Wellhead gate valve for oil exploitation

Abstract

The utility model discloses a wellhead gate valve for oil exploitation, and belongs to the technical field of wellhead gate valves. Comprising a valve body, a valve element assembly, a pressure transmitter, a double sealer and an airtight assembly. A liquid inlet and a liquid outlet are formed in the two ends of the valve body in an opposite mode. An airtight bin is integrally formed in the upper end of the valve body, and annular grooves are formed in the positions, on the peripheries of the liquid inlet and the liquid outlet, of the inner side of the valve body. A straight pipe groove is formed between the annular groove and the airtight bin; the valve element assembly comprises a valve plate embedded in the inner side of the valve body, a nut is fixed to the top face of the valve plate, a valve rod is connected to the nut in a screwed mode, and a valve rod containing groove is formed in the inner side of the valve plate. The pressure transmitter is embedded in the inner side of the airtight bin and fixed to the airtight bin. According to the wellhead gate valve for oil exploitation, leakage monitoring can be achieved, and the valve seat and the valve rod are sealed in the whole process; the valve plate and the valve body are highly sealed in a closed state, and the opening friction force of the valve plate is small.

Description

TECHNICAL FIELD

[0001] The utility model relates to a wellhead gate valve for oil exploitation belongs to wellhead gate valve technical field. BACKGROUND

[0002] In the exploitation of oil, oil pump will be oil in the oil storage layer into the oil pipe, then through the wellhead gate valve discharge, carry out the exploitation of oil, at present, most wellhead gate valves are composed of valve body, valve seat, valve cover, valve rod and valve plate, the valve plate is lifted and lowered through the valve rod, realizes the opening and closing of the valve plate, the valve plate is sealed through the close contact with the valve seat, such as the wellhead gate valve for oil exploitation disclosed in Chinese patent publication No. UTILITY MODEL CONTENTS

[0003] In order to solve the above problems, the utility model provides a wellhead gate valve for oil exploitation can carry out the air pressure sealing to the action part of wellhead gate valve, realizes the closure to the outside of gate valve, when the valve body and valve plate are closed, the sealing effect is good, the friction of valve plate opening is small.

[0004] The utility model discloses a wellhead gate valve for oil exploitation, including:

[0005] Valve body, the both ends of valve body are provided with liquid inlet and liquid outlet, and the upper end of valve body is integrally made into airtight bin, and the inner side of valve body is provided with annular groove around liquid inlet and liquid outlet, and the straight pipe groove is arranged between annular groove and airtight bin.

[0006] Valve core assembly, the valve core assembly includes the valve plate that is embedded in the inner side of valve body, the valve plate top is fixed with the screw nut, the screw nut is screwed with the valve rod, and the inner side of valve plate is provided with valve rod containing groove.

[0007] The pressure transmitter is embedded in the inner side of the air-tight chamber and fixed with the air-tight chamber;

[0008] The double seal device comprises an air pressure adjusting chamber fixed on the top of the air-tight chamber and hollow at the bottom, an air nozzle fixed on the air pressure adjusting chamber, an oval structure of the air pressure adjusting chamber in the lateral section, a sealing pipe section integrally formed on the top of the air pressure adjusting chamber, an enclosed plate fixed on the top of the sealing pipe section, an air pressure plate arranged on the inner side of the air pressure adjusting chamber, a valve rod rotatably connected to the upper part of the air pressure plate, the upper part of the valve rod movably penetrating through the sealing pipe section and the enclosed plate and fixed with a rotating handle, and a first sealing ring arranged between the sealing pipe section and the valve rod.

[0009] The air-tight assembly comprises a ring-shaped air bag fixed on the inner side of the ring groove, a spiral pipe fixed on the ring-shaped air bag and embedded in a straight pipe groove, an air pipe rotatably connected to the spiral pipe, sealing filler poured between the straight pipe groove and the air pipe, and a flow guide cover rotatably connected to the top of the air pipe.

