CN102943909A - Differential type water hydraulic relief valve - Google Patents
Differential type water hydraulic relief valve Download PDFInfo
- Publication number
- CN102943909A CN102943909A CN2012103989454A CN201210398945A CN102943909A CN 102943909 A CN102943909 A CN 102943909A CN 2012103989454 A CN2012103989454 A CN 2012103989454A CN 201210398945 A CN201210398945 A CN 201210398945A CN 102943909 A CN102943909 A CN 102943909A
- Authority
- CN
- China
- Prior art keywords
- valve
- valve seat
- spool
- rank
- spring
- 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.)
- Granted
Links
Images
Landscapes
- Safety Valves (AREA)
- Details Of Valves (AREA)
Abstract
The invention provides a differential type water hydraulic relief valve and belongs to a pressure control valve in a water hydraulic system; and problems of vibration, noises and poor working stability in the traditional direct-acting relief valve are solved. In a first kind of differential type water hydraulic relief valve, a valve seat, a valve core, a spring and a spring seat are mounted in a valve body in sequence from left to right; the right end of the valve body is sealed; a cylindrical cushion block is embedded at the left end of the cavity of the valve body; a left end cover is connected with the left end surface of the valve body by a bolt; and an adjusting screw rod and the left end cover are matched with each other by threads and pushed against the cylindrical cushion block. A second kind of differential type water hydraulic relief valve is different from the first kind of differential type water hydraulic relief valve in the following aspects: the left end of the valve body is sealed, a right end cover is connected with the right end of the cavity of the valve body by threads, a spring seat is embedded in the right end cover, and bottom surfaces of an adjusting screw rod and the right end cover are matched with each other by threads and pushed against the spring seat. The differential type water hydraulic relief valve provided by the invention has the advantages of small leakage, good cavitation resistance, small vibration, low noise, high pressure adjusting precision, good working stability and small spring force at high pressure and is suitable for medium and high pressure water hydraulic systems.
Description
Technical field
The invention belongs to the pressure controlled valve in the water hydraulic system, be applicable to the water hydraulic system with seawater, fresh water, the high working medium such as water base.
Background technique
Relief valve is pressure control valve commonly used in the hydraulic system, can be used as level pressure relief valve or safety valve, and traditional relief valve adopts hydraulic oil to make the work medium more.When relief valve adopts water (water base) medium when (comprising seawater, fresh water or high water base etc.), the vibration that produces, noise and working stability problem are very serious.Except the reason of air pockets erosion, the reason of generation is multiple in addition: 1) because the viscosity of water is low, viscous damping is little; 2) density of water, Young's modulus are large than mineral oil, and " water attack " phenomenon is serious; 3) medium goes out stream and spring force and departs from the radial force that the reason such as spool axle center produces and make the spool polarization valve port is inhomogeneous; 4) because the viscosity of water is low, the leakage at valve port place is larger.
Fig. 3 is One-stage Water Hydraulic Relief Valve (the Trostmann E..Water Hydraulics Control Technology.Marcel Dekker that Denmark Danfoss company produces, Inc., New York, 1996), comprise valve body 1, spring 5, spring seat 6, damping cavity 8, adjusting screw rod 10, right end cap 11, valve seat 12, dull and stereotyped spool 13, damping sleeve 14, damper rod 15 and pogo barrel 16.
This valve has improved the working stability of valve to a certain extent by in the spool rear end damping cavity being set.But spool is easy to polarization, and consequent vibration, noise and working stability problem still exist.The material that adopts of this valve can not be used seawater in addition, is only applicable to fresh water or the high not strong medium of corrosivity such as water base.
For common direct-acting overflow valve and since spring force directly with the hydraulic coupling comparison, when the working pressure of relief valve was higher, required spring force was very large.Therefore, bring very large difficulty for spring design and manufacturing.
