CN210623572U

CN210623572U - Pneumatic film double-seat adjusting valve

Info

Publication number: CN210623572U
Application number: CN201920465388.0U
Authority: CN
Inventors: 戚涛春; 刘玉贵; 王树林
Original assignee: Jiangsu Henghe Automatic Control Valve Co Ltd
Current assignee: Jiangsu Henghe Automatic Control Valve Co Ltd
Priority date: 2019-04-09
Filing date: 2019-04-09
Publication date: 2020-05-26
Anticipated expiration: 2029-04-09

Abstract

The utility model discloses a pneumatic film double seat governing valve, include: a pneumatic film type actuating mechanism and a top guide sleeve type simple seat mechanism; the pneumatic film type actuating mechanism is positioned above the top guide sleeve type simple seat mechanism; the pneumatic membrane type actuating mechanism comprises an actuating unit and a supporting and connecting unit; and an execution unit is arranged on one side of the support connection unit, which is far away from the top guide sleeve type simple seat mechanism. The flexible sealing unit in the utility model moves the push rod by means of the power when the valve is opened and closed, and the flexible sealing unit moves autonomously, has high automation degree and simple structure; the sealing ring is used for active sealing, so that synchronous sealing of the two valve cores is guaranteed, and sealing performance is improved.

Description

Pneumatic film double-seat adjusting valve

Technical Field

The utility model belongs to the governing valve field, in particular to pneumatic film double seat governing valve.

Background

The regulating valve is also called a control valve, and in the field of industrial automation process control, the final control element for changing the process parameters of medium flow, pressure, temperature, liquid level and the like by power operation through receiving the control signal output by a regulating control unit. Generally consisting of an actuator and a valve. If according to the stroke characteristic, the regulating valve can be divided into a straight stroke and an angular stroke; the pneumatic regulating valve, the electric regulating valve and the hydraulic regulating valve can be divided into three types according to the power used by the matched executing mechanism; the method is divided into three types, namely a linear characteristic, an equal percentage characteristic and a parabolic characteristic according to functions and characteristics of the method. The regulating valve is suitable for air, water, steam, various corrosive media, slurry, oil and other media.

At present, the following problems mainly exist:

1. the existing regulating valve has insufficient sealing performance, so that leakage is easy to occur in the using process, the waste of working cost is caused, and equipment and the working environment thereof are easy to pollute.

2. The existing regulating valve has low bearing pressure strength and can not meet the use requirements of part of working scenes in the market, so that the application range of the regulating valve is limited.

3. The existing double-seat regulating valve is asynchronous in sealing and serious in leakage due to the two valve seats, cannot be used in a pipeline with sealing requirements, and is small in application range and poor in practicability.

Disclosure of Invention

The purpose of the invention is as follows: in order to overcome not enough above, the utility model aims at providing a pneumatic film double-seat governing valve, it sets up the filler unit at the governing valve between valve gap and valve rod, make valve gap and valve rod laminating inseparabler, the filler group that sets up the four-layer structure, and set up the component material of filler group into flexible graphite and nickel silk, flexible graphite has extremely strong resistance to pressure, the pliability, the resilience, plasticity and self-lubrication nature, extremely strong anti height, low temperature, anticorrosive, the anti-radiation characteristic, extremely strong antidetonation characteristic and ageing resistance, the characteristic of antitorque, and it is nontoxic, do not contain any carcinogen, do not harm to the environment. The sealing ring is arranged to play a role of sealing. The guide sleeve is arranged to play a role in guiding, centering and supporting. The piston rod is provided with a groove matched with the retainer ring and the spacer ring. The outer lip of the sealing ring is embedded with the inner hole of the cylinder barrel, and the inner lip is embedded with the outer wall of the piston rod. The combined arrangement ensures that the hydraulic cylinder does not involve a piston during working, the sealing form selection range is wider, the diameter of the piston rod is increased, the cross section for bearing hydraulic pressure is increased, and the pressure resistance of the cylinder barrel is improved. The arrangement of the buffer sleeve not only has the buffer effect, but also can improve the pressure resistance of the cylinder barrel due to the friction force generated by the contact of the buffer sleeve and the inner wall of the cylinder barrel. The flexible sealing unit is arranged, so that the push rod is moved by power generated when the valve is opened and closed, the automatic movement is realized, the automation degree is high, and the structure is simple; the sealing ring is used for active sealing, so that synchronous sealing of the two valve cores is guaranteed, and sealing performance is improved.

