CN104864137A - Pilot-operated type water pressure overflow valve - Google Patents
Pilot-operated type water pressure overflow valve Download PDFInfo
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- CN104864137A CN104864137A CN201510259603.8A CN201510259603A CN104864137A CN 104864137 A CN104864137 A CN 104864137A CN 201510259603 A CN201510259603 A CN 201510259603A CN 104864137 A CN104864137 A CN 104864137A
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- main valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/10—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with auxiliary valve for fluid operation of the main valve
Abstract
The invention relates to a pilot-operated type water pressure overflow valve which comprises a main valve and a pilot valve. The main valve comprises a main valve body, a main valve sleeve and a main valve element, and the pilot valve comprises a pilot valve body, a pilot valve seat, a pilot valve element and a pilot valve pressure adjusting spring; the main valve element is of a slide valve structure, the end of the main valve element is in a parabola shape and is provided with a throttling groove, four draining holes are formed outward in the surface of the inner wall of the throttling groove, and micro holes are uniformly formed in the outer cylindrical surface of the main valve element matched with the main valve sleeve; the pilot valve element is of a cone valve structure, an annular stepped hole is formed at the cone angle of the end of the inner hole of the pilot valve seat, a guide piston is arranged on the pilot valve element, and a pressure adjusting cavity is defined by the guide piston, a guide cylinder installed on a pressure adjusting screw handle and a valve element hole in the pilot valve body; an annular groove is formed in the end face of the guide piston. By means of the pilot-operated type water pressure overflow valve, the cavitation, vibration and noise can be reduced, the hydrodynamic lubrication performance of the main valve element can be improved, and the wiredrawing corrosion can be reduced.
Description
Technical field
The present invention relates to technical field of valve manufacturing, specifically refer to that a kind of being applicable to, using seawater, fresh water, high water base etc. as the relief valve in the mesohigh water hydraulic system of working medium, particularly relates to a kind of leading type water pressure overflow valve.
Background technique
Water hydraulics is the new technology using natural fresh water, seawater or tap water proxy mineral oil as hydraulic work system medium, the same with hydraulic technology, belongs to hydraulic transmission technology.In the development process of hydraulic transmission technology, water once played very important effect as the media of transmission of power, exchange and control.In shortage of resources and the today of advocating environmental protection, application water mainly contains following advantage as the working medium of hydraulic transmission technology: 1, ecological friendly, environment friendly and pollution-free; 2, clean and safe, can avoid fire; 3, cheap, wide material sources; 4, care and maintenance is easy to.But when using aqueous medium proxy mineral oil as working medium, inharmonious to occur between the water hydraulic relief valve meeting of traditional oils pressurized overflow valve design theory design and hydraulic system, cause the even whole hydraulic work system of valve unstable.
When relief valve uses in aqueous medium, a series of technical problem can be produced, mainly contain:
1, cavitation erosion and cavitation wear: because the pressure for vaporization of aqueous medium is high, the flow velocity at restriction place is also very high, so be easy to produce cavitation erosion in pure water hydraulics throttle valve, cavitate to the destruction percussion that mainly the rear pressure wave produced of bubble collapse is very strong to part surface generation of material surface, compare with mineral oil, the compression shock that water produces when bubbles burst is larger, and collapsing force is stronger;
2, wire drawing erosion and erosion: because the viscosity of water is low, poor lubricity, the velocity ratio oil pressure valve of valve port is high under the same conditions, all the more so under small guide vane, large differential pressure conditions, serious souring can be produced to spool and valve seat, fine particle simultaneously in aqueous medium is carry the surface rushing at part by high-velocity flow, scrape a rule vestige;
3, leakage rate is large: the viscosity due to aqueous medium is approximately the 1/30-1/40 of oil, thus large than the amount of leakage of oil under identical area of passage and differential pressure action, causes system volume decrease in efficiency;
4, compression shock, vibration and noise: the Young's modulus due to aqueous medium is approximately 1.5-2.4 times of hydraulic oil, in water, the velocity of sound is than height in hydraulic oil about 10%, therefore the compressibility of water is little, rigidity large, the transport velocity of pressure surge in water is fast and decay is slow, produce violent vibration & noise, i.e. water hammer.
