CN112833230A - a pneumatic control valve - Google Patents
a pneumatic control valve Download PDFInfo
- Publication number
- CN112833230A CN112833230A CN202110212241.2A CN202110212241A CN112833230A CN 112833230 A CN112833230 A CN 112833230A CN 202110212241 A CN202110212241 A CN 202110212241A CN 112833230 A CN112833230 A CN 112833230A
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- Prior art keywords
- valve body
- valve
- hollow
- pneumatic control
- core
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Classifications
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- 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
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/0466—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with a special seating surface
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- 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
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
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- 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
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/46—Attachment of sealing rings
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- 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
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/164—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side and remaining closed after return of the normal pressure
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- 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
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/02—Means in valves for absorbing fluid energy for preventing water-hammer or noise
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Multiple-Way Valves (AREA)
Abstract
本发明公开了一种气动控制阀，包括主阀体以及气动执行机构，所述主阀体包括同轴设置且相连通的前阀体、中阀体以及后阀体，所述中阀体设置在前阀体内且靠近后阀体，后阀体靠近中阀体一侧设置有阀瓣座，所述阀瓣座上设置有阀瓣件；所述气动执行机构包括中空阀芯以及弹性件，所述中空阀芯同轴地设置在主阀体内，所述中空阀芯的外壁与前阀体以及中阀体的内壁滑动连接，所述弹性件套设在中空阀芯上且与前阀体相接触，所述中空阀芯在弹性件的作用下压紧在阀瓣件上，前阀体上设置有气源接口，气源接口用以通入高压气体，所述高压气体带动中空阀芯运动并脱离阀瓣件。本发明将主阀体与气动执行机构一体化，结构紧凑，实现在较小空间的使用。
The invention discloses a pneumatic control valve, comprising a main valve body and a pneumatic actuator. The main valve body comprises a front valve body, a middle valve body and a rear valve body which are coaxially arranged and communicated, and the middle valve body is provided with In the front valve body and close to the rear valve body, a valve disc seat is arranged on the side of the rear valve body close to the middle valve body, and a valve disc member is arranged on the valve disc seat; the pneumatic actuator includes a hollow valve core and an elastic member, The hollow valve core is coaxially arranged in the main valve body, the outer wall of the hollow valve core is slidably connected with the front valve body and the inner wall of the middle valve body, and the elastic piece is sleeved on the hollow valve core and is connected with the front valve body In contact with each other, the hollow valve core is pressed against the valve disc member under the action of the elastic member, and the front valve body is provided with an air source interface, which is used to pass high-pressure gas, and the high-pressure gas drives the hollow valve core. Move and disengage the disc member. The present invention integrates the main valve body and the pneumatic actuator, has a compact structure, and can be used in a small space.
Description
Technical Field
The invention relates to the technical field of valves, in particular to a pneumatic control valve.
Background
The pneumatic valve is driven by compressed air to realize opening and closing, and is suitable for controlling media such as gas, steam, liquid and the like. A pneumatic valve of the present structure, in which an actuator is separated from a valve and the intermediate is connected by a transmission mechanism, is disclosed in, for example, CN109538787A, and comprises: the valve body, the upper valve cover, the valve core and the valve shaft; the valve core is provided with a channel; the device comprises a rotary cylinder, a cylinder driving executing mechanism, a sealing control mechanism and a valve core action position detection mechanism; the outer walls of the two ports of the valve core are respectively provided with a sealing groove along the circumferential direction, and an inflatable sealing ring is arranged in the sealing groove; a valve core air inlet channel communicated with the sealing groove is radially arranged in the valve core; a valve shaft air inlet channel communicated with the valve core air inlet channel is axially arranged in the valve shaft; the valve core air inlet channel is communicated with the inflatable sealing ring. The valve core is driven by the cylinder to act, the valve core controls air pressure to inflate and pressurize the sealing ring after reaching a set position, so that the valve reaches the complete sealing requirement, and the pressure of air entering the sealing ring can be adjusted by the filtering and reducing valve according to the use requirement. However, according to the above patents and the conventional pneumatic valve structure, the conventional pneumatic valve has problems of many parts, complicated structure and large external dimension, and in some cases, there is not enough space for installing the valve, which is difficult to satisfy the demand.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a pneumatic control valve which can be installed in a small space and has a compact structure.