The technical scheme is as follows: in order to achieve the above object, the utility model provides a pneumatic membrane double seat governing valve, include: a pneumatic film type actuating mechanism and a top guide sleeve type simple seat mechanism; the pneumatic film type actuating mechanism is positioned above the top guide sleeve type simple seat mechanism; the pneumatic membrane type actuating mechanism comprises an actuating unit and a supporting and connecting unit; and an execution unit is arranged on one side of the support connection unit, which is far away from the top guide sleeve type simple seat mechanism.

The execution unit in the utility model comprises a nut, a bolt, an upper membrane cover, a lower membrane cover and a rain-proof cap; a lower membrane cover is arranged on one side of the support connecting unit, which is far away from the top guide sleeve type simple seat mechanism; an upper membrane cover is arranged on one side of the lower membrane cover, which is far away from the supporting and connecting unit; a rain-proof cap is embedded in one side of the upper membrane cover, which is far away from the lower membrane cover; the upper membrane cover and the lower membrane cover are fixed together through nuts and bolts.

The supporting and connecting unit in the utility model comprises an O-shaped sealing ferrule, a stroke indicating sheet, a flow indicator, a bracket, a fixing nut, a fixing bolt and a first round nut; a bracket is arranged below the lower membrane cover; the bracket is fixed with the lower membrane cover through an O-shaped sealing ferrule; a flow indicator is arranged below the O-shaped sealing ferrule; the flow indicator is positioned inside the bracket; a stroke indicating sheet is arranged on one side of the flow indicator; the pneumatic thin film type actuating mechanism is fixed with the top guide sleeve type simple seat mechanism through a fixing nut, a fixing bolt and a first round nut; the first round nut is positioned below the fixing nut.

The utility model discloses in simple seat mechanism of top guidance nature cover type include: the valve comprises a valve body, a valve seat, a valve core, a valve rod and a valve cover; a valve seat is arranged in the valve body; a valve core is arranged above the valve seat, and a valve rod is embedded in the middle of the valve core; a valve cover is arranged above the valve rod; a packing unit is arranged inside the valve cover; the packing unit comprises a packing seat, a packing spacer bush, a packing gland and a packing pressing plate; a filler spacer bush is arranged on one side of the filler seat, which is far away from the valve seat; a packing gland is arranged on one side of the packing spacer sleeve, which is far away from the packing seat; and a packing pressure plate is arranged on one side of the packing gland, which is far away from the packing spacer bush.

The utility model discloses the setting of packing unit for the valve gap is inseparabler with the valve rod laminating.

In the utility model, a filler group is arranged between the filler seat and the filler spacer bush; another packing group is arranged between the packing spacer bush and the packing gland; the filler group has a four-layer structure; the axial section of the first layer structure is rectangular, and the first layer structure is made of flexible graphite and nickel wires; and the second layer structure, the third layer structure and the fourth layer structure are all made of flexible graphite.

The utility model provides a flexible graphite has extremely strong resistance to pressure, pliability, resilience, plasticity and self-lubricity, extremely strong anti high, low temperature, anticorrosive, anti-radiation characteristic, extremely strong antidetonation characteristic and ageing resistance, antitorque characteristics, and its nontoxic, do not contain any carcinogen, do not have harm to the environment.

