CN212226119U

CN212226119U - Pressure regulating valve with strong sealing performance

Info

Publication number: CN212226119U
Application number: CN202020528902.3U
Authority: CN
Inventors: 郭治中
Original assignee: Ito F Energy Equipment Corp
Current assignee: Ito F Energy Equipment Corp
Priority date: 2020-04-10
Filing date: 2020-04-10
Publication date: 2020-12-25
Anticipated expiration: 2030-04-10

Abstract

The utility model relates to an air-vent valve with strong sealing performance, which comprises a valve body and a valve head part, wherein the valve head part is provided with a driving assembly, the driving assembly comprises an adjusting screw, an upper cover plate and a lower cover plate which are abutted against the lower end of the adjusting screw, and a control spring arranged between the upper cover plate and the lower cover plate, an air chamber and a vent pipe which is arranged below the air chamber and is communicated with the air chamber are arranged in the valve body, a diaphragm is arranged in the air chamber, the lower cover plate is abutted against the upper surface of the diaphragm, at least two second guide plates are vertically arranged on the lower cover plate, the second guide plates are in sliding connection with the inner wall of an adjusting groove of the valve head part, a valve rod is penetrated in the vent pipe, one end of the valve rod is provided with an end cover, the other end of the valve rod is provided with a piston, the end cover, and a return spring is arranged at the bottom of the piston. The utility model discloses have the strong effect of leakproofness.

Description

Pressure regulating valve with strong sealing performance

Technical Field

The utility model belongs to the technical field of the technique of air-vent valve and specifically relates to an air-vent valve that leakproofness is strong.

Background

The pressure regulating valve is a valve which can reduce the inlet pressure to a certain required outlet pressure by regulation and can automatically keep the outlet pressure stable by means of the energy of a medium. The valve core of the pressure regulating valve is controlled by a diaphragm, a spring force acts downwards above the diaphragm, a fluid pressure acts upwards below the diaphragm, when no water flows at the outlet, the pressure at the inlet and the outlet is the same instantly, at the moment, the pressure acting below the diaphragm is larger than the spring force, the diaphragm moves upwards, the valve is closed, and the outlet pressure is kept at a set value. When water is used at the downstream, the outlet pressure is reduced, the diaphragm opens the pressure reducing valve under the action of the spring force until the water pressure and the spring force are balanced, the pressure reducing valve is opened stably at the moment, certain liquid resistance is generated, and the outlet pressure is kept at a fixed value.

Chinese patent with publication number CN209414629U discloses a gas pressure regulating valve, which comprises a valve body, the fixed inferior valve connecting piece that is equipped with in top of valve body, the fixed diaphragm inferior valve that is equipped with in top of inferior valve connecting piece, the fixed diaphragm epitheca that is equipped with in top of diaphragm inferior valve, the fixed diaphragm that is equipped with between diaphragm inferior valve and the diaphragm epitheca, the fixed epitheca connecting piece that is equipped with in top of diaphragm epitheca, the fixed regulation section of thick bamboo that is equipped with in top of epitheca connecting piece, the inside of adjusting the section of thick bamboo is equipped with the regulation control spring, the fixed regulation cap that is equipped with in top of adjusting the section of thick bamboo, the inside threaded connection of screw hole has the regulation pole.

Above-mentioned technical scheme, the one end of valve rod is passed the diaphragm and is connected bottom the tray, and the bottom of control spring is being connected on tray upper portion, drives reciprocating of tray through control spring to drive reciprocating of valve rod, the valve rod bottom is connected with the valve piece, and the valve rod drive valve piece reciprocates and controls the degree of opening and shutting of valve. However, in the above technical scheme, the diaphragm plays both a sealing role and a linkage role, and in the actual use process, the diaphragm can repeatedly move up and down due to the continuous change of the air pressure of the air inlet and the air outlet, and the valve rod penetrates through the diaphragm to reduce the strength of the diaphragm and reduce the sealing performance between the valve rod and the diaphragm.