[0010] The pressure gas is filled between the air pressure plate and the air-tight chamber, the pressure gas is fully closed in the travel range of the valve plate, the fluid leakage phenomenon of the valve body and the valve rod position can be prevented, when the valve plate continuously goes down to close the gate valve, the air pressure plate is synchronously pressed down, the air pressure plate pressurizes the air-tight chamber, the pressure gas is punched into the ring-shaped air bag at the same time, and the ring-shaped air bag can pressurize and close the valve plate.

[0011] Before use, the air pressure plate is rotated and slid to the high position, then the gate valve is inflated, the compressed gas is filled into the air pressure adjusting chamber through the air nozzle, the compressed gas is air or inert gas, the gas enters the air pressure adjusting chamber and the air-tight chamber, at this time, the pressure gas in the air-tight chamber is fully closed in the travel range of the valve plate, when inflating, the pressure value is monitored in real time through the pressure transmitter, when the pressure value reaches the set value, the inflation is stopped, at this time, the valve plate and the valve body are air-tightly sealed through the compressed air in the air-tight chamber.

[0012] When the gate valve is closed, the rotating handle is rotated, the valve rod is driven to rotate by the rotating handle, the valve plate is driven to linearly go down by the screw nut, when the valve plate goes down, the air pressure plate cannot be circumferentially rotated due to the oval structure of the air pressure adjusting chamber in the lateral section, when the valve rod is rotated, the valve rod synchronously drives the air pressure plate to linearly go down, when the air pressure plate goes down, the compressed gas in the air pressure adjusting chamber is compressed by the air pressure plate, the compressed gas pressurizes the air-tight chamber, the travel position of the valve plate is air-tightly closed through the compressed gas, at the same time, the compressed gas is punched into the air pipe, the ring-shaped air bag is continuously punched through the air pipe and the spiral pipe, when the valve plate continuously goes down, the ring-shaped air bag continuously pressurizes the valve plate, when the valve plate goes down to the position, the ring-shaped air bag can complete the pressurization and sealing of the valve plate, so as to ensure the sealing performance after the gate plate is closed.

[0013] When the gate valve is opened, the reverse rotating handle drives the valve rod to rotate, the valve rod drives the valve plate to move up linearly through the nut, the valve plate moves up, at this time, the valve rod synchronously drives the air pressure plate to move up linearly, when the air pressure plate moves up, the space of the air pressure adjusting chamber and the air tight chamber becomes larger, so that the pressure of the space is reduced, and because the valve plate dynamically extrudes the annular air bag, and because the annular air bag is communicated with the air tight chamber, the friction between the annular air bag and the valve plate is reduced, at this time, the valve plate can be smoothly lifted to make the inlet and outlet of the valve body communicated;

[0014] Air tight alarm, when the pressure transmitter monitors that the air pressure is lower than the set value, the air tight leakage alarm is sent.

[0015] Further, the valve rod comprises an upper rod segment, an intermediate rod segment and a lower rod segment which are integrally manufactured, the outer diameter of the intermediate rod segment is larger than that of the upper rod segment and the lower rod segment, the bottom of the air pressure adjusting chamber is fixed with a bottom disc, a plurality of air holes are formed in the bottom disc, a guide bearing is arranged at the center of the bottom disc, the lower rod segment penetrates through the guide bearing, and the intermediate rod segment is attached to the top surface of the bottom disc; the upper rod segment is screwed with the air pressure plate, and the lower rod segment is screwed with the nut; the valve rod moves through the guide bearing, the guide bearing is supported by the bottom disc, and when the valve rod rotates, the rotation of the valve rod is guided by the guide bearing, so that the rotation of the valve rod is more stable; the bottom disc can support the guide bearing, and the air pressure adjusting chamber and the air tight chamber are communicated through the air holes of the bottom disc; the upper rod segment of the valve rod can drive the air pressure plate to move up linearly, and the lower rod segment of the valve rod can drive the valve plate to move up linearly; the intermediate rod segment and the bottom disc cooperate to realize the axial positioning of the valve rod and the bottom disc.

[0016] Further, the lower rod segment is sleeved with a limiting sleeve below the bottom disc, and the limiting sleeve is fastened with the lower rod segment through bolts; the valve rod is axially positioned by the limiting sleeve and the intermediate rod segment, so as to prevent the valve rod and the valve plate from being separated from the valve body.