For reducing vibration, the noise of relief valve, usually take to reduce cone valve semi-cone angle; Pilot valve is provided with damping hole; Add weakening pad in pilot valve chamber and change the distribution of this cavity volume velocity field, or adopt the miniature absorbing principle of weakening plug to eliminate to scream and vibrate; Add guide piston in pilot valve front end, overcome the beat of poppet valve core.According to " leading type water pressure overflow valve " that Chinese Patent Application No. is 200410013070.7 announcements, mainly comprise main valve and pilot valve, be primarily characterized in that: there is guide cylinder face on pilot valve core, form matching gap between itself and the endoporus of pilot valve body, make pressure adjusting spring chamber become damping cavity; The ingress of main valve body before main valve seat, is provided with restrictor ring, throttle orifice that its radial direction has multiple diameter different.The damping that this valve can reduce primary valve operating pressure differential, widen range of regulation, reduces pilot valve side direction runout, increases pilot valve, cavitation resistive property is good, noise is low, good operating stability.But this relief valve cannot reduce the wearing and tearing at main valve plug position, the damping cavity formed in pilot valve, when aqueous medium acts on guide cylinder end face, easily causes a fluid stream line style unstable, produces impact noise.
Summary of the invention
The present invention is in order to overcome deficiency of the prior art, provide a kind of leading type water pressure overflow valve, be applicable to mesohigh water hydraulic system, cavitation damage can be reduced, reduce vibration, noise, improve the hydrodynamic lubrication performance between main valve plug and main valve housing, store the impurity in aqueous medium, reduce wire drawing and corrode.
The present invention is achieved through the following technical solutions:
A kind of leading type water pressure overflow valve, comprise main valve and pilot valve two-part, described main valve comprises main valve body, main valve housing, main valve plug, and main valve housing is arranged in the hole of main valve body, main valve plug is arranged in main valve housing, is provided with main valve Returnning spring in the spring chamber of main valve plug; Described pilot valve comprises pilot valve body, pilot valve valve seat, pilot valve core, pilot valve pressure adjusting spring, and described pilot valve valve seat and pilot valve core are installed in pilot valve body; Described main valve plug is sliding valve structure, the end parabolically shape of main valve plug, throttling groove is offered in the axial direction in its end, this throttling groove is made up of cylindrical section and conical section, outwards radially offer four conduction holes from the cylindrical section inner wall surface of throttling groove, the external cylindrical surface of the main valve plug matched with main valve housing evenly offers micro-shape hole; Described pilot valve core is cone valve structure, the cone angle place of the interior bore ends of pilot valve valve seat offers ring-shaped step hole, pilot valve valve seat and pilot valve core is made to form the valve mouth structure with two-step throttle, described pilot valve core is provided with a guide piston, guide piston be arranged on the guide cylinder on pressure regulation spiral shell handle, the spool bore in pilot valve body forms a pressure regulating cavity jointly; Described guide piston offers the different annular concentric groove of two diameters on a side end face of pilot valve core, the cross section semicircular in shape of circular groove.
As the preferred technical solution of the present invention, described main valve body offers water intake, water outlet and remote control mouth, the aqueous medium flow to from water intake acts on the lower end of main valve plug on the one hand, horizontal liquid resistance hole, vertically liquid resistance hole on the other hand on main valve body communicate with the ante-chamber of pilot valve body, fixer on pilot valve body hinders in the spring chamber of main valve plug, main valve body and pilot valve body offers runner and communicates with water outlet; On valve body, water intake and other interelement of water outlet and hydraulic system adopt board-like to be connected or tubular type is connected.
As the preferred technical solution of the present invention, described main valve body and pilot valve body adopt Austenitic Stainless Steel to make, and anodization is carried out on surface; Main valve plug and pilot valve core take metal as base material, surface spraying zirconia ceramics.
