CN1880807A - Current limit control valve - Google Patents
Current limit control valve Download PDFInfo
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- CN1880807A CN1880807A CN 200510046713 CN200510046713A CN1880807A CN 1880807 A CN1880807 A CN 1880807A CN 200510046713 CN200510046713 CN 200510046713 CN 200510046713 A CN200510046713 A CN 200510046713A CN 1880807 A CN1880807 A CN 1880807A
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Abstract
The invention relates to a current-limiting control valve, which comprises: a valve body, a membrane, a spring, a valve base, a valve rod, a tube connecting port, a transmission plate and an adjusting screw slide rod, wherein the membrane is at the middle of valve body to divide the valve body into sealed upper and lower parts; the transmission plate is under the membrane; the valve rod and valve base are under the transmission plate; the control springs are arranged under the transmission plate, the valve rod and the outer side of valve base; the control spring contacts the transmission plate; the limit spring is arranged under the valve rod to support the valve rod to move upwards; the adjusting spring is above the membrane; the adjusting screw sliding rod is above the adjusting spring to control the adjusting spring to move transmission plate downwards. The invention is one safety protector, to control the pressure of decompressor and control the liquid flux, to confirm the normal operation in abnormal condition. And it has simple structure, simple operation and reliable property.
Description
Technical field
The present invention relates to a kind of current limit control valve of controlling fluid flow or control gear pressure.
Background technique
At middle-size and small-size decompressor, adopt vacuum pump equal vacuum equipment that decompressor is vacuumized mostly, the additional tolerance that enters vacuum pump with pneumatic valve control is stable with the pressure protect that reaches in the decompressor simultaneously.Petrochemical industry for example, the vacuum tower of hydrocracking medium-sized tester if want vacuum degree control with vacuum tower in certain limit, needs install a pneumatic valve additional between vacuum tower and vacuum pump, and make-up gas enters vacuum pump by pneumatic valve.This pneumatic valve is controlled the size of pneumatic valve air inflow with compress wind control by compress wind, thereby regulates the size of the vacuum pump amount of vacuumizing, and the vacustat that reaches vacuum tower is between 40～60mmHg.
In general, the pressure of compress wind must be between 0.02～0.1MPa, and pneumatic valve could proper functioning,, or has a power failure the pressure≤0.02MPa of compress wind, or pneumatic valve rupture of diaphragm and cisco unity malfunction suddenly if air compressor breaks down suddenly.Existing pneumatic valve mainly divides two kinds, and a kind of is the air to open valve, when compress wind≤0.02MPa, and the valve position complete shut-down of pneumatic valve, overlong time like this, it is low excessively that the degree of vacuum of vacuum tower is taken out, and can cause the damage of equipment; For preventing damage equipment, can select another kind of pneumatic valve for use---the air to close valve, when compress wind≤0.02MPa, the valve position standard-sized sheet of pneumatic valve can be avoided damage equipment like this, but when the valve position standard-sized sheet of pneumatic valve, a large amount of air enter vacuum tower, high temp oil gas in the vacuum tower runs into air and can burn in (burning tower), and the lighter causes the delay of test, and weight person causes the damage of vacuum tower.
On the petrochemical industry commercial plant, high-pressure separator subtracts oil and the diminishing modulating valve adopts the control of air to close valve, prevent that the high score liquid level is too high in the state of accident, liquid is sealed in the gas circuit, but subtract oil or the diminishing amount is excessive, can influence downstream unit safety such as low pressure separator, also can cause the rapid decline of high-pressure separator pressure.Smart stream tower capacity of reflux modulating valve generally uses the air to close valve, and valve wide open guarantees capacity of reflux in the state of accident, to prevent steaming of substandard product, because capacity of reflux is excessive, can influence the fluctuation of tower temperature and the output of product.Smart stream Tata still reboiler steam flow control valve also is to adopt the air to close valve, prevent in the state of accident in the tower still material crystallization or solidify, but the superheated vapor amount is excessive, makes tower still temperature too high, causes substandard product to steam, and influences quality of product.The boiler feed water modulating valve often adopts the air to close valve, to guarantee that modulating valve is in fully open position under the accident condition, make boiler not reason supply water and interrupt and burn out, it is excessive to supply water, and can cause the waste of the water and the energy.CN2282627Y discloses a kind of gas and liquid flow control valve, need take manual or electronic control, and control valve itself can not directly be realized degree of vacuum or flow control.
Summary of the invention
At above-mentioned prior art deficiency, designed current limit control valve, can make the normal operation of the situation assurance device of not controlling compress wind or pneumatic valve rupture of diaphragm.
