CN100366967C - Leading type water pressure overflow valve - Google Patents
Leading type water pressure overflow valve Download PDFInfo
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- CN100366967C CN100366967C CNB2004100130707A CN200410013070A CN100366967C CN 100366967 C CN100366967 C CN 100366967C CN B2004100130707 A CNB2004100130707 A CN B2004100130707A CN 200410013070 A CN200410013070 A CN 200410013070A CN 100366967 C CN100366967 C CN 100366967C
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Abstract
The present invention relates to a pilot type water pressure overflow valve which belongs to the class of valves. The purposes of the pilot type water pressure overflow valve are to reduce the working pressure difference of a main valve port, widen the pressure regulating range, reduce the lateral oscillation of a pilot valve, increase the damping of the pilot valve, and realize cavitation resistance and low noise. A main valve body of the pilot type water pressure overflow valve is provided with a front end cover, and a main valve seat, a main valve sleeve, a main valve core and a main valve spring are arranged in the main valve body. The pilot valve is composed of a valve seat for the pilot valve, a valve core for the pilot valve and a pressure regulating spring. The pilot valve is connected with a main valve, and the valve core for the pilot valve is provided with a guide cylindrical surface; a damping chamber is formed between the guide cylindrical surface and an inner hole of a valve body for the pilot valve. An inlet of the main valve body is provided with a throttling ring, and the throttling ring is provided with orifices with different diameters in a radial direction. A pressure grade regulating turn knob is arranged on a front end cover, and the pressure grade regulating turn knob can rotate the throttling ring to regulate the working position of the orifices, or orifices are arranged on a front end cover. The present invention which is suitable for being used as a pressure control valve in a water hydraulic system taking seawater, freshwater and high water bases as working media has the advantages of high working pressure, wide regulating range, good cavitation resistance, low noise, good working stability, etc.
Description
Technical field
The invention belongs to the valve class, be specifically related to a kind of pilot operated compound relief valve, be applicable in water and the aqueous medium hydraulic system as pressure control valve.
Background technique
Water hydraulic relief valve is a pressure control valve commonly used in water (water base) the medium Hydraulic Power Transmission System, can be used as the level pressure relief valve of setting up system works pressure or the safety valve that system is played the safety protection effect.Because media such as seawater, fresh water or height are water base have the high characteristic of pressure for vaporization, when water hydraulic relief valve was worked under higher pressure, the flow velocity at valve port place was very high, and the local compression in valve port flow field can be lower than the pressure for vaporization of water, produce a large amount of bubbles after the water vapor, Here it is cavitation.When bubble motion after pressure recovery region, bubble is externally crumbled and fall under the pressure effect, this process not only produces very big noise, and produces bigger shock and vibration.The side direction runout of pilot valve core and job insecurity also are the main causes that causes relief valve high frequency whistler in addition.
Fig. 5 is a kind of structure of typical leading type oil pressure relief valve.Its primary valve is the single-stage throttle orifice, when working under aqueous medium and High Pressure Difference serious cavitation erosion will take place.Pilot valve is equivalent to quality one spring one damping structure, is vibration, the noise that reduces relief valve, improves the working stability of pilot valve, and the measure of often taking in the oil pressure relief valve has: 1) reduce the cone valve semi-cone angle; 2) at pilot valve damping hole is set; 3) the pilot valve ante-chamber adds the weakening pad and changes this cavity volume velocity field and distribute, or adopts the miniature absorbing principle of weakening plug to eliminate to scream and vibrate; 4) add guide piston at the pilot valve front end, overcome the beat of poppet valve core.In above-mentioned measure, scheme 1)～scheme 2) adopt usually when being design, but can not tackle the problem at its root for water hydraulic relief valve.Scheme 3) lacks enough foundations in theory, facts have proved that this method is also unreliable.Scheme 4) active area of pilot valve is increased, make pressure adjusting spring rigidity bigger, can reduce the performance of relief valve.In addition, the two ends of main valve plug and main valve housing fitting surface are respectively hyperbaric chamber and low-pressure cavity among Fig. 5, seal by fitting surface, when adopting aqueous medium, not only leak greatly, and the high speed water at place, slit fails to be convened for lack of a quorum and fitting surface is produced serious wire drawing corrodes.