In order to achieve the purpose, the invention adopts the following technical scheme: a pneumatic control valve comprises a main valve body and a pneumatic actuating mechanism, wherein the main valve body comprises a front valve body, a middle valve body and a rear valve body which are coaxially arranged and communicated, the middle valve body is arranged in the front valve body and close to the rear valve body, a valve flap seat is arranged on one side of the rear valve body close to the middle valve body, and a valve flap piece is arranged on the valve flap seat; the pneumatic actuating mechanism comprises a hollow valve core and an elastic piece, the hollow valve core is coaxially arranged in a main valve body, the outer wall of the hollow valve core is connected with a front valve body and the inner wall of the middle valve body in a sliding mode, the elastic piece is sleeved on the hollow valve core and is in contact with the front valve body, the hollow valve core is pressed on a valve clack piece under the action of the elastic piece, an air source interface is arranged on the front valve body and is used for introducing high-pressure air, and the high-pressure air drives the hollow valve core to move and separate from the valve clack piece. The main valve body and the pneumatic actuator are combined into a whole, and the opening and closing actions of the control valve are completed in the main valve body, so that the overall dimension is reduced, and a small-size pneumatic valve structure is realized.
In one embodiment, one end of the hollow valve core is inserted into the front valve body, an accommodating cavity is formed between one end of the hollow valve core and the front valve body, and the elastic element is arranged in the accommodating cavity; the other end of the hollow valve core is inserted into the middle valve body, an air cavity is formed between the other end of the hollow valve core and the middle valve body, and the air source interface is communicated with the air cavity. High-pressure gas is introduced from the air cavity to extrude the elastic piece, so that the valve is opened and closed.
In one embodiment, at least one seal is disposed between one end of the hollow spool and the front valve body. The sealing performance is improved by the sealing element.
In one embodiment, at least one sealing element is arranged between the other end of the hollow valve core and the middle valve body. The sealing performance is improved by the sealing element.
In one embodiment, the hollow valve core comprises a hollow valve part and a piston part, the piston part is arranged on the outer side surface of the hollow valve part in a surrounding mode, the piston part is arranged in the middle of the hollow valve part, the accommodating cavity is located between the piston part and the front valve body, and the air cavity is located between the piston part and the middle valve body. The arrangement of the elastic member and the air chamber is thereby facilitated.
In one embodiment, the hollow valve portion is provided with a tapered edge at the end that engages the valve flap member, whereby the tapered edge is urged against the valve flap member by the resilient member to form a seal against leakage.
In one embodiment, the valve flap seat is arranged inside the rear valve body, the valve flap seat comprises a flap ring body and a connecting plate body, the flap ring body and the rear valve body are coaxially arranged, a gap exists between the outer wall of the flap ring body and the inner wall of the rear valve body, the connecting plate body is arranged around the valve ring body in a surrounding mode, the connecting plate body is connected with the inner wall of the rear valve body, and the valve flap body is arranged in the valve ring body and seals the valve ring body. The valve ring body is combined with the valve clack piece to realize sealing by matching with the tapered knife edge, and a gap between the valve ring body and the rear valve body is used as a flow channel of fluid medium.
In one embodiment, a sealing member is disposed between the piston portion and the front valve body, between the middle valve body and the front valve body, and between the rear valve body and the front valve body.
In one embodiment, the elastic element is a compression spring, and a silencer is inserted into the front valve body and is matched with the accommodating cavity. The silencer is used for reducing the noise and realizing the effect of a mute valve.
The invention integrates the main valve body and the pneumatic actuating mechanism into a whole, has compact integral structure, small volume and regular appearance, and is suitable for being installed in various environments with small space for use.
