CN110925255A - Proportional flow valve - Google Patents

Proportional flow valve Download PDF

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Publication number
CN110925255A
CN110925255A CN201911136201.3A CN201911136201A CN110925255A CN 110925255 A CN110925255 A CN 110925255A CN 201911136201 A CN201911136201 A CN 201911136201A CN 110925255 A CN110925255 A CN 110925255A
Authority
CN
China
Prior art keywords
valve
pilot valve
hole
pilot
sleeve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201911136201.3A
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Chinese (zh)
Inventor
刘海燕
徐菲
胡祥松
张昱
唐晓群
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yichang Yi Shuo Plastic Industry Co Ltd
Original Assignee
Yichang Yi Shuo Plastic Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yichang Yi Shuo Plastic Industry Co Ltd filed Critical Yichang Yi Shuo Plastic Industry Co Ltd
Priority to CN201911136201.3A priority Critical patent/CN110925255A/en
Publication of CN110925255A publication Critical patent/CN110925255A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/126—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a diaphragm, bellows, or the like

Abstract

A proportional flow valve comprises a valve body, wherein the valve body is fixed with a valve cover, a corrugated pipe seat is clamped between the valve body and the valve cover, a corrugated pipe is arranged in the corrugated pipe seat, the lower end of the corrugated pipe is connected with a valve core assembly, and the upper end of the corrugated pipe is clamped and fixed by the valve body and the valve cover; the pilot valve comprises a pilot valve body, a sleeve plug, a spring, a pilot valve core, a pilot valve sleeve and a pressing block. The pilot valve body is fixed on the valve cover. One end of the pilot valve core is pressed against the conical surface of the pilot valve sleeve by a spring, and the other end of the pilot valve core is abutted against the push rod of the proportional electromagnet. The proportional electromagnetic valve comprises a proportional electromagnet, and the proportional electromagnet, the pressing block and the pilot valve sleeve are fixed on the pilot valve body. The proportional flow valve provided by the invention can realize the cut-off type shutoff of the valve, and can also enable the valve core opening of the main valve to linearly change along with the input current of the proportional electromagnet, thereby realizing the proportional flow control without additional power and an external driving mechanism.

