CN201636405U - No Leakage Servo Control Pressure Regulating Valve - Google Patents

Abstract

The utility model discloses a pressure adjusting valve with non-leakage and servo control, which comprises a main valve and a pilot valve, wherein the main valve comprises a main valve body, a main valve seat and a main valve core; a balancing cavity is arranged between the main valve and the pilot valve; the pilot valve is provided with a pressure releasing cavity; the balancing cavity is respectively communicated with a medium inlet of the main valve and a medium inlet of the pilot valve; the pressure releasing cavity is communicated with a medium outlet of the main valve; the main valve core is a cone with a smaller lower part and a bigger upper part, and faces the flowing direction of the medium and is opposite to a medium passage of the main valve seat; and the balancing cavity and the pressure releasing cavity are respectively sealed with the outside through static sealing structures. The pressure adjusting valve with non-leakage and servo control utilizes the self-energy of liquid for controlling the opening of the main valve; when the pressure fluctuates in front of or behind the valve, the opening degree of the valve core is changed, thus guaranteeing the pressure of the system to be steadily transited, ensuring the pressure behind the valve to be steady, and being beneficial to normal operation of downstream equipment; and simultaneously, the balancing cavity and the pressure releasing cavity of the pilot valve are sealed with the outside by sealing rings, thus being capable of guaranteeing the medium from being leaked out and being beneficial to saving resources and maintaining sanitary environment when in pressure adjustment and after pressure adjustment.

Description

No Leakage Servo Control Pressure Regulating Valve

technical field

The utility model relates to a pipeline accessory, in particular to a non-leakage servo control pressure regulating valve.

Background technique

The pipeline is an important equipment for conveying medium. In order to adapt to different process conditions and different equipment, it is necessary to decompress or adjust the pressure of the medium in the pipeline to ensure the smooth progress of production.

Pressure regulating valves are widely used as pipeline pressure regulating accessories. In the prior art, the pilot-operated automatic control pressure regulating valve changes the opening degree of the main valve through the energy of the fluid itself, thereby changing the throttling resistance of the main valve, and keeping the outlet pressure basically unchanged. The pilot-operated automatic control pressure regulating valve generally includes a main valve and a pilot valve. The spool of the main valve is located at a position facing away from the channel of the valve seat, and the spool is pushed to open by the driving piston. This pressure regulating valve can better ensure that the outlet pressure does not fluctuate in a large range, and is especially suitable for occasions where the gas medium requires high pressure stability. Moreover, the pressure regulating screw of the existing pressure regulating valve is not designed with sealing measures, and medium leakage will occur during work, especially during installation and commissioning, pulse peak pressure generated by the medium system, equipment maintenance and pressure setting. Leakage is more serious, resulting in waste of resources and environmental pollution. However, the spool of the existing main valve is set against the flow direction of the medium, especially for liquid medium. When the pressure fluctuates sharply, it is easy to cause fatigue fracture at the connection of the spool, which requires shutdown for maintenance and wastes costs.

For pipelines transporting liquids, large pressure fluctuations are undesirable to avoid damage to the pipelines. However, when the diameter of the pipeline behind the valve of the pressure regulating valve is large enough, when the pipeline pressure increases, properly adjusting and increasing or decreasing the flow after the valve can ensure the pressure before and after the valve to be stable, and ensure that the flow after the valve is stable. The pressure is steady.

Therefore, there is a need for an automatic control pressure regulating valve, which can ensure a smooth transition of the system pressure when the pipeline pressure fluctuates, protect the pipeline from being damaged, and ensure that the pressure behind the valve remains stable. At the same time, the pressure regulating valve itself has no leakage , which is conducive to saving resources and maintaining environmental sanitation.

Utility model content

In view of this, the utility model provides a non-leakage servo control pressure regulating valve, which can ensure the smooth transition of the system pressure when the pipeline pressure fluctuates, protect the pipeline from being damaged, and ensure that the pressure behind the valve remains stable. At the same time, The pressure regulating valve itself has no leakage, which is beneficial to saving resources and maintaining environmental sanitation.

The non-leakage servo control pressure regulating valve of the utility model includes a main valve and a pilot valve, the main valve includes a main valve body, a main valve seat and a main valve core, a balance chamber is set between the main valve and the pilot valve, and the pilot valve The valve is equipped with a pressure relief chamber, the balance chamber is respectively connected to the medium inlet of the main valve and the medium inlet of the pilot valve, and the pressure relief chamber is connected to the medium outlet of the main valve. The flow direction is opposite to the medium channel of the main valve seat; the balance chamber and the pressure relief chamber are respectively sealed with the outside world through static sealing structures.