Drawings
Fig. 1 is a schematic diagram illustrating an overall structure of a pneumatic control valve according to the present invention;
FIG. 2 is a schematic cross-sectional view of a pneumatic control valve according to the present invention in a first state;
FIG. 3 is a schematic cross-sectional view of a pneumatic control valve according to the present invention in a second state;
fig. 4 is a schematic diagram illustrating an exploded structure of a pneumatic control valve according to the present invention;
fig. 5 is a schematic view of the overall structure of the rear valve body of the pneumatic control valve according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
The terms used herein are intended to explain the embodiments and are not intended to limit and/or define the invention, it being understood that the terms "front," "back," "left," "right," and the like are used in the specification and are based on the orientations and positional relationships shown in the drawings, or are the orientations and positional relationships conventionally used in the placement of articles of the invention or are the orientations and positional relationships conventionally understood by those skilled in the art, and are used merely to facilitate the description and simplify the description and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and thus should not be construed as limiting the invention.
Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to fig. 1 to 5.
Fig. 1 is a schematic perspective view of a pneumatic control valve according to an embodiment of the present invention.
Fig. 2 is a schematic cross-sectional view of a pneumatic control valve according to an embodiment of the present invention in a first state (closed state);
fig. 3 is a schematic cross-sectional view of a pneumatic control valve according to an embodiment of the present invention in a second state (open state);
FIG. 4 is a schematic structural view of an explosive state of a pneumatic control valve according to an embodiment of the present invention;
fig. 5 is a schematic diagram of the overall structure of the rear valve body of the pneumatic control valve according to the embodiment of the present invention, which specifically includes the rear valve body, the valve flap seat, and the valve flap member.
Referring to fig. 1 to 5, the pneumatic control valve provided by the present invention mainly includes a main valve body and a pneumatic actuator which are combined into a whole, specifically, the main valve body includes a front valve body 100, a middle valve body 200 and a rear valve body 300 which are coaxially arranged and communicated, the middle valve body 200 is arranged in the front valve body 100 and is close to the rear valve body 300, channels for fluid media to pass through are arranged in the front valve body 100, the middle valve body 200 and the rear valve body 300, the three are nested and fixed to form a housing structure of the valve body, a liquid inlet 101 at the front of the front valve body 100 is used as a liquid inlet channel, and a liquid outlet 301 at the rear of the rear valve body 300 is used.
Referring to fig. 2-5, be provided with valve clack seat 400 in valve body 200 one side in the valve body 300 is close to, be provided with valve clack 500 on the valve clack seat 400, valve clack seat 400 sets up inside valve body 300 in the back, valve clack seat 400 includes lamella ring body 410 and connecting plate body 420, and the valve ring body 410 is the pipe form, and the connecting plate body is straight plate form, lamella ring body 410 just with the coaxial setting of back valve body 300 there is the clearance, four between the outer wall of lamella ring body 410 and the inner wall of back valve body 300 connecting plate body 420 is even encircles the setting around the valve ring body 410, and valve clack seat 400 adopts the mode of whole cast (integrated into one piece) or components of a whole that can function independently embedding with back valve body.
Referring to fig. 5, the valve flap member 500 is embedded in the valve ring body 410 and closes the valve ring body 410, and the valve flap member 500 adopts a circular valve flap structure, the diameter of which is consistent with the inner diameter of the valve ring body, and just closes the passage of the valve ring body.
Referring to fig. 2 to 4, the pneumatic actuator includes a hollow valve element 600 and an elastic member 700, the elastic member 700 is a compression spring, and provides an acting force for the hollow valve element 600, the hollow valve element 600 is coaxially disposed in the main valve body, the outer wall of the hollow valve element 600 is slidably connected to the inner walls of the front valve body 100 and the middle valve body 200, the elastic member 700 is sleeved on the hollow valve element 600 and contacts with the front valve body 100, and the hollow valve element 600 is pressed against the valve clack member 500 under the action of the elastic member 700, so that the passage of the hollow valve element 600 is sealed by the valve clack member, and the closing effect of the valve is achieved.
