CN1304761C - Pilot type pure water overflow valve - Google Patents
Pilot type pure water overflow valve Download PDFInfo
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- CN1304761C CN1304761C CNB2004100535559A CN200410053555A CN1304761C CN 1304761 C CN1304761 C CN 1304761C CN B2004100535559 A CNB2004100535559 A CN B2004100535559A CN 200410053555 A CN200410053555 A CN 200410053555A CN 1304761 C CN1304761 C CN 1304761C
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 239000007788 liquid Substances 0.000 claims abstract description 49
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- POIUWJQBRNEFGX-XAMSXPGMSA-N cathelicidin Chemical compound C([C@@H](C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CO)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H]([C@@H](C)CC)C(=O)NCC(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H](CC=1C=CC=CC=1)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](C(C)C)C(=O)N[C@@H](CCC(N)=O)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CC(O)=O)C(=O)N[C@@H](CC=1C=CC=CC=1)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](C(C)C)C(=O)N1[C@@H](CCC1)C(=O)N[C@@H](CCCNC(N)=N)C(=O)N[C@@H]([C@@H](C)O)C(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H](CO)C(O)=O)NC(=O)[C@H](CC=1C=CC=CC=1)NC(=O)[C@H](CC(O)=O)NC(=O)CNC(=O)[C@H](CC(C)C)NC(=O)[C@@H](N)CC(C)C)C1=CC=CC=C1 POIUWJQBRNEFGX-XAMSXPGMSA-N 0.000 description 4
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- 238000005260 corrosion Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
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- 230000009972 noncorrosive effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
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Abstract
The present invention discloses a pilot type pure water overflow valve. A main valve sleeve is arranged in a main valve, and a main valve core is positioned in the main valve sleeve, and is compressed by a spring. The lower end of a main valve body is provided with a water inlet and a water outlet communicated through the inflow channel of the main valve in the valve body. The main valve core is in a secondary throttling conical valve structure with high pressure diversion holes, and utilizes high pressure diversion bundles to influence main flow bundles so as to effectively suppress cavitation erosion and reduce noise and vibration. A fixed liquid resistance is arranged in the main valve core so as to increase the working stability of the overflow valve. A pilot valve core is in a conical valve structure with a damping piston, which increases motion damping so as to increase the working stability of the overflow valve and make the pilot valve core has the function of guide without decline after being turned on. The fixed liquid resistance is arranged in precursory inlet so as to increase the constant voltage precision of the overflow valve. The present invention has zero leakage through the seal between the valve core and the valve sleeve, and the valve sleeve and the valve body, and the conical valve structure with a shaped flow path, improves the dynamic and static performance of the overflow valve by the addition of a damper at a valve port, and has good universality.
Description
Technical field
The present invention relates to the hydraulic control technology is the hydraulic element of feature, relates in particular to a kind of pilot-operated water hydraulic relief valve.
Background technique
The pure water hydraulics technology has the unique advantage of the feature of environmental protection and flame retarding because of it, just be subjected to the extensive attention of countries in the world hydraulic pressure circle, and water hydraulic components also becomes one of key content of research.Relief valve is one of the most key valve element of hydraulic system, also becomes research emphasis at the research of the relief valve that is applicable to the pure water hydraulics system.
Traditional oil pressure relief valve has two kinds of patterns: a kind of direct acting type relief valve of forming by valve body, taper or spherical valve core and pressure adjusting spring, also claim direct-acting overflow valve, and its pressure controling precision is low, often does pilot valve and uses; Another kind is by pilot valve and two-stage or three grades of pilot operated compound relief valves that concentric main valve is formed, and this valve allows pressure to be carried out minor adjustments, the pressure controling precision height.But, because the spool of pilot valve is taper or sphere, no matter be direct-acting type or leading type, because the variable restrictor valve port of its pilot valve has only one, and opening degree is very little, the flow gain height, and noise is big, thereby limited its working pressure can not be too high, valve easily breaks, the life-span is short.In the pure water hydraulics system, because the density of water is big, viscosity is little, the working stability problem of water hydraulic relief valve is even more serious than oil pressure relief valve, simultaneously, the leakage rate of water hydraulic relief valve is tens of times of oil pressure relief valve under the same conditions, makes the structure of existing oil pressure relief valve can't be applicable to aqueous medium.