Further, the upper part of the main valve core is provided with a piston that can slide up and down with the valve body, and the piston is driven and matched with the main valve core. The upper end surface of the piston is located in the balance chamber and is provided with a main valve core spring. The spring is set to press the pre-tightening force against the upper end surface of the piston;

Further, the medium inlet of the main valve is connected to the balance chamber through the nozzle;

Further, the pilot valve includes a pilot valve body, a pilot valve core, a pilot valve seat and a pressure regulating assembly; the pilot valve seat is located between the medium inlet of the pilot valve and the pressure relief chamber, and the pressure regulating assembly includes a pressure regulating spring and the pressure-regulating bolt, the pressure-regulating bolt is screwed into the pilot valve body in the vertical direction, one end of the pressure-regulating spring bears against the pressure-regulating bolt, and the other end of the pressure-regulating spring presses against the pilot valve core from top to bottom through the pre-compression force on the pilot valve seat;

Further, the lower end surface of the piston and the upper end surface of the main valve core are driven and connected by a vertically arranged rigid spring;

Further, the pressure regulating assembly further includes an outer cover, which covers the pressure regulating bolt and the pressure regulating spring and is screwed on the pressure regulating bolt through a threaded connection.

Beneficial effects of the utility model: the non-leakage servo control pressure regulating valve of the utility model sets the valve core facing the flow direction of the medium, is suitable for liquid medium, and will not cause fatigue fracture of the valve core due to fluctuations in the pressure of the liquid. The energy of the liquid itself controls the opening of the main valve. When pressure fluctuations occur before or after the valve, the opening degree of the valve core can be changed to buffer the energy generated by the pressure fluctuations and ensure a smooth transition of the system pressure, thereby protecting the pipeline from damage. It also ensures that the pressure behind the valve remains stable, which is beneficial to the normal operation of downstream equipment; at the same time, the balance chamber and pressure relief chamber of the pilot valve are sealed with the outside world by sealing rings, which can ensure no leakage of the medium during and after pressure regulation , which is conducive to saving resources and maintaining environmental sanitation.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

Accompanying drawing is the structural representation of the utility model.

Detailed ways

The accompanying drawing is a schematic structural view of the utility model, as shown in the figure: the non-leakage servo control pressure regulating valve of this embodiment includes a main valve and a pilot valve, and the main valve includes a main valve body 1, a main valve seat 13 and a main valve body. Valve core 2, a balance chamber 14 is set between the main valve and the pilot valve, and the pilot valve is provided with a pressure relief chamber 10, and the balance chamber 14 is respectively connected to the medium inlet 11 of the main valve and the medium inlet 21 of the pilot valve, as shown in the figure , the main valve medium inlet 11 communicates with the balance chamber 14 through the pulse tube 19 and the nozzle 20; the pressure relief chamber 10 communicates with the main valve medium outlet 12, as shown in the figure, the pressure relief chamber 10 communicates with the main valve medium through the pressure relief pipe 15 Outlet 12; the main valve core 2 is tapered with a small bottom and a big top and faces the flow direction of the medium and is opposite to the medium passage of the main valve seat 13; the balance chamber 14 and the pressure relief chamber 10 are respectively sealed with the outside world through a static sealing structure ; As shown in the figure, the static sealing structures of the balance chamber 14 and the pressure relief chamber 10 are the sealing ring 17, the sealing ring 16 and the sealing ring 18, respectively.

In this embodiment, the upper part of the main valve core 2 is provided with a piston 4 that can slide up and down with the valve body 1. The piston 4 is driven and matched with the main valve core 2, and the driving cooperation refers to that the piston 4 moves up and down. Drive the main spool 2 to move up and down to change the degree of opening; the upper end surface of the piston 4 is located in the balance chamber 14 and is provided with a main spool spring 5, and the main spool spring 5 is set to press the pretightening force against the upper end surface of the piston 4; As shown in the figure, an inward boss 1a is arranged on the upper part of the main valve body 1 , one end of the main valve core spring 5 bears on the boss 1a, and the other end bears on the upper end surface of the piston 4 .

In this embodiment, the medium inlet 11 of the main valve is connected to the balance chamber 14 through the nozzle 20; the nozzle 20 can form a jet to accelerate the medium flow rate, open the pilot valve quickly, and enhance the flexibility of the utility model.

In this embodiment, the pilot valve includes a pilot valve body 22, a pilot valve core 6, a pilot valve seat 23 and a pressure regulating assembly. As shown in the figure, the pilot valve core 6 is a ball, and the pilot valve seat 23 is formed by the main valve body. 1 The inward boss 1a provided on the upper part is formed with a simple and compact structure; the pilot valve seat 23 is located between the pilot valve medium inlet 21 and the pressure relief chamber 10, and the pressure regulating assembly includes a pressure regulating spring 9 and a pressure regulating bolt 7. The pressure regulating bolt 7 is screwed into the pilot valve body 22 in the vertical direction, one end of the pressure regulating spring 9 bears against the pressure regulating bolt 7, and the other end of the pressure regulating spring 9 withstands the pilot valve core 6 from top to bottom through the precompression force. It rests on the pilot valve seat 23;

In this embodiment, the lower end surface of the piston 4 and the upper end surface of the main valve core 2 are driven and connected by a vertical rigid spring 3; when the medium actively drives the main valve core 2, the buffer effect of the rigid spring 3 ensures that the piston 4 runs smoothly, and does not require high coaxiality to prevent the piston 4 from getting stuck.

