CN102278511A - One-way pressure limit valve - Google Patents
One-way pressure limit valve Download PDFInfo
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- CN102278511A CN102278511A CN 201110144436 CN201110144436A CN102278511A CN 102278511 A CN102278511 A CN 102278511A CN 201110144436 CN201110144436 CN 201110144436 CN 201110144436 A CN201110144436 A CN 201110144436A CN 102278511 A CN102278511 A CN 102278511A
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Abstract
The invention relates to a one-way pressure limit valve which comprises a valve body and a valve deck, wherein the valve body is provided with an inlet and an outlet; the inlet and the outlet are communicated with a valve cavity; a valve core is installed in the valve cavity; an imbalance cavity is installed in the valve deck; the interior of the imbalance cavity is in sliding fit with a piston; a valve rod cavity is installed in the piston; a valve rod of the valve core is in sliding fit with the interior of the valve rod cavity; a spring is installed between the piston and the valve deck; a pressure balance cavity is installed in the valve deck; the cross sectional area of the pressure balance cavity is equal to a difference between inlet area and the cross sectional area of the imbalance cavity; a disc ring in sliding fit with the interior of the pressure balance cavity is installed on the piston; a pressure balance passageway communicated with the pressure balance cavity is installed in the valve core; a one-way sealed ball is installed in the pressure balance passageway. The pressure balance cavity of the invention is used for bearing most inlet pressure and the spring is used for bearing a small part of pressure so that the spring rate and the size are very small; and relative pressure difference between initial open of the valve core and full open of the valve core can be reduced so that the volume of the whole one-way pressure limit valve is very small and exquisite; and the cost is low.
Description
Technical field
The present invention relates to valve, specifically a kind of one-way pressure-limit valve.
Background technique
One-way pressure-limit valve is widely used in industries such as weaving, pharmacy, chemical industry, oil, compressor manufacturing, has the facility of requirement all can use to pipeline gas minimum pressure.The main effect of one-way pressure-limit valve is exactly the pressure minimum of pilot line gas and has one-way function.When one-way pressure-limit valve import pressurized during greater than setting pressure (or limit pressure), this valve is promptly opened automatically, and pressed gas enters next pipe-line system by this valve; When one-way pressure-limit valve outlet pressure during greater than inlet pressure, one-way pressure-limit valve can promptly be in closed condition, and blocking-up gas flows backwards.
As shown in Figure 1, be more common in the market a kind of one-way pressure-limit valve, belong to mechanical type control structure, it mainly comprises valve body 1 and valve gap 14, valve body 1 inside is provided with valve pocket, have the import 21 that is connected with valve pocket on the valve body 1 and export 18, be provided with the spool 3 that is complementary with import 21 in the valve pocket, spool 3 links to each other with the pressure limiting mechanism that is made up of piston 7, spring 8 and valve gap 14.The working principle of this valve is: pressed gas acts on this spool 3, spool 3 accepts to come from the pressure of spring 8 by piston 7, when import 21 acts on pressure on the spool 3 greater than the active force of spring 8, spool 3 moves to the compression direction of spring 8 along uneven chamber 15 with piston 7, open the passage between import 21 and the outlet 18, gas flows into outlet 18 by import 21.Its working procedure is the movement process of gas pressure to the active force of spring 8.In this movement process, spool 3 just reaches and all opens needed pressure is the pressure of import 21 pressure when overcoming spring force.
The shortcoming of this one-way pressure-limit valve is: because spring force can constantly increase along with the compression of spring 8, so spool 3 will reach when all opening, import 21 pressure just must constantly increase, and the pressure difference when this has just caused spool 3 just to hold with standard-sized sheet can be increasing.Allow its pressure difference dwindle, under the constant situation of compression area, only reduce the rigidity of spring 8, increase the number of active coils of spring 8,, also have only the length that increases spring 8 to solve for not influencing the stroke of spool 3.Increase (having arrived latus rectum especially more than 40) if do the latus rectum of valve like this, the volume of valve will be done increasingly, is being applied to the volume size that some place will have influence on complete machine, and cost of production is geometric form and rises, become the bottleneck of waste resource, also increased the manufacture cost of self.And for the valve of big latus rectum, thisly dwindle pressure reduction, because the characteristic of spring can't change by what reduce that spring rate dwindles that the way of pressure difference can only accomplish trace.In addition, overcome the one-way pressure-limit valve of the one-way pressure-limit valve, particularly big latus rectum of gas pressure fully by spring force,, must take certain safety measure to the release of spring force, to avoid the dangerous release of spring force because spring force can be done very greatly.