[0017] Further, the pressure transmitter is connected to a controller, and the controller is connected to an alarm, the pressure transmitter monitors the pressure value of the air tight chamber in real time, and sends the pressure value to the controller, when the difference between the pressure value and the set value is calculated, and the calculation result is greater than the set threshold value, the controller sends a signal to the alarm, and the alarm alarms.

[0018] Further, the inside top of the sealing pipe section is embedded with a rotary encoder, the valve rod passes through the rotary end of the rotary encoder and is fixed with the rotary end; the rotary encoder is connected to the controller, when the valve rod is operated, the valve rod is rotated, the valve rod transmits the rotary force to the rotary encoder, the rotary encoder collects the number of rotations of the valve rod and sends the number of rotations to the controller, the controller determines the opening state of the valve plate and the position of the air pressure plate at this time according to the rotation direction and the number of rotations, and since the air pressure plate compresses the gas filled in the gas nozzle, the pressure value is monitored in real time by the pressure transmitter during compression, and the controller performs difference calculation according to the real-time collected pressure value and the set pressure value corresponding to the position of the air pressure plate, when the difference exceeds the set value, the controller sends a signal to the alarm, and the alarm issues a warning of the gate valve leakage.

[0019] Further, the valve body is integrally provided with a guide rail body on both sides of the liquid inlet and the liquid outlet; a sliding groove is formed on the outer surface of the valve plate and is in sliding cooperation with the guide rail body, when the valve body is opened and closed, the sliding groove of the valve body cooperates with the guide rail body, the linearity of the valve plate is better, and when the valve body and the valve plate are sealed, the impact resistance and deformation resistance of the valve plate are stronger.

[0020] Further, the bottom of the air pressure adjusting bin is integrally provided with a lower edge portion, the lower edge portion is embedded into the inside of the air-tight bin, and the outer wall of the lower edge portion and the inner wall of the air-tight bin are provided with a second sealing ring, the air pressure adjusting bin can be assembled into one with the air-tight bin through the lower edge portion, and the installation sealing of the lower edge portion and the air-tight bin can be realized through the second sealing ring, and the sealing effect is good.

[0021] Further, a valve plate containing groove is arranged on the inside bottom of the valve body opposite to the valve plate, when the bottom of the valve plate enters the valve plate containing groove, sufficient air pressure pressing stroke can be provided for the annular air bag during the downward movement of the valve plate to the valve plate containing groove, so as to continuously pressurize the annular air bag; the annular air bag realizes high-pressure sealing of the valve plate.

[0022] Further, a bypass pipeline is arranged between the top and the bottom of the air pressure adjusting bin; an electrically controlled opening and closing valve is arranged on the bypass pipeline, when the valve plate needs to be opened, the electrically controlled opening and closing valve is opened, at this time, the upper and lower parts of the air pressure plate are communicated through the bypass pipeline; the pressure gas in the air-tight bin quickly enters the upper part of the air pressure plate; so as to quickly depressurize the air-tight bin and the annular air bag, the friction is small when the valve plate is opened; when the air pressure plate moves upward to the position, the electrically controlled opening and closing valve is closed; when the air pressure plate moves downward again, since the bypass pipeline is closed, at this time, the air-tight bin and the annular air bag are continuously pressurized by the air pressure, the air pressure plate pressurizes and seals the air-tight bin, and the pressure gas is punched into the annular air bag; the annular air bag can pressurize and seal the valve plate.

[0023] Compared with the prior art, the wellhead gate valve for oil exploitation can realize air tightness of the valve plate and the valve body in the open or closed state, realize air pressure sealing of the valve plate stroke position, realize external sealing of the gate valve, prevent fluid leakage at the valve seat and valve rod position, simultaneously charge pressure gas into the annular air bag when the valve plate stroke position is air pressure sealed, realize high pressure sealing of the gate valve when the valve body and the valve plate are closed, have good sealing performance, realize pressure relief of the high pressure sealing position when the gate valve is opened, and the gate plate is opened without obstruction, in addition, the sealing performance of the gate valve can be monitored, and the one-gas multi-use function is realized. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a structure schematic view of the wellhead gate valve for oil exploitation of the utility model.