Its working principle is:
Operationally, water intake is connected on hydraulic pressure delivery side of pump to pilot operated compound relief valve, and water outlet is connected with water tank.
1) situation that remote control mouth K does not communicate with outside, is first discussed: aqueous medium enters from water intake, arrive the ante-chamber of pilot valve by horizontal liquid resistance hole, vertically liquid resistance hole, the damping hole in the middle of damping sleeve, acts on the conical surface of pilot valve core.When the inlet pressure of water intake is lower, the pressure of aqueous medium can not overcome the spring force of pilot valve pressure adjusting spring, pilot valve core is closed, because the aqueous medium in valve is inactive liquid, the epicoele of main valve plug is equal with lower cavity pressure, now, main valve plug is in main valve housing bore position under the effect of softer main valve Returnning spring, primary valve close, water intake and water outlet obstructed, aneroid flows through.When the inlet pressure of water intake is higher, when the hydraulic coupling acted on pilot valve core equals the spring force of pilot valve pressure adjusting spring, pilot valve core leaves pilot valve valve seat, open valve port, so the aqueous medium in valve gets back to the water outlet of main valve through the valve port of pilot valve and runner, overflow to water tank; The aqueous medium of main intake valve then adds to the valve port of pilot valve through horizontal liquid resistance hole, vertically liquid resistance hole, because aqueous medium exists local pressure loss through horizontal liquid resistance hole and vertical liquid resistance hole, therefore the inlet pressure of pilot valve is lower than main valve inlet pressure, namely the pressure of main valve plug epicoele is lower than lower cavity pressure, the spring force that main valve plug overcomes main valve Returnning spring under the effect of epicoele and cavity of resorption pressure difference moves up, open primary valve, the aqueous medium of main valve inlet overflows to water tank through primary valve.
2) situation, when the remote control mouth on main valve body is directly connected on water tank: then the pressure of pilot valve ante-chamber and main valve plug epicoele is approximately equal to zero, now pilot valve valve port is closed, valve port opened by the spring force that the cavity of resorption of main valve plug only needs very low pressure just can overcome main valve Returnning spring, water intake and water outlet are communicated, and the aqueous medium that oil hydraulic pump exports all is back in water tank.
3) situation, when the remote control mouth on main valve body connects remote pressure regulating valve: at this moment remote pressure regulating valve just instead of original pilot valve work, regulates the spring force of remote pressure regulating valve, just can regulate the working pressure of the main valve in this leading type water pressure overflow valve.The adjustment pressure of remote pressure regulating valve must be less than the set pressure of the pilot valve of leading type water pressure overflow valve, otherwise remote pressure regulating valve is by inoperative.
Compared with prior art, the invention has the beneficial effects as follows:
1, by parabolic shape is being processed in the front end of main valve plug, the cavitation shock of concentrating can be extended back away from main valve valve port, improve the anti-cavitation ability of main valve plug; By being processed with throttling groove on main valve plug, being conducive to the rigidity improving aqueous medium Flow characteristics, hydraulic radial power being balanced, being applicable in mesohigh hydraulic system; By being processed with conduction hole on main valve plug, the pressure at Main valve outlet place can be improved, reducing the pressure reduction that main valve is imported and exported, suppress cavitation erosion, reduce noise; By being processed with micro-shape hole on main valve plug, improving the hydrodynamic lubrication effect of main valve plug and can impurity be stored, reducing wire drawing and corrode;
2, form the valve mouth structure of two-step throttle between pilot valve valve seat and pilot valve core, when pilot valve core is opened, every grade of valve port all assume responsibility for pressure reduction, can reduce cavitation erosion;
3, by being provided with guide piston and guide cylinder, common composition one pressure regulating cavity, on the one hand, guiding fitting surface between pilot valve core and pilot valve body can reduce the polarization of pilot valve core because causing by uneven radial force, on the other hand, during pilot valve core motion, the pressure change in pressure regulating cavity makes the kinetic damping of spool increase, thus improves the working stability of pilot valve; By offering circular groove on guide piston, the hydraulic power of pilot valve core can be compensated, simultaneously due to the change of liquid flow path direction, producing one and the rightabout jet flow force of pilot valve pressure adjusting spring spring force, improving the stability of pilot valve core stroke.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the worm's eye view in Fig. 1;
Fig. 3 is the A portion enlarged view in Fig. 1;
Fig. 4 is the axonometric drawing of guide piston in the present invention;
Fig. 5 is the sectional view of guide piston in the present invention;
Fig. 6 is the using state figure of remote control mouth water receiving case in the present invention;
Fig. 7 is the using state figure that in the present invention, remote control mouth connects remote pressure regulating valve.
