CN103047211A - Two-position four-way solenoid globe reversing valve - Google Patents

Two-position four-way solenoid globe reversing valve Download PDF

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Publication number
CN103047211A
CN103047211A CN2013100037590A CN201310003759A CN103047211A CN 103047211 A CN103047211 A CN 103047211A CN 2013100037590 A CN2013100037590 A CN 2013100037590A CN 201310003759 A CN201310003759 A CN 201310003759A CN 103047211 A CN103047211 A CN 103047211A
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China
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steel ball
chamber
power amplifier
valve
piston
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CN2013100037590A
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Chinese (zh)
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CN103047211B (en
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袁庆斌
龚安友
江志农
张进杰
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Beijing University of Chemical Technology
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Beijing University of Chemical Technology
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Publication of CN103047211A publication Critical patent/CN103047211A/en
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Publication of CN103047211B publication Critical patent/CN103047211B/en
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Abstract

A two-position four-way solenoid globe reversing valve comprises an electromagnet and a valve body. The valve body is provided with a hydraulic pilot level and a hydraulic power amplification level inside. The hydraulic power amplification level comprises a valve seat. An ejector rod is arranged in the valve seat. Double balls and a cork are arranged at two ends of the ejector rod. The hydraulic pilot level is arranged at the output end of the electromagnet. The hydraulic power amplification level includes two branches, and each branch comprises a valve seat; a steel ball is arranged in the valve seat, and a valve sleeve and a piston form a moving pair; one end of the piston is communicated with the hydraulic pilot level, and the other end of the piston is connected with the steel ball and a spring; an oil duct of the valve body is connected to one end of the steel ball; a support and the like is arranged between the valve sleeve and the valve seat. Therefore, the two-position four-way solenoid globe reversing valve is formed. The problem that other like two-position four-way reversing valves (such as solenoid reversing valves, proportional valves and servo valves) with high requirements on oil cleanliness are prone to blocking, locking and drifting.

Description

A kind of two-position four-way electromagnetic ball type reversing valve
Technical field
The present invention relates to a kind of two-position four-way electromagnetic ball type reversing valve, be used for the industrial hydraulic system, be used for the control oil cylinder and do the reciprocating reversing motion.
Background technique
At present, two four-way electromagnetic reversing valve working principles using in the hydraulic system both at home and abroad mostly are: adopt electromagnet suction to remove to drive the guiding valve piston with push rod, overcoming the spring force at piston two ends, thereby make piston produce displacement, reach the purpose of control hydraulic oil commutation.Because the solenoid directional control valve electromagnet suction is limited, in case piston is done in the displacement movement process jagged in the hydraulic oil or fibrous object enters in the slideway of piston, electromagnet suction or spring are tried hard to recommend motionless piston and are moved, and piston just is stuck, and causes the control error.
Two four-way electromagnetic balls of the present invention formula selector valve is exactly a kind of novel product of developing for solving the frequent jammed problem of solenoid directional control valve, its structure is to adopt the electromagnet push rod to promote the hydraulic coupling that the action of pilot stage steel ball makes it to produce amplification to go to control the action of hydraulic pressure power amplifier level steel ball, and reaches the purpose of control hydraulic oil commutation.
Summary of the invention
The object of the invention is to provide a kind of two-position four-way electromagnetic ball type reversing valve, solve other electro-hydraulic reversing valves, strict to oil cleanliness such as solenoid directional control valve, Proportional valve etc., easily produce the difficult problem of blocking up, block, floating, have≤the dynamic response quality of 20ms open and close amount, leading world standard, long service life.