Current limit control valve concrete structure of the present invention comprises parts such as valve body, diaphragm, spring, valve seat, valve rod, pipeline connection mouth, driver plate and adjusting screw thread slide bar; Wherein diaphragm arrangement is in the middle of valve body, valve body is divided into airtight two-part up and down, driver plate is arranged on below the diaphragm, valve rod and valve seat are arranged on below the driver plate, below the driver plate, valve rod and valve seat arranged outside control spring, control spring contacts with driver plate, restraining spring is set below the valve rod, restraining spring supports valve rod and moves upward, Regulation spring is arranged on above the diaphragm, regulate the screw thread slide bar and be arranged on above the Regulation spring, regulate screw thread slide bar controllable adjustable spring driver plate is moved down.
Wherein valve body comprises upper valve body and following valve body, upper valve body and the Placement formation valve body of following valve body with flange, and the conical surface is processed at the sealing position, sandwich diaphragm and sealing "O.The pipeline connection mouth comprises connection mouth, outlet connection mouth and inlet connection mouth, and last connection mouth is connected with the compress wind pipeline, and the outlet connection mouth is connected with control logistics pipeline with the inlet connection mouth.Last connection mouth is arranged on the upper valve body, and outlet connection mouth and inlet connection mouth are arranged on down on the valve body.Last connection mouth, outlet connection mouth and inlet connection mouth are female thread structures, and corresponding connecting head can be set.Be processed into coaxial cylindrical ladder space by the center in the following valve body, restraining spring, cylinder-shaped valve rod and ring-shaped valve seats are housed in the space, restraining spring is enclosed within the lower end of valve rod, valve seat is enclosed within the upper end of valve rod, valve rod is processed into the conical surface near the valve seat place, valve rod can slide in valve seat orifice, stem head is stretched outside valve seat, valve seat is fixed on down in the valve space with the Placement of screw thread, the bottom, space has a passage to lead to the outlet connection mouth, on the stem head circular driver plate and diaphragm, by diaphragm and driver plate, the size of control valve stem valve position; There is a circular groove outer in following valve body central cylindrical ladder space, interior dress control spring, and the circular groove bottom has a passage to lead to the inlet connection mouth, is driver plate on the control spring.
The present invention designs according to force balance principle; can be installed in as required before or after the control negative pressure device pneumatic valve; as a kind of security protection device; be applicable to the negative pressure equipment in the petrochemical plant; it has when compress wind and stops air feed suddenly; in the time of can not normally controlling the negative pressure of vacuum tower with the pneumatic valve of compress wind control; current limit control valve can be regulated the air inflow of pneumatic valve inlet automatically; prevent that a large amount of air from entering pressure regulating equipment and causing contingency, guarantee that vacuum tower can proper functioning under improper situation.Also can be used for fields such as petrochemical industry commercial plant fluid flow as required; as a kind of security protection device that is installed in before or after the controlling liquid flow pneumatic valve; it has when accident conditions such as interruption of source of the gas air feed or pneumatic valve rupture of diaphragm; current limit control valve can be regulated the pneumatic valve fluid flow automatically; prevent that fluid flow is excessive; and causing the tooling contingency, the decline of quality of product and the waste of resource can be played the safety protection effect.The present invention also has simple in structure, and size is little, and is in light weight, characteristics such as reliable performance.
Description of drawings
Fig. 1 is a kind of concrete structure schematic representation of current limit control valve of the present invention.
Fig. 2 is that current limit control valve of the present invention is used for testing apparatus vacuum tower gas circuit rough schematic.
Embodiment
Below in conjunction with accompanying drawing 1 explanation detailed construction of the present invention and use.The sequence number meaning of current limit control valve shown in Figure 1 is:
1, tightening nut, 2, regulating handle, 3, regulate the screw thread slide bar, 4, sealing nut, 5, seal ring, 6, regulate thread bush, 7, upper valve body, 8, pad, 9, Regulation spring, 10, pad, 11, diaphragm, 12, the sealing "O, 13, jump ring, 14, driver plate, 15, control spring, 16, the outlet connecting head, 17, following valve body, 18, the inlet connecting head, 19, restraining spring, 20, valve rod, 21, valve seat, 22, upper binding head.