Description

Proportional flow valve
Technical Field
The invention relates to a valve, in particular to a high-flow automatic control valve for circulating low-pressure media.
Background
Valves are an industrially important fluid control device. The valve controls the change of the flow, pressure, flow direction and temperature of the fluid medium by changing the area of the internal flow channel of the valve.
The valve can be divided into: (1) small drift diameter valve: a valve with nominal diameter DN less than or equal to 40 mm. (2) And a middle drift diameter valve: and the nominal diameter DN is 50-300 mm. (3) Large-bore valve: and the nominal valve DN is 350-1200 mm. (4) The extra-large drift diameter valve: and the nominal diameter DN is more than or equal to 1400 mm.
The driving method can be divided into: automatic valves and power-driven valves. The automatic valve is a valve which does not need external force to drive and controls the action of the valve by means of self energy, such as a one-way valve, a safety valve, a pressure reducing valve, a drain valve, a check valve, an automatic regulating valve and the like. The power driven valve needs to use various power sources to drive the valve so as to realize control. Such as manual, electric, pneumatic, hydraulic, combination drive (electro-hydraulic, electro-pneumatic, gas-liquid, etc.) valves, and the like.
The stop valve is also called stop valve, belonging to forced sealing type valve, when the valve is closed, it must apply force to valve clack to force sealing surface not to leak. The opening and closing part of the stop valve is a plug-shaped valve clack, and the valve clack moves linearly (also has a rotary lifting type) along the central line of the valve seat. Shut-off valves of this type are very suitable for shut-off or regulating and throttling purposes. The valve rod stroke of the valve is relatively short, so the valve has a very reliable cutting function, and the change of the valve seat port and the stroke of the valve clack are in a direct proportion relation, so the valve is very suitable for adjusting the flow.
Although China stipulates the flow direction of the stop valve so as to reduce the force for closing the valve. However, when the valve is closed, the valve clack is inevitably acted by the pressure difference of media on two sides, and the pressure difference is increased sharply in a square relation along with the increase of the drift diameter of the valve. Therefore, shut-off valves are equipped with drive components such as manual mechanisms (suitable for valves having a diameter of less than 300 mm), electric motors, pneumatic motors, hydraulic motors, pneumatic diaphragm heads, pneumatic-hydraulic linkages, hydraulic actuators, etc., and with corresponding devices for detecting and controlling the valve opening (or travel of the drive components), such as valve positioners, etc. In addition, an automatic-manual switching mechanism or the like in an emergency needs to be provided. The whole set of control system realizes the automatic control of the valve, and further realizes the continuous control of the fluid medium. The disadvantage is that both a weak electrical system provides the control signal and a strong electrical system (also using pneumatic, hydraulic systems) provides the additional power. In addition, some of these mechanisms are more expensive and bulky than the valve itself.
The proportional valve and the servo valve in the hydropneumatic industry can realize the continuous automatic control of the flow and the pressure of the fluid medium according to the magnitude of the input current. The proportional valve adopts a preposed proportional electromagnet to drive a main valve core and controls the opening size of the main valve core. The servo valve adopts the hydraulic pressure output by a preposed nozzle baffle valve or a jet flow pipe valve to drive a main valve core and control the size of an opening of the valve core. A main valve core of a proportional valve in the hydropneumatic industry is usually a sliding valve, the valve core has leakage, the drift diameter is small, and the proportional valve belongs to a small-drift-diameter valve.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a proportional flow valve, which aims at a high-flow automatic control valve for circulating low-pressure media and can realize reliable stop sealing when the valve is stopped; meanwhile, in the valve opening process, the pressure change at one end of the valve core of the stop valve is controlled through the combination of the proportional electromagnet and the pilot valve, and then the size of the valve core opening and the continuous proportional change of the flow of the main valve of the stop valve are controlled.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a proportional flow valve comprising: a main valve, a pilot valve and a proportional solenoid valve;
the main valve comprises a valve body, the valve body and the valve cover are fixed, a corrugated pipe seat is clamped between the valve body and the valve cover, a corrugated pipe is arranged in the corrugated pipe seat, the lower end of the corrugated pipe is connected with a valve core assembly, and the valve core assembly moves up and down along the central rod and opens or closes an inner cavity passage of the valve body; the upper end of the corrugated pipe is clamped and fixed by the valve body and the valve cover