In this embodiment, the pressure regulating assembly also includes an outer cover 8, which covers the pressure regulating bolt 7 and the pressure regulating spring 9 and is screwed on the pressure regulating bolt 7 through a threaded connection; protects the pressure regulating bolt 7 and further Prevent media leakage.

The pressure of the oil inlet pipe of the utility model acts on the conical surface of the main valve core 2, and at the same time, its pressure enters the balance chamber 14 through the pulse tube 19 and the nozzle 20, and acts on the end face of the piston 4. The pressure on the upper side of the pilot valve core 6 is the pressure regulating spring 9 given pressure.

When the oil inlet pipe pressure is constant and without fluctuations, the oil pressure on the lower side of the pilot spool 6 is less than the pressure given by the pressure regulating spring 9 on the upper side of the pilot spool 6; the oil in the balance chamber 14 is in a stagnant state, and the main spool 2. Work in the appropriate position of the design, the pressure of the oil outlet is constant, and the flow is relatively stable.

When the pressure of the oil inlet increases, the oil jet flows into the balance chamber 14 through the pulse tube 19 and the nozzle 20, and the pressure in the balance chamber 14 increases instantaneously. Constant pressure; the pilot spool 6 opens, and the oil flows out from the pressure relief chamber 10 through the pressure relief pipe 15. At the same time, the pressure in the balance chamber 14 decreases, the main valve core 2 moves upward, the opening of the valve port increases, and the flow rate increases. The diameter of the pipe is large enough to keep the pressure at the outlet end of the valve basically constant and to make the system pressure fluctuations small.

The balance pressure in the balance chamber is adjusted by the pressure regulating bolt 7 to the pressure regulating spring 9 to correspond to the required set pressure. The structure and its operation balance the pressure acting on the top face of the piston with the pressure acting on the main spool, any changes in this balance are automatically compensated.

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present utility model without limitation. Although the utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the utility model can be Modifications or equivalent replacements of the technical solutions without departing from the purpose and scope of the technical solutions of the utility model shall be covered by the claims of the utility model.

Claims (6)

1. one kind is not had the servocontrol of leakage pressure regulator valve, comprise main valve and pilot valve, described main valve comprises main valve body, main valve seat and main valve plug, between described main valve and the pilot valve counter balance pocket is set, pilot valve is provided with pressure-releasing chamber, described counter balance pocket is communicated in import of main valve medium and the import of pilot valve medium respectively, and pressure-releasing chamber is communicated in the main valve media outlet, it is characterized in that: described main valve plug big taper and is met to the media flow direction relative with the main valve seat medium channel for little down; Described counter balance pocket and pressure-releasing chamber are respectively by static seal structure and extraneous sealing.

2. nothing according to claim 1 is leaked the servocontrol pressure regulator valve, it is characterized in that: described main valve plug top is provided with the piston that cooperates with the valve body mode of can slide up and down, described piston drives with main valve plug and cooperates, the piston upper-end surface is positioned at counter balance pocket and is provided with the main valve plug spring, and described main valve plug spring is provided with presses pretightening force to withstand on the piston upper-end surface.

3. nothing according to claim 2 is leaked the servocontrol pressure regulator valve, and it is characterized in that: the import of main valve medium is communicated in counter balance pocket by nozzle.

4. nothing according to claim 3 is leaked the servocontrol pressure regulator valve, and it is characterized in that: described pilot valve comprises guide's valve body, guide's spool, guide's valve seat and pressure regulation assembly; Described pilot valve seat is positioned between import of pilot valve medium and the pressure-releasing chamber, described pressure regulation assembly comprises pressure adjusting spring and regulator bolts, described regulator bolts vertically screws in guide's valve body, described pressure adjusting spring one end withstands regulator bolts, and the other end withstands guide's spool from top to bottom by compressive pre-stress withstands on guide's valve seat it.

5. nothing according to claim 4 is leaked the servocontrol pressure regulator valve, it is characterized in that: connect by the stiffness spring driving that vertically is provided with between described piston lower surface and the main valve plug upper-end surface.

6. nothing according to claim 5 is leaked the servocontrol pressure regulator valve, and it is characterized in that: described pressure regulation assembly also comprises outer cover, and described outer cover covers on outside regulator bolts and the pressure adjusting spring and by being threaded and is spun on the regulator bolts.

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