And, there is an air source interface 1000 on the front valve body 100, the air source interface 1000 is used to introduce high-pressure air, the input high-pressure air drives the axial movement of the hollow valve core 600 (overcomes the pressure brought by the elastic component 700) and breaks away from the valve clack component 500, the channel of the hollow valve core is opened, and the fluid medium realizes the circulation through the gap channel between the outer wall of the valve clack component 410 and the inner wall of the rear valve body 300.
Referring to fig. 2 to 4, the hollow valve cartridge 600 includes a hollow valve portion 610 and a piston portion 620, the piston portion 620 being disposed around an outer side surface of the hollow valve portion 610, the piston portion 620 being disposed at a middle portion of the hollow valve portion 610, whereby an outer diameter of a front end and a rear end of the hollow valve portion 610 are identical, a difference in front and rear outer diameters is less than 1mm, the receiving chamber 110 is located between the piston portion 620 and the front valve body 100, and the air chamber 120 is located between the piston portion 620 and the middle valve body 200.
Wherein, one end (front end) of hollow valve core 600 inserts in the preceding valve body 100 (and is linked together with the inlet 101 of preceding valve body 100), constitute one between one end of hollow valve core 600 and the preceding valve body 100 and hold chamber 110, elastic component 700 sets up in holding chamber 110, inserts on the preceding valve body 100 and is provided with muffler 800 (muffler 800 adopt in the field commonly used copper muffler accessory can), muffler 800 cooperatees with holding chamber 110, through muffler 800, plays the effect of amortization for reduce exhaust pulsation, and reduce exhaust noise as far as possible, can avoid external impurity to get into inside the valve body simultaneously. Due to the existence of the piston part 620, the hollow valve core cannot penetrate out of the liquid inlet.
And, the other end (rear end) of the hollow valve core 600 is inserted into the middle valve body 200, an air chamber 120 is formed between the other end of the hollow valve core 600 and the middle valve body 200, the air source interface 1000 is communicated with the air chamber 120, and due to the existence of the piston part, the hollow valve core cannot be separated from the middle valve body, thereby ensuring normal use.
Moreover, a tapered knife edge 611 is arranged at the end of the hollow valve part 610, which is matched with the valve flap 500, that is, the end surface of the hollow valve part 610 is chamfered, so as to form a tapered knife edge-shaped structure, thereby ensuring the sealing performance and facilitating the flow guiding.
As shown in fig. 2, at this time, the pneumatic control valve is in a closed state, the rear end (the tapered knife edge) of the hollow valve core is attached to the surface of the valve clack member 500 under the action of the compression spring, and the medium flow passage is closed; as shown in fig. 3, when the pneumatic control valve is in an open state (after high-pressure air is introduced), the high-pressure air pushes the hollow valve core to overcome the spring force of the compression spring and axially move towards one end of the liquid inlet, at this time, the rear end (tapered knife edge) of the hollow valve core is separated from the valve clack member 500, and the medium circulation channel is opened.
Certainly, in order to ensure the sealing performance, one sealing element 10 is arranged between one end (front end) of the hollow valve core 600 and the front valve body 100, two sealing elements 10 are arranged between the other end (tail end) of the hollow valve core 600 and the middle valve body 200, one sealing element 10 is arranged between the piston part 620 and the front valve body 100, between the middle valve body 200 and the front valve body 100, and between the rear valve body 300 and the front valve body 100, and the sealing elements can be conventional sealing ring structures in the field.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A pneumatic control valve comprises a main valve body and a pneumatic actuating mechanism, and is characterized in that the main valve body comprises a front valve body, a middle valve body and a rear valve body which are coaxially arranged and communicated, the middle valve body is arranged in the front valve body and close to the rear valve body, a valve flap seat is arranged on one side of the rear valve body close to the middle valve body, and a valve flap piece is arranged on the valve flap seat;
the pneumatic actuating mechanism comprises a hollow valve core and an elastic piece, the hollow valve core is coaxially arranged in the main valve body, the outer wall of the hollow valve core is connected with the front valve body and the inner wall of the middle valve body in a sliding mode, the elastic piece is sleeved on the hollow valve core and is in contact with the front valve body, and the hollow valve core is pressed on the valve clack piece under the action of the elastic piece;
the front valve body is provided with an air source interface, the air source interface is used for introducing high-pressure air, and the high-pressure air drives the hollow valve core to move and separate from the valve clack piece.