SUMMERY OF THE UTILITY MODEL

To the not enough that prior art exists, the utility model aims at providing a strong air-vent valve of leakproofness.

The above technical purpose of the present invention can be achieved by the following technical solutions: a pressure regulating valve with strong sealing performance comprises a valve body and a valve head part, wherein two ends of the valve body are respectively communicated with an air inlet channel and an air outlet channel, the valve head part is provided with a driving assembly, an air chamber and a vent pipe are arranged inside the valve body, the vent pipe is communicated with the air chamber and arranged below the air chamber, the vent pipe and the driving assembly are arranged on the same vertical straight line, the air chamber is communicated with the air outlet channel, the vent pipe is communicated with the air inlet channel, a diaphragm is arranged in the air chamber, a valve rod is coaxially penetrated in the vent pipe, one end of the valve rod extends into the air chamber, an end cover is coaxially and fixedly connected with the end part of the valve rod, the upper surface of the end cover is fixedly connected with the lower surface of the diaphragm, at least two first guide plates are vertically arranged on the end cover, the first guide plates extend into the vent pipe, and the, the end, far away from the end cover, of the valve rod is coaxially and fixedly connected with a piston, the piston is positioned below the vent pipe, a return spring is arranged below the piston, a spring chamber is arranged at the bottom of the valve body, and one end, far away from the piston, of the return spring is fixedly connected with the spring chamber;

the driving assembly comprises an adjusting screw rod, an upper cover plate, a control spring and a lower cover plate which are coaxially arranged, the adjusting screw rod is arranged in a threaded hole of the valve head, the lower end of the adjusting screw rod is abutted to the upper cover plate, the control spring is arranged between the upper cover plate and the lower cover plate, one end of the control spring is fixedly connected with the upper cover plate, the other end of the control spring is fixedly connected with the lower cover plate, the lower cover plate is abutted to the upper surface of the diaphragm, at least two second guide plates are vertically arranged on the lower cover plate, an adjusting groove is formed in the top end of the inner wall of the valve head, the adjusting screw rod extends into the adjusting groove, the circumferential side wall of the upper cover plate is abutted to the inner wall of the adjusting groove, the second guide plates extend into the adjusting groove, and the side wall of each second;

the lower cover plate is coaxially arranged with the end cover, and the lower cover plate is abutted to the diaphragm at the position of the end cover.

Through adopting above-mentioned technical scheme, during gas got into the valve body from inlet channel, then got into air chamber and outlet channel from the breather pipe. Before ventilating, operating personnel can set for the elasticity of control spring through rotatory adjusting screw, with this pressure of setting for the exhaust gas in the air outlet channel, in the in-process of ventilating, when the user closes the pneumatic valve on the air outlet pipe or adjusts when little, atmospheric pressure in air chamber and the air outlet channel can increase in the twinkling of an eye, atmospheric pressure in air chamber and the air outlet channel is greater than the elasticity of control spring, the diaphragm can be by jack-up upwards this moment, the end cover can be in the same place through mode fixed connection such as gluing with the diaphragm lower surface, so the end cover also can upwards move, piston and breather pipe bottom gap diminish this moment, make the circulation of gas diminish, atmospheric pressure and spring force in air chamber and the air outlet channel are balanced, relief valve stable opening this moment, thereby reach the purpose of reducing atmospheric pressure in the air outlet channel. When the pneumatic valve on the outlet duct was opened or was opened greatly, the atmospheric pressure in air chamber and the air outlet channel reduces gradually, the atmospheric pressure in air chamber and the air outlet channel is less than the elasticity of spring, the diaphragm can be pushed down this moment, make piston and breather pipe bottom separate gradually, thereby make the gaseous circulation grow that gets into in air chamber and the air outlet channel, it is balanced with spring elasticity to atmospheric pressure in air chamber and the air outlet channel, the relief pressure valve is stably opened this moment, atmospheric pressure in air chamber and the air outlet channel can stably reach the setting value. In the process that the diaphragm moves up and down, the reset spring is always in a compression state, and when the diaphragm moves upwards, the reset spring jacks up the end cover, so that the pulling force of the diaphragm on the end cover is reduced, and the end cover and the diaphragm can be connected together more stably. The first guide plate on the end cover and the second guide plate on the lower cover plate can respectively slide up and down along the vent pipe and the inner wall of the valve head part in the process that the diaphragm moves up and down, so that the end cover and the lower cover plate can be positioned on the same vertical line. The valve rod need not to pass the diaphragm and be connected with drive assembly, just can realize drive assembly and drive the valve rod and reciprocate to the gaseous pressure value in the control passageway of giving vent to anger, not only can improve the intensity of diaphragm like this and can also strengthen the leakproofness of diaphragm department.