Fig. 6 is that (accurate Suzuki reason, Suzuki valiant fighter adds rattan Righteousness good fortune etc. for a kind of pressure guiding type water structure of relief valve of Kanagawa, Japan university development.Hydraulic pressure リ リ one Off Bian Kai development.The 74th phase common Zong Hui Talk Yan Hui Talk of this Machine of Ri tool association drills Theory collected works (III), 1997:258～259).The primary valve of this valve has adopted flat two-stage throttle structure, and the cavitation erosion of valve port is had inhibitory action.On the main valve plug guide surface, increased sealing, can reduce to leak and the wire drawing erosion.But the structure of its pilot valve is identical with the oil pressure relief valve, and therefore, the side direction runout of pilot valve, noise and working stability problem do not obtain fine solution.
Summary of the invention
The invention provides a kind of pressure guiding type water relief valve, be intended to reduce the primary valve operating pressure differential, widen range of regulation, reduce pilot valve side direction runout, increase the pilot valve damping, realize anti-cavitation erosion low noise.
A kind of pressure guiding type water relief valve of the present invention, comprise main valve and pilot valve, the main valve body of main valve [17] front end is front cover [2] fixedly, main valve body has entrance and exit on [17], be provided with main valve seat [4], main valve housing [6], main valve plug [5] in the main valve body, main valve plug [5] end has main damping valve hole [15], rear-mounted installation main spool spring [12]; Pilot valve is made of pilot valve valve seat [7], pilot valve core [8], pressure adjusting spring [9], has pilot valve damping hole [11] on the pilot valve valve seat [7], it is characterized in that:
(1) described main valve is a cone valve structure, and pilot valve is fixed on the main valve body [17], and pilot valve core has the guide cylinder face on [8], forms matching gap between the endoporus of itself and pilot valve body, makes the pressure adjusting spring chamber become damping cavity [18];
(2) ingress of main valve body [17] before the main valve seat, restrictor ring [3] is set, it radially has the different throttle orifice of a plurality of diameters, front cover [2] is gone up installing pressure retaining adjusting knob [1], the latter and the working position of the chimeric and rotatable restrictor ring of restrictor ring [3] with the adjusting throttle orifice.
Described pressure guiding type water relief valve, pilot valve can be cone valve or ball-valve structure; The main valve plug surface can have the ring-type arc groove, and is provided with rubber and plastic combination seal [14].
The another kind of pressure guiding type water relief valve of the present invention, comprise main valve and pilot valve, the main valve body of main valve [17] front end is front cover [2] fixedly, main valve body has entrance and exit on [17], be provided with main valve seat [4], main valve housing [6], main valve plug [5] in the main valve body, main valve plug [5] end has main damping valve hole [15], rear-mounted installation main spool spring [12]; Pilot valve is made of pilot valve valve seat [7], pilot valve core [8], pressure adjusting spring [9], has pilot valve damping hole [11] on the pilot valve valve seat [7], it is characterized in that:
(1) described main valve is a cone valve structure, and pilot valve is fixed on the main valve body [17], and pilot valve core has the guide cylinder face on [8], forms matching gap between the endoporus of itself and pilot valve body, makes the pressure adjusting spring chamber become damping cavity [18];
(2) ingress of main valve body [17] before front cover [2] is gone up main valve seat is provided with throttle orifice.
Described pressure guiding type water relief valve is characterized in that: pilot valve is cone valve or ball-valve structure; The main valve plug surface has the ring-type arc groove, and is provided with rubber and plastic combination seal [14].