[0025] Figure 2 It is a whole structure schematic view of the air tightness assembly.

[0026] Figure 3 It is a structure schematic view of the air tightness assembly and the valve body installation.

[0027] Figure 4 It is a structure schematic view of the Figure 3 It is a structure schematic view of the local enlargement of A in the middle.

[0028] Figure 5 It is a structure schematic view of the inside of the valve body.

[0029] Figure 6 It is a structure schematic view of the valve body and the valve plate installation.

[0030] Figure 7 It is a structure schematic view of the valve rod.

[0031] Figure 8 It is a structure schematic view of the wellhead gate valve for oil exploitation of the utility model.

[0032] The drawings show that: 1, the valve body, 2, the liquid inlet, 3, the liquid outlet, 4, the air tightness storehouse, 5, the ring groove, 6, the straight pipe groove, 7, the valve plate, 8, the screw nut, 9, the valve rod, 10, the pressure transmitter, 11, the air pressure adjusting storehouse, 12, the air cock, 13, the sealing pipe section, 14, the sealing plate, 15, the air pressure plate, 16, the first sealing ring, 17, the annular air bag, 18, the screw pipe, 19, the air pipe, 20, the sealing filler, 21, the flow guide cover, 22, the upper rod section, 23, the middle rod section, 24, the lower rod section, 25, the bottom disc, 26, the air hole, 27, the limiting sleeve, 28, the guide rail body, 29, the lower edge, 30, the valve plate containing groove, 31, the valve rod containing groove, 32, the electric control on-off valve. DETAILED DESCRIPTION

[0033] Embodiment 1:

[0034] As Figures 1 to 7 shown for oil extraction wellhead gate valve, comprising:

[0035] Valve body 1, the valve body 1 both ends opposite setting has liquid inlet 2 and liquid outlet 3;The valve body 1 upper end is integrally made with airtight storehouse 4, the valve body 1 inside at liquid inlet 2 and liquid outlet 3 periphery is provided with annular groove 5;The annular groove 5 and airtight storehouse 4 between opening has straight pipe groove 6;

[0036] Valve core assembly, the valve core assembly includes the valve plate 7 inlaying in the inside of valve body 1, the valve plate 7 top is fixed with the screw nut 8, the screw nut 8 is screwed with valve stem 9, the valve plate 7 inside is provided with valve stem accommodating groove 31;

[0037] Pressure transmitter 10, pressure transmitter 10 inlaying in the inside of airtight storehouse 4, and with airtight storehouse 4 fixed;

[0038] Double sealer;The double sealer includes the air pressure adjusting storehouse 11 fixed on the top of airtight storehouse 4, and the bottom hollow, the air pressure adjusting storehouse 11 is fixed with air nozzle 12;The air pressure adjusting storehouse 11 transverse section is oval structure;The air pressure adjusting storehouse 11 top is integrally made with sealing pipe section 13, and the sealing pipe section 13 top is fixed with sealing plate 14;The air pressure adjusting storehouse 11 inside is provided with air pressure plate 15;The air pressure plate 15 is screwed on the upper portion of valve stem 9, and the upper portion of valve stem 9 is movably through sealing pipe section 13 and sealing plate 14, and is fixed with to swing hand;The sealing pipe section 13 and valve stem 9 are provided with first sealing ring 16 between them;

[0039] Airtight assembly, the airtight assembly includes annular air bag 17 adhesively fixed in the inside of annular groove 5;The annular air bag 17 is fixed with spiral pipe 18, and the spiral pipe 18 is embedded into straight pipe groove 6, and the spiral pipe 18 is screwed with air pipe 19, and the straight pipe groove 6 and air pipe 19 are poured with sealing filler 20;The air pipe 19 top is screwed with flow deflector 21.

[0040] Pressure gas is filled between air pressure plate 15 and airtight storehouse 4, and the pressure gas is closed in the travel range of valve plate 7, can prevent the position of valve body 1 and valve stem 9 from leaking, when valve plate 7 continuously goes down, the gate valve is closed, air pressure plate 15 is driven by valve stem 9, and is synchronously pressed down, air pressure plate 15 pressurizes airtight storehouse 4 to complete air pressure closure, at the same time, the pressure gas is punched into annular air bag 17;Annular air bag 17 can pressurize and close valve plate 7.