The valve rod in the utility model is fixed on the valve cover through the hexagonal thin nut; the packing pressing plate is fixed on the valve cover through two double-end studs and two six-end nuts; the packing unit and the valve cover are fixed together through two second round nuts; the valve cover is fixed on the valve body through two double-end studs and two six-end nuts.

In the utility model, a winding gasket is arranged between the valve cover and the valve body; and a winding gasket is arranged between the valve body and the valve seat.

The valve seat of the utility model is provided with a cylinder body; a first guide sleeve is arranged on the cylinder body.

The bottom of the valve rod in the utility model is provided with a buffer unit, and the buffer unit comprises a buffer sleeve, a spacer ring, a sealing ring and a second guide sleeve; two sealing rings are arranged on the valve rod; a guide sleeve is arranged between the two sealing rings; a spacer ring is arranged between the sealing ring and the second guide sleeve; a buffer sleeve is arranged on one side, far away from the second guide sleeve, of the upper sealing ring; a spacer ring is arranged between the buffer sleeve and the sealing ring; and a spacer ring is arranged on one side of the lower sealing ring away from the second guide sleeve.

The sealing ring plays a role of sealing. The second guide sleeve plays a role of guiding, centering and supporting. The piston rod is provided with a groove matched with the retainer ring and the spacer ring. The outer lip of the sealing ring is embedded with the inner hole of the cylinder barrel, and the inner lip is embedded with the outer wall of the piston rod. The combined arrangement ensures that the hydraulic cylinder does not involve a piston during working, the sealing form selection range is wider, the diameter of the piston rod is increased, the cross section for bearing hydraulic pressure is increased, and the pressure resistance of the cylinder barrel is improved. The arrangement of the buffer sleeve not only has the buffer effect, but also can improve the pressure resistance of the cylinder barrel due to the friction force generated by the contact of the buffer sleeve and the inner wall of the cylinder barrel.

The top guide sleeve type simple seat mechanism in the utility model is internally provided with a flexible sealing unit, the flexible sealing unit comprises an air duct, a pneumatic push rod, a permanent magnetic push head, a plurality of flexible sealing rings, a connecting film and a driving permanent magnet, the air duct is arranged inside the top guide sleeve type simple seat mechanism, one end of the air duct is arranged in a pneumatic film type actuating mechanism, the other end of the air duct is arranged in a valve seat, one end of the air duct, which is positioned in the valve seat, is provided with the pneumatic push rod, the pneumatic push rod surrounds the valve seat, one end of the pneumatic push rod is provided with the permanent magnetic push head, one side of the permanent magnetic push head, which is far away from the pneumatic push rod, is provided with the flexible sealing ring, the flexible sealing ring surrounds a valve core, one side of the flexible sealing ring is, the flexible sealing ring is provided with a plurality of driving permanent magnets, and the driving permanent magnets are opposite to the permanent magnet pushing heads in magnetic pole.

The flexible sealing unit in the utility model moves the push rod by means of the power generated when the valve is opened and closed, and the flexible sealing unit moves autonomously, has high automation degree and simple structure; the sealing ring is used for active sealing, so that synchronous sealing of the two valve cores is guaranteed, and sealing performance is improved.

Above-mentioned technical scheme can find out, the utility model discloses following beneficial effect has:

1. the utility model discloses in the governing valve set up packing unit between valve gap and valve rod, make valve gap and valve rod laminating inseparabler, set up the packing group of quadruple construction, and set up the component material of packing group into flexible graphite and nickel silk, flexible graphite has extremely strong resistance to pressure, pliability, resilience, plasticity and self-lubricating nature, extremely strong anti height, low temperature, anticorrosive, the anti-radiation characteristic, extremely strong antidetonation characteristic and ageing resistance, the characteristic of antitorque bent, and it is nontoxic, do not contain any carcinogen, do not have harm to the environment.