A kind of two-position four-way electromagnetic ball type reversing valve is characterized in that:
1) the selector valve agent structure comprises electromagnet 1, valve body 9, is provided with hydraulic pilot level and hydraulic pressure power amplifier level in the valve body 9, is provided with valve pocket, piston, steel ball, spring in hydraulic pilot level and the hydraulic pressure power amplifier level;
2) the hydraulic pilot level is located at the electromagnet output terminal, comprises push rod 5 between valve seat 3, electromagnet push rod 2, steel ball C4, steel ball D6, steel ball, cock 8, and push rod 5 is triangle with electromagnet push rod 2 cross sections between steel ball; The vertically inner and substantially horizontal of valve seat 3 is got through respectively the hole; The substantially horizontal through hole is shoulder hole, and horizontal hole intermediate portion diameter is less than both sides, and intermediate hole and two side holes attachment portion are the conical surface; Valve seat 3 one ends are installed cock 8 by screw thread, perforate in the middle of the cock 8, and by high pressure oil, valve seat 3 the other ends are installed electromagnet push rod 2; Steel ball C, D can move in valve seat inner horizontal direction through hole, and steel ball C, D diameter are greater than the intermediate hole diameter, less than the two side holes diameter, and steel ball C, D can form sealing surface with the conical surface, the sealing fluid force feed; Valve seat 3 both sides cylindricals are provided with two groups of O RunddichtringOs 7;
3) hydraulic pressure power amplifier level is divided into two-way, all is positioned at hydraulic pilot level below and is vertically side by side and arranges, and two-way comprises respectively valve seat, valve pocket, piston, push rod 15, steel ball, spring, end cap, O RunddichtringO;
Be provided with steel ball E14, steel ball F16 and push rod 15 in the first via power amplifier level valve seat 18, the push rod cross section is triangle, is positioned at the valve seat intermediate throughholes, and steel ball E14 and steel ball F16 lay respectively at push rod 15 two ends; A side is equipped with the spring 17 and steel ball F16 of the first via in the valve seat, and opposite side is equipped with the piston 11 of the first via, steel ball E14; Steel ball F16 spring-loaded, moving displacement are subject to first via power amplifier level valve seat (18), valve body 9 restrictions, and steel ball E14 moving displacement is subjected to piston 11 restrictions of the first via, and piston 11 displacements of the first via then are subjected to 22 restrictions of hydraulic pressure power amplifier level end cap; Move in steel ball E14, the F16 through hole in valve seat, through hole intermediate portion diameter is less than both sides, intermediate hole and two side holes attachment portion are the conical surface, form sealing surface with steel ball E14, steel ball F16 respectively, are connected with piston with high-voltage oil cavity P respectively and are connected in the intermediate throughholes both sides; Valve pocket 10 component movements of the piston 11 of the first via and the first via are secondary, and the piston outside of the first via is hydraulic pressure power amplifier level end cap 22;
Be provided with a steel ball G19 in the second road power amplifier level valve seat 26, the second tunnel piston 23; The the second road power amplifier level valve seat 26 forms a cavity with valve body 9, and steel ball G19 is positioned at cavity, and these cavity both sides connect respectively the piston 23 of high-voltage oil cavity P and the second tunnel by through hole; Steel ball G19 movement position is subject to valve body 9 and the restriction of valve seat 26 conical surfaces; The the second road power amplifier level valve seat 26 is equipped with spring away from electromagnet 1 side, near the electromagnet side the second tunnel piston 23 is installed, the second tunnel piston 23 displacements are subjected to 22 restrictions of hydraulic pressure power amplifier level end cap, and piston 23 1 ends connect active chamber Pc, and the other end can drive steel ball G19 motion; The second tunnel piston 23 and the second tunnel valve pocket piston 24 component movements are secondary, and the second tunnel piston 23 outsides are hydraulic pressure power amplifier level end cap 22;
4) be provided with high-voltage oil cavity P, control chamber Pc, oil back chamber R, active chamber B, active chamber A in the valve body 9, wherein the outlet of high-voltage oil cavity P, oil back chamber R, active chamber B, active chamber A is positioned at valve body 9 lower ends, and control chamber Pc is without oil outlet; Except active chamber A, high-voltage oil cavity P, oil back chamber R, active chamber B center line and each chamber in the valve body 9, all are communicated with outlet from valve body 9 sides by curved channel not at same plane at valve bottom surface center line of discharge;
High-voltage oil cavity P, control chamber Pc, oil back chamber R are arranged in the pilot stage, high-voltage oil cavity P, control chamber Pc and power amplifier level high-voltage oil cavity P, control chamber Pc center line is at same plane, and pilot stage oil back chamber R and power amplifier level oil back chamber R center line are communicated with by curved channel from valve body 9 sides not at same plane;
There are 4 working cavities first via hydraulic pressure power amplifier level inside, be divided into active chamber B, high-voltage oil cavity P, oil back chamber R, control chamber Pc, active chamber B is communicated with outlet in valve body 9 bottoms from valve body 9 sides by curved channel, oil back chamber R is communicated with the second road hydraulic pressure power amplifier level oil back chamber R from valve body 9 sides by curved channel, first via hydraulic pressure power amplifier level high-voltage oil cavity P, control chamber Pc respectively with the second road hydraulic pressure power amplifier level high-voltage oil cavity P, control chamber Pc center line at same plane;
There are 4 working cavities the second road hydraulic pressure power amplifier level inside, is divided into active chamber A, fuel feeding hyperbaric chamber P, oil back chamber R, control chamber Pc; Active chamber A directly is communicated with outlet in valve body 9 bottom surfaces, and fuel feeding hyperbaric chamber P, oil back chamber R are communicated with by the curved channel outlet with the outlet of valve body 9 bottom surfaces.