Summary of the invention
The present invention is directed to the problems referred to above, the one-way pressure-limit valve that a kind of spring size is little, pressure reduction is little, valve volume is little is provided.
According to technological scheme of the present invention: a kind of one-way pressure-limit valve comprises valve body and valve gap; Described valve inner is provided with valve pocket, has the import and the outlet that are connected with described valve pocket on the described valve body, is provided with the spool that can open and close described import in the described valve pocket; Be provided with the uneven chamber that communicates with atmosphere in the described valve gap, be sliding combined with piston in the described uneven chamber, be provided with valve-rod cavity in the described piston, the valve stem slides of described spool is engaged in the described valve-rod cavity, is provided with spring between described piston and the described valve gap; Be provided with pressure balance chamber in the described valve gap, the cross-section area of described pressure balance chamber equals the cross-section area that described inlet-duct area deducts described uneven chamber, described piston is provided with the dish ring that is slidingly fitted in the described pressure balance chamber, have the pressure equalisation passage that communicates with described pressure balance chamber in the described spool, be provided with the one-way sealing ball in the described pressure equalisation passage.
Be provided with seal spool spare between described spool and the described import.
Be provided with the air cavity Sealing between described piston and the described uneven chamber.
Be provided with the counter balance pocket Sealing between described dish ring and the described pressure balance chamber.
Be threaded between described valve gap and the described valve body or flange is connected, be provided with valve seal spare at its junction point.
Described spring is positioned at described pressure balance chamber, and an end of described spring is resisted against on the described dish ring, and its other end is resisted against on the described valve gap.
Described spring is positioned at described uneven chamber, and an end of described spring is resisted against on the described piston end face, and its other end is resisted against on the described valve gap.
Be provided with axle sleeve in the described piston, the valve stem slides of described spool is engaged in the described axle sleeve.
The outer end of the valve rod of described spool is provided with guide ring, and described guide ring is slidingly fitted in the described valve-rod cavity.
Described valve body is provided with the inlet pressure test hole that communicates with described import, and the outlet pressure test hole that communicates with described valve pocket.
Technique effect of the present invention is: the present invention adopts the principle of mobile equilibrium rule, in valve gap, be provided with pressure balance chamber, bear most of inlet pressure by pressure balance chamber, spring only bears the suffered very little a part of power in uneven chamber, therefore, spring rate can be very little, and what the design size of spring will be very is small and exquisite; Relative pressure difference when spool is just opened with the spool standard-sized sheet will reduce, thereby the design volume of whole one-way pressure-limit valve also can be very small and exquisite, both reduced cost, on performance, improved major step again, do not worried also during use that elastic force discharged the unsafe factor that brings.
Description of drawings
Fig. 1 is the structural representation of existing one-way pressure-limit valve.
Fig. 2 is a structural representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is further described.
Among Fig. 1, Fig. 2, comprise valve body 1, seal spool spare 2, spool 3, axle sleeve 4, counter balance pocket Sealing 5, bolt 6, piston 7, spring 8, one-way sealing ball 9, guide ring 10, bolt 11, air cavity Sealing 12, valve seal spare 13, valve gap 14, uneven chamber 15, valve-rod cavity 16, pressure balance chamber 17, outlet 18, valve pocket 19, outlet pressure test hole 20, import 21, pressure equalisation passage 22, inlet pressure test hole 23, bolt 24, dish ring 25 etc.
As shown in Figure 2, the present invention is a kind of one-way pressure-limit valve, comprise valve body 1 and valve gap 14, can adopt being connected between valve gap 14 and the valve body 1 be threaded or multiple pattern such as flange connection, and be provided with valve seal spare 13 at its junction point according to the size of one-way pressure-limit valve.
Valve body 1 inside is provided with valve pocket 19, has the import 21 that is connected with valve pocket 19 and export 18 on valve body 1, and import 21 also can be selected form of flanges or thread forms for use according to system's needs with the Placement of outlet 18.Be provided with the spool 3 that to open and to close import 21 in the valve pocket 19, be provided with seal spool spare 2 between spool 3 and the import 21.
Also be provided with the inlet pressure test hole 23 that communicates with import 21 on the valve body 1, and the outlet pressure test hole 20 that communicates with valve pocket 19.Inlet pressure test hole 23 and outlet pressure test hole 20 are used to connect the pressure value that transmits one-way pressure-limit valve import 21 and export 18 two positions, without the time respectively with bolt 24 and bolt 6 sealings.