In figure: 1-main valve body; 2-main valve housing; 3-main valve plug; 4-main valve Returnning spring; 5-pilot valve body; 6-pilot valve valve seat; 7-pilot valve core; 8-pilot valve pressure adjusting spring; 9-throttling groove; 10-conduction hole; The micro-shape hole of 11-; 12-step hole; 13-guide piston; 14-guide cylinder; 15-pressure regulation spiral shell handle; 16-pressure regulating cavity; 17-circular groove; 18-spring chamber; 19-main spool spring seat; 20-radial direction through hole; 21-pilot valve spring seat; 22-damping sleeve; A-horizontal liquid resistance hole; B-vertical liquid resistance hole; C-fixer hinders; D-runner; P-water intake; T-water outlet; K-remote control mouth; Y-remote pressure regulating valve.
Embodiment
In order to make object of the present invention, technological scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
As shown in Figure 1, what leading type water pressure overflow valve provided by the invention adopted is secondary concentric structure, and compared with three grades of concentric structures, the valve port area gradient of the pilot operated compound relief valve of secondary concentric structure is greater than three grades of concentric structures, is active in one's movements.
This leading type water pressure overflow valve comprises main valve and pilot valve two-part, and the shaft axis of main valve is mutually vertical with the shaft axis of pilot valve.
As shown in Figure 1 and Figure 2, main valve comprises main valve body 1, main valve housing 2, main valve plug 3, and main valve housing 2 is arranged in the hole of main valve body 1, and main valve plug 3 is arranged in main valve housing 2; Be provided with main valve Returnning spring 4 in the spring chamber 18 of main valve plug 3, the end contact of main valve Returnning spring 4 on the lower end surface of spring chamber 18, and is arranged on main spool spring seat 19, the helical spring that main valve Returnning spring 4 selects rigidity less.Main valve housing 2 offers radial direction through hole 20, sealed by rectangular seal and elliptical seal ring between main valve housing 2 and main valve body 1, seal ring adopts nitrile rubber to make, it has extremely low friction factor and good self-lubricating property, long service life, sound state good sealing effect.
As shown in Figure 1; what main valve plug 3 adopted is sliding valve structure; parabolic shape is processed in the end of main valve plug 3; adopt the main valve plug 3 of this shape; the cavitation shock of concentrating can be extended back away from main valve valve port; this make to cavitate position and damaged location of producing are inconsistent, protection main valve valve port, the anti-cavitation ability of raising main valve plug 3.
Throttling groove 9 is offered along its direction of axis line in the end of main valve plug 3, this throttling groove 9 is made up of cylindrical section and conical section, the throttling groove area of passage variance ratio of cylindrical section is constant, be conducive to the rigidity improving aqueous medium Flow characteristics, the throttling groove of conical section can make hydraulic radial power be balanced, and is applicable in mesohigh hydraulic system.Outwards radially offer four conduction holes 10 from the cylindrical section inner wall surface of throttling groove 9, the pressure at Main valve outlet place can be improved, reduce the pressure reduction that main valve is imported and exported, effectively suppress cavitation erosion, reduce vibration & noise.