It is pioneering that structure of the present invention at home and abroad still belongs to, and its commutation thrust is large, reliable, without clamping stagnation, occur without drift, error-free motion, greatly improved reliability, now is applied at PetroChina Company Limited.'s part Gases of Refineries hydrogen production device.
Description of drawings
Fig. 1 is this apparatus structure plan view;
Fig. 2 is this apparatus structure right elevation;
Fig. 3 is this apparatus structure worm's eye view;
Fig. 4 is for existing two kinds of through-flow form schematic representation under this device solenoid valve off-position;
Fig. 5 is for existing two kinds of through-flow form schematic representation under this device solenoid valve "on" position.
Embodiment
Fig. 1 is two-position four-way electromagnetic ball type reversing valve structural front view of the present invention, and 1 represents electromagnet, is DC wet type electromagnet for valve or AC wet type electromagnet for valve, and 9 represent valve body.
Described hydraulic pilot level comprises: 3 represent valve seat, and 2 represent the electromagnet push rod, and 5 represent push rod between steel ball, the push rod two ends are provided with two steel balls between steel ball, and 4 represent steel ball C, and 6 represent steel ball D, 8 represent cock, and valve seat 3 both sides cylindricals are provided with two groups of O RunddichtringOs, and 7 represent one of them seal ring.
Described hydraulic pressure power amplifier level is divided into two-way, and wherein the first via comprises: 18 represent first via power amplifier level valve seat, are provided with two steel balls in 18,14 represent steel ball E, and 16 represent steel ball F, and 15 represent push rod, 17 represent the spring of the first via, and 16 are pre-stressed to 18 conical surface seal face by 17; 10 represent the valve pocket of the first via, and 11 represent the piston of the first via, and 10 and 11 component movements are secondary, and 11 1 ends are communicated with the hydraulic pilot level, and the other end driving 14,12 represents the support of the first via, and by the support location, 13 represent the O RunddichtringO, make separation seal between 18 and 10.
The second the tunnel comprises: 26 represent the second tunnel valve seat, are provided with steel ball G in 26, and 19 represent steel ball G, and 20 represent the second tunnel spring, and 19 are pre-stressed to 26 conical surface seal face by 20; 24 represent the second tunnel valve pocket, and 23 represent the second tunnel piston, and 23 and 24 component movements are secondary, and 23 1 ends are communicated with the hydraulic pilot level, and by support 25 location, 25 represented the second tunnel support between the other end drove 19,24 and 26, and 13 represent the O RunddichtringO, make separation seal.
21 represent hydraulic pressure power amplifier level end-face seal ring, and 22 represent hydraulic pressure power amplifier level end cap, play location and seal action.
Fig. 2, Fig. 3 are respectively this apparatus structure right elevation and worm's eye view, P among Fig. 3 wherein, and R, A, B represent respectively aforementioned fuel feeding high-voltage oil cavity P, oil back chamber R, active chamber A, active chamber B is in the outlet of valve seat 9 bottoms.
Two-position four-way electromagnetic ball type reversing valve actual act principle of the present invention is as follows.
Electromagnet is as the actuating force source of automatically controlling, and valve body is the withstand voltage body that supports and contain each member.The hydraulic pilot level is by two steel balls, valve seat, and cock, the O RunddichtringO, push rod forms; Hydraulic pressure power amplifier level two-way is respectively by piston, valve pocket, and valve seat, support, the O RunddichtringO, steel ball, spring, end cap forms.
The hydraulic pilot level work has two states, high pressure conditions and low-pressure state; Under the low-pressure state, electromagnet 1 no electric circuit, under the active force of high pressure oil P steel ball D6 is being pressed on the conical surface of valve seat 3 away from the electromagnet side tightly, blocking-up sealed high pressure oil P enters control chamber Pc, simultaneously steel ball D6 promotion cross section is that push rod 5 is opened steel ball C4 and valve seat 3 near the conical surface of electromagnet sides between leg-of-mutton steel ball to moving near the electromagnet direction, control chamber Pc is communicated with oil back chamber R, and control chamber Pc is low pressure, and the power amplifier level is not driven; Under the high pressure conditions, electromagnet 1 energising, steel ball C4 is being pressed on valve seat 3 near on the conical surface of electromagnet side by the electromagnet push rod under the ferreous effect of electromagnetism, blocking-up control chamber Pc is communicated with oil back chamber R, push rod 5 is opened steel ball D6 and valve seat 3 away from the conical surface of electromagnet side to away from the motion of electromagnet direction between simultaneously steel ball C4 promotion steel ball, makes fuel feeding high pressure oil P enter control chamber Pc, control chamber Pc is high pressure, in order to drive the power amplifier level.