Summary of the invention
The invention provides two kinds of differential type water hydraulic relief valves, solve the problem of vibration, noise and the poor work stability of existing direct-acting overflow valve existence, reduce valve port leakage, cavitation erosion, vibration, noise and pressure adjusting spring rigidity, improve the working stability of valve, be applicable to simultaneously the strong low viscosity media of corrosivity such as seawater.
The first differential type water hydraulic relief valve provided by the present invention comprises valve body, valve seat, spool, spring, spring seat and adjusting screw rod, and valve seat, spool, spring and spring seat are housed in the described valve body from left to right successively; It is characterized in that:
Described body cavity is circular port, and circular port middle part has annular undercut groove, and valve body side diverse location has respectively the liquid entering hole that is communicated with described annular undercut groove and the liquid outlet of connecting valve intracoelomic cavity; Described valve seat is shaped as cylinder, outside diameter of cylinder and body cavity circular port internal diameter coupling, valve base cavity is three coaxial rank step holes, wherein, the diameter in hole, right rank is greater than the diameter in hole, left rank, the right aperture in hole, right rank is conical surface, and the valve seat side has the water inlet in radially equally distributed connection scala media hole; Described spool is made of tail end cylinder, conical section and the head end cylinder of one, tail end body diameter and the left rank of described valve seat bore dia are complementary, conical section maximum radial diameter of section is greater than the diameter in hole, described right rank, the cone angle of conical section is less than the cone angle of the conical surface in right aperture, hole, the right rank of valve seat, spool has axial hole, the internal diameter of the corresponding tail end column part of axial hole increases, and damper wherein is installed; Hole, the left rank of spool tail end cylinder and valve seat is slidingly matched, and the conical surface in right aperture, hole, the right rank of conical section and valve seat forms the valve port of cone valve structure; Valve seat and body cavity are slidingly matched, and the water inlet of valve seat is positioned at valve body annular undercut groove relevant position;
The sealing of described valve body right-hand member, spring seat is embedded in the right bottom surface of body cavity, and spring is placed between spool head end cylinder and the spring seat and both are spacing by rear;
Described body cavity left end is built-in with the cylindrical cushion block that is slidingly matched with body cavity, and cylindrical cushion block seals the left side of described valve seat, and the valve base cavity between cylindrical cushion block and the spool tail end cylinder consists of damping cavity;
Left end cap by screw be connected the valve body left side and connect, adjusting screw rod and left end cap screw-thread fit are also withstood described cylindrical cushion block.
The second differential type water hydraulic relief valve provided by the present invention comprises valve body, valve seat, spool, spring, spring seat and adjusting screw rod, and valve seat, spool, spring and spring seat are housed in the described valve body from left to right successively; It is characterized in that:
Described body cavity is circular port, and circular port middle part has annular undercut groove, and valve body side diverse location has respectively the liquid entering hole that is communicated with described annular undercut groove and the liquid outlet of connecting valve intracoelomic cavity; Described valve seat is shaped as cylinder, outside diameter of cylinder and body cavity circular port internal diameter coupling, valve base cavity is three coaxial rank step holes, the diameter in hole, right rank is greater than the diameter in hole, left rank, the right aperture in hole, right rank is conical surface, and the valve seat side has the water inlet in radially equally distributed connection scala media hole; Described spool is made of tail end cylinder, conical section and the head end cylinder of one, tail end body diameter and the left rank of described valve seat bore dia are complementary, conical section maximum radial diameter of section is greater than the diameter in hole, described right rank, the cone angle of conical section is less than the cone angle of the conical surface in right aperture, hole, the right rank of valve seat, spool has axial hole, the internal diameter of the corresponding tail end column part of axial hole increases, and damper wherein is installed; Hole, the left rank of spool tail end cylinder and valve seat is slidingly matched, and the conical surface in right aperture, hole, the right rank of conical section and valve seat forms the valve port of cone valve structure; Valve seat and body cavity are slidingly matched, and the water inlet of valve seat is positioned at valve body annular undercut groove relevant position;
Right end cap by screw thread be connected the body cavity right-hand member and connect, the right end cap left end is shaped as drum, the right end cap right-hand member is shaped as outer hexagonal prism body, and spring seat is embedded in the right end cap inner chamber and is slidingly matched with the right end cap inner chamber, and spring is placed between spool head end cylinder and the spring seat and both are spacing by rear; Adjusting screw rod and right end cap bottom surface screw-thread fit are also withstood described spring seat;
Described valve body left end sealing, the body cavity between the left side of described body cavity left end bottom surface and described valve seat consists of damping cavity.