The present invention may be further configured in a preferred embodiment as: and a first sealing ring is arranged on the side wall of the upper cover plate and is abutted against the inner wall of the adjusting groove.

Through adopting above-mentioned technical scheme, when the diaphragm department appears the fracture line, the gas can pass the diaphragm and enter into valve head portion, and the sealing ring on the upper cover plate lateral wall and valve head portion inner wall looks butt can play sealed effect this moment, prevents that the gas from leaking and producing the potential safety hazard from the valve head portion.

The present invention may be further configured in a preferred embodiment as: the bottom of the upper cover plate is provided with a first spring positioning wall, the upper surface of the lower cover plate is provided with a second spring positioning wall, and two ends of the control spring are respectively positioned in the first spring positioning wall and the second spring positioning wall.

Through adopting above-mentioned technical scheme, first spring location wall and second spring location wall can play the location and the guide effect to control spring, prevent that control spring from taking place the skew at flexible in-process, influencing control spring's elasticity value to influence the degree of accuracy of air-vent valve.

The present invention may be further configured in a preferred embodiment as: the control spring is internally coaxially provided with a telescopic rod in a penetrating way, one end of the telescopic rod is fixedly connected with the upper cover plate, and the other end of the telescopic rod is fixedly connected with the lower cover plate.

By adopting the technical scheme: the telescopic link can prevent that control spring from taking place to buckle at tensile and compressed in-process for control spring's elasticity value changes, thereby influences the degree of accuracy of air-vent valve.

The present invention may be further configured in a preferred embodiment as: and the edge angle of one end of the lower cover plate, which is close to the diaphragm, and the edge angle of one end of the end cover, which is close to the diaphragm, are arranged to be arc chamfers.

Through adopting above-mentioned technical scheme, can prevent down apron and end cover pressure when the diaphragm surface reciprocates, apron and end cover are close to the edges and corners of diaphragm wearing and tearing even break off down.

The present invention may be further configured in a preferred embodiment as: the valve comprises a valve head, and is characterized in that a valve cover is arranged on the valve head, a step surface is arranged at the top end of the valve head, and the valve cover is in threaded connection with the step surface.

Through adopting above-mentioned technical scheme, after operating personnel adjusted control spring's elasticity through rotatory adjusting screw, with the valve gap lid on the valve head portion, can prevent that the dust from blocking the screw hole of valve head portion for adjusting screw is difficult to rotate, can also prevent that the air-vent valve is at the in-process of work, and someone from touching adjusting screw by mistake, makes the degree of accuracy of air-vent valve receive the influence.

The present invention may be further configured in a preferred embodiment as: and a second sealing ring is arranged on the step surface.

Through adopting above-mentioned technical scheme, when the valve gap was screwed up on the valve head portion, the sealing ring can play sealed effect, prevents that the gas from leaking, also can prevent steam in the air, and the screw hole on the valve head portion is blocked in the valve gap is entered into to dust etc to make adjusting screw be difficult to the rotating.

The present invention may be further configured in a preferred embodiment as: the piston upper surface is provided with the concave ring, breather pipe and concave ring grafting cooperation, the inside rubber ring that is provided with of concave ring.