As shown in Figure 1, friction pair is formed between the internal surface of main valve housing 2 and the cylindrical outer surface of main valve plug 3, theoretical according to wedge shape dynamic pressure: viscous fluid (what adopt in the present embodiment is water) along with the motion of friction pair be brought into and be full of there is wedge gap surface of friction pair between, produce hydrodynamic pressure and carry out balance external load, reach good lubrication object.By evenly offering micro-shape hole 11 on the external cylindrical surface of main valve plug 3, the hydrodynamic lubrication performance of main valve plug 3 can be improved, according to Fluent software emulation, pressure distribution curve with the surface of the main valve plug 3 in micro-shape hole 11 is similar to sinusoidal curve, and zone of positive pressure area is substantially equal with negative pressuren zone area.Along with the increase of micro-shape hole 11 degree of depth, main valve plug 3 bearing capacity first increases and then reduces gradually, and there is optimum span, when the degree of depth is between 3 μm-4 μm, force value is relatively high, and hydrodynamic lubrication effect is better; Along with the increase of micro-shape hole 11 radius, the bearing capacity of main valve plug 3 also increases, and there is optimum span, when radius is between 25 μm-45 μm, hydrodynamic lubrication effect is better.Micro-shape hole 11 as nail collection slot, can hold the impurity particle carried in the abrasive dust and aqueous medium produced because of the boundary lubrication between main valve housing 2 and main valve plug 3 or dry friction, thus reduces wear, extend the working life of main valve plug 3 simultaneously.
In the present embodiment, micro-shape hole 11 adopts laser beam machining to form, and the specific power of laser beam is high, through optics into focus, the minimum hot spot of micron dimension can be formed on the surface of main valve plug 3, belong to noncontact procession, processing speed is fast, and efficiency is high, noiseless, moving speed of laser beam is very fast simultaneously, and heat affected zone is little, and thermal distortion is very little.
As shown in Figure 1, pilot valve comprises pilot valve body 5, pilot valve valve seat 6, pilot valve core 7, pilot valve pressure adjusting spring 8, and described pilot valve valve seat 6 and pilot valve core 7 are installed in pilot valve body 5.
As shown in Figure 1 and Figure 2, what pilot valve core 7 adopted is cone valve structure, cone valve structure seals by the conical surface of pilot valve core 7 and pilot valve valve seat 6, sealing force increases along with increasing of pressure, good sealing effect, the adjustment pressure that easy acquisition is higher, reduces the fit tolerance between moving element, realizes zero leakage; Simultaneously the adaptability of cone valve type structure to aqueous medium is relatively good, can the wearing and tearing of auto-compensation pilot valve core 7.But the spool of cone valve type structure is in movement process, both axial vibration was done, do again and radially wobble, two kinds of motions all produce noise, therefore on pilot valve core 7, a guide piston 13 is provided with, guide piston 13 be arranged on the guide cylinder 14 on pressure regulation spiral shell handle 15, the spool bore in pilot valve body 5 forms a pressure regulating cavity 16 jointly, guide piston 13, be Spielpassung between guide cylinder 14 and the spool bore of pilot valve and install.By being provided with guide piston 13, radially wobbling of pilot valve core 7 can be overcome.When pilot valve core 7 is when opening, pilot valve core 7 produces mobile, the volume of pressure regulating cavity 16 reduces, pressure raises, and now, pressure regulating cavity 16 produces an additional forces contrary with pilot valve core 7 moving direction, thus add the kinetic damping of pilot valve core 7, improve stroke stability, prevent pilot valve core 7 from vibrating, reduce noise.
Pressure regulation spiral shell handle 15 is arranged in pilot valve body 5, is sealed between described pilot valve body 5 and pressure regulation spiral shell handle 15 by rectangular seal.Be provided with pilot valve spring seat 21 in the end of pressure regulation spiral shell handle 15, pilot valve pressure adjusting spring 8 is arranged on pilot valve spring seat 21, the helical spring selecting rigidity larger of pilot valve pressure adjusting spring 8, can the frequency of slowing down vibration and amplitude, reduces noise.