The pilot valve comprises a pilot valve body, a sleeve plug, a spring, a pilot valve core, a pilot valve sleeve and a pressing block. The pilot valve body is fixed on the valve cover. One end of the pilot valve core is pressed against the conical surface of the pilot valve sleeve by a spring, and the other end of the pilot valve core is abutted against the push rod of the proportional electromagnet.
The proportional electromagnetic valve comprises a proportional electromagnet, the proportional electromagnet, a pressing block and a pilot valve sleeve are fixed on the pilot valve body, the proportional electromagnet outputs thrust in proportion along with input current, and the proportional electromagnet and a spring jointly determine the displacement of the pilot valve core;
the central rod is provided with a first through hole which is communicated with the inner cavity of the corrugated pipe; a liquid inlet channel and a liquid outlet channel are arranged among the valve cover, the pilot valve body and the pilot valve sleeve, wherein the lower end of the liquid inlet channel is communicated with an inner cavity of the corrugated pipe, the upper end of the liquid inlet channel is communicated with a transverse through hole on the pilot valve sleeve, and the transverse through hole is communicated with a left cavity in the pilot valve sleeve; when the pilot valve core is opened, the left cavity is communicated with the liquid outlet channel.
The liquid inlet channel comprises a valve cover right through hole, the lower end of the valve cover right through hole is communicated with the inner cavity of the corrugated pipe, and the upper end of the valve cover right through hole is communicated with the pilot valve body right through hole and the pilot valve sleeve right annular cavity; the liquid outlet channel comprises a valve cover left through hole, the lower end of the valve cover left through hole is communicated with the left cavity of the valve body through a valve body through hole, and the upper end of the valve cover left through hole is communicated with the pilot valve body left through hole and the pilot valve sleeve left through hole in sequence.
The valve core assembly comprises a valve core sleeve, a rubber pad, a lower hard core and an upper hard core are sequentially sleeved on the valve core sleeve, and the top end of the valve core sleeve is locked through a nut.
The invention discloses a proportional flow valve, which has the following technical effects:
1) in this application, the displacement of pilot valve case has been confirmed to the input current of proportion electro-magnet, and then has confirmed bellows inner chamber pressure, and then has confirmed the displacement that makes progress of main valve case, and then has confirmed the flow of main valve. I.e. the input current of the proportional electromagnet determines the flow of medium from the inlet B to the outlet a via the main valve port. The whole control system only needs to provide 4-20mA control current, and the control power for closing and opening the valve is provided by the medium pressure passing through the valve. By using the technology of the invention, the driving part and the additional power of the existing large-diameter stop valve are not needed. The additional power is typically electric power. Namely, the valve can realize reliable control including the closing and proportional opening of the valve by weak current control signals of 4-20mA and medium pressure in the valve when a power electric system cannot work or is damaged.
2) The main valve adopts a stop valve form, and the main valve core is reliably closed when being stopped.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic diagram of the present invention.
FIG. 2 is a schematic diagram of the present invention.
In the figure: the valve body 1, the damping plug 2, the valve core sleeve 3, the corrugated pipe seat 4, the rubber gasket 5, the first O-ring 6, the second O-ring 7, the third O-ring 8, the fourth O-ring 9, the fifth O-ring 10, the sixth O-ring 11, the proportional electromagnet 12, the first bolt 13, the first gasket 14, the press block 15, the seventh O-ring 16, the pilot valve core 17, the pilot valve sleeve 18, the eighth O-ring 19, the screw 20, the second gasket 21, the pilot valve body 22, the spring 23, the ninth O-ring 24, the sleeve plug 25, the tenth O-ring 26, the eleventh O-ring 27, the combined gasket 28, the valve cover 29, the second bolt 30, the third gasket 31, the central rod 32, the corrugated pipe 33, the nut 34, the upper hard core 35, the lower hard core 36, the first through hole 37, the left through hole 38 of the valve cover, the right through hole 39, the left through hole 40 of the pilot valve body, the right through hole 41 of the pilot valve body, the left through hole 42 of, a valve body through hole 44, a lateral through hole 45, and a left chamber 46.
Detailed Description
As shown in figure 1, the proportional flow valve can realize the cut-off type shutoff of the valve, and can also make the valve core opening of the main valve linearly change along with the input current of the proportional electromagnet, thereby realizing the proportional flow control, and the proportional flow valve does not need additional power and an external driving mechanism and does not need additional power and an external driving mechanism