Through adopting above-mentioned technical scheme, when the valve on the outlet duct was closed, gas did not flow in the outlet duct, and atmospheric pressure in the air outlet channel increases in the twinkling of an eye, and the pressure that acts on under the diaphragm this moment is greater than spring force, and the diaphragm can drive piston rebound this moment, and the rubber ring in the vent pipe bottom inserts the concave ring above the piston, and the rubber ring in the concave ring can play sealed effect, prevents that the high-pressure gas in the inlet channel from continuing to enter into air outlet channel and arouse the potential safety hazard.

To sum up, the utility model discloses a following at least one useful technological effect:

1. through the fixed connection of the diaphragm and the end cover, the abutting of the lower cover plate and the diaphragm and the arrangement of the reset spring, the valve rod can drive the valve rod and the piston to move up and down together without penetrating through the diaphragm, so that the effects of strength and sealing performance of the diaphragm are improved;

2. the first guide plate and the second guide plate are arranged, so that the end cover and the lower cover plate cannot deviate or be misplaced in the moving process;

3. through the setting of first sealing ring, rubber ring and second sealing ring, can play abundant sealed effect that prevents the gas and leak.

Drawings

FIG. 1 is a sectional view of the overall construction of a pressure regulating valve;

FIG. 2 is a sectional view of the construction of the pressure regulating valve when closed;

fig. 3 is an enlarged view of a portion a of the structure of fig. 2.

In the figure, 1, a valve body; 2. a valve head portion; 21. an adjustment groove; 3. an air intake passage; 4. an air outlet channel; 5. a drive assembly; 51. adjusting the screw rod; 52. an upper cover plate; 521. a first spring positioning wall; 522. a first seal ring; 53. a control spring; 531. a telescopic rod; 54. a lower cover plate; 541. a second guide plate; 542. a second spring positioning wall; 6. an air chamber; 61. a membrane; 7. a breather pipe; 8. a valve stem; 81. an end cap; 811. a first guide plate; 82. a piston; 821. a concave ring; 822. a rubber ring; 9. a valve cover; 10. a second seal ring; 11. a return spring; 12. a spring chamber; 13. a step surface.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, for the utility model discloses a strong air-vent valve of leakproofness, including valve body 1 and valve head portion 2, 1 both ends of valve body communicate respectively has inlet channel 3 and air outlet channel 4, and the high-pressure gas in the inlet channel 3 lets in valve body 1, then discharges from air outlet channel 4 after 1 steps down through the valve body.

Referring to fig. 1, an air chamber 6 and a vent pipe 7 are arranged in a valve body 1, the vent pipe 7 is communicated with an air inlet channel 3, the vent pipe 7 is arranged below the air chamber 6 and is communicated with the air chamber 6, the air chamber 6 is communicated with an air outlet channel 4, and the air inlet channel 3 and the air outlet channel 4 are respectively communicated with an air inlet pipeline and an air outlet pipeline. The high-pressure gas firstly enters the air inlet channel 3 from the air inlet pipeline, then enters the breather pipe 7, then enters the air chamber 6, and finally is discharged into the air outlet pipeline from the air outlet channel 4.

Referring to fig. 1, the valve head 2 is provided with a driving assembly 5, the driving assembly 5 includes an adjusting screw 51, an upper cover plate 52, a control spring 53 and a lower cover plate 54 which are coaxially arranged, the adjusting screw 51 is arranged in a threaded hole of the valve head 2, the lower end of the adjusting screw 51 is abutted against the upper surface of the upper cover plate 52, the control spring 53 is arranged between the upper cover plate 52 and the lower cover plate 54, and two ends of the control spring 53 are fixedly connected with the upper cover plate 52 and the lower cover plate 54.