[0041] Before use, first rotate the air pressure plate 15 to the high position; then inflate the gate valve, fill compressed gas into the air pressure adjusting chamber 11 through the air nozzle 12, the compressed gas is air or inert gas, the gas enters the air pressure adjusting chamber 11 and enters the air-tight chamber 4, the pressure gas in the air-tight chamber 4 performs full-range air pressure sealing on the travel range of the valve plate 7, when inflating, the pressure value is monitored in real time through the pressure transmitter 10, when the pressure value reaches the set value, stop inflating; at this time, the compressed air in the air-tight chamber 4 seals the valve plate 7 and the valve body 1 in place; when the gate valve is closed, rotate the handle, the handle drives the valve rod 9 to rotate, the valve rod 9 drives the valve plate 7 to move linearly downward through the screw nut 8, when the valve plate 7 moves downward, since the air pressure adjusting chamber 11 has an oval structure in the transverse section, the air pressure plate 15 cannot rotate circumferentially, when the valve rod 9 rotates, the valve rod 9 synchronously drives the air pressure plate 15 to move linearly downward, when the air pressure plate 15 moves downward, the air pressure plate 15 compresses the compressed gas in the air pressure adjusting chamber 11, the compressed gas compresses the air-tight chamber 4 and is pressed into the flow guide cover 21, the compressed air continues to be punched into the air pipe 19, and the compressed air continues to be punched into the annular air bag 17 through the air pipe 19 and the spiral pipe 18, when the valve plate 7 continues to move downward, the annular air bag 17 continues to pressurize the valve plate 7, when the valve plate 7 moves to the position, the annular air bag 17 can complete the pressurization and sealing of the valve plate 7; so as to ensure the sealing performance after the gate plate is closed;

[0042] When the gate valve is opened, the handle is rotated in the opposite direction, the handle drives the valve rod 9 to rotate, the valve rod 9 drives the valve plate 7 to move linearly upward through the screw nut 8, the valve plate 7 moves upward, at this time, the valve rod 9 synchronously drives the air pressure plate 15 to move linearly upward, when the air pressure plate 15 moves upward, the space connected by the air pressure adjusting chamber 11 and the air-tight chamber 4 becomes larger, so that the pressure of the space is reduced, and since the valve plate 7 dynamically extrudes the annular air bag 17, and since the annular air bag 17 is connected with the air-tight chamber 4, the pressure of the annular air bag 17 is reduced, at this time, the friction between the annular air bag 17 and the valve plate 7 is reduced; the valve plate 7 can be smoothly lifted, so that the inlet 2 and the outlet 3 of the valve body 1 are connected;

[0043] Air-tight alarm, when the pressure transmitter 10 monitors that the pressure is lower than the set value, an air-tight leakage alarm is issued.

[0044] The valve stem 9 comprises an upper stem section 22, an intermediate stem section 23 and a lower stem section 24 which are integrally formed, the outer diameter of the intermediate stem section 23 is larger than that of the upper stem section 22 and the lower stem section 24; the bottom of the air pressure adjusting bin 11 is fixed with a bottom disc 25; a plurality of air holes 26 are formed in the bottom disc 25; a guide bearing is arranged at the center of the bottom disc 25, the lower stem section 24 penetrates through the guide bearing, and the intermediate stem section 23 is attached to the top surface of the bottom disc 25; the upper stem section 22 is screwed with the air pressure plate 15, and the lower stem section 24 is screwed with the nut 8; the valve stem 9 moves through the guide bearing which is supported by the bottom disc 25, and when the valve stem 9 rotates, it rotates more stably through the guide bearing; the bottom disc 25 can support the guide bearing, and the air pressure adjusting bin 11 and the air-tight bin 4 are communicated through the air holes 26 of the bottom disc 25; the upper stem section 22 of the valve stem 9 can drive the air pressure plate 15 to move linearly, and the lower stem section 24 of the valve stem 9 can drive the valve plate 7 to move linearly; the intermediate stem section 23 and the bottom disc 25 cooperate to realize the axial positioning of the valve stem 9 and the bottom disc 25.

