is inserted into and threadedly connected to the guide rod 27.

When the guide bar 27 is provided, the positions of the air inlet 28 and the air outlet 29 are interchangeable and are not restricted by the flow direction of the fluid.

Further, a cap 24 is connected to a portion of the valve body 25 through which the guide rod 21 passes, and the cap 24 covers the guide rod 21.

The provision of the cap 24 prevents the end portion of the guide rod 21 extending outside the valve body from being damaged by foreign objects.

Example 5

The embodiment is an explanation of the actuator.

The actuating mechanism passes through coupling assembling to be fixed on valve body 25, coupling assembling includes a support section of thick bamboo 11, screw B12 and connecting plate 16, connecting plate 16 is fixed on valve body 25, the one end and the connecting plate 16 of a support section of thick bamboo 11 are connected, and its other end and actuating mechanism's shell contact, screw B12's pole portion end pass connecting plate 16, support behind the section of thick bamboo 11 the centre bore in proper order with actuating mechanism's shell threaded connection.

Further, the actuating mechanism is a single-acting cylinder, and the large-diameter end of the valve rod 17 is connected with the tail end of a piston rod of the single-acting cylinder.

The valve rod 17 is connected to the piston rod by a screw, one end of which is connected to the valve rod and the other end of which is inserted into the piston rod and is in threaded connection therewith.

The connecting plate 16 is fixed to the valve body by screws C, in fig. 1, the screws C and the screws B are not interference and are located at different positions in the circumferential direction, and fig. 1 is only used for clearly showing the positions of the screws C and the screws B relative to the axis on the basis of not enlarging the radial dimension.

Example 6

This embodiment is described with respect to the air inlet 28 and the air outlet 29 of the present invention.

There are a plurality of air inlets 28 and air outlets 29, preferably two air inlets 28 and air outlets 29, as shown in fig. 1, the air inlets 28 are a port a and a port B, the air outlets 29 are a port C and a port D, a and B are simultaneously supplied with air or only one is supplied with air, the other is sealed, C and D are simultaneously discharged with air or only one is discharged with air, and the other is sealed.

When the invention is used for delivering oxygen, a special gas, the valve is preferably made of copper material, preferably H62 brass, so as to avoid the phenomenon that sparks are generated between the valve and the flow channel wall due to friction when the gas flows. Brass valves are well suited to prevent oxygen from rubbing out sparks during transportation. The valve stem and connecting rod are preferably QBe2 material.

The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be made by those skilled in the art without inventive work within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.

Claims

1. A high pressure stop valve for gaseous medium, including valve body (25), fix actuating mechanism on valve body (25), be located valve pocket (26) of valve body (25), one end is connected with actuating mechanism and the other end inserts valve pocket and can be sealed with valve pocket (26) matched with valve stem (17) and with the sealed subassembly A of cooperation position between valve stem and the valve body (25), its characterized in that: the valve cavity comprises a flow channel (27) with the axis coincident with that of the valve rod (17), an air inlet (28) and an air outlet (29) are respectively arranged at two ends of the flow channel (27), and the air inlet (28) is positioned at one side of the air outlet (29) close to the actuating mechanism; the valve seat (26) is annular, the outer annular surface of the valve seat is connected with the wall of the flow channel, the inner annular surface of the valve seat is provided with a sealing ring (19), the valve rod (17) is a two-stage stepped shaft, the large-diameter end of the valve rod is connected with the driving end of the actuating mechanism, the small-diameter end of the valve rod is inserted into the valve body (25), a sealing part (30) is arranged between the large-diameter shaft and the small-diameter shaft of the valve rod (17), the flow channel (27) is cut off when the sealing part (30) is matched with the sealing ring (19), and the flow channel (27) is in a passage state when the small-diameter shaft is.

2. High pressure shut-off valve for gaseous media according to claim 1, characterized in that: an annular groove with the axis coincident with that of the valve rod (17) is formed in the valve body (25), the valve body (25) comprises an upper valve body (6) and a lower valve body (2) which are sequentially connected, the upper side of the air inlet (28), the upper side of the flow channel (27) and the upper side of the annular groove are located on the upper valve body (6), and the lower side of the air outlet (29), the lower side of the flow channel (27) and the lower side of the annular groove are located on the lower valve body (2);

the outer ring surface of the valve seat (26) protrudes outwards to form a fixing ring matched with the annular groove;

the actuating mechanism is fixed on the upper valve body (6).

3. High pressure shut-off valve for gaseous media according to claim 2, characterized in that: the inner diameter of the valve seat (26) is synchronously increased from the contact surface between the upper valve body (6) and the lower valve body (2) to the upper side and the lower side.

4. A high pressure shut-off valve for gaseous media according to claim 3, characterized in that: the valve seat (26) is divided into an upper valve seat (18) and a lower valve seat (4) by a contact surface between the valve body (6) and the lower valve body (2), an annular right-angle groove is formed in the surface, opposite to the lower valve seat (4), of the upper valve seat (18), a part, opposite to the right-angle groove, of the lower valve seat (4) protrudes outwards to form a ring body with a right-angled triangle cross section, the surface where a right-angle side is located is connected with the lower valve seat (4), the surface where the other right-angle side is located is the inner ring surface of the ring body, and the bevel side of the ring body is in a step shape;

the cross section of the sealing ring (19) is in a right trapezoid shape, the lower bottom and the surface where the right-angle waist is located are respectively contacted with two groove walls of the right-angle groove, the oblique waist is in a step shape and matched with the oblique edge of the ring body, and the right angle between the upper bottom and the right-angle waist is contacted with the sealing part (30).

5. High pressure shut-off valve for gaseous media according to claim 1, characterized in that: the small-diameter end of the valve rod (17) is provided with a guide rod (21), the axis of the guide rod (21) coincides with the axis of the valve rod (17), one end of the guide rod is connected with the valve rod (17), the other end of the guide rod penetrates out of the valve body (25), and the guide rod (21) is in sealing fit with the valve body (25) through a sealing component B.

6. A high pressure shut-off valve for gaseous media according to claim 5, characterized in that: a sealing cover (24) is connected to the part, penetrated out by the guide rod (21), of the valve body (25), and the guide rod (21) is covered by the sealing cover (24).

7. High pressure shut-off valve for gaseous media according to claim 1, characterized in that: actuating mechanism passes through coupling assembling to be fixed on valve body (25), coupling assembling is including supporting a section of thick bamboo (11), screw B (12) and connecting plate (16), connecting plate (16) are fixed on valve body (25), the one end and the connecting plate (16) of a support section of thick bamboo (11) are connected, and its other end and actuating mechanism's shell contact, the pole portion end of screw B (12) passes connecting plate (16), support behind the centre bore of a section of thick bamboo (11) in proper order and actuating mechanism's shell threaded connection.

8. High pressure shut-off valve for gaseous media according to any of claims 1-7, characterized in that: the actuating mechanism is a single-acting cylinder, and the large-diameter end of the valve rod (17) is connected with the tail end of a piston rod of the single-acting cylinder.