Described the first and the second differential type water hydraulic relief valve, wherein:
Described damper is the cylindrical body with axial hole, and the aperture of axial hole is 0.6～1.6mm;
Described valve seat adopts titanium alloy, monel or Austenitic Stainless Steel to be processed into, and described spool adopts and is processed into through Martensitic Stain Less Steel or the Precipitation-hardening Stainless Steel of enhancement process.
When the present invention worked, high pressure water entered from liquid entering hole, and during working pressure that the differential hydraulic power on acting on spool is set greater than spring, spool is opened, and water enters spring chamber through valve port, flows out finally by liquid outlet.Spool is in a certain equilibrium position under the effect of hydraulic coupling, spring force, frictional force.The pressure of liquid entering hole can move valve seat and spool by adjusting screw rod and cushion block, and then the pre compressed magnitude of Regulation spring is set.Spool is in Dynamic Regulating Process, polarization when spool tail end cylinder can suppress the spool unlatching, the simultaneously variation of damping cavity volume will cause that the pressure in this chamber changes, thereby produce an additional forces with the valve core movement opposite direction, increase the damping of valve core movement, improved the working stability of spool.Conical surface on the spool and tail end cylinder respectively with valve seat on hole, right rank and hole, left rank consist of differential hydraulic pressure area, the suffered hydraulic action of spool in the time of can greatly reducing under high pressure to work, thus greatly reduce spring rate and spring force.
In order to reduce to leak, spool of the present invention and valve seat consist of the cone valve structure of good airproof performance, for reducing the spool polarization, are designed with the tail end cylinder at the spool tail end, and form matching gap with the valve seat endoporus, provide guiding to valve core movement.In order to improve the working stability of spool, be drilled with through hole in the spool and damper is installed; Cavity between cushion block, valve seat, the spool forms damping cavity, and the pressure when utilizing valve core movement in the damping cavity changes to increase the kinetic damping of spool.
Be the harm that alleviates air pocket and reduce to cavitate, taked following measures: 1) spool and valve seat all are designed to cone structure at the valve port place, and the spool cone angle is slightly less than the valve seat cone angle, are conducive to suppress air pocket; 2) valve seat and spool adopt soft hard material pairing, valve seat adopts the lower titanium alloy of hardness, monel (such as Monel etc.) or Austenitic Stainless Steel (such as 1Cr18Ni9Ti) to be processed into, spool adopts Martensitic Stain Less Steel (being only applicable to fresh water or high water base) or the Precipitation-hardening Stainless Steel through enhancement process to be processed into, and is conducive to the destruction that reduces to cavitate.
For reducing spring rate, cylindrical body that the diameter of spool axially-aligned is different and cone and valve seat consist of differential valve port active area, under the uniform pressure condition, the hydraulic action that acts on the spool greatly reduces, thereby can reduce spring rate, increase the pressure regulation precision, make things convenient for the spring design manufacturing.
The present invention compares with similar overflow, leak little, cavitation resistive property good, vibration is little, noise is low, the pressure regulation precision is high, good operating stability, spring force required when high pressure is little, be applicable to in seawater, fresh water, the high mesohigh water hydraulic system that makes the work medium such as water base as pressure controlled valve.