[0045] The top of the lower stem section 24 is sleeved with a limiting sleeve 27 below the bottom disc 25; the limiting sleeve 27 is fastened with the lower stem section 24 by bolts; the valve stem 9 is axially positioned by the limiting sleeve 27 and the intermediate stem section 23 to prevent the valve stem 9 and the valve plate 7 from being separated from the valve body 1.

[0046] The pressure transmitter 10 is connected to a controller, and the controller is connected to an alarm; the pressure transmitter 10 monitors the pressure value of the air-tight bin 4 in real time and sends the pressure value to the controller; when the difference between the pressure value and the set value is calculated, and the calculation result is greater than the set threshold value, the controller sends a signal to the alarm, and the alarm alarms.

[0047] A rotary encoder is embedded and fixed at the inside top of the sealing pipe section 13, and the valve stem 9 penetrates through the rotary end of the rotary encoder and is fixed with the rotary end; the rotary encoder is connected to a controller; when the valve stem 9 operates, the valve stem 9 rotates, the valve stem 9 transmits the rotary force to the rotary encoder, the rotary encoder collects the number of rotations of the valve stem 9 and sends the number of rotations to the controller; the controller determines the opening state of the valve plate 7 and the position of the air pressure plate 15 according to the rotation direction and the number of rotations; since the air pressure plate 15 compresses the gas filled in the air nozzle 12, the pressure value is monitored in real time by the pressure transmitter 10 during compression; the controller calculates the difference between the real-time collected pressure value and the set pressure value corresponding to the position of the air pressure plate 15; when the difference exceeds the set value, the controller sends a signal to the alarm, and the alarm issues a gate valve leakage alarm.

[0048] The valve body 1 has guide rails 28 integrally formed on both sides of the liquid inlet 2 and the liquid outlet 3; the outer surface of the valve plate 7 is provided with a sliding groove that slides and engages with the guide rails 28. When the valve body 1 is opened and closed, the valve plate 7 has better linearity of movement through the sliding groove of the valve body 1 and the guide rails 28. When the valve body 1 and the valve plate 7 are sealed, the valve plate 7 has stronger impact resistance and deformation resistance.

[0049] The bottom of the pressure regulating chamber 11 is integrally formed with a lower edge 29, which is embedded in the inner side of the airtight chamber 4. A second sealing ring is provided on the outer wall of the lower edge 29 and the inner wall of the airtight chamber 4. The pressure regulating chamber 11 can be assembled with the airtight chamber 4 as one unit through the lower edge 29, and the second sealing ring can achieve a good sealing effect by sealing the lower edge 29 and the airtight chamber 4.

[0050] The valve body 1 has a valve plate receiving groove 30 located on the bottom inner side of the valve plate 7. When the bottom of the valve plate 7 enters the valve plate receiving groove 30, the valve plate 7 can provide sufficient air pressure to the annular airbag 17 during its downward movement to the valve plate receiving groove 30, thereby continuously pressurizing the annular airbag 17 and achieving high-pressure sealing of the valve plate 7 by the annular airbag 17.

[0051] Example 2:

[0052] like Figure 8 The wellhead gate valve shown is used for oil extraction. A bypass pipeline is provided between the top and bottom of the pressure regulating chamber 11. An electrically controlled on / off valve 32 is provided on the bypass pipeline. When the valve plate 7 needs to be opened, the electrically controlled on / off valve 32 is opened. At this time, the upper and lower parts of the pressure plate 15 are connected through the bypass pipeline. The pressurized gas in the airtight chamber 4 quickly enters the upper part of the pressure plate 15, thereby quickly depressurizing the airtight chamber 4 and the annular airbag 17. The friction is small when the valve plate 7 is open. When the pressure plate 15 moves upward to the position, the electrically controlled on / off valve 32 is closed. When the pressure plate 15 moves downward again, the bypass pipeline is closed. At this time, the airtight chamber 4 and the annular airbag 17 are continuously pressurized. While the pressure plate 15 pressurizes and seals the airtight chamber 4, pressurized gas is injected into the annular airbag 17. The annular airbag 17 can pressurize and seal the valve plate 7.