Current limit control valve of the present invention is by valve body (upper valve body 7, following valve body 17), diaphragm 11, spring (Regulation spring 9, control spring 15, restraining spring 19), valve seat 21, valve rod 20, connecting head (upper binding head 22, outlet connecting head 16, inlet connecting head 18, upper binding head is connected with the compress wind pipeline, and the outlet connecting head is connected with control logistics pipeline with the inlet connecting head.), driver plate 14, regulating handle 2 is regulated screw thread slide bar 3, sealing nut 4, seal ring 5 is regulated thread bush 6 parts such as grade and is constituted.Upper valve body 7 and the Placement formation valve body of following valve body 17 with flange, the conical surface is processed at the sealing position, sandwich diaphragm 11 and sealing "O 12, sealing "O 12 strengthens valve seal intensity, diaphragm 11 constitutes air chamber with upper valve body 7, and compress wind can enter air chamber by upper binding head 22; Upper binding head 22 constitutes with the Placement of upper valve body 7 with screw thread, and the compress wind pipeline links to each other with upper binding head 22; Inlet connecting head 18, outlet connecting head 16 and following valve body 17 constitute with the Placement of screw thread, and outlet connecting head 16 links to each other with the pneumatic valve inlet by pipeline; Be processed into coaxial cylindrical ladder space by the center in the following valve body 17, restraining spring 19 is housed in the space, cylinder-shaped valve rod 20 and ring-shaped valve seats 21, restraining spring 19 is enclosed within the lower end of valve rod 20, it is when no active force, restriction valve rod 20 and 21 minimum exhausting air amounts of valve seat, valve seat 21 is enclosed within the upper end of valve rod 20, valve rod 20 is processed into the conical surface by valve seat 21 places, valve rod 20 can slide in valve seat 21 holes, between control valve rod 20 and the valve seat 21 by gas flow how much, 20 of valve rods are stretched outside valve seat 21, valve seat 21 is fixed on down in valve body 17 spaces with the Placement of screw thread, the bottom, space has a passage to lead to outlet connecting head 16, by this passage and outlet connecting head 16, and can be to the pneumatic valve air feed; On 20 of the valve rods is circular driver plate 14 and diaphragm 11, by diaphragm 11 and driver plate 14, and the size of may command valve rod 20 valve position; Driver plate 14 edges are fixed on down in the valve body 17 with jump ring 13, the maximum mobile position of restriction driver plate 14; There is a circular groove outer in following valve body 17 central cylindrical ladder spaces, interior dress control spring 15, the circular groove bottom has a passage to lead to inlet connecting head 18, it on the control spring 15 driver plate 14, control spring 15 moves by control driver plate 14, and the size of change valve rod 20 valve position reaches the purpose of controlling air inflow.
Upper valve body 7 is connected in the flange mode with following valve body 17, conical surface is processed at the sealing position, form conical surface seal, other has sealing "O 12, strengthen valve seal intensity, upper binding head 22, inlet connecting head 18 and outlet connecting head 16 all are connected threadably with valve body (7,17), seal with teflin tape, sealing nut 4 is connected threadably with adjusting thread bush 6, by seal ring 5 sealings.
Each parts of current limit control valve of the present invention can need carry out parameter designing by related domain general knowledge by using, as the selection of diaphragm, the selection of spring etc.The selection of spring generally can be by the pressure of compress wind, and factors such as the pressure control of device, flow control are determined by the design of related domain general knowledge.
When current limit control valve of the present invention is used for the negative pressure device pressure control, at first, move up with regulating screw thread slide bar 3 regulating and controlling springs 9, make 9 pairs of diaphragms of Regulation spring, 11 no active forces, when the compress wind of＞0.02MPa enters air chamber by upper binding head 22, diaphragm 11 is outwards distortion under the effect of pressure, promote driver plate 14, the pressure that driver plate 14 overcomes control spring 15 moves down, promote valve rod 20, the pressure that valve rod 20 overcomes restraining spring 19 moves down, and has just formed an annular pass like this between valve rod 20 and the valve seat 21, air just can enter pneumatic valve from 16 outflows of outlet connecting head from inlet connecting head 18 through the annular pass.
As compress wind pressure≤0.02MPa, or pneumatic valve rupture of diaphragm and air chamber pressure is reducing, pneumatic valve is out of hand gradually, when valve position is opened gradually, the pressure promotion driver plate 14 that current limit control valve control spring 15 overcomes air chamber moves up, valve rod 20 is broken away from the pressure of driver plate 14, under the promotion of restraining spring 19, move up, close and valve seat 21 between the annular pass, when increase along with vacuum tower degree of vacuum, valve rod 20 overcomes the pressure of restraining spring 19, and forms micro-slit between the valve seat 21, and a spot of air is by the slit flow mistake, the degree of vacuum of vacuum tower is kept within limits all the time, guarantee the proper functioning of vacuum tower, promptly prevented the damage of equipment, avoided burning the generation of tower accident again.