Referring to fig. 1, a diaphragm 61 is arranged in an air chamber 6, the upper surface of the diaphragm 61 abuts against a lower cover plate 54, a valve rod 8 is coaxially arranged in a vent pipe 7, a coaxial end cover 81 is arranged at one end, close to the diaphragm 61, of the valve rod 8, the end cover 81 and the lower surface of the diaphragm 61 are fixedly connected together in an adhesive mode or the like, a coaxial piston 82 is arranged at the other end of the valve rod 8, a coaxial return spring 11 is arranged at the bottom of the piston 82, one end, far away from the piston 82, of the return spring 11 is fixedly

Referring to fig. 2, when the air valve on the air outlet pipeline is closed or turned off, the air pressure in the air chamber 6 and the air outlet channel 4 is increased instantaneously, the air pressure in the air chamber 6 and the air outlet channel 4 is greater than the elastic force of the control spring 53, at this time, the membrane 61 is jacked upwards, the membrane 61 drives the valve rod 8 to move upwards, so that the piston 82 and the vent pipe 7 are gradually close to each other, the flow rate of the air entering the air chamber 6 and the air outlet channel 4 is reduced, the air pressure in the air chamber 6 and the air outlet channel 4 is reduced until the air pressure in the air chamber 6 and the air outlet channel 4 is balanced with the elastic force of the control spring 53, and the pressure reducing valve is stably opened, thereby.

Referring to fig. 1, when the gas valve on the gas outlet pipeline is opened or opened, the gas flowing pressure in the gas chamber 6 and the gas outlet channel 4 is reduced, the gas pressure in the gas chamber 6 and the gas outlet channel 4 is less than the elastic force of the control spring 53, at this time, the diaphragm 61 is pressed downwards, the diaphragm 61 pushes the valve rod 8 to move downwards, so that the piston 82 is gradually separated from the bottom of the gas pipe 7, the flow rate of the gas entering the gas chamber 6 and the gas outlet channel 4 is increased, the gas pressure in the gas chamber 6 and the gas outlet channel 4 is gradually increased until the gas pressure in the gas chamber 6 and the gas outlet channel 4 is balanced with the elastic force of the control spring 53, at this time, the pressure reducing valve is stably opened, and the gas pressure in the gas chamber.

Referring to fig. 1, the valve head 2 is provided with an adjusting groove 21, the lower cover plate 54 is vertically provided with at least two second guide plates 541, the second guide plates 541 extend into the adjusting groove 21, and the side walls of the second guide plates 541 abut against the inner wall of the adjusting groove 21. Two ends of the end cover 81 are vertically provided with at least two first guide plates 811, the side walls of the first guide plates 811 are abutted against the inner wall of the breather pipe 7, and the end cover 81 and the lower cover plate 84 are coaxially arranged. The first guide plate 811 and the second guide plate 541 can slide along the air pipe 7 and the inner wall of the adjusting groove 21 respectively, and have a guiding and positioning function, so that the end cover 81 and the lower cover plate 54 are always in the same vertical line, and thus the driving assembly 5 can better drive the piston 82 to ascend and descend, and the accuracy of the adjusting valve is improved.

Referring to fig. 1, the return spring 11 is always in a compressed state, and when the diaphragm 61 moves upwards with the end cap 81, the return spring 11 can lift the end cap 81 upwards, so as to reduce the pulling force of the diaphragm 61 on the end cap 81, thereby making the connection between the diaphragm 61 and the end cap 81 more stable. The valve rod 8 does not need to penetrate through the membrane 61 to be connected with the driving assembly 5, and the driving assembly 5 can drive the valve rod 8 to move up and down together, so that the strength of the membrane 61 and the sealing performance of the membrane 61 can be improved.

Referring to fig. 1, an adjusting screw 51 is provided in a threaded hole of a valve head 2, one end of the adjusting screw 51 extends into an adjusting groove 21 and abuts against the upper surface of an upper cover plate 52, and before the pressure regulating valve is ventilated, an operator can set the pressure value of the gas discharged from the gas outlet passage 4 by rotating the adjusting screw 51 to adjust the elastic force of a control spring 53.

Referring to fig. 1, a first sealing ring 522 is disposed on a side wall of the upper cover plate 52, the first sealing ring 522 abuts against an inner wall of the valve head 2, when the diaphragm 61 is broken, gas can enter the valve head 2 from the gas chamber 6, and the first sealing ring 522 can prevent the gas from passing through the upper cover plate 52 and then leaking out of a threaded hole of the valve head 2.