2. The sealing ring plays a role of sealing. The guide sleeve plays a role in guiding, centering and supporting. The piston rod is provided with a groove matched with the retainer ring and the spacer ring. The outer lip of the sealing ring is embedded with the inner hole of the cylinder barrel, and the inner lip is embedded with the outer wall of the piston rod. The combined arrangement ensures that the hydraulic cylinder does not involve a piston during working, the sealing form selection range is wider, the diameter of the piston rod is increased, the cross section for bearing hydraulic pressure is increased, and the pressure resistance of the cylinder barrel is improved. The arrangement of the buffer sleeve not only has the buffer effect, but also can improve the pressure resistance of the cylinder barrel due to the friction force generated by the contact of the buffer sleeve and the inner wall of the cylinder barrel.

3. The flexible sealing unit in the utility model moves the push rod by means of the power when the valve is opened and closed, and the flexible sealing unit moves autonomously, has high automation degree and simple structure; the sealing ring is used for active sealing, so that synchronous sealing of the two valve cores is guaranteed, and sealing performance is improved.

Drawings

Fig. 1 is a schematic view of the overall structure of a pneumatic membrane double-seat regulating valve according to the present invention;

fig. 2 is a schematic view of the overall structure of the pneumatic diaphragm actuator according to the present invention;

fig. 3 is a schematic view of the overall structure of the top guide sleeve type simple seat mechanism of the present invention;

FIG. 4 is a schematic axial cross-sectional view of a packing set according to the present invention;

FIG. 5 is a schematic axial sectional view of the packing set according to the present invention after each layer is separated;

fig. 6 is a schematic axial cross-sectional view of a buffer unit according to the present invention;

FIG. 7 is a schematic cross-sectional view of a top guide sleeve type simple seat mechanism of the present invention;

in the figure: the pneumatic diaphragm type actuator-1, the actuator unit-11, the nut-111, the bolt-112, the upper diaphragm cover-113, the lower diaphragm cover-114, the rain-proof cap-115, the support connecting unit-12, the O-shaped sealing ferrule-121, the stroke indicator-122, the flow indicator-123, the bracket-124, the fixing nut-125, the fixing bolt-126, the first round nut-127, the top guide sleeve type simple seat mechanism-2, the valve body-21, the valve seat-22, the valve core-23, the valve rod-24, the buffer sleeve-241, the spacer ring-242, the sealing ring-243, the second guide sleeve-244, the valve cover-25, the packing seat-26, the packing spacer sleeve-27, the packing group-28, the packing gland-29, the lower diaphragm-114, the lower diaphragm-113, the lower, The device comprises a packing pressing plate-210, a hexagonal thin nut-211, a double-end stud-212, a six-end nut-213, a second round nut-214, a winding washer-215, a first guide sleeve-216, a cylinder-217, a flexible sealing unit-3, an air duct-31, a pneumatic push rod-32, a permanent magnet push head-33, a flexible sealing ring-34, a connecting film-35 and a driving permanent magnet-36.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Example 1

A pneumatic diaphragm double seat regulator valve as shown in fig. 1, comprising: a pneumatic film type actuating mechanism 1 and a top guide sleeve type simple seat mechanism 2; the pneumatic thin film type actuating mechanism 1 is positioned above the top guide sleeve type simple seat mechanism 2; the pneumatic thin film type actuating mechanism 1 comprises an actuating unit 11 and a supporting and connecting unit 12; an actuating unit 11 is arranged on one side of the support connecting unit 12 far away from the top-guide sleeve type simple seat mechanism 2.

Example 2

In addition, as shown in fig. 2, the execution unit 11 includes a nut 111, a bolt 112, an upper membrane cover 113, a lower membrane cover 114, and a rain-proof cap 115; a lower membrane cover 114 is arranged on one side of the support connecting unit 12 far away from the top guide sleeve type simple seat mechanism 2; an upper membrane cover 113 is arranged on one side of the lower membrane cover 114 far away from the supporting and connecting unit 12; a rain-proof cap 115 is embedded in one side of the upper membrane cover 113 far away from the lower membrane cover 114; the upper film cover 113 and the lower film cover 114 are fixed together by a nut 111 and a bolt 112.