As shown in Figure 1, the front end of first pilot valve seat 6 is provided with damping sleeve 22, and the centerline direction along damping sleeve 22 offers damping hole.
As shown in Figure 1, Figure 4, Figure 5, the side end face of guide piston 13 towards pilot valve core 7 offers the annular concentric groove 17 that two diameters are different, the cross section semicircular in shape of circular groove 17, chamfer machining process is carried out in one end of guide piston 13.The direction of liquid stream can be changed by arranging circular groove 17, on the one hand in order to compensate the hydraulic power of pilot valve core 7, on the other hand due to the change of liquid flow path direction, producing one and the rightabout jet flow force of pilot valve pressure adjusting spring 8 spring force.
As shown in Figure 1, Figure 3, in pilot valve, suitably reduce the semi-cone angle θ of pilot valve core 7, the hydraulic power rigidity of pilot valve can be reduced, improve the stability of valve, the support reaction that pilot valve core 7 contacts with pilot valve valve seat 6 can be increased simultaneously, improve sealability.But the semi-cone angle θ of pilot valve core 7 obtains too small, the support reaction that pilot valve core 7 can be caused to contact with pilot valve valve seat 6 is excessive, affects the overflow performance of valve.In the present embodiment, the semi-cone angle θ of pilot valve core 7 gets 20 °.
As shown in Figure 1, Figure 3, the cone angle place of the interior bore ends of pilot valve valve seat 6 offers ring-shaped step hole 12, makes pilot valve valve seat 6 and pilot valve core 7 form the valve mouth structure with two-step throttle, when pilot valve core 7 is opened, every grade of valve port all assume responsibility for pressure reduction, can reduce cavitation erosion.
As shown in Figure 1 and Figure 2, main valve body 1 offers water intake P, water outlet T and remote control mouth K, in the runner of water intake P and water outlet T, bending part all adopts arc transition, when aqueous medium impacts circular arc bending part, can make to impact splash and offset part energy, make flow velocity be tending towards even as early as possible.The aqueous medium flow to from water intake P acts on the lower end of main valve plug 3 on the one hand, horizontal liquid resistance hole a, vertically liquid resistance hole b on the other hand on main valve body 1 communicate with the ante-chamber of pilot valve body 5, fixer resistance c on pilot valve body 5, in the spring chamber 18 of main valve plug 3, main valve body 1 and pilot valve body 5 offers runner d and water outlet T-phase logical.
Simultaneously because the hardness of material is the principal element affecting cavitation erosion, the anti-cavitation ability of spool improves along with the raising of material hardness, the fatigue strength of cavitation erosion and material also has relation, this is because the bubble constantly generated constantly can produce the impact of repeatability to spool and valve seat.The hardness of material corrodes wire drawing and has a great impact, and material hardness is higher, and the ability of the erosion of tension silk and erosion is stronger.Therefore, in the present embodiment:
Main valve body 1 and pilot valve body 5 adopt Austenitic Stainless Steel (1Cr18Ni9Ti) to make, anodization (adopting soft or hard anodized process according to actual needs) is carried out on surface, effectively can prevent the corrosion of aqueous medium, and carry out Quenching Treatment, make the hardness of main valve body 1 and pilot valve body 5 reach HRC33-40;
Main valve housing 2 and pilot valve valve seat 6 adopt copper base alloy to make, and rely on copper base alloy to form patina and reduce cavitation erosion;
Main valve plug 3 and pilot valve core 7 take metal as base material, surface spraying zirconia ceramics, owing to remaining the obdurability of metal and ceramic high hardness and excellent wear-resistant corrosion resistance, and overcome the fragility of zirconia ceramics, ceramic absorbing performance is good simultaneously, be conducive to the shock wave cutting down cavitation erosion generation, reduce the vibration of system.