When using this relief valve, elder generation is according to the position of its working pressure size adjustment pressure shelves adjusting knob, to set the throttle orifice diameter.When high pressure water when inlet enters relief valve, throttling action by throttle orifice reduces pressure, this pressure acts on the pilot valve, if can overcome the pilot valve spring force, then pilot valve is opened overflow, make two ends, main damping valve hole produce pressure difference, when the differential pressure action power on the main valve plug can overcome the spring force of main valve plug and frictional force, main valve is opened and is in state of equilibrium in a certain working position, make primary valve (or relief valve inlet) pressure stability, the big I of its force value changes by the pre compressed magnitude of regulating pressure adjusting spring 9.Being provided with of pilot valve damping hole 11 is beneficial to the working stability that improves main valve plug and pilot valve core.Pilot valve is in the dynamic adjustments process, and when the pilot valve spool moved right, pressure adjusting spring chamber (being damping cavity) volume reduced, and pressure raises; Otherwise then pressure reduces.Therefore, damping cavity produces an additional forces opposite with pilot valve core moving direction, thereby increases the kinetic damping of pilot valve core, improves its working stability.On main valve body, have through-flow groove 13, make the pilot valve rate of discharge be discharged to outlet through through-flow groove.
The present invention is provided with restrictor ring or throttle orifice in the relief valve ingress, has the throttle orifice of one or more different-diameters on the restrictor ring, utilizes certain throttle orifice to produce pressure difference, and with the operating pressure differential of reduction primary valve, thereby the air pockets that suppresses primary valve is lost.Simultaneously, select the throttle orifice diameter, then only just can make relief valve that the range of regulation (common relief valve then need be equipped with many springs) of broad is arranged with a pressure adjusting spring by pressure retaining adjusting knob.Set guide cylinder face on the pilot valve core, and form matching gap between the pilot valve body endoporus, make the pressure adjusting spring chamber become damping cavity, not only reduced the side direction runout of pilot valve core, and increased the kinetic damping of pilot valve core, improved the working stability of pilot valve
In addition, on main valve plug, have the ring-type arc groove, can reduce to cavitate to the damage of main valve plug and reduce Cavitation Noise.Be provided with little, the anti abrasive rubber and plastic combined seal ring of friction factor on the main valve plug guide surface, the leakage and the wire drawing that can reduce the main valve guide surface are corroded.
This relief valve be applicable to seawater, fresh water, high water base etc. as in the water hydraulic system of working medium as pressure controlled valve, have the working pressure height, advantages such as range of regulation is wide, cavitation resistive property good, noise is low, good operating stability.
Description of drawings
Fig. 1 is a kind of example structure schematic representation of the present invention.
Fig. 2 represents that pilot valve is a kind of enforcement state of ball-valve structure.
Fig. 3 is second kind of embodiment's schematic representation of the present invention.
Fig. 4 is the third embodiment's schematic representation of the present invention.
Fig. 5 is a kind of typical oil pressure pilot operated compound relief valve structural drawing.
Fig. 6 is the pressure guiding type water structure of relief valve figure of Kanagawa, Japan university development.
Be designated among the above-mentioned figure: pressure retaining adjusting knob 1, front cover 2, restrictor ring 3, main valve seat 4, main valve plug 5, main valve housing 6, pilot valve valve seat 7, pilot valve core 8, pressure adjusting spring 9, pilot valve body 10, pilot valve damping hole 11, main damping valve hole 15, main spool spring 12, through-flow groove 13, rubber and plastic combination seal 14, main damping valve hole 15, throttle orifice 16, main valve body 17, damping cavity 18, plug screw 19.