Description of drawings
Fig. 1 is the structural representation of first embodiment of the invention;
Fig. 2 is the structural representation of second embodiment of the invention;
Fig. 3 is existing Danfoss One-stage Water Hydraulic Relief Valve structural representation.
Embodiment
The present invention is further described below in conjunction with drawings and Examples.
As shown in Figure 1, first embodiment of the present invention comprises valve body 1, valve seat 2, spool 3, spring 5, spring seat 6 and adjusting screw rod, and valve seat 2, spool 3, spring 5 and spring seat 6 are housed in the described valve body 1 from left to right successively;
Described valve body 1 inner chamber is circular port, and circular port middle part has annular undercut groove 1-1, and valve body side diverse location has respectively the liquid entering hole P that is communicated with described annular undercut groove 1-1 and the liquid outlet T of connecting valve intracoelomic cavity; Described valve seat 2 is shaped as cylinder, outside diameter of cylinder and body cavity circular port internal diameter coupling, valve base cavity is three coaxial rank step holes, the diameter of right rank hole 2-3 is greater than the diameter of left rank hole 2-2, the right aperture of right rank hole 2-3 is conical surface, and the valve seat side has the water inlet 2-4 of 4 radially equally distributed connection scala media hole 2-1; Described spool 3 is made of tail end cylinder 3-1, conical section 3-2 and the head end cylinder 3-3 of one, tail end cylinder 3-1 diameter and hole, the left rank of described valve seat 2-2 diameter are complementary, conical section 3-2 maximum radial diameter of section is greater than the diameter of described right rank hole 2-3, the cone angle of conical section is less than the cone angle of the conical surface in the right aperture of 2-3, hole, the right rank of valve seat, spool has axial hole 3-4, the internal diameter of the corresponding tail end column part of axial hole increases, and damper 4 wherein is installed; Spool 3 tail end cylinder 3-1 and the left rank of valve seat hole 2-2 are slidingly matched, and the conical surface in the right aperture of 2-3, hole, the right rank of conical section 3-2 and valve seat forms the valve port of cone valve structure; Valve seat 2 is slidingly matched with body cavity, and the water inlet 2-4 of valve seat is positioned at valve body annular undercut groove 1-1 relevant position;
The sealing of described valve body 1 right-hand member, spring seat 6 is embedded in the right bottom surface of body cavity, and spring 5 is placed between spool head end cylinder 3-3 and the spring seat 6 and both are spacing by rear;
Described body cavity left end is built-in with the cylindrical cushion block 7 that is slidingly matched with body cavity, the left side of the described valve seat 2 of cylindrical cushion block 7 sealings, and the valve base cavity between cylindrical cushion block 7 and the spool tail end cylinder 3-1 consists of damping cavity 8;
Described damper 4 is for having the cylindrical body of axial hole, and the aperture of axial hole is 0.6mm;
Described valve seat adopts Austenitic Stainless Steel to be processed into, and described spool adopts Precipitation-hardening Stainless Steel to be processed into.