2. A pneumatic control valve according to claim 1, wherein one end of the hollow spool is inserted into the front valve body, an accommodating chamber is formed between the one end of the hollow spool and the front valve body, and the elastic member is disposed in the accommodating chamber;
the other end of the hollow valve core is inserted into the middle valve body, an air cavity is formed between the other end of the hollow valve core and the middle valve body, and the air source interface is communicated with the air cavity.
3. A pneumatic control valve according to claim 2, wherein at least one seal is provided between one end of the hollow spool and the front valve body.
4. A pneumatic control valve according to claim 2, wherein at least one seal is provided between the other end of the hollow spool and the middle valve body.
5. The pneumatic control valve according to claim 2, wherein the hollow spool includes a hollow valve portion and a piston portion, the piston portion is provided around an outer side surface of the hollow valve portion, the piston portion is provided at a middle portion of the hollow valve portion, the accommodation chamber is located between the piston portion and the front valve body, and the air chamber is located between the piston portion and the middle valve body.
6. A pneumatic control valve according to claim 5, wherein the end of the hollow valve portion which engages with the valve flap member is provided with a tapered edge.
7. The pneumatic control valve according to claim 6, wherein the valve flap seat is disposed inside the rear valve body, the valve flap seat includes a flap ring body and a plurality of connecting plates, the flap ring body is disposed coaxially with the rear valve body, a gap is formed between an outer wall of the flap ring body and an inner wall of the rear valve body, the plurality of connecting plates are disposed around the flap ring body, and the plurality of connecting plates are connected to the inner wall of the rear valve body.
8. A pneumatic control valve according to claim 7, wherein the flap member is disposed within and closes the annulus.
9. A pneumatic control valve according to claim 5, wherein seals are provided between the piston portion and the front valve body, between the middle valve body and the front valve body, and between the rear valve body and the front valve body.
10. A pneumatic control valve according to claim 2, wherein the elastic member is a compression spring, and a muffler is inserted into the front valve body and fitted into the receiving chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110212241.2A CN112833230A (en) | 2021-02-25 | 2021-02-25 | a pneumatic control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110212241.2A CN112833230A (en) | 2021-02-25 | 2021-02-25 | a pneumatic control valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112833230A true CN112833230A (en) | 2021-05-25 |
Family
ID=75933451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110212241.2A Pending CN112833230A (en) | 2021-02-25 | 2021-02-25 | a pneumatic control valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112833230A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1322808A (en) * | 1970-11-30 | 1973-07-11 | Davis Pneumatic Systems Ltd | Pneumatic valve |
| CN202469017U (en) * | 2012-03-22 | 2012-10-03 | 翁焕新 | Air-operated valve |
| CN210344308U (en) * | 2019-09-03 | 2020-04-17 | 依格流体技术（嘉兴）有限公司 | Pneumatic valve with overflow hole |
| CN214699368U (en) * | 2021-02-25 | 2021-11-12 | 嘉兴依济流体科技股份有限公司 | Pneumatic control valve |
-
2021
- 2021-02-25 CN CN202110212241.2A patent/CN112833230A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1322808A (en) * | 1970-11-30 | 1973-07-11 | Davis Pneumatic Systems Ltd | Pneumatic valve |
| CN202469017U (en) * | 2012-03-22 | 2012-10-03 | 翁焕新 | Air-operated valve |
| CN210344308U (en) * | 2019-09-03 | 2020-04-17 | 依格流体技术（嘉兴）有限公司 | Pneumatic valve with overflow hole |
| CN214699368U (en) * | 2021-02-25 | 2021-11-12 | 嘉兴依济流体科技股份有限公司 | Pneumatic control valve |
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