Embodiment
Shown in Figure 1, a kind of embodiment of the present invention comprises: pressure retaining adjusting knob 1, front cover 2, restrictor ring 3, throttle orifice 16, main valve body 17, main valve seat 4, main valve plug 5, rubber and plastic combination seal 14, main damping valve hole 15, main valve housing 6, main spool spring 12, pilot valve valve seat 7, pilot valve damping hole 11, pilot valve core 8, pressure adjusting spring 9, pilot valve body 10.Pilot valve and main valve be fixed on by pilot valve body 10 coaxially on the main valve body 17 be connected, pilot valve valve seat 7 pushes down main spool spring 12, main valve is a cone valve structure, pilot valve can adopt cone valve or ball-valve structure.
Fig. 2 represents that pilot valve is a kind of enforcement state of ball-valve structure.
Fig. 3 represents another kind of embodiment of the present invention, when having only a throttle orifice on the restrictor ring, then need not restrictor ring, this moment pressure guiding type water relief valve of the present invention, described main valve is a cone valve structure, pilot valve and main valve be fixed on by pilot valve body 10 coaxially on the main valve body 17 be connected, pilot valve valve seat 7 pushes down main spool spring 12, has the guide cylinder face on the pilot valve core 8, form matching gap between the endoporus of itself and pilot valve body 10, make the pressure adjusting spring chamber become damping cavity 18; The ingress of main valve body 17 before the main valve seat is provided with throttle orifice 16 on the front cover 2.
Described pressure guiding type water relief valve, pilot valve can be cone valve or ball-valve structure; The main valve plug surface can have the ring-type arc groove, and is provided with rubber and plastic combination seal 14.
Fig. 4 is the third embodiment of the present invention, and pilot valve and main valve are not positioned at same axis, and the end of pilot valve body 10 is added with plug screw 19.
Claims (4)
1. pressure guiding type water relief valve, comprise main valve and pilot valve, the main valve body of main valve [17] front end is front cover [2] fixedly, main valve body has entrance and exit on [17], be provided with main valve seat [4], main valve housing [6], main valve plug [5] in the main valve body, main valve plug [5] end has main damping valve hole [15], rear-mounted installation main spool spring [12]; Pilot valve is made of pilot valve valve seat [7], pilot valve core [8], pressure adjusting spring [9], has pilot valve damping hole [11] on the pilot valve valve seat [7], it is characterized in that:
(1) described main valve is a cone valve structure, and pilot valve is fixed on the main valve body [17], and pilot valve core has the guide cylinder face on [8], forms matching gap between the endoporus of itself and pilot valve body, makes the pressure adjusting spring chamber become damping cavity [18];
(2) ingress of main valve body [17] before the main valve seat, restrictor ring [3] is set, it radially has the different throttle orifice of a plurality of diameters, front cover [2] is gone up installing pressure retaining adjusting knob [1], the latter and the working position of the chimeric and rotatable restrictor ring of restrictor ring [3] with the adjusting throttle orifice.
2. pressure guiding type water relief valve as claimed in claim 1 is characterized in that: pilot valve is cone valve or ball-valve structure; The main valve plug surface has the ring-type arc groove, and is provided with rubber and plastic combination seal [14].
3. pressure guiding type water relief valve, comprise main valve and pilot valve, the main valve body of main valve [17] front end is front cover [2] fixedly, main valve body has entrance and exit on [17], be provided with main valve seat [4], main valve housing [6], main valve plug [5] in the main valve body, main valve plug [5] end has main damping valve hole [15], rear-mounted installation main spool spring [12]; Pilot valve is made of pilot valve valve seat [7], pilot valve core [8], pressure adjusting spring [9], has pilot valve damping hole [11] on the pilot valve valve seat [7], it is characterized in that:
(1) described main valve is a cone valve structure, and pilot valve is fixed on the main valve body [17], and pilot valve core has the guide cylinder face on [8], forms matching gap between the endoporus of itself and pilot valve body, makes the pressure adjusting spring chamber become damping cavity [18];
(2) ingress of main valve body [17] before front cover [2] is gone up main valve seat is provided with throttle orifice.