As shown in Figure 2, second embodiment of the present invention comprises valve body 1, valve seat 2, spool 3, spring 5, spring seat 6 and adjusting screw rod, and valve seat 2, spool 3, spring 5 and spring seat 6 are housed in the described valve body 1 from left to right successively;
Described valve body 1 inner chamber is circular port, and circular port middle part has annular undercut groove 1-1, and valve body side diverse location has respectively the liquid entering hole P that is communicated with described annular undercut groove 1-1 and the liquid outlet T of connecting valve intracoelomic cavity; Described valve seat 2 is shaped as cylinder, outside diameter of cylinder and body cavity circular port internal diameter coupling, valve base cavity is three coaxial rank step holes, the diameter of right rank hole 2-3 is greater than the diameter of left rank hole 2-2, the right aperture of right rank hole 2-3 is conical surface, and the valve seat side has the water inlet 2-4 of 4 radially equally distributed connection scala media hole 2-1; Described spool 3 is made of tail end cylinder 3-1, conical section 3-2 and the head end cylinder 3-3 of one, tail end cylinder 3-1 diameter and hole, the left rank of described valve seat 2-2 diameter are complementary, conical section 3-2 maximum radial diameter of section is greater than the diameter of described right rank hole 2-3, the cone angle of conical section is less than the cone angle of the conical surface in the right aperture of 2-3, hole, the right rank of valve seat, spool has axial hole 3-4, the internal diameter of the corresponding tail end column part of axial hole increases, and damper 4 wherein is installed; Spool 3 tail end cylinder 3-1 and the left rank of valve seat hole 2-2 are slidingly matched, and the conical surface in the right aperture of 2-3, hole, the right rank of conical section 3-2 and valve seat forms the valve port of cone valve structure; Valve seat 2 is slidingly matched with body cavity, and the water inlet 2-4 of valve seat is positioned at valve body annular undercut groove 1-1 relevant position;
Described valve body 1 left end sealing, the body cavity between the left side of described body cavity left end bottom surface and described valve seat 2 consists of damping cavity 8.
Described damper 4 is for having the cylindrical body of axial hole, and the aperture of axial hole is 1.6mm;
Described valve seat adopts monel to be processed into, and described spool adopts and is processed into through the Martensitic Stain Less Steel of enhancement process.
Claims (4)
1. the first differential type water hydraulic relief valve, comprise valve body (1), valve seat (2), spool (3), spring (5), spring seat (6) and adjusting screw rod (10), cushion block (7), valve seat (2), spool (3), spring (5) and spring seat (6) are housed in the described valve body (1) from left to right successively; It is characterized in that:
Described valve body (1) inner chamber is circular port, circular port middle part has annular undercut groove (1-1), and valve body side diverse location has respectively the liquid entering hole (P) that is communicated with described annular undercut groove (1-1) and the liquid outlet (T) of connecting valve intracoelomic cavity; Described valve seat (2) is shaped as cylinder, outside diameter of cylinder and body cavity circular port internal diameter coupling, valve base cavity is three coaxial rank step holes, the diameter in hole, right rank (2-3) is greater than the diameter in hole, left rank (2-2), the right aperture in hole, right rank is conical surface, and the valve seat side has the water inlet (2-4) in radially equally distributed connection scala media hole (2-1); Described spool (3) is by the tail end cylinder (3-1) of one, conical section (3-2) and head end cylinder (3-3) consist of, tail end cylinder (3-1) diameter and holes, the left rank of described valve seat (2-2) diameter are complementary, conical section (3-2) maximum radial diameter of section is greater than the diameter in holes, described right rank (2-3), the cone angle of conical section is less than the cone angle of the conical surface in right aperture, holes, the right rank of valve seat (2-3), spool has axial hole (3-4), the internal diameter of the corresponding tail end column part of axial hole increases, and damper (4) wherein is installed; Spool (3) tail end cylinder (3-1) is slidingly matched with holes, the left rank of valve seat (2-2), and the conical surface in the right aperture of conical section (3-2) and holes, the right rank of valve seat (2-3) forms the valve port of cone valve structure; Valve seat (2) is slidingly matched with body cavity, and the water inlet of valve seat (2-4) is positioned at valve body annular undercut groove (1-1) relevant position;
Described valve body (1) right-hand member sealing, spring seat (6) is embedded in the right bottom surface of body cavity, and spring (5) is placed between spool head end cylinder (3-3) and the spring seat (6) and both are spacing by rear;
Described body cavity left end is built-in with the cylindrical cushion block (7) that is slidingly matched with body cavity, cylindrical cushion block (7) seals the left side of described valve seat (2), and the valve base cavity between cylindrical cushion block (7) and the spool tail end cylinder (3-1) consists of damping cavity (8);
Left end cap (9) by screw be connected the valve body left side and connect, adjusting screw rod (10) and left end cap (9) screw-thread fit are also withstood described cylindrical cushion block (7).