Referring to fig. 1, a first spring positioning wall 521 is disposed at the bottom of the upper cover plate 52, a second spring positioning wall 542 is disposed on the upper surface of the lower cover plate 54, the control spring 53 is disposed between the first spring positioning wall 521 and the second spring positioning wall 542, an expansion link 531 is coaxially disposed in the control spring 53, and two ends of the expansion link 531 are respectively fixedly connected to the upper cover plate 52 and the lower cover plate 54. Therefore, the situations that the control spring 53 is bent and dislocated in the process of vertical expansion and contraction due to pressure change can be prevented, and the accuracy of the valve is influenced.

Referring to fig. 1, the lower surface of the lower cover plate 54 is provided with the arc chamfers at the periphery, and the upper surface of the end cover 81 is provided with the arc chamfers at the periphery, so that the parts of the membrane 61, the lower cover plate 54 and the end cover 81, which are in contact with each other at the periphery, are not easily worn or broken.

Referring to fig. 1, a concave ring 821 is arranged on the upper surface of the piston 82, the bottom end of the vent pipe 7 can be inserted into the concave ring 821, a rubber ring 822 is arranged in the concave ring 821, when the air valve on the vent pipe is closed, the air pressure in the vent passage 4 is rapidly increased, at this time, if high-pressure gas in the air inlet passage 3 still flows into the vent pipe from a gap between the piston 82 and the vent pipe 7, a safety hazard can be generated, when the air pressure in the vent passage 4 is too high, the air pressure can drive the diaphragm 61 to move upwards, so that the piston 82 moves upwards, at this time, the vent pipe 7 can be inserted into the concave ring 821 on the piston 82, and the rubber ring 822 in the concave ring 821 can play a role in sealing, and prevent the gas from continuously entering the vent passage 4.

Referring to fig. 3, a valve cap 9 is disposed on the valve head 2, a step surface 13 is disposed on the upper surface of the valve head 2, threads are disposed on the side wall of the step surface 13, threads are also disposed on the inner wall of the valve cap 9, and the valve cap 9 is in threaded connection with the valve head 2. Referring to fig. 2, the valve cover 9 protects the adjusting screw 51, and prevents the pressure regulating valve from accidentally touching the adjusting screw 51 during operation, thereby affecting the elastic force value set by the control spring 53 and further affecting the gas pressure value in the gas outlet channel 4. The second sealing ring 10 is arranged on the surface of the valve head 2 connected with the valve cover 9, the second sealing ring 10 can prevent water vapor and dust from entering the valve cover 9, and then the threaded hole is blocked, so that the adjusting screw 51 is difficult to rotate.

The implementation principle of the embodiment is as follows: before ventilation, an operator sets the elastic force value of the control spring 53 by rotating the adjusting screw 51, then screws the valve cover 9 to ensure that the gas pipeline is tightly connected with the gas inlet channel 3 and the gas outlet channel 4, then introduces high-pressure gas into the valve body 1, the high-pressure gas is decompressed through the valve body 1 and then is discharged from the gas outlet channel 4, when the gas pressure of the gas outlet channel 4 needs to be adjusted, the operator opens the valve cover 9, then rotates the adjusting screw 51 to set the elastic force value of the control spring 53 again to enable the gas pressure in the gas outlet channel 4 to reach a desired value, and screws the valve cover 9 on the valve head 2 after adjustment is finished.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. A pressure regulating valve with high sealing performance comprises a valve body (1) and a valve head part (2), wherein two ends of the valve body (1) are respectively communicated with an air inlet channel (3) and an air outlet channel (4), and the valve head part (2) is provided with a driving assembly (5);

the method is characterized in that: the air-conditioning valve is characterized in that an air chamber (6) and an air pipe (7) are arranged inside the valve body (1), the air pipe (7) is communicated with the air chamber (6) and is arranged below the air chamber (6), the air pipe (7) and the driving assembly (5) are on the same vertical straight line, the air chamber (6) is communicated with the air outlet channel (4), the air pipe (7) is communicated with the air inlet channel (3), a diaphragm (61) is arranged in the air chamber (6), a valve rod (8) coaxially penetrates through the air pipe (7), one end of the valve rod (8) extends into the air chamber (6) and is coaxially and fixedly connected with an end cover (81) at the end part, and the upper surface of the end cover (81) is fixedly connected with the lower surface of the diaphragm (61);