4. pressure guiding type water relief valve as claimed in claim 3 is characterized in that: pilot valve is cone valve or ball-valve structure; The main valve plug surface has the ring-type arc groove, and is provided with rubber and plastic combination seal [14].
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100130707A CN100366967C (en) | 2004-04-21 | 2004-04-21 | Leading type water pressure overflow valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100130707A CN100366967C (en) | 2004-04-21 | 2004-04-21 | Leading type water pressure overflow valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1619198A CN1619198A (en) | 2005-05-25 |
| CN100366967C true CN100366967C (en) | 2008-02-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100130707A Expired - Fee Related CN100366967C (en) | 2004-04-21 | 2004-04-21 | Leading type water pressure overflow valve |
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| Country | Link |
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| CN (1) | CN100366967C (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009053635A1 (en) * | 2009-11-17 | 2011-05-19 | Robert Bosch Gmbh | Pilot operated pressure relief valve |
| CN102042432B (en) * | 2010-12-10 | 2012-05-23 | 北京工业大学 | Direct-acting water pressure overflow valve with damping piston |
| CN102454650B (en) * | 2011-09-07 | 2014-07-23 | 广西柳工机械股份有限公司 | Hydraulic differential pilot opening mechanism |
| CN102454652B (en) * | 2011-11-18 | 2014-05-07 | 广西柳工机械股份有限公司 | Adjustable hydraulic pilot opening mechanism |
| CN102943909B (en) * | 2012-10-19 | 2014-04-09 | 华中科技大学 | Differential type water hydraulic relief valve |
| CN104265716B (en) * | 2014-10-23 | 2017-06-16 | 西华大学 | A kind of super-pressure pilot operated compound relief valve |
| CN105422885A (en) * | 2015-11-27 | 2016-03-23 | 苏州市职业大学 | One-way pressure-control tap water valve |
| CN107091369B (en) * | 2017-05-10 | 2023-06-30 | 宁波兴茂电子科技有限公司 | Pilot valve flow characteristic testing device and application method thereof |
| CN108981248A (en) * | 2018-08-23 | 2018-12-11 | 方纪 | A kind of unidirectional refrigeration expansion valve of passive self-adaptive formula |
| CN111219511A (en) * | 2019-10-29 | 2020-06-02 | 北京天地玛珂电液控制系统有限公司 | Electromagnetic unloading valve for aqueous medium mine |
| CN111456977A (en) * | 2020-04-09 | 2020-07-28 | 上海诺玛液压系统有限公司 | High-pressure large-flow inverse proportion overflow valve |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85109329B (en) * | 1985-12-26 | 1988-07-20 | 庄凤龄 | Precursory overflow valve |
| CN2242988Y (en) * | 1996-02-08 | 1996-12-18 | 煤炭科学研究总院北京开采研究所 | Guiding-type safety valve |
| CN1111259C (en) * | 2000-11-14 | 2003-06-11 | 湘潭工学院 | Pilot-type overflow valve |
| CN2697420Y (en) * | 2004-04-21 | 2005-05-04 | 华中科技大学 | Pre-guiding type water pressure overflow valve |
-
2004
- 2004-04-21 CN CNB2004100130707A patent/CN100366967C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85109329B (en) * | 1985-12-26 | 1988-07-20 | 庄凤龄 | Precursory overflow valve |
| CN2242988Y (en) * | 1996-02-08 | 1996-12-18 | 煤炭科学研究总院北京开采研究所 | Guiding-type safety valve |
| CN1111259C (en) * | 2000-11-14 | 2003-06-11 | 湘潭工学院 | Pilot-type overflow valve |
| CN2697420Y (en) * | 2004-04-21 | 2005-05-04 | 华中科技大学 | Pre-guiding type water pressure overflow valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1619198A (en) | 2005-05-25 |
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Granted publication date: 20080206 Termination date: 20140421 |