Further, as shown in fig. 2, the support connection unit 12 includes an O-ring seal 121, a stroke indicating plate 122, a flow indicator 123, a bracket 124, a fixing nut 125, a fixing bolt 126, and a first round nut 127; a bracket 124 is arranged below the lower membrane cover 114; the bracket 124 is fixed with the lower membrane cover 114 through an O-shaped sealing ring 121; a flow indicator 123 is arranged below the O-shaped sealing ferrule 121; the flow indicator 123 is located inside the bracket 124; a stroke indicating sheet 122 is arranged on one side of the flow indicator 123; the pneumatic film type actuating mechanism 1 is fixed with the top guide sleeve type simple seat mechanism 2 through a fixing nut 125, a fixing bolt 126 and a first round nut 127; the first round nut 127 is located below the fixing nut 125.

Example 3

As shown in fig. 3, the top guide sleeve type simple seat mechanism 2 includes: a valve body 21, a valve seat 22, a valve core 23, a valve rod 24 and a valve cover 25; a valve seat 22 is arranged in the valve body 21; a valve core 23 is arranged above the valve seat 22, and a valve rod 24 is embedded in the middle of the valve core 23; a valve cover 25 is arranged above the valve rod 24; a packing unit is arranged inside the valve cover 25; the packing unit comprises a packing seat 26, a packing spacer 27, a packing gland 29 and a packing pressure plate 210; a packing spacer 27 is arranged on one side of the packing seat 26 away from the valve seat 22; a packing gland 29 is arranged on one side of the packing spacer 27 away from the packing seat 26; the side of the packing gland 29 remote from the packing cup 27 is provided with a packing plate 210.

In addition, as shown in fig. 3, a packing set 28 is disposed between the packing seat 26 and the packing spacer 27; another packing group 28 is arranged between the packing spacer 27 and the packing gland 29; as shown in fig. 4, the packing group 28 has a four-layer structure; as shown in fig. 5, the axial cross section of the first layer structure is rectangular, and the first layer structure is made of flexible graphite and nickel wires; and the second layer structure, the third layer structure and the fourth layer structure are all made of flexible graphite.

Further, as shown in fig. 3, the valve stem 24 is fixed to the valve cover 25 by a hexagonal thin nut 211; the packing pressing plate 210 is fixed on the valve cover 25 through two studs 212 and two six-headed nuts 213; the packing unit and the valve cover 25 are fixed together through two second round nuts 214; the bonnet 25 is secured to the valve body 21 by two studs 212 and two hex nuts 213.

In addition, as shown in fig. 3, a winding gasket 215 is disposed between the valve cover 25 and the valve body 21; a winding gasket 215 is provided between the valve body 21 and the valve seat 22.

Furthermore, as shown in fig. 3, a cylinder 217 is disposed on the valve seat 22; the cylinder 217 is provided with a first guide sleeve 216.

Furthermore, as shown in fig. 6, a buffer unit is arranged at the bottom of the valve rod 24, and the buffer unit includes a buffer sleeve 241, a spacer ring 242, a sealing ring 243 and a second guide sleeve 244; two sealing rings 243 are arranged on the valve rod 24; a guide sleeve 244 is arranged between the two sealing rings; a spacer ring 242 is arranged between the sealing ring 243 and the second guide sleeve 244; a buffer sleeve 241 is arranged on one side of the upper sealing ring 243 far away from the second guide sleeve 244; a spacer ring 242 is arranged between the buffer sleeve 241 and the sealing ring 243; the lower sealing ring 243 is provided with a spacer ring 242 on the side away from the second guide sleeve 244.