In addition, because the pressure for vaporization height of water make water electrode easily vaporize and boiling, thereby under the same conditions, the cavitation erosion degree that water hydraulic relief valve suffers is than the strong hundreds of times of oil pressure relief valve; Compare with mineral oil, aqueous medium corrosivity is very strong, and the destruction of corrosive action makes prior oil pressure relief valve material all not be suitable for aqueous medium.
Therefore, how to draw the design experiences of traditional oils pressurized overflow valve, overcome the adverse effect that aqueous medium brings, improve the quiet dynamic characteristic of relief valve, become the key point of water hydraulic relief valve research.The water hydraulic relief valve structure of development has mainly still been continued to use traditional oil pressure structure of relief valve in the world at present, it has only a fixer resistance in the guide loop, between poppet valve core and valve seat, form variable liquid resistance, when spillway discharge increases, pilot valve and main valve aperture all will increase, flow increases, and inlet pressure increases, and therefore has bigger positive stable state override pressure.And its anti-cavitation erosion ability is relatively poor, and to having relatively high expectations of processing technology, processing cost is higher.
Summary of the invention
The object of the present invention is to provide a kind of pilot-operated water hydraulic relief valve, be used to improve the quiet dynamic characteristic of relief valve, realize not having and leak, alleviate phenomenons such as cavitation erosion, corrosion simultaneously, be higher than in being applicable under the aqueous medium environment.
The technical solution adopted for the present invention to solve the technical problems is: this pilot-operated water hydraulic relief valve is combined by main valve and pilot valve arranged coaxial; Wherein:
1) main valve: comprise main valve body, main valve housing is contained in the main valve body opening, main valve plug is contained in the main valve housing, the resistance of main valve liquid is housed in the main valve plug small through hole, in the main valve plug large through-hole main spool spring is housed, when main valve plug is opened, form the variable restrictor valve port of two polyphones between main valve plug and the main valve housing, have water intake and water outlet on the main valve body, the liquid flow point of water intake is a two-way, lead up to the main valve plug center hole, main valve liquid resistance is communicated with the main spool spring chamber, and another road is communicated with water outlet by the runner that forms between main valve plug and the main valve housing, has radial direction through hole in the main valve plug center hole;
2) pilot valve: comprise guide's valve body, have six stepped hole in guide's valve body from left to right successively, guide's valve body from left to right first, two, guide's valve pocket is housed in three holes, guide's spool is contained in the pilot valve trepanning, the resistance of pilot valve liquid is housed in the 4th hole, the other end of main valve housing matches with the 6th hole in guide's valve body, the other end of main spool spring withstands on the 5th hole end surface in guide's valve body, in first hole of guide's valve body the pilot valve end cap is housed, in the pilot valve end cap adjustable lever is housed, the pilot valve spring withstands between guide's spool and the adjustable lever, the liquid stream in main spool spring chamber is through the 6th hole of guide's valve body, the 5th hole, the resistance of pilot valve liquid enters the 3rd hole, the radial direction through hole that puts through pilot valve enters pilot valve and puts center hole then, when guide valve core is opened in the ban, form a variable restrictor valve port between guide's spool and the guide's valve pocket, the liquid stream that pilot valve puts in the center hole flows in guide's valve body first hole through variable restrictor valve port and guide's valve pocket radial direction through hole, the inclined hole that liquid stream in the pilot valve spring chamber puts by pilot valve flows in guide's valve body first hole, and liquid stream is communicated with the main valve water outlet by the runner on guide's valve body in guide's valve body first hole.
With the sealing of first O-ring seals, respectively with second O-ring seals and the sealing of the 3rd O-ring seals, seal with the 4th O-ring seals between the 6th hole of main valve housing and guide's valve body between main valve housing and the main valve body between main valve plug and the main valve housing; Seal with the 5th O-ring seals between guide's valve pocket and the guide's valve body; With the sealing of the 6th O-ring seals, seal with the 7th O-ring seals between adjustable lever and the pilot valve end cap between pilot valve end cap and the guide's valve body.