The outer end of the valve rod of spool 3 can also be provided with guide ring 10, and guide ring 10 is slidingly fitted in the valve-rod cavity 16.Can also be provided with oilless bushing 4 in the piston 7, the valve stem slides of spool 3 is engaged in the axle sleeve 4.The effect of oilless bushing 4 and guide ring 10 is to reduce the friction of spool 3 motions and increase the durability of 7 frictions of spool 3 and piston and the vertical enduring quality in the movement process, simultaneously, if the selection of material is (wear resistance is good) suitably, also can remove oilless bushing 4 and guide ring 10.
The present invention is provided with pressure balance chamber 17 in valve gap 14, the cross-section area in the cross-section area=import 21 areas-uneven chamber 15 of pressure balance chamber 17; Piston 7 is provided with the dish ring 25 that is slidingly fitted in the pressure balance chamber 17, is provided with counter balance pocket Sealing 5 between dish ring 25 and the pressure balance chamber 17; In spool 3, have the pressure equalisation passage 22 that communicates with pressure balance chamber 17, be provided with one-way sealing ball 9 in the pressure equalisation passage 22.
Be provided with spring 8 between piston 7 and the valve gap 14.Spring 8 following dual mode is installed: a kind of is that spring 8 is positioned at pressure balance chamber 17, and an end of spring 8 is resisted against on the dish ring 25, and its other end is resisted against on the valve gap 14; Another kind is that spring 8 is positioned at uneven chamber 15, and an end of spring 8 is resisted against on the end face of piston 7, and its other end is resisted against on the valve gap 14.In two kinds of mounting types of spring 8, first kind of mode effect is best.
Working principle of the present invention is to adopt the principle of mobile equilibrium rule, utilize the active force and the reaction force of gas, act in accordance with the change in pressure of gas self, at piston 7 parts of pressurized in spring 8, transform pressure balance chamber 17 as, bear most of power by pressure balance chamber 17,8 on spring bears very little a part of power of the uneven chamber of residue 15 areas, and the active force of pressure balance chamber 17 is only main active force.Pressure in the pressure balance chamber 17 are that just the pressure with import 21 keeps proportional relationship along with the change in pressure of import 21 when one-way sealing ball 9 is opened, along with the pressure of import 21 raises and raises, reduce and reduce.So just formed equilibrium relation to the active force and the reaction force of spool 3, the power of two aspects is cancelled out each other, spring force only need overcome the power of the uneven chamber of core 15 areas, cross-section area=import 21 areas of the cross-section area+pressure balance chamber 17 in uneven chamber 15, the area in uneven chamber 15 can be done very for a short time, and therefore, the demand of spring force will be very little, spring 8 rigidity also can be done very for a short time, and what the design size of spring 8 will be very is small and exquisite.Relative pressure difference when spool 3 is just opened with spool 3 standard-sized sheets will reduce, thereby the design volume of whole one-way pressure-limit valve also can be very small and exquisite, both reduced cost, on performance, improved major step again, do not worry during use that elastic force discharges the unsafe factor that brings yet, make the machine set system design of use one-way pressure-limit valve more reasonable.
Working procedure of the present invention is as follows: pressed gas is acted on the one-way pressure-limit valve spool 3 by import 21 places, the pressure equalisation passage 22 of part pressed gas on spool 3 enters pressure balance chamber 17, wherein pass through one-way sealing ball 9, pressed gas can only unidirectionally be entered, and pressure balance chamber 17 gas pressures form reaction force with the active force that acts on the spool 3.Pressure before spool 3 is opened in the pressure balance chamber 17 equates with import 21 pressure all the time, when import 21 pressure will be opened spool 3 and promptly act on power on the spool 3 center areas greater than spring 8 active forces that overcome uneven chamber 15, import 21 pressure will promote spool 3, spool 3 and piston 7 move to force direction, open valve inlet 21, gas is gone out by one-way pressure-limit valve outlet 18.This process is because the area in open to atmosphere uneven chamber 15 is very little, the rigidity of spring 8 is also just very low, the variation of the spring force during spring 8 compression will be very little, also can be very little so promote this pressure difference value that spool 3 is opened to when all opening at import 21 pressure.Pressure balance chamber 17 pressure were identical with import 21 pressure before spool 3 was opened, after spool 3 is opened, when if valve outlet port 18 pressure are higher than valve import 21 pressure, nonreturn valve core 3 will be closed rapidly, spool 3 is thrown off with piston 7, export in the gap feed pressure counter balance pocket 17 of 18 gases by spool 3 and piston 7, pressure equalisation passage 22 is by ball sealer 9 unidirectional closing, stop counter balance pocket 17 gases to blow back into import 21, piston 7 is owing to the difference (a part of uneven chamber 15 areas that act on the piston 7 are open to atmosphere) of area, so piston 7 is opened at this moment.The pressure of (or in valve pocket) is relevant in the position of piston 7 and the pipeline, as long as open when the pressure of (or in valve pocket) surpasses setting pressure in the pipeline, the action of spool 3 is just more flexible like this.As long as outlet 18 ducted pressure reduce or import 21 pressure raise when surpassing setting pressure, spool 3 will almost unresistedly be opened rapidly; Otherwise as long as outlet 18 ducted pressure raise or import 21 pressure when being reduced to setting pressure, spool 3 will be closed rapidly.