Further, as shown in fig. 7, a flexible sealing unit 3 is arranged in the top-guided simple seat mechanism 2, the flexible sealing unit 3 includes an air duct 31, a pneumatic push rod 32, a permanent magnetic pusher 33, a flexible sealing ring 34, a connecting film 35 and a driving permanent magnet 36, the air duct 31 is arranged in the top-guided simple seat mechanism 2, one end of the air duct 31 is arranged in the pneumatic thin film actuator 1, the other end of the air duct 31 is arranged in the valve seat 22, one end of the air duct 31, which is located in the valve seat 22, is provided with the pneumatic push rod 32, the pneumatic push rod 32 surrounds the valve seat 22, one end of the pneumatic push rod 32 is provided with the permanent magnetic pusher 33, one side of the permanent magnetic pusher 33, which is far away from the pneumatic push rod 32, is provided with the flexible sealing ring 34, the flexible sealing ring 34 surrounds the valve core 23, the flexible sealing ring is characterized in that a connecting film 35 is arranged on one side of the flexible sealing ring 34, the connecting film 35 is connected with the flexible sealing ring 34 and the valve seat 22, a driving permanent magnet 36 is arranged in the flexible sealing ring 34, the driving permanent magnet 36 is provided with a plurality of magnets, and the driving permanent magnet 36 and the permanent magnet pushing head 33 are opposite in magnetic pole.

Example 4

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications can be made without departing from the principles of the present invention, and these modifications should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a pneumatic membrane double seat governing valve which characterized in that: the method comprises the following steps: a pneumatic film type actuating mechanism (1) and a top guide sleeve type simple seat mechanism (2); the pneumatic film type actuating mechanism (1) is positioned above the top guide sleeve type simple seat mechanism (2); the pneumatic membrane type actuating mechanism (1) comprises an actuating unit (11) and a supporting and connecting unit (12); an execution unit (11) is arranged on one side of the support connection unit (12) far away from the top guide sleeve type simple seat mechanism (2); the top guide sleeve type simple seat mechanism (2) comprises: the valve comprises a valve body (21), a valve seat (22), a valve core (23), a valve rod (24) and a valve cover (25); a valve seat (22) is arranged in the valve body (21); the valve seat (22) comprises a first valve seat and a second valve seat; a valve core (23) is arranged above the valve seat (22), and a valve rod (24) is embedded in the middle of the valve core (23); a valve cover (25) is arranged above the valve rod (24); a packing unit is arranged inside the valve cover (25); the packing unit comprises a packing seat (26), a packing spacer bush (27), a packing gland (29) and a packing pressing plate (210); a packing spacer bush (27) is arranged on one side, away from the valve seat (22), of the packing seat (26); a packing gland (29) is arranged on one side, away from the packing seat (26), of the packing spacer sleeve (27); a packing pressure plate (210) is arranged on one side, away from the packing spacer bush (27), of the packing gland (29); a buffer unit is arranged at the bottom of the valve rod (24), and comprises a buffer sleeve (241), a spacer ring (242), a sealing ring (243) and a second guide sleeve (244); two sealing rings (243) are arranged on the valve rod (24); a second guide sleeve (244) is arranged between the two seal rings; a spacer ring (242) is arranged between the sealing ring (243) and the second guide sleeve (244); the sealing ring (243) is positioned above the second guide sleeve (244), and a buffer sleeve (241) is arranged on one side far away from the second guide sleeve (244); a spacer ring (242) is arranged between the buffer sleeve (241) and the sealing ring (243); the sealing ring (243) is positioned below the second guide sleeve (244), and a spacer ring (242) is arranged on one side far away from the second guide sleeve (244); a flexible sealing unit (3) is arranged in the top-guide sleeve type simple seat mechanism (2), the flexible sealing unit (3) comprises an air duct (31), a pneumatic push rod (32), a permanent magnetic pushing head (33), a flexible sealing ring (34), a connecting film (35) and a driving permanent magnet (36), the air duct (31) is arranged inside the top-guide sleeve type simple seat mechanism (2), one end of the air duct (31) is arranged in the pneumatic film type actuating mechanism (1), the other end of the air duct (31) is arranged in the valve seat (22), one end, located in the valve seat (22), of the air duct (31) is provided with the pneumatic push rod (32), the pneumatic push rod (32) is provided with a plurality of air ducts, the pneumatic push rod (32) surrounds the valve seat (22), one end of the pneumatic push rod (32) is provided with the permanent magnetic pushing head (33), one side, away from the pneumatic push rod (32), of the permanent magnetic pushing head (33) is, the flexible sealing ring (34) surrounds the valve core (23), a connecting film (35) is arranged on one side of the flexible sealing ring (34), the connecting film (35) is connected with the flexible sealing ring (34) and the valve seat (22), a driving permanent magnet (36) is arranged in the flexible sealing ring (34), a plurality of driving permanent magnets (36) are arranged, and the magnetic poles of the driving permanent magnets (36) are opposite to those of the permanent magnet pushing head (33).