Main valve plug is the two-step throttle structure that has effective inhibition cavitation erosion, reduces noise, reduces to vibrate, and have at the main valve plug center and can influence the high-pressure induct of main flow bundle radial direction through hole, set up the pilot valve liquid resistance that can improve the relief valve setting-pressure accuracy in the pilot valve ingress, resistance of main valve liquid and pilot valve liquid resistance polyphone, guide's spool is for increasing kinetic damping, improve the relief valve working stability, make guide's spool guiding, three grades of cone valve structures of the band damping piston that can not tilt after guaranteeing to open.
The present invention compares with background technique, and the beneficial effect that has is:
1, main valve plug is the variable restrictor valve port that forms two polyphones between two-step throttle structure and the main valve housing, the pressure drop of relief valve in main valve carried on a shoulder pole by two variable throttle valve mouthpieces, thereby improved the relief valve working pressure, so, for reaching same pressure regulation requirement, need by same flow, opening degree must increase, because opening degree increases, flow gain reduces, thereby has improved relief valve stability; In addition, have the high-pressure induct hole at the center, utilize the high-pressure induct bundle to influence the main flow bundle, can effectively suppress cavitation erosion, reduce noise, reduce vibration;
2, set up the liquid resistance in the pilot valve ingress, make and not only can improve resistance of main valve liquid and first drain resistance polyphone the relief valve setting-pressure accuracy, and can avoid elongated hole liquid capacitance-resistance to be prone to blocking problem; Guide's spool is the cone valve structure of band damping piston, thereby this piston can not only increase the working stability that kinetic damping improves relief valve, can also make guide's spool guiding, can not tilt after guaranteeing to open;
3, between main valve plug and the main valve housing, between main valve housing and the main valve body, between main valve housing and the guide's valve body, between guide's valve pocket and the guide's valve body, between pilot valve end cap and the guide's valve body, all directly seal between adjustable lever and the pilot valve end cap, efficiently solve water hydraulic relief valve and leak serious problem with O-ring seals;
4, the main valve inner flow passage of particular design and valve pocket structure help alleviating the harm that cavitation erosion brings.For preventing cavitation erosion, utilize flow field simulation that the main valve inner flow passage has been carried out optimal design, can make current smooth more, alleviated cavitation erosion and flow noise, all elements of valve are equal to adopt anti-corrosion non-corrosive material, can guarantee that valve has the long life-span;
5, simple structure of the present invention, flexible movements are reliable, and it is good to have versatility, is easy to standardized characteristics, is applicable to the mesohigh operating conditions.
Description of drawings
Fig. 1 is a structural principle schematic representation of the present invention.
Fig. 1: the 1st, main valve body, the 2nd, main valve housing, the 3rd, O-ring seals, the 4th, the resistance of main valve liquid, the 5th, main valve plug, the 6th, O-ring seals, the 7th, back-up ring, the 8th, O-ring seals, the 9th, back-up ring, the 10th, O-ring seals, the 11st, main spool spring, the 12nd, the resistance of pilot valve liquid, the 13rd, guide's valve body, the 14th, O-ring seals, the 15th, back-up ring, the 16th, guide's valve pocket, the 17th, guide's spool, the 18th, pilot valve end cap, the 19th, pilot valve spring, the 20th, spring pad, the 21st, pad, the 22nd, adjustable lever, the 23rd, nut, the 24th, back-up ring, the 25th, O-ring seals, the 26th, nut, the 27th, back-up ring, the 28th, O-ring seals, the 29th, steel is stifled, and the 30th, O-ring seals, the 31st, O-ring seals, the P mouth is a water intake, and the O mouth is a water outlet, and A is a main valve, B is a pilot valve, and a is a runner, and b is a radial direction through hole, c is a center hole, and f is a center hole, and g is a runner, i is an inclined hole, and m is a radial direction through hole, and n is a radial direction through hole.