The device includes: main valve, pilot valve and proportional solenoid valve.
The main valve comprises a valve body 1, a valve cover 29, a corrugated pipe seat 4, a corrugated pipe 33, a rubber pad 5, a lower hard core 36, an upper hard core 35, a nut 34, a central rod 32, a damping plug 2 and related sealing elements and connecting pieces.
The pilot valve comprises a pilot valve body 22, a pilot valve sleeve 18, a sleeve plug 25, a spring 23, a pilot valve core 17, a pressure block 15 and related seals and connectors. The drain port C on the right side of the pilot valve is connected to an outlet A (not shown in the figure).
The proportional electromagnetic valve is as follows: the Huayang DTBZ-75BL ratio type explosion-proof electromagnet has the rated current of 0.8A, the maximum stroke of 3.2mm and the rated suction of 75N.
The proportional electromagnet 12 and the pressure piece 15 are connected to the pilot valve body 22 by a bolt 13 and a washer 14 and fixed.
The pilot valve body 22 is connected to the bonnet 29 by a screw 20 and a washer 21 and fixed.
The bonnet 29 is attached to the valve body 1 and fixed by bolts 30 and washers 31.
The bellows seat 4 is clamped by the bonnet 29 and the valve body 1 so as not to move up and down.
The rubber pad 5 is clamped by the valve core sleeve 3 and the lower hard core 36.
The lower plane of the corrugated pipe 33 is clamped by a lower hard core 36 and an upper hard core 35 and is fastened by the screw thread between the nut 34 and the valve core sleeve 3. From bottom to top, the main valve core assembly is formed by sequentially passing an inner hole of a rubber gasket 5, a lower hard core 36, a lower plane of a corrugated pipe 33, an upper hard core 35 and a nut 34 on the outer cylindrical surface of the valve core sleeve 3.
The main valve spool assembly can slide up and down along the outer cylindrical surface of the upper cross-sectional portion of the central rod 32 and the inner cylindrical surface of the bellows socket 4.
The upper plane of the bellows 33 is clamped between the lower surface of the bonnet 29 and the upper surface of the valve body 1 and is pressed and positioned by the outermost annular groove on the upper surface of the valve body 1.
The bellows 33 is capable of expanding and contracting at the center thereof.
The pilot valve core 17 is a slide valve core, the pilot valve core 17 is installed from the right side of the pilot valve sleeve 18, and after the spring 23 is installed, the sleeve plug 25 is used for plugging the through hole on the right side of the pilot valve sleeve 18. Under the action of the spring 23, the pilot valve core 17 is in a left limit position, the conical surface of the pilot valve core 17 is matched with the conical surface of the pilot valve sleeve 18 to form conical surface sealing, and a channel of the pilot valve core is closed, so that the pilot valve has no leakage.
The left side of the pilot valve core 17 is contacted with the mandril of the proportional electromagnet 12. The ejector rod of the proportional electromagnet 12 overcomes the elastic force of the spring 23 to push the pilot valve core 17 to move rightwards.
As shown in fig. 2, the center rod 32 is provided with a first through hole 37, and the first through hole 37 communicates with the lower damper plug 2. The upper end of the first through hole 37 is communicated with the inner cavity of the corrugated pipe 33; a liquid inlet channel and a liquid outlet channel are arranged among the valve cover 29, the pilot valve body 22 and the pilot valve sleeve 18, wherein the lower end of the liquid inlet channel is communicated with the inner cavity of the corrugated pipe 33, the upper end of the liquid inlet channel is communicated with a transverse through hole 45 on the pilot valve sleeve 18, and the transverse through hole 45 is communicated with a left cavity 46 in the pilot valve sleeve 18; when the pilot valve core 17 is opened, the left chamber 46 is communicated with the liquid outlet channel.
The liquid inlet channel comprises a valve cover right through hole 39, the lower end of the valve cover right through hole 39 is communicated with the inner cavity of the corrugated pipe 33, and the upper end of the valve cover right through hole 39 is communicated with a pilot valve body right through hole 41 and a pilot valve sleeve right annular cavity 43; the other end of the annular chamber is in communication with a transverse through hole 45.
The liquid outlet channel comprises a valve cover left through hole 38, the lower end of the valve cover left through hole 38 is communicated with the left cavity of the valve body 1 through a valve body through hole 44, and the upper end of the valve cover left through hole 38 is sequentially communicated with a pilot valve body left through hole 40 and a pilot valve sleeve left through hole 42.
As shown in FIG. 1, the through hole of the bellows holder 4 communicates the outside of the bellows 33 with the outlet A. Bellows 33 is only acted upon by the lumen pressure.
The force balance equation of the main valve core is as follows:
pb port×A1-GGravity force＝pWave (wave)×A2+KWave (wave)(L+ΔL) (1)
Wherein:
pb port: pressure at port B, upward;
A1: pressure acting area of port B;