2. the first differential type water hydraulic relief valve as claimed in claim 1 is characterized in that:
Described damper (4) is for having the cylindrical body of axial hole, and the aperture of axial hole is 0.6～1.6mm;
Described valve seat adopts titanium alloy, monel or Austenitic Stainless Steel to be processed into, and described spool adopts and is processed into through Martensitic Stain Less Steel or the Precipitation-hardening Stainless Steel of enhancement process.
3. the second differential type water hydraulic relief valve, comprise valve body (1), valve seat (2), spool (3), spring (5), spring seat (6) and adjusting screw rod (10), valve seat (2), spool (3), spring (5) and spring seat (6) are housed in the described valve body (1) from left to right successively; It is characterized in that:
Described valve body (1) inner chamber is circular port, circular port middle part has annular undercut groove (1-1), and valve body side diverse location has respectively the liquid entering hole (P) that is communicated with described annular undercut groove (1-1) and the liquid outlet (T) of connecting valve intracoelomic cavity; Described valve seat (2) is shaped as cylinder, outside diameter of cylinder and body cavity circular port internal diameter coupling, valve base cavity is three coaxial rank step holes, the diameter in hole, right rank (2-3) is greater than the diameter in hole, left rank (2-2), the right aperture in hole, right rank (2-3) is conical surface, and the valve seat side has the water inlet (2-4) in radially equally distributed connection scala media hole (2-1); Described spool (3) is by the tail end cylinder (3-1) of one, conical section (3-2) and head end cylinder (3-3) consist of, tail end cylinder (3-1) diameter and holes, the left rank of described valve seat (2-2) diameter are complementary, conical section (3-2) maximum radial diameter of section is greater than the diameter in holes, described right rank (2-3), the cone angle of conical section is less than the cone angle of the conical surface in right aperture, holes, the right rank of valve seat (2-3), spool has axial hole (3-4), the internal diameter of the corresponding tail end column part of axial hole increases, and damper (4) wherein is installed; Spool (3) tail end cylinder (3-1) is slidingly matched with holes, the left rank of valve seat (2-2), and the conical surface in the right aperture of conical section (3-2) and holes, the right rank of valve seat (2-3) forms the valve port of cone valve structure; Valve seat (2) is slidingly matched with body cavity, and the water inlet of valve seat (2-4) is positioned at valve body annular undercut groove (1-1) relevant position;
Right end cap (11) by screw thread be connected the body cavity right-hand member and connect, right end cap (11) left end is shaped as drum, right end cap (11) right-hand member be shaped as outer hexagonal prism body, spring seat (6) is embedded in the right end cap inner chamber and is slidingly matched with the right end cap inner chamber, and spring (5) is placed between spool head end cylinder (3-3) and the spring seat (6) and both are spacing by rear; Adjusting screw rod (10) and right end cap bottom surface screw-thread fit are also withstood described spring seat (6);
The sealing of described valve body (1) left end, the body cavity between the left side of described body cavity left end bottom surface and described valve seat (2) consists of damping cavity (8).