Embodiment
Pilot-operated water hydraulic relief valve is combined by main valve A and pilot valve B, in main valve body 1 hole, main valve housing 2 is housed, taper main valve plug 5 with two-step throttle and high-pressure induct structure is positioned at main valve housing 2 holes, and compress by spring 11, when main valve plug 5 is opened, form the variable restrictor valve port of two polyphones between main valve plug 5 and the main valve housing 2, main valve body 1 lower end has water intake P and water outlet O, liquid flow point by water intake P is a two-way, lead up to main valve plug center hole c, main valve liquid resistance 4 is communicated with the main spool spring chamber, another road is communicated with water outlet O by the runner a of formation between main valve plug 5 and the main valve housing 2, has radial direction through hole b in main valve plug 5 center hole c; Set up pilot valve liquid resistance 12 in pilot valve B ingress, make and not only can improve resistance 4 of main valve liquid and pilot valve liquid resistance 12 polyphones the relief valve setting-pressure accuracy, and can avoid elongated hole liquid capacitance-resistance to be prone to blocking problem;
Have six stepped hole in guide's valve body 13 from left to right successively, guide's valve body 13 from left to right first, two, guide's valve pocket 16 is housed in three holes, guide's spool 17 with damping piston is arranged in guide's valve pocket 16 holes, thereby this piston can not only increase the working stability that kinetic damping improves relief valve, can also make guide's spool 17 guiding, can not tilt after guaranteeing to open, liquid resistance 12 is housed in the 4th hole, the other end of main valve housing 2 matches with the 6th hole in guide's valve body 13, the other end of main spool spring 11 withstands on the 5th hole end surface in guide's valve body 13, in first hole of guide's valve body 13 pilot valve end cap 18 is housed, adjustable lever 22 is housed in the pilot valve end cap 18, pilot valve spring 19 withstands between guide's spool 17 and the adjustable lever 22, the liquid stream in main spool spring chamber is through the 6th hole of guide's valve body 1, the 5th hole, elder generation's drain resistance 12 enters the 3rd hole, enter pilot valve through the radial direction through hole m on guide's valve pocket 16 then and put center hole f, when guide valve core 17 is opened in the ban, form a variable restrictor valve port between guide's spool 17 and the guide's valve pocket 16, the liquid stream that pilot valve puts in the center hole f flows in guide's valve body first hole through variable restrictor valve port and guide's valve pocket radial direction through hole n, liquid stream in the pilot valve spring chamber flows in guide's valve body first hole by the inclined hole i on guide's valve pocket 16, and liquid stream is communicated with main valve water outlet O by the runner g on guide's valve body in guide's valve body first hole; Pilot valve spring 19 is used to set up relief valve pressure, and main spool spring 11 is used for main valve plug 5 is pressed against main valve housing 2, makes primary valve close; When the pressure of main intake valve P reaches the relief valve set pressure, press water enters guide's valve pocket by main valve plug center hole, main valve liquid resistance 4, main spool spring chamber, first drain resistance 12, overcome the spring force of pilot valve spring 19, make guide's spool 17 open, the relief valve overflow, liquid stream forms pressure reduction at the main valve plug two ends simultaneously, and main valve plug 5 is opened, and liquid stream arrives main valve water outlet O through the shaped flow channel that forms between main valve plug 5 and the main valve housing 2.
Seal with O-ring seals 8, back-up ring 9 between main valve plug 5 and the main valve housing 2, respectively with O-ring seals 3, back-up ring and O-ring seals 6, back-up ring 7 sealings, use O-ring seals 10, retaining ring sealing between the 6th hole of main valve housing 2 and guide's valve body 13 between main valve housing 2 and the main valve body 1; Seal with O-ring seals 14, back-up ring 15 between guide's valve pocket 16 and the guide's valve body 13; With O-ring seals 28, back-up ring 27 sealings, seal with O-ring seals 25, back-up ring 24 between adjustable lever 22 and the pilot valve end cap 18 between pilot valve end cap 18 and the guide's valve body 13.
The rated working pressure of this valve is 14MPa (maximum service pressure is 21MPa), and rated flow is 120L/min.