the valve body is characterized in that at least two first guide plates (811) are vertically arranged on the end cover (81), the first guide plates (811) extend into the vent pipe (7), the side walls of the first guide plates (811) are abutted against the inner wall of the vent pipe (7), one end, far away from the end cover (81), of the valve rod (8) is coaxially and fixedly connected with a piston (82), the piston (82) is located below the vent pipe (7), a return spring (11) is arranged below the piston (82), a spring chamber (12) is arranged at the bottom of the valve body (1), and one end, far away from the piston (82), of the return spring (11) is fixedly connected with the spring chamber (12);

the driving assembly (5) comprises an adjusting screw rod (51), an upper cover plate (52), a control spring (53) and a lower cover plate (54) which are coaxially arranged, the adjusting screw rod (51) is arranged in a threaded hole of the valve head portion (2), the lower end of the adjusting screw rod (51) is abutted to the upper cover plate (52), the control spring (53) is arranged between the upper cover plate (52) and the lower cover plate (54), one end of the control spring (53) is fixedly connected with the upper cover plate, the other end of the control spring is fixedly connected with the lower cover plate (54), and the lower cover plate (54) is abutted to the upper surface of the diaphragm (61);

at least two second guide plates (541) are vertically arranged on the lower cover plate (54), an adjusting groove (21) is formed in the top end of the inner wall of the valve head portion (2), the adjusting screw (51) extends into the adjusting groove (21), the circumferential side wall of the upper cover plate (52) is abutted to the inner wall of the adjusting groove (21), the second guide plates (541) extend into the adjusting groove (21), and the side walls of the second guide plates (541) are abutted to the inner wall of the adjusting groove (21);

the lower cover plate (54) and the end cover (81) are coaxially arranged, and the lower cover plate (54) is abutted to the membrane (61) at the position of the end cover (81).

2. A pressure regulating valve of high sealing performance as claimed in claim 1, wherein: the side wall of the upper cover plate (52) is provided with a first sealing ring (522), and the first sealing ring (522) is abutted to the inner wall of the adjusting groove (21).

3. A pressure regulating valve of high sealing performance as claimed in claim 2, wherein: the bottom of the upper cover plate (52) is provided with a first spring positioning wall (521), the upper surface of the lower cover plate (54) is provided with a second spring positioning wall (542), and two ends of the control spring (53) are respectively positioned in the first spring positioning wall (521) and the second spring positioning wall (542).

4. A pressure regulating valve of high sealing performance as claimed in claim 3, wherein: an expansion rod (531) coaxially penetrates through the control spring (53), one end of the expansion rod (531) is fixedly connected with the upper cover plate (52), and the other end of the expansion rod is fixedly connected with the lower cover plate (54).

5. A pressure regulating valve of high sealing performance as claimed in claim 1, wherein: and the edge angle of one end of the lower cover plate (54) close to the diaphragm (61) and the edge angle of one end of the end cover (81) close to the diaphragm (61) are arranged to be arc chamfers.

6. A pressure regulating valve of high sealing performance as claimed in claim 1, wherein: the valve is characterized in that a valve cover (9) is arranged on the valve head portion (2), a step surface (13) is arranged at the top end of the valve head portion (2), and the valve cover (9) is in threaded connection with the step surface (13).

7. The pressure regulating valve with high sealing performance as claimed in claim 6, wherein: and a second sealing ring (10) is arranged on the step surface (13).

8. The pressure regulating valve with high sealing performance as claimed in claim 6, wherein: the upper surface of the piston (82) is provided with a concave ring (821), the vent pipe (7) is in plug-in fit with the concave ring (821), and a rubber ring (822) is arranged inside the concave ring (821).