Therefore, the present invention is a kind of simple in structure, utilize the equilibrium relation between air chamber and Regulation spring 9 pressure and control spring 15 pressure, and the active force of 19 pairs of valve rods 20 of restraining spring, just realized that vacuum tower degree of vacuum of the present invention controls automatically, the high-pressure separator of petrochemical industry commercial plant subtracts the control of oil, smart stream tower capacity of reflux, tower still steam flow and boiler feed water, need not configuration signal conversion and control instrument mechanism; Low cost of manufacture need not special processing technology, and process equipment is not had specific (special) requirements yet, can save lot of materials, and the machining factory with general working ability gets final product processing.
Claims (7)
1, a kind of current limit control valve, structure comprise valve body, diaphragm, spring, valve seat, valve rod, pipeline connection mouth, driver plate and adjusting screw thread slide bar; Wherein diaphragm arrangement is in the middle of valve body, valve body is divided into airtight two-part up and down, driver plate is arranged on below the diaphragm, valve rod and valve seat are arranged on below the driver plate, below the driver plate, valve rod and valve seat arranged outside control spring, control spring contacts with driver plate, restraining spring is set below the valve rod, restraining spring supports valve rod and moves upward, Regulation spring is arranged on above the diaphragm, regulate the screw thread slide bar and be arranged on above the Regulation spring, regulate screw thread slide bar regulating and controlling spring driver plate is moved down.
2,, it is characterized in that described valve body comprises upper valve body and following valve body according to the described current limit control valve of claim 1.
3, according to the described current limit control valve of claim 2, it is characterized in that described pipeline connection mouth comprises connection mouth, outlet connection mouth and inlet connection mouth, last connection mouth is connected with the compress wind pipeline, and the outlet connection mouth is connected with control logistics pipeline with the inlet connection mouth.
4, according to the described current limit control valve of claim 2, it is characterized in that described upper valve body and the Placement formation valve body of following valve body with flange, the conical surface is processed at the sealing position, sandwich diaphragm and sealing "O.
5, according to the described current limit control valve of claim 3, it is characterized in that the described connection mouth of going up is arranged on the upper valve body, outlet connection mouth and inlet connection mouth are arranged on down on the valve body.
6, according to the described current limit control valve of claim 5, it is characterized in that described upward connection mouth, outlet connection mouth and inlet connection mouth are female thread structures, corresponding connecting head is set.
7, according to the described current limit control valve of claim 2, it is characterized in that in the described valve body down by being processed into coaxial cylindrical ladder space in the center, restraining spring is housed in the space, cylinder-shaped valve rod and ring-shaped valve seats, restraining spring is enclosed within the lower end of valve rod, valve seat is enclosed within the upper end of valve rod, valve rod is processed into the conical surface near the valve seat place, valve rod can slide in valve seat orifice, stem head is stretched outside valve seat, valve seat is fixed on down in the valve space with the Placement of screw thread, and the bottom, space has a passage to lead to the outlet connection mouth, is circular driver plate and diaphragm on the stem head, by diaphragm and driver plate, the size of control valve stem valve position; There is a circular groove outer in following valve body central cylindrical ladder space, interior dress control spring, and the circular groove bottom has a passage to lead to the inlet connection mouth, is driver plate on the control spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510046713 CN1880807A (en) | 2005-06-17 | 2005-06-17 | Current limit control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510046713 CN1880807A (en) | 2005-06-17 | 2005-06-17 | Current limit control valve |
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| Publication Number | Publication Date |
|---|---|
| CN1880807A true CN1880807A (en) | 2006-12-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510046713 Pending CN1880807A (en) | 2005-06-17 | 2005-06-17 | Current limit control valve |
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| CN (1) | CN1880807A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104456625A (en) * | 2014-11-11 | 2015-03-25 | 北京华清燃气轮机与煤气化联合循环工程技术有限公司 | Air inlet structure for fuel nozzle of gas turbine |
| CN113522391A (en) * | 2021-07-13 | 2021-10-22 | 知弗(上海)科技股份有限公司 | Knockout for chemical analysis detects |
-
2005
- 2005-06-17 CN CN 200510046713 patent/CN1880807A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104456625A (en) * | 2014-11-11 | 2015-03-25 | 北京华清燃气轮机与煤气化联合循环工程技术有限公司 | Air inlet structure for fuel nozzle of gas turbine |
| CN104456625B (en) * | 2014-11-11 | 2017-11-07 | 北京华清燃气轮机与煤气化联合循环工程技术有限公司 | The air intake structure of gas turbine fuel nozzles |
| CN113522391A (en) * | 2021-07-13 | 2021-10-22 | 知弗(上海)科技股份有限公司 | Knockout for chemical analysis detects |
| CN113522391B (en) * | 2021-07-13 | 2022-07-26 | 知弗(上海)科技股份有限公司 | Knockout for chemical analysis detects |
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