Employing have two-step throttle and high-pressure induct structure the taper main valve plug, have the pilot poppet valve core of damping piston, set up the liquid resistance in the pilot valve ingress, make resistance of main valve liquid and first drain resistance polyphone improve the relief valve setting-pressure accuracy, the non-corrosive material of seal form and special processing combination reliably is the characteristics of this valve.This valve adopts socket head screw to connect main valve body 1 and guide's valve body 13, and main valve plug 5 is contained in the main valve body 1, and main valve housing 2 is contained in main valve body 1 center, and main spool spring 11 is pressed against main valve plug 5 on the main valve housing 2.Main valve body 1 lower end has water intake P and water outlet O, and both are interconnected by main valve plug 5 and the shaped flow channel that main valve housing 2 forms, and intake-outlet adopts board-like connection, and O-ring seals 31 is sealed into water outlet when being used for board-like connection.Add back-up ring 9 sealings by O-ring seals 8 between main valve plug 5 and the main valve housing 2, the form that this employing Sealing directly seals is good in high pressure water ambient condition lower seal performance.Form the variable restrictor valve port of two polyphones between main valve plug 5 and the main valve housing 2, make valve port pressure reduction bear jointly by two restrictions, shaped flow channel between main valve plug 5 and the main valve housing 2 is optimized design, make current smooth more, can reduce the possibility that cavitation erosion takes place greatly, have the high-pressure induct hole at main valve plug 5 centers, utilize the high-pressure induct bundle to influence the main flow bundle, can effectively suppress cavitation erosion, reduce noise, reduce vibration.The pilot-operated water hydraulic relief valve of being developed relies on guide's spring 19 to carry out pressure regulation, turn nut 23 is undertaken spacing by nut 26,22 motions of nut 23 compressing adjustable levers, adjustable lever 22 links to each other with spring pad 20, pad 21 and compresses guide's spring 19, regulating system pressure change.Pilot valve B ingress is provided with first drain resistance 12, liquid stream arrives the pilot valve outlet by first drain resistance 12, guide's spool 17 with the variable restrictor valve port that guide's valve pocket 16 forms, seal with O-ring seals 30 in the pilot valve outlet port, the pilot valve outlet communicates with the main valve outlet, belong to the internal control internal drainage type, drain port outside having on pilot valve B is generally used plug 29 shutoff.
Claims (3)
1, a kind of pilot-operated water hydraulic relief valve is characterized in that: this pilot-operated water hydraulic relief valve is combined by main valve (A) and pilot valve (B) arranged coaxial; Wherein:
1) main valve (A): comprise main valve body (1), main valve housing (2) is contained in main valve body (1) hole, main valve plug (5) is contained in the main valve housing (2), main valve liquid resistance (4) is housed in main valve plug (5) small through hole, in main valve plug (5) large through-hole main spool spring (11) is housed, when main valve plug (5) is opened, form the variable restrictor valve port of two polyphones between main valve plug (5) and the main valve housing (2), have water intake (P) and water outlet (O) on the main valve body (1), the liquid flow point of water intake (P) is a two-way, lead up to main valve plug center hole (c), main valve liquid resistance (4) is communicated with the main spool spring chamber, another road is communicated with water outlet (O) by the runner (a) of formation between main valve plug (5) and the main valve housing (2), has radial direction through hole (b) in main valve plug (5) center hole (c);
2) pilot valve (B): comprise guide's valve body (13), have six stepped hole in guide's valve body (13) from left to right successively, guide's valve body (13) from left to right first, two, guide's valve pocket (16) is housed in three holes, guide's spool (17) is contained in guide's valve pocket (16) hole, pilot valve liquid resistance (12) is housed in the 4th hole, the other end of main valve housing (2) matches with the 6th hole in guide's valve body (13), the other end of main spool spring (11) withstands on the 5th hole end surface in guide's valve body (13), pilot valve end cap (18) is housed in first hole of guide's valve body (13), adjustable lever (22) is housed in the pilot valve end cap (18), pilot valve spring (19) withstands between guide's spool (17) and the adjustable lever (22), the liquid stream in main spool spring chamber is through the 6th hole of guide's valve body (1), the 5th hole, pilot valve liquid resistance (12) enters the 3rd hole, the radial direction through hole (m) that passes through then on guide's valve pocket (16) enters upward center hole (f) of guide's valve pocket (16), when guide valve core (17) is opened in the ban, form a variable restrictor valve port between guide's spool (17) and the guide's valve pocket (16), the liquid stream that guide's valve pocket (16) is gone up in the center hole (f) flows in guide's valve body first hole through variable restrictor valve port and guide's valve pocket (16) radial direction through hole (n), liquid stream in the pilot valve spring chamber flows in guide's valve body first hole by the inclined hole (i) on guide's valve pocket (16), and liquid stream is communicated with main valve water outlet (O) by the runner (g) on guide's valve body in guide's valve body (13) first holes.