2. A pneumatic diaphragm double seat regulator valve according to claim 1 wherein: the execution unit (11) comprises a nut (111), a bolt (112), an upper membrane cover (113), a lower membrane cover (114) and a rain-proof cap (115); a lower membrane cover (114) is arranged on one side of the support connecting unit (12) far away from the top guide sleeve type simple seat mechanism (2); an upper membrane cover (113) is arranged on one side, away from the supporting and connecting unit (12), of the lower membrane cover (114); a rain-proof cap (115) is embedded in one side, far away from the lower membrane cover (114), of the upper membrane cover (113); the upper membrane cover (113) and the lower membrane cover (114) are fixed together through a nut (111) and a bolt (112).

3. A pneumatic diaphragm double seat regulator valve according to claim 2 wherein: the supporting and connecting unit (12) comprises an O-shaped sealing ferrule (121), a stroke indicating sheet (122), a flow indicator (123), a bracket (124), a fixing nut (125), a fixing bolt (126) and a first round nut (127); a bracket (124) is arranged below the lower membrane cover (114); the bracket (124) is fixed with the lower membrane cover (114) through an O-shaped sealing ring (121); a flow indicator (123) is arranged below the O-shaped sealing ferrule (121); the flow indicator (123) is located inside the bracket (124); a stroke indicating sheet (122) is arranged on one side of the flow indicator (123); the pneumatic film type actuating mechanism (1) is fixed with the top guide sleeve type simple seat mechanism (2) through a fixing nut (125), a fixing bolt (126) and a first round nut (127); the first round nut (127) is positioned below the fixed nut (125).

4. A pneumatic diaphragm double seat regulator valve according to claim 1 wherein: a filler group (28) is arranged between the filler seat (26) and the filler spacer bush (27); another packing group (28) is arranged between the packing spacer sleeve (27) and the packing gland (29); the filler group (28) has a four-layer structure comprising a first layer structure, a second layer structure, a third layer structure and a fourth layer structure; the axial section of the first layer structure is rectangular, and the first layer structure is made of flexible graphite and nickel wires; and the second layer structure, the third layer structure and the fourth layer structure are all made of flexible graphite.

5. A pneumatic diaphragm double seat regulator valve according to claim 1 wherein: the valve rod (24) is fixed on the valve cover (25) through a hexagonal thin nut (211); the packing pressing plate (210) is fixed on the valve cover (25) through two double-end studs (212) and two six-end nuts (213); the packing unit and the valve cover (25) are fixed together through two second round nuts (214); the valve cover (25) is fixed on the valve body (21) through two double-end studs (212) and two six-end nuts (213).

6. The pneumatic diaphragm double seat regulator valve according to claim 5, wherein: a winding gasket (215) is arranged between the valve cover (25) and the valve body (21); a winding gasket (215) is arranged between the valve body (21) and the valve seat (22).

7. The pneumatic diaphragm double seat regulator valve according to claim 6, wherein: a cylinder body (217) is arranged on the valve seat (22); the cylinder (217) is provided with a first guide sleeve (216).