To first via hydraulic pressure power amplifier level: when the electromagnet no electric circuit, control chamber Pc is low pressure, under the active force of spring 17 precompressions and high-voltage oil cavity P internal pressure, steel ball F16 is pressed on the sealing cone of valve seat 18 away from the electromagnet side tightly, blocking-up fuel feeding hyperbaric chamber P oil pressure enters active chamber B, steel ball F16 promotes push rod 15 and opens steel ball E14 and valve seat 18 to moving near the electromagnet direction near the conical surface of electromagnet sides simultaneously, and active chamber B is communicated with oil back chamber R; When electromagnet is switched on, control chamber Pc is high pressure, piston 11 is to moving away from the electromagnet direction, drive simultaneously steel ball E14, push rod 15, steel ball F16 integral body to moving away from the electromagnet direction, steel ball E14 is pressed on the close electromagnet side sealing conical surface of valve seat 18 under piston 11 effects tightly, and blocking-up active chamber B is communicated with oil back chamber R, under push rod 15 thrust, open steel ball F16 and valve seat 18 at the sealing cone away from the electromagnet side, fuel feeding hyperbaric chamber P is communicated with active chamber B.
To the second road hydraulic pressure power amplifier level: when the electromagnet no electric circuit, control chamber Pc is low pressure, and steel ball G19 under the hydraulic coupling force action, forms sealing surface with valve seat 26 conical surfaces in spring 20 precompressions and high-voltage oil cavity P, fuel feeding high-voltage oil cavity P is communicated with active chamber A; When electromagnet is switched on, control chamber Pc is high pressure, piston 23 is under the high pressure oil effect at control chamber Pc, to away from electromagnet direction motion, and promote steel ball G19 and be synchronized with the movement, open the sealing surface of steel ball G19 and valve seat 26 conical surfaces formation, when steel ball G19 continues to moving away from electromagnet 1 direction, form sealing surface with valve body 9 conical surfaces, blocking-up fuel feeding hyperbaric chamber P is communicated with active chamber A, and oil back chamber R is communicated with active chamber A;
Hydraulic pressure power amplifier level is controlled by the hydraulic pilot level, is two kinds of operating modes: 1, electromagnet 1 no electric circuit, and pilot stage Pc is low pressure, power amplifier level direction of flow function is P → A, B → R; 2, electromagnet 1 energising, pilot stage Pc is high pressure, makes fluid reversing P → B, A → R realizes the commutation function of two four-way electromagnetic ball formula selector valves.
Two-position four-way electromagnetic ball type reversing valve hydraulic system schematic symbol diagram of the present invention such as Fig. 4, shown in Figure 5, Fig. 4 is two kinds of through-flow forms of existence under the solenoid valve off-position, there are two kinds of through-flow forms in Fig. 5 under the solenoid valve "on" position.
Two-position four-way electromagnetic ball type reversing valve structural feature of the present invention is to adopt commutation that the motion of steel ball controls selector valve and close, the gap of steel ball and valve seat is greater than 0.5mm, and the matching gap of other selector valves is less than 0.01mm, two-position four-way electromagnetic ball type reversing valve of the present invention goes to promote hydraulic pressure power amplifier level by the amplification of prestage hydraulic pressure simultaneously, its thrust is larger more than 20 times than traditional solenoid directional control valve, therefore commutation of the present invention can produce clamping stagnation and drift with not closing, less demanding to oil cleanliness, can be at NAS1638, under 10 grades of fluid conditions, work safely, other electro-hydraulic reversing valves have been solved, such as solenoid directional control valve, Proportional valve is strict to oil cleanliness, easily produces stifled, card, a difficult problem of floating.