2, a kind of pilot-operated water hydraulic relief valve according to claim 1, it is characterized in that main valve plug (5) is the two-step throttle structure, and have at main valve plug (5) center and can influence the high-pressure induct of main flow bundle radial direction through hole (b), set up pilot valve liquid resistance (12) in pilot valve (B) ingress, main valve liquid resistance (4) is three grades of cone valve structures of band damping piston with pilot valve liquid resistance (12) polyphone, guide's spool (17).
3, a kind of pilot-operated water hydraulic relief valve according to claim 1, it is characterized in that: seal with first O-ring seals (8) between main valve plug (5) and the main valve housing (2), use the sealing of second O-ring seals (3) and the 3rd O-ring seals (6) between main valve housing (2) and the main valve body (1) respectively, seal with the 4th O-ring seals (10) between the 6th hole of main valve housing (2) and guide's valve body (13); Seal with the 5th O-ring seals (14) between guide's valve pocket (16) and the guide's valve body (13); With the 6th O-ring seals (28) sealing, seal with the 7th O-ring seals (25) between adjustable lever (22) and the pilot valve end cap (18) between pilot valve end cap (18) and the guide's valve body (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100535559A CN1304761C (en) | 2004-08-04 | 2004-08-04 | Pilot type pure water overflow valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100535559A CN1304761C (en) | 2004-08-04 | 2004-08-04 | Pilot type pure water overflow valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1587719A CN1587719A (en) | 2005-03-02 |
| CN1304761C true CN1304761C (en) | 2007-03-14 |
Family
ID=34602914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100535559A Expired - Fee Related CN1304761C (en) | 2004-08-04 | 2004-08-04 | Pilot type pure water overflow valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1304761C (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100439895C (en) * | 2006-01-19 | 2008-12-03 | 浙江大学 | Oil elastic modulus detector based on volume elastic modulus definition |
| CN102042432B (en) * | 2010-12-10 | 2012-05-23 | 北京工业大学 | Direct-acting water pressure overflow valve with damping piston |
| CN105805073B (en) * | 2016-05-29 | 2017-08-25 | 浙江大学 | A kind of plug-in overflow valve main valve that there is orientation to damp |
| CN107489799B (en) * | 2017-08-31 | 2023-11-03 | 上海立新液压有限公司 | Efficient guide overflow valve |
| CN111765005B (en) * | 2020-06-10 | 2021-09-28 | 中国航发北京航科发动机控制***科技有限公司 | Hydraulic stability adjusting device composed of piston damping and variable throttling nozzle |
| CN112032377B (en) * | 2020-08-21 | 2021-09-14 | 浙江大学 | Quick-response pilot operated safety valve and system overpressure quick protection method |
| CN114183425B (en) * | 2021-11-30 | 2023-02-14 | 华中科技大学 | Damping element matched with adjustable gap, direct-acting overflow valve and pilot-operated overflow valve |
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| US5437306A (en) * | 1993-11-30 | 1995-08-01 | Smc Corporation | Double-solenoid type electromagnetic valve |
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| CN1270663A (en) * | 1997-09-10 | 2000-10-18 | 伯恩特·洛伦茨 | Overflow valve |
| US6554014B2 (en) * | 2000-10-13 | 2003-04-29 | Hydraforce, Inc. | Proportional pilot operated directional valve |
| CN2729386Y (en) * | 2004-08-04 | 2005-09-28 | 浙江大学 | Guide water hydraulic relief valve |
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2004
- 2004-08-04 CN CNB2004100535559A patent/CN1304761C/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85109329A (en) * | 1985-12-26 | 1987-08-12 | 庄凤龄 | Pilot operated compound relief valve |
| CN86201695U (en) * | 1986-03-25 | 1987-05-06 | 陕西机械学院 | Piston type lead overflow valve |
| US5437306A (en) * | 1993-11-30 | 1995-08-01 | Smc Corporation | Double-solenoid type electromagnetic valve |
| US5623967A (en) * | 1994-09-13 | 1997-04-29 | Smc Corporation | Pilot switch valve |
| CN1270663A (en) * | 1997-09-10 | 2000-10-18 | 伯恩特·洛伦茨 | Overflow valve |
| US6554014B2 (en) * | 2000-10-13 | 2003-04-29 | Hydraforce, Inc. | Proportional pilot operated directional valve |
| CN2729386Y (en) * | 2004-08-04 | 2005-09-28 | 浙江大学 | Guide water hydraulic relief valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1587719A (en) | 2005-03-02 |
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