Claims (10)
1. an one-way pressure-limit valve comprises valve body (1) and valve gap (14); Described valve body (1) inside is provided with valve pocket (19), have the import (21) and the outlet (18) that are connected with described valve pocket (19) on the described valve body (1), be provided with the spool (3) that to open and to close described import (21) in the described valve pocket (19); Be provided with the uneven chamber (15) that communicates with atmosphere in the described valve gap (14), be sliding combined with piston (7) in the described uneven chamber (15), be provided with valve-rod cavity (16) in the described piston (7), the valve stem slides of described spool (3) is engaged in the described valve-rod cavity (16), be provided with spring (8) between described piston (7) and the described valve gap (14), it is characterized in that: be provided with pressure balance chamber (17) in the described valve gap (14), the cross-section area of described pressure balance chamber (17) equals the cross-section area that described import (21) area deducts described uneven chamber (15), described piston (7) is provided with the dish ring (25) that is slidingly fitted in the described pressure balance chamber (17), have the pressure equalisation passage (22) that communicates with described pressure balance chamber (17) in the described spool (3), be provided with one-way sealing ball (9) in the described pressure equalisation passage (22).
2. according to the described one-way pressure-limit valve of claim 1, it is characterized in that: be provided with seal spool spare (2) between described spool (3) and the described import (21).
3. according to the described one-way pressure-limit valve of claim 1, it is characterized in that: be provided with air cavity Sealing (12) between described piston (7) and the described uneven chamber (15).
4. according to the described one-way pressure-limit valve of claim 1, it is characterized in that: be provided with counter balance pocket Sealing (5) between described dish ring (25) and the described pressure balance chamber (17).
5. according to the described one-way pressure-limit valve of claim 1, it is characterized in that: be threaded between described valve gap (14) and the described valve body (1) or flange is connected, be provided with valve seal spare (13) at its junction point.
6. according to the described one-way pressure-limit valve of claim 1, it is characterized in that: described spring (8) is positioned at described pressure balance chamber (17), and an end of described spring (8) is resisted against on the described dish ring (25), and its other end is resisted against on the described valve gap (14).
7. according to the described one-way pressure-limit valve of claim 1, it is characterized in that: described spring (8) is positioned at described uneven chamber (15), and an end of described spring (8) is resisted against on the end face of described piston (7), and its other end is resisted against on the described valve gap (14).
8. according to the described one-way pressure-limit valve of claim 1, it is characterized in that: be provided with axle sleeve (4) in the described piston (7), the valve stem slides of described spool (3) is engaged in the described axle sleeve (4).
9. according to the described one-way pressure-limit valve of claim 1, it is characterized in that: the outer end of the valve rod of described spool (3) is provided with guide ring (10), and described guide ring (10) is slidingly fitted in the described valve-rod cavity (16).