As shown in Figure 6, when the remote control mouth K on main valve body 1 is directly connected on water tank, now the pressure of pilot valve ante-chamber and main valve plug epicoele is approximately equal to zero, now pilot valve valve port is closed, valve port opened by the spring force that the cavity of resorption of main valve plug only needs very low pressure just can overcome main valve Returnning spring, water intake P and water outlet T-phase are led to, and the aqueous medium that oil hydraulic pump exports all is back in water tank.
As shown in Figure 7, situation when the remote control mouth K on main valve body 1 meets remote pressure regulating valve Y: at this moment remote pressure regulating valve Y just instead of original pilot valve work, regulate the spring force of remote pressure regulating valve Y, just can regulate the working pressure of the main valve in this leading type water pressure overflow valve.The adjustment pressure of remote pressure regulating valve must be less than the set pressure of the pilot valve of leading type water pressure overflow valve, otherwise remote pressure regulating valve is by inoperative.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. a leading type water pressure overflow valve, comprise main valve and pilot valve two-part, described main valve comprises main valve body (1), main valve housing (2), main valve plug (3), main valve housing (2) is arranged in the hole of main valve body (1), main valve plug (3) is arranged in main valve housing (2), is provided with main valve Returnning spring (4) in the spring chamber (18) of main valve plug (3); Described pilot valve comprises pilot valve body (5), pilot valve valve seat (6), pilot valve core (7), pilot valve pressure adjusting spring (8), and described pilot valve valve seat (6) and pilot valve core (7) are installed in pilot valve body (5); It is characterized in that:
Described main valve plug (3) is sliding valve structure, the end parabolically shape of main valve plug (3), throttling groove (9) is offered in the axial direction in its end, this throttling groove (9) is made up of cylindrical section and conical section, outwards radially offer four conduction holes (10) from the cylindrical section inner wall surface of throttling groove (9), the external cylindrical surface of the main valve plug (3) matched with main valve housing (2) evenly offers micro-shape hole (11);
Described pilot valve core (7) is cone valve structure, the cone angle place of the interior bore ends of pilot valve valve seat (6) offers ring-shaped step hole (12), pilot valve valve seat (6) and pilot valve core (7) is made to form the valve mouth structure with two-step throttle, described pilot valve core (7) is provided with a guide piston (13), guide piston (13) be arranged on the guide cylinder (14) on pressure regulation spiral shell handle (15), the spool bore in pilot valve body (5) forms a pressure regulating cavity (16) jointly;
Described guide piston (13) offers the different annular concentric groove (17) of two diameters on a side end face of pilot valve core (7), the cross section semicircular in shape of circular groove (17).
2. leading type water pressure overflow valve according to claim 1, it is characterized in that: described main valve body (1) offers water intake (P), water outlet (T) and remote control mouth (K), the aqueous medium flow to from water intake (P) acts on the lower end of main valve plug (3) on the one hand, horizontal liquid resistance hole (a) on the other hand on main valve body (1), vertical liquid resistance hole (b) communicates with the ante-chamber of pilot valve body (5), fixer resistance (c) on pilot valve body (5) is in the spring chamber (18) of main valve plug (3), main valve body (1) and pilot valve body (5) offer runner (d) communicate with water outlet (T).
3. leading type water pressure overflow valve according to claim 1 and 2, is characterized in that: described main valve body (1) and pilot valve body (5) adopt Austenitic Stainless Steel to make, and anodization is carried out on surface; Main valve plug (3) and pilot valve core (7) take metal as base material, surface spraying zirconia ceramics.