[0053] The above embodiments are merely preferred embodiments of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model are included within the scope of the present utility model.

Claims

1. A wellhead gate valve for oil production, characterized by: The utility model provides a valve body, the valve body both ends opposite setting has the liquid inlet and the liquid outlet, the valve body upper end integral has the airtight storehouse, the valve body inside to the liquid inlet and the liquid outlet periphery is provided with ring groove, the ring groove and airtight storehouse between open has straight pipe groove, valve core subassembly, valve core subassembly includes the valve plate inlaying valve body inside, the valve plate top surface is fixed with the screw mother, the screw mother is screwed on the valve rod, the valve plate inside is provided with valve rod accommodating groove, pressure transmitter, pressure transmitter inlaying airtight storehouse inside, and with airtight storehouse fixed, double seal ware, double seal ware includes fixed airtight storehouse top, and the bottom hollow air pressure regulating storehouse, the air pressure regulating storehouse is fixed with the air cock on, the air pressure regulating storehouse transverse section is elliptical structure, the air pressure regulating storehouse top integral has made has sealed pipe section, the sealed pipe section top is fixed with the sealing plate, the air pressure regulating storehouse inside is provided with air pressure plate, the air pressure plate is screwed on the valve rod upper portion, the valve rod top movable passes through sealed pipe section and sealing plate, and is fixed with the shake hand, the sealed pipe section and valve rod between are provided with first sealing ring, air -tight component, air -tight component includes the annular air bag of sticking fixed ring groove inside, the annular air bag is fixed with the screw pipe, the screw pipe is embedded to straight pipe groove, the screw pipe is screwed on the air pipe, straight pipe groove and air pipe between pouring have sealing filler, the air pipe top is screwed on the flow guide cover. The valve rod includes an integrally formed upper rod section, an intermediate rod section, and a lower rod section. The outer diameter of the intermediate rod section is greater than the outer diameters of the upper rod section and the lower rod section. The bottom of the air pressure regulating storehouse is fixed with a bottom disc. A plurality of air holes are formed in the bottom disc. A guide bearing is arranged at the center of the bottom disc. The lower rod section passes through the guide bearing, and the intermediate rod section is attached to the top surface of the bottom disc. The upper rod section is screwed with the air pressure plate, and the lower rod section is screwed with the screw mother. The top of the lower rod section is sleeved with a limiting sleeve below the bottom disc. The limiting sleeve is fastened with the lower rod section by bolts. The pressure transmitter is connected to a controller, and the controller is connected to an alarm. A rotary encoder is inlaid and fixed inside the top of the sealed pipe section. The valve rod passes through the rotary end of the rotary encoder and is fixed with the rotary end. The rotary encoder is connected to the controller. The valve body is integrally formed with guide rail bodies on both sides of the liquid inlet and the liquid outlet. The outer surface of the valve plate is provided with a sliding groove that slidably cooperates with the guide rail bodies. The bottom of the air pressure regulating storehouse is integrally formed with a lower edge portion that is inlaid inside the airtight storehouse. The outer wall of the lower edge portion and the inner wall of the airtight storehouse are provided with a second sealing ring. The inside bottom of the valve body is provided with a valve plate accommodating groove opposite to the valve plate.

2. The wellhead gate valve for oil production according to claim 1, characterized in that: A bypass pipeline is arranged between the top and the bottom of the air pressure regulating storehouse. An electrically controlled on-off valve is arranged on the bypass pipeline.

3. A gate valve for use in oil production according to claim 2, characterised in that: ​ 4. The gate valve for use in oil production according to claim 1, characterized in that: ​ 5. The gate valve for use in oil production according to claim 1, characterized in that: ​ 6. The gate valve for use in oil production according to claim 1, characterized in that: ​ 7. The gate valve for use in oil production according to claim 1, characterized in that: ​ 8. The gate valve for use in oil production according to claim 1, characterized in that: ​ 9. The gate valve for use in oil production according to claim 1, characterized in that: ​

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