10. according to the described one-way pressure-limit valve of claim 1, it is characterized in that: described valve body (1) is provided with the inlet pressure test hole (23) that communicates with described import (21), and the outlet pressure test hole (20) that communicates with described valve pocket (19).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110144436A CN102278511B (en) | 2011-05-31 | 2011-05-31 | One-way pressure limit valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110144436A CN102278511B (en) | 2011-05-31 | 2011-05-31 | One-way pressure limit valve |
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| Publication Number | Publication Date |
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| CN102278511A true CN102278511A (en) | 2011-12-14 |
| CN102278511B CN102278511B (en) | 2012-10-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110144436A Expired - Fee Related CN102278511B (en) | 2011-05-31 | 2011-05-31 | One-way pressure limit valve |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103591340A (en) * | 2012-10-18 | 2014-02-19 | 北京熊川阀门制造有限公司 | One-way valve |
| CN104110411A (en) * | 2013-04-19 | 2014-10-22 | 刘立群 | Check pressure valve |
| CN105318049A (en) * | 2014-07-30 | 2016-02-10 | 上海连成（集团）有限公司 | Self-exhaust type check valve of vertical automatic control self-priming pump |
| CN107255095A (en) * | 2017-07-07 | 2017-10-17 | 中国煤炭科工集团太原研究院有限公司 | The reverse aqueous medium hydraulic control one-way valve of ultralow pressure |
| CN107420368A (en) * | 2017-09-29 | 2017-12-01 | 宁波克泰液压有限公司 | Adjustable compensation formula one-way flow valves |
| CN109566676A (en) * | 2018-12-01 | 2019-04-05 | 陈宝光 | A kind of unidirectional supply structure of food |
| CN117469447A (en) * | 2023-12-28 | 2024-01-30 | 斯丹德汽车系统（苏州）有限公司 | Pressure limiting valve and output stability control method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19604889A1 (en) * | 1996-02-10 | 1997-08-14 | Bosch Gmbh Robert | Hydraulic pressure-limiting valve |
| JPH10339383A (en) * | 1997-04-11 | 1998-12-22 | Kawaju Bosai Kogyo Kk | Rapid speed opening pressure governing valve |
| US20060180207A1 (en) * | 2003-01-10 | 2006-08-17 | Naoki Itano | Rapidly opening pressure regulating valve, fire extinguishing apparatus using the pressure regulating valve, high-pressure gas cylinder device, and rapid fluid feeding device |
| CN2895804Y (en) * | 2006-03-07 | 2007-05-02 | 梅锦月 | Horizontal admission controller |
| CN201190822Y (en) * | 2008-03-21 | 2009-02-04 | 谢庆俊 | Pressure-limiting valve |
| CN202091586U (en) * | 2011-05-31 | 2011-12-28 | 梅锦月 | One-way pressure-limiting valve |
-
2011
- 2011-05-31 CN CN201110144436A patent/CN102278511B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19604889A1 (en) * | 1996-02-10 | 1997-08-14 | Bosch Gmbh Robert | Hydraulic pressure-limiting valve |
| JPH10339383A (en) * | 1997-04-11 | 1998-12-22 | Kawaju Bosai Kogyo Kk | Rapid speed opening pressure governing valve |
| US20060180207A1 (en) * | 2003-01-10 | 2006-08-17 | Naoki Itano | Rapidly opening pressure regulating valve, fire extinguishing apparatus using the pressure regulating valve, high-pressure gas cylinder device, and rapid fluid feeding device |
| CN2895804Y (en) * | 2006-03-07 | 2007-05-02 | 梅锦月 | Horizontal admission controller |
| CN201190822Y (en) * | 2008-03-21 | 2009-02-04 | 谢庆俊 | Pressure-limiting valve |
| CN202091586U (en) * | 2011-05-31 | 2011-12-28 | 梅锦月 | One-way pressure-limiting valve |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103591340A (en) * | 2012-10-18 | 2014-02-19 | 北京熊川阀门制造有限公司 | One-way valve |
| CN104110411A (en) * | 2013-04-19 | 2014-10-22 | 刘立群 | Check pressure valve |
| CN104110411B (en) * | 2013-04-19 | 2016-08-24 | 刘立群 | Inverse-stopping type pressure valve |
| CN105318049A (en) * | 2014-07-30 | 2016-02-10 | 上海连成（集团）有限公司 | Self-exhaust type check valve of vertical automatic control self-priming pump |
| CN107255095A (en) * | 2017-07-07 | 2017-10-17 | 中国煤炭科工集团太原研究院有限公司 | The reverse aqueous medium hydraulic control one-way valve of ultralow pressure |
| CN107255095B (en) * | 2017-07-07 | 2019-07-02 | 中国煤炭科工集团太原研究院有限公司 | The reversed aqueous medium hydraulic control one-way valve of ultralow pressure |
| CN107420368A (en) * | 2017-09-29 | 2017-12-01 | 宁波克泰液压有限公司 | Adjustable compensation formula one-way flow valves |
| CN109566676A (en) * | 2018-12-01 | 2019-04-05 | 陈宝光 | A kind of unidirectional supply structure of food |
| CN109566676B (en) * | 2018-12-01 | 2021-09-07 | 陈宝光 | One-way food supply structure |
| CN117469447A (en) * | 2023-12-28 | 2024-01-30 | 斯丹德汽车系统（苏州）有限公司 | Pressure limiting valve and output stability control method thereof |
| CN117469447B (en) * | 2023-12-28 | 2024-04-16 | 斯丹德汽车系统（苏州）有限公司 | Pressure limiting valve and output stability control method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102278511B (en) | 2012-10-03 |
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