Ggravity force: the gravity of the movable part is negligible downwards;
pwave (wave): bellows inner chamber pressure, downward;
A2: upper hard core area (bellows cavity pressure action area); a. the2Greater than A1
KWave (wave): the elastic coefficient of the corrugated pipe;
l: pre-compression displacement of the corrugated pipe;
Δ L: the main spool displaces upward.
Ignoring gravity, the force balance equation for the main spool becomes:
pb port×A1＝pWave (wave)×A2+KWave (wave)(L+ΔL) (2)
The working principle and the process are as follows:
1) when the medium pressure is zero (no medium passes through), the elastic force of the bellows 33 and the gravity of the rubber gasket 5, the lower hard core 36, the upper hard core 35, the valve core sleeve 3 and the nut 34 can enable the rubber gasket 5 to close the main valve port to realize the cut-off of the main valve.
2) When the pilot valve is turned off (position shown in the figure), then pWave (wave)＝pB port，A2Greater than A1The main valve core moves downwards, and the main valve port is closed.
That is, the pressure in the cavity of the bellows 33 is equal to the pressure in the inlet B, and the downward acting area of the pressure in the cavity of the bellows 33 is the area of the upper hard core 35 and is larger than the upward acting area of the inlet B. Therefore, the downward acting force generated by the pressure in the inner cavity of the corrugated pipe 33 is larger than the upward acting force of the port B, and in addition, the elastic force of the corrugated pipe 33 and the gravity of the rubber pad 5, the lower hard core 36, the upper hard core 35, the valve core sleeve 3 and the nut 34 also act downwards, so that the valve core of the main valve is stopped.
At this time, the medium can enter the left chamber 46 on the left side of the conical surface of the pilot valve core 17 from the inlet B, the damping plug 2, the first through hole 37 on the central rod 32, the inner cavity of the bellows 33, the valve cover right through hole 39, the pilot valve body right through hole 41, the pilot valve sleeve right annular cavity 43 and the transverse through hole 45 on the pilot valve sleeve 18, and is closed by the matching conical surfaces of the pilot valve core 17 and the pilot valve sleeve 18 at the positions shown in fig. 1, so that the medium cannot flow.
3) The proportional electromagnet 12 outputs a thrust in proportion with the input current (4-20mA), and forms a force balance with the spring 23 to jointly determine the rightward displacement of the pilot valve core 17. I.e. the displacement of the pilot spool 17 is determined by the proportional electromagnet 12 input current.
After the pilot valve core is opened, the medium can enter the left chamber 46 on the left side of the conical surface of the pilot valve core 17 from the inlet B, the damping plug 2, the first through hole 37 on the central rod 32, the inner cavity of the bellows 33, the right through hole 39 of the valve cover, the right through hole 41 of the pilot valve body, the right annular cavity 43 of the pilot valve sleeve, and the transverse through hole 45 on the pilot valve sleeve 18.
Then flows into the outlet A through the valve port opened by the pilot valve core 17, the pilot valve sleeve left through hole 42, the pilot valve body left through hole 40, the valve cover left through hole 38 and the valve body through hole 44.
In the above flow passage, the through hole at the center of the damping plug 2 is a fixed orifice, the opening of the pilot valve core 17 is an adjustable orifice, and the pressure between the two orifices is reduced along with the opening of the pilot valve core 17 (displacement of the pilot valve core 17). I.e. the internal chamber pressure of the bellows 33 is determined by the displacement of the pilot valve 17.
When the pressure of the port B is not changed, the left side of the equation is a fixed value, and the equation is changed into C-pWave (wave)×A2+KWave (wave)(L+ΔL) (3)
At this time, there are only two variables, pWave (wave)And Δ L, so when pWave (wave)When decreasing, Δ L will increase, i.e. the main valve port is open. And Δ L is with pWave (wave)Changes in a linear rule.
That is, bellows 33 is forced downward by its internal chamber pressure against upper hard core 35 and lower hard core 36, interacting with the pressure at inlet B. When the acting force formed by the pressure in the inner cavity of the bellows 33 is larger than the acting force formed by the pressure in the inlet B, the rubber pad 5 presses the main valve port, and the main valve port is closed. When the pressure in the inner cavity of the bellows 33 forms an acting force smaller than that of the inlet B, the main valve port opens upward, the spool sleeve 3 slides upward along the central rod 32, and the opening (upward) displacement of the main valve port is in a linear relationship with the pressure in the inner cavity of the bellows 33. I.e. the upward displacement of the main valve port is determined by the pressure in the chamber of the bellows 33.
The pressure of a medium suitable for the device can be as low as 0.25MPa, and the device is suitable for a valve with a flow path DN20-1200 mm. When the pressure exceeds 0.25MPa and the drift diameter exceeds 1200mm, an additional spring can be arranged in the corrugated pipe to enhance the elastic rigidity of the corrugated pipe.

