Novel high-precision self-operated regulating valve

Abstract

The utility model provides a novel high-precision self-operated regulating valve which is characterized in that an air inlet channel of a director is in a slender taper hole shape, the aperture is thick outside and thin inside, an air inlet screw is arranged at the tail end of the air inlet channel, a valve front channel is communicated with an air inlet of the director through a pipeline, a valve rear channel is communicated with the lower end of a valve membrane through a pipeline, and an air outlet of the director is communicated with the upper end of the valve membrane. After the regulating valve is designed, the pressure is accurately controlled within a specified pressure range. By reducing the volume of the air inlet, the pressure loss in front of the valve is reduced, the small change of a pressure signal is amplified and fed back to pressure circulation in time, the adjusting sensitivity of the self-operated adjusting valve is improved, and the control precision of pressure adjustment is optimized.

Description

TECHNICAL FIELD

[0001] The utility model relates to self -operated control valve technical field. BACKGROUND

[0002] Self -operated control valve as important control equipment in our country machinery industry, is widely used in each industrial field. Along with the increase of market demand, the automation requirement of self -operated control valve is higher and higher, pursues higher precision, high sensitivity's regulation feedback, and constantly realizes technical improvement and innovation, to enhance the performance and reliability of regulating valve. The valve before pressure of prior art's self -operated control valve enters valve and is directly fed back to the main valve spring and is adjusted, adopts lever mechanism to assist valve and expands pressure signal, realizes micro - pressure control regulation, but the valve before pressure directly acts on the lever mechanism of valve pressure balance system, and the mechanical loss is bigger, and the pressure signal feedback speed is slower. SUMMARY

[0003] In view of the deficiency of prior art, the utility model provides a novel high -precision self -operated control valve, including valve body, valve before passageway, valve after passageway, valve seat, connecting rod head, connecting rod, valve core, valve membrane, control spring, valve rod, commander, the air inlet passage of commander is long and thin conical hole, and the hole diameter is thick inside, and the end of air inlet passage is equipped with air inlet screw, and valve before passageway is connected with the air inlet of commander through pipeline, and valve after passageway is connected with the lower end of valve membrane through pipeline, and the upper end of valve membrane is connected with the air outlet of commander, and the valve after pressure of regulating valve is designed to be accurately controlled in the specified pressure range.

[0004] Preferably, the taper angle of the long and thin conical hole is less than 10 °.

[0005] Preferably, the air inlet passage of air inlet screw is thick inside.

[0006] Preferably, the valve membrane is a rubber corrugated diaphragm.

[0007] Preferably, the pipeline is one of a hard tube or a hose.

[0008] Advantages

[0009] By reducing the volume of the air inlet hole, the valve before pressure loss is reduced, the small change of the pressure signal is amplified, and timely feedback is given to the pressure cycle, the regulating sensitivity of the self -operated control valve is improved, and the control precision of pressure regulation is optimized. BRIEF DESCRIPTION OF DRAWINGS

[0010] Fig. 1 It is whole structure schematic diagram;

[0011] Fig. 2 It is commander structure schematic diagram;

[0012] Fig. 3 It is commander air inlet passage structure schematic diagram.

[0013] In the figure: 1, valve body; 2, valve front passage; 3, valve rear passage; 4, valve seat; 5, valve core; 6, valve film; 7, control spring; 8, valve rod; 10, commander; 10-1, commander air inlet; 10-2, commander air outlet; 10-3, commander upper diaphragm; 10-4, air inlet screw; 10-5, commander lower diaphragm; 10-6, commander spring. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0015] Referring to Figs. 1-3 A novel high-precision self-operated regulating valve, comprising a valve body, a valve front passage, a valve rear passage, a valve seat, a valve core, a valve film, a control spring, a valve rod, a commander, the air inlet passage of the commander is in the shape of an elongated taper hole, the hole diameter is larger at the outside and smaller at the inside, the end of the air inlet passage is provided with an air inlet screw, the valve front passage is connected to the air inlet of the commander through a pipeline, the valve rear passage is connected to the lower end of the valve film through a pipeline, the air outlet of the commander is connected to the upper end of the valve film, and the pressure after the regulating valve is designed to be accurately controlled within a specified pressure range.

[0016] Working principle: the valve front passage 2 is connected to the valve front medium pressure, at the same time, the commander air inlet 10-1 also receives the valve front medium pressure signal, the valve rear passage 3 has a lower pressure at this time, the commander spring 10-6 acts on the commander lower diaphragm 10-5, pushes the valve front pressure through the commander air inlet 10-1 and the air inlet screw 10-4, acts on the upper side of the valve film 6, pushes the valve rod 6 to move downward, drives the valve core 5 to act, controls the valve to open, and makes the valve front passage 2 medium pressure enter the valve rear passage 3, until the valve rear pressure reaches the set pressure. At the same time, the medium pressure of the valve rear passage 3 is fed back to the lower side of the valve film 6, the medium pressure on the upper side of the valve film 6 reaches balance, at the same time, acts on the commander upper diaphragm 10-3, and reaches balance with the air inlet pressure and spring force in the commander cavity. When the valve rear pressure exceeds the set value range, the commander upper diaphragm 10-3 pushes the commander to tend to close, the medium pressure of the commander air outlet 10-3 decreases, the pressure on the lower side of the valve film 6 is greater than the sum of the pressure on the upper side of the valve film 6 and the spring force of the control spring 7, makes the diaphragm drive the valve rod 8 to move upward, drives the valve core to act, controls the valve to tend to close, reduces the flow of the valve front medium to the valve rear, thereby reduces the valve rear pressure, and re-reaches the specified set pressure.

[0017] It is to be understood that the terminology "first" and "second", and the like, used herein is merely intended to differentiate one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between such entities or operations.

Claims

1. A new type of high-precision self-operated regulating valve, comprising a valve body, a pre-valve passage, a post-valve passage, a valve seat, a connecting rod head, a connecting rod, a valve film, a control spring, a valve rod, a commander, characterized in that, The air inlet channel of the commander is in the shape of an elongated taper hole, with the hole diameter being larger at the outside and smaller at the inside, the end of the air inlet channel is provided with an air inlet screw, the pre-valve channel is connected to the air inlet of the commander through a pipeline, the post-valve channel is connected to the lower end of the valve film through a pipeline, the air outlet of the commander is connected to the upper end of the valve film, and the pressure after the regulating valve is designed to be accurately controlled within a specified pressure range.

2. A new type of high-precision self-operated control valve according to claim 1, characterized in that The taper angle of the elongated taper hole is less than 10°.

3. A new type of high-precision self-operated control valve according to claim 1, characterized in that The air inlet channel of the air inlet screw is in the shape of a lower thick and upper thin.

4. A new type of high-precision self-operated control valve according to claim 1, characterized in that The valve film is a rubber corrugated diaphragm.

5. A new type of high-precision self-operated control valve according to claim 1, characterized in that The pipeline is one of a hard pipe and a soft pipe.

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