4. the second differential type water hydraulic relief valve as claimed in claim 3 is characterized in that:
Described damper (4) is for having the cylindrical body of axial hole, and the aperture of axial hole is 0.6～1.6mm;
Described valve seat adopts titanium alloy, monel or Austenitic Stainless Steel to be processed into, and described spool adopts and is processed into through Martensitic Stain Less Steel or the Precipitation-hardening Stainless Steel of enhancement process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210398945.4A CN102943909B (en) | 2012-10-19 | 2012-10-19 | Differential type water hydraulic relief valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210398945.4A CN102943909B (en) | 2012-10-19 | 2012-10-19 | Differential type water hydraulic relief valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102943909A true CN102943909A (en) | 2013-02-27 |
| CN102943909B CN102943909B (en) | 2014-04-09 |
Family
ID=47726878
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210398945.4A Active CN102943909B (en) | 2012-10-19 | 2012-10-19 | Differential type water hydraulic relief valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102943909B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103925409A (en) * | 2014-04-02 | 2014-07-16 | 苏州沃特节水产品有限公司 | Water tank water inlet valve |
| CN105508674A (en) * | 2016-02-24 | 2016-04-20 | 湖北仁创科技有限公司 | Slide damping type water hydraulic overflow valve for high-pressure and high-flow systems |
| CN108131345A (en) * | 2017-12-21 | 2018-06-08 | 宁波文泽机电技术开发有限公司 | A kind of high-damping direct-acting overflow valve |
| CN108167253A (en) * | 2017-12-27 | 2018-06-15 | 邵立坤 | Buffer overflow valve |
| CN108869761A (en) * | 2018-09-17 | 2018-11-23 | 东莞市奥垦汽车泵业有限公司 | A kind of mute improvement control valve of oil pump |
| CN111236998A (en) * | 2019-10-29 | 2020-06-05 | 北京天地玛珂电液控制系统有限公司 | Intrinsically safe electro-hydraulic control reversing valve for aqueous medium mine |
| CN114198563A (en) * | 2021-11-23 | 2022-03-18 | 河南航天液压气动技术有限公司 | Low-pressure large-flow direct-acting overflow valve |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2130987Y (en) * | 1992-06-30 | 1993-04-28 | 沈阳液压机厂 | Differential limit ultra-high-pressure overflow valve |
| US5447174A (en) * | 1993-08-02 | 1995-09-05 | Hydrolux S.A.R.L. | Pilot stage for pressure control valves |
| CN1619198A (en) * | 2004-04-21 | 2005-05-25 | 华中科技大学 | Leading type water pressure overflow valve |
| CN201909074U (en) * | 2010-12-10 | 2011-07-27 | 北京工业大学 | Direct-operated water pressure overflow valve with damping piston |
| CN201944356U (en) * | 2011-01-04 | 2011-08-24 | 句容市天龙机械制造厂 | Plunger type safety valve |
| JP2012137171A (en) * | 2010-12-28 | 2012-07-19 | Nachi Fujikoshi Corp | Relief valve |
| CN102678987A (en) * | 2012-05-04 | 2012-09-19 | 华中科技大学 | Seawater hydraulic overflow valve |
-
2012
- 2012-10-19 CN CN201210398945.4A patent/CN102943909B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2130987Y (en) * | 1992-06-30 | 1993-04-28 | 沈阳液压机厂 | Differential limit ultra-high-pressure overflow valve |
| US5447174A (en) * | 1993-08-02 | 1995-09-05 | Hydrolux S.A.R.L. | Pilot stage for pressure control valves |
| CN1619198A (en) * | 2004-04-21 | 2005-05-25 | 华中科技大学 | Leading type water pressure overflow valve |
| CN201909074U (en) * | 2010-12-10 | 2011-07-27 | 北京工业大学 | Direct-operated water pressure overflow valve with damping piston |
| JP2012137171A (en) * | 2010-12-28 | 2012-07-19 | Nachi Fujikoshi Corp | Relief valve |
| CN201944356U (en) * | 2011-01-04 | 2011-08-24 | 句容市天龙机械制造厂 | Plunger type safety valve |
| CN102678987A (en) * | 2012-05-04 | 2012-09-19 | 华中科技大学 | Seawater hydraulic overflow valve |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103925409A (en) * | 2014-04-02 | 2014-07-16 | 苏州沃特节水产品有限公司 | Water tank water inlet valve |