Claims (4)

1. A proportional flow valve comprising: a main valve, a pilot valve and a proportional solenoid valve;
the main valve comprises a valve body (1), the valve body (1) and a valve cover (29) are fixed, a corrugated pipe seat (4) is clamped between the valve body (1) and the valve cover (29), a corrugated pipe (33) is arranged in the corrugated pipe seat (4), the lower end of the corrugated pipe (33) is connected with a valve core assembly, and the valve core assembly moves up and down along a central rod (32) and opens or closes an inner cavity passage of the valve body (1); the upper end of the corrugated pipe (33) is clamped and fixed by the valve body (1) and the valve cover (29);
the pilot valve comprises a pilot valve body (22), a spring (23), a pilot valve core (17), a pilot valve sleeve (18) and a pressing block (15);
the pilot valve body (22) is fixed on the valve cover (29); one end of the pilot valve core (17) is pressed against the conical surface of the pilot valve sleeve by a spring (23), and the other end of the pilot valve core is abutted against the push rod of the proportional electromagnet (12);
the proportional electromagnetic valve comprises a proportional electromagnet (12), the proportional electromagnet (12), a pressure block (15) and a pilot valve sleeve (18) are fixed on a pilot valve body (22), the proportional electromagnet (12) outputs thrust in proportion along with input current, and the proportional electromagnet and a spring (23) jointly determine the displacement of a pilot valve core (17);
the central rod (32) is provided with a first through hole (37), and the first through hole (37) is communicated with the inner cavity of the corrugated pipe (33); a liquid inlet channel and a liquid outlet channel are arranged among the valve cover (29), the pilot valve body (22) and the pilot valve sleeve (18), wherein the lower end of the liquid inlet channel is communicated with the inner cavity of the corrugated pipe (33), the upper end of the liquid inlet channel is communicated with a transverse through hole (45) on the pilot valve sleeve (18), and the transverse through hole (45) is communicated with a left cavity (46) in the pilot valve sleeve (18); when the pilot valve core (17) is opened, the left chamber (46) is communicated with the liquid outlet channel.
2. The proportional flow valve of claim 1, further comprising: the liquid inlet channel comprises a valve cover right through hole (39), the lower end of the valve cover right through hole (39) is communicated with an inner cavity of the corrugated pipe (33), and the upper end of the valve cover right through hole is communicated with a pilot valve body right through hole (41) and a pilot valve sleeve right annular cavity (43); the liquid outlet channel comprises a valve cover left through hole (38), the lower end of the valve cover left through hole (38) is communicated with a left cavity of the valve body (1) through a valve body through hole (44), and the upper end of the valve cover left through hole (38) is sequentially communicated with a pilot valve body left through hole (40) and a pilot valve sleeve left through hole (42).
3. The proportional flow valve of claim 1, further comprising: the valve core assembly comprises a valve core sleeve (3), a rubber gasket (5), a lower hard core (36) and an upper hard core (35) are sequentially sleeved on the valve core sleeve (3), and the top end of the valve core sleeve (3) is locked through a nut (34).
4. The proportional flow valve of claim 1, further comprising: the pilot valve core (17) is a slide valve core, and the pilot valve core (17) and the conical surface of the pilot valve sleeve (18) form conical surface sealing when the left limit is performed.
CN201911136201.3A 2019-11-19 2019-11-19 Proportional flow valve Pending CN110925255A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911136201.3A CN110925255A (en) 2019-11-19 2019-11-19 Proportional flow valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911136201.3A CN110925255A (en) 2019-11-19 2019-11-19 Proportional flow valve

Publications (1)

Publication Number Publication Date
CN110925255A true CN110925255A (en) 2020-03-27

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ID=69850320

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911136201.3A Pending CN110925255A (en) 2019-11-19 2019-11-19 Proportional flow valve

Country Status (1)

Country Link
CN (1) CN110925255A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114185368A (en) * 2021-12-01 2022-03-15 贵州航天朝阳科技有限责任公司 High-precision flow proportional control valve
CN114185368B (en) * 2021-12-01 2024-05-03 贵州航天朝阳科技有限责任公司 High-precision flow proportional control valve

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114185368A (en) * 2021-12-01 2022-03-15 贵州航天朝阳科技有限责任公司 High-precision flow proportional control valve
CN114185368B (en) * 2021-12-01 2024-05-03 贵州航天朝阳科技有限责任公司 High-precision flow proportional control valve

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