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| CN105927771A (en) * | 2016-06-07 | 2016-09-07 | 安徽贝德泵阀科技股份有限公司 | Throttle valve |
| CN107631065A (en) * | 2016-07-18 | 2018-01-26 | 鞍钢股份有限公司 | A kind of constant flow valve and its method of work |
| CN107762994A (en) * | 2016-08-18 | 2018-03-06 | 梅扎零件有限公司 | Overflow valve and its operation method |
| CN109854563A (en) * | 2019-03-05 | 2019-06-07 | 安徽理工大学 | A kind of pressure regulation pressure limiting combination overflow valve |
| CN110056689A (en) * | 2019-03-20 | 2019-07-26 | 合肥壹点通信息科技有限公司 | A kind of pilot operated compound relief valve |
| CN110159772A (en) * | 2019-06-04 | 2019-08-23 | 四川长仪油气集输设备股份有限公司 | A kind of throttle valve of three-level throttle type |
| CN110230617A (en) * | 2019-06-24 | 2019-09-13 | 徐州阿马凯液压技术有限公司 | A kind of novel load holding valve |
| CN110319242A (en) * | 2019-08-05 | 2019-10-11 | 安徽理工大学 | A kind of rotary spool switching mechanism based on bidirectional torsion spring |
| CN111120698A (en) * | 2019-12-18 | 2020-05-08 | 中国航空工业集团公司西安飞行自动控制研究所 | Pilot valve and main valve integrated valve combination |
| CN111315991A (en) * | 2019-03-28 | 2020-06-19 | 深圳市大疆创新科技有限公司 | Pump device and agricultural plant protection machine |
| CN111539075A (en) * | 2020-04-02 | 2020-08-14 | 张祝 | Method for constructing cone angle deviation precision model of valve sleeve inner conical surface |
| CN113719657A (en) * | 2021-08-30 | 2021-11-30 | 华中科技大学 | Pressure compensation type valve core assembly, direct-acting overflow valve and pilot operated overflow valve |
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| CN105927771A (en) * | 2016-06-07 | 2016-09-07 | 安徽贝德泵阀科技股份有限公司 | Throttle valve |
| CN107631065A (en) * | 2016-07-18 | 2018-01-26 | 鞍钢股份有限公司 | A kind of constant flow valve and its method of work |
| CN107631065B (en) * | 2016-07-18 | 2019-08-06 | 鞍钢股份有限公司 | A kind of constant flow valve and its working method |
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| CN109854563A (en) * | 2019-03-05 | 2019-06-07 | 安徽理工大学 | A kind of pressure regulation pressure limiting combination overflow valve |
| CN109854563B (en) * | 2019-03-05 | 2023-08-08 | 安徽理工大学 | Pressure regulating and limiting combined overflow valve |
| CN110056689A (en) * | 2019-03-20 | 2019-07-26 | 合肥壹点通信息科技有限公司 | A kind of pilot operated compound relief valve |
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| CN110159772A (en) * | 2019-06-04 | 2019-08-23 | 四川长仪油气集输设备股份有限公司 | A kind of throttle valve of three-level throttle type |
| CN110230617A (en) * | 2019-06-24 | 2019-09-13 | 徐州阿马凯液压技术有限公司 | A kind of novel load holding valve |
| CN110230617B (en) * | 2019-06-24 | 2020-04-07 | 徐州阿马凯液压技术有限公司 | Novel load holding valve |
| CN110319242A (en) * | 2019-08-05 | 2019-10-11 | 安徽理工大学 | A kind of rotary spool switching mechanism based on bidirectional torsion spring |
| CN110319242B (en) * | 2019-08-05 | 2024-03-26 | 安徽理工大学 | Rotary valve core switching mechanism based on bidirectional torsion spring |
| CN111120698A (en) * | 2019-12-18 | 2020-05-08 | 中国航空工业集团公司西安飞行自动控制研究所 | Pilot valve and main valve integrated valve combination |
| CN111539075A (en) * | 2020-04-02 | 2020-08-14 | 张祝 | Method for constructing cone angle deviation precision model of valve sleeve inner conical surface |
| CN111539075B (en) * | 2020-04-02 | 2023-04-18 | 苏州萨伯工业设计有限公司 | Method for constructing cone angle deviation precision model of valve sleeve inner conical surface |
| CN113719657A (en) * | 2021-08-30 | 2021-11-30 | 华中科技大学 | Pressure compensation type valve core assembly, direct-acting overflow valve and pilot operated overflow valve |
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