| CN103925409B (en) * | 2014-04-02 | 2016-09-07 | 苏州沃特节水产品有限公司 | A kind of tank intake valve of water |
| CN105508674A (en) * | 2016-02-24 | 2016-04-20 | 湖北仁创科技有限公司 | Slide damping type water hydraulic overflow valve for high-pressure and high-flow systems |
| CN108131345A (en) * | 2017-12-21 | 2018-06-08 | 宁波文泽机电技术开发有限公司 | A kind of high-damping direct-acting overflow valve |
| CN108131345B (en) * | 2017-12-21 | 2019-12-03 | 北京市捷瑞特弹性阻尼体技术研究中心 | A kind of high-damping direct-acting overflow valve |
| CN108167253A (en) * | 2017-12-27 | 2018-06-15 | 邵立坤 | Buffer overflow valve |
| CN108869761A (en) * | 2018-09-17 | 2018-11-23 | 东莞市奥垦汽车泵业有限公司 | A kind of mute improvement control valve of oil pump |
| CN108869761B (en) * | 2018-09-17 | 2024-03-15 | 东莞珀力伟动力科技有限公司 | Mute improved control valve of oil pump |
| CN111236998A (en) * | 2019-10-29 | 2020-06-05 | 北京天地玛珂电液控制系统有限公司 | Intrinsically safe electro-hydraulic control reversing valve for aqueous medium mine |
| CN114198563A (en) * | 2021-11-23 | 2022-03-18 | 河南航天液压气动技术有限公司 | Low-pressure large-flow direct-acting overflow valve |
| CN114198563B (en) * | 2021-11-23 | 2024-01-19 | 河南航天液压气动技术有限公司 | Low-pressure high-flow direct-acting overflow valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102943909B (en) | 2014-04-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102943909B (en) | Differential type water hydraulic relief valve | |
| CN102042432B (en) | Direct-acting water pressure overflow valve with damping piston | |
| CN104864137B (en) | Leading type water pressure overflow valve | |
| CN104019258A (en) | Double-damping direct-acting type hydraulic pressure overflowing valve | |
| CN201909074U (en) | Direct-operated water pressure overflow valve with damping piston | |
| CN204628673U (en) | Leading type water pressure overflow valve | |
| CN100485239C (en) | Middle high pressure directly-acting hydraulic overflow valve | |
| CN102678987A (en) | Seawater hydraulic overflow valve | |
| CN105351582A (en) | Movable valve seat type spring loaded type relief valve | |
| CN101000113A (en) | Middle and high pressure guiding type water pressure reducing valve | |
| US20170175908A1 (en) | Double-Piston-Effect Valve | |
| CN103851211B (en) | Pressure proportional electromagnetic valve slide valve level structure with adjustable gain | |
| CN100366967C (en) | Leading type water pressure overflow valve | |
| CN102635661B (en) | Hydraulic buffer | |
| CN103759028B (en) | A kind of flow coefficient is with the controlled pressure drilling throttle valve tubular needle of aperture linear change | |
| CN102094979B (en) | Integrated water hydraulic distributing valve | |
| CN105715621A (en) | Direct relief valve with guide structure | |
| CN103697019A (en) | Safety valve for motor of excavator | |
| CN205101618U (en) | Move straight ejector half overflow valve of disk seat formula | |
| CN207776819U (en) | A kind of helicoid hydraulic motor with voltage-limiting protection function | |
| CN203082219U (en) | Depressurization regulating valve for liquid oxygen pump backflow | |
| CN112268140B (en) | Cavitation inhibition type hydraulic valve | |
| CN203879832U (en) | Pure water hydraulic throttle valve | |
| CN201531476U (en) | Magnetorheological fluid pilot operated type relief valve | |
| CN104373638A (en) | Straight-through type hydraulic pressure one-way valve |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170420 Address after: 430205 Hubei city of Wuhan province Hongshan three village, Wuchang huakeda steam school practice of science and technology development center first floor Patentee after: WUHAN JUWEITIAN DIGITAL MACHINERY MANUFACTURING CO., LTD. Address before: 430074 Hubei Province, Wuhan city Hongshan District Luoyu Road No. 1037 Patentee before: Huazhong University of Science and Technology |