Two-position four-way electromagnetic ball type reversing valve of the present invention adopts modularization composite structure, between valve body of the present invention and each part requirement of the dimensional accuracy of matching hole and surface finishment than other similar selector valves require much lower, the part processing cost is low, and up-to-standard rate is high; Adopt simultaneously modularization composite structure, make assembling simple, reliable performance has solved a difficult problem of very easily cutting brokenly the O RunddichtringO when assembling the O RunddichtringO by the valve body oil through; But also can according to actual hydraulic pressure system power size requirements, make two four-way electromagnetic ball formula selector valves of various flows.
Two-position four-way electromagnetic ball type reversing valve dynamic response of the present invention is effective, opens the time≤20ms of valve and pass valve, can be applicable to high-quality Hydrauservo System, substitutes existing electro-hydraulic reversing valve, solenoid directional control valve, Proportional valve, servovalve etc.

Claims (1)

1. two-position four-way electromagnetic ball type reversing valve is characterized in that:
1) the selector valve agent structure comprises electromagnet (1), valve body (9), is provided with hydraulic pilot level and hydraulic pressure power amplifier level in the valve body (9), is provided with valve pocket, piston, steel ball, spring in hydraulic pilot level and the hydraulic pressure power amplifier level;
2) the hydraulic pilot level is located at the electromagnet output terminal, comprise valve seat (3), electromagnet push rod (2), steel ball C(4), steel ball D(6), push rod (5) between steel ball, cock (8), push rod between steel ball (5) is triangle with electromagnet push rod (2) cross section; Valve seat (3) inner vertically and substantially horizontal get through respectively the hole; The substantially horizontal through hole is shoulder hole, and horizontal hole intermediate portion diameter is less than both sides, and intermediate hole and two side holes attachment portion are the conical surface; Valve seat (3) one ends are installed cock (8) by screw thread, perforate in the middle of the cock (8), and by high pressure oil, valve seat (3) the other end is installed electromagnet push rod (2); Steel ball C, D can move in valve seat inner horizontal direction through hole, and steel ball C, D diameter are greater than the intermediate hole diameter, less than the two side holes diameter, and steel ball C, D can form sealing surface with the conical surface, the sealing fluid force feed; Valve seat (3) both sides cylindrical is provided with two groups of O RunddichtringOs (7);
3) hydraulic pressure power amplifier level is divided into two-way, all is positioned at hydraulic pilot level below and is vertically side by side and arranges, and two-way comprises respectively valve seat, valve pocket, piston, push rod (15), steel ball, spring, end cap, O RunddichtringO;
Be provided with steel ball E(14 in the first via power amplifier level valve seat (18)), steel ball F(16) and push rod (15), the push rod cross section is triangle, is positioned at the valve seat intermediate throughholes, steel ball E(14) with steel ball F(16) lay respectively at push rod (15) two ends; A side is equipped with the spring (17) and steel ball F(16 of the first via in the valve seat), opposite side is equipped with the piston (11) of the first via, steel ball E(14); Steel ball F(16) spring-loaded, moving displacement is subject to first via power amplifier level valve seat (18), valve body (9) restriction, steel ball E(14) moving displacement is subjected to piston (11) restriction of the first via, and the piston of the first via (11) displacement then is subjected to hydraulic pressure power amplifier level end cap (22) restriction; Steel ball E(14), F(16) move in the through hole in valve seat, through hole intermediate portion diameter is less than both sides, intermediate hole and two side holes attachment portion are the conical surface, respectively with steel ball E(14), steel ball F(16) form sealing surface, the intermediate throughholes both sides are connected 11 with high-voltage oil cavity P with piston respectively) be connected; Valve pocket (10) component movement of the piston of the first via (11) and the first via is secondary, and the piston outside of the first via is hydraulic pressure power amplifier level end cap (22);
Be provided with a steel ball G(19 in the second road power amplifier level valve seat (26)), the second tunnel piston (23); The the second road power amplifier level valve seat (26) forms a cavity, steel ball G(19 with valve body (9)) be positioned at cavity, these cavity both sides connect respectively the piston (23) of high-voltage oil cavity P and the second tunnel by through hole; Steel ball G(19) movement position is subject to valve body (9) and the restriction of valve seat (26) conical surface; The the second road power amplifier level valve seat (26) is equipped with spring away from electromagnet (1) side, near the electromagnet side the second tunnel piston (23) is installed, the second tunnel piston (23) displacement is subjected to hydraulic pressure power amplifier level end cap (22) restriction, piston (23) one ends connect active chamber Pc, and the other end can drive steel ball G(19) motion; The second tunnel piston (23) and the second tunnel valve pocket piston (24) component movement are secondary, and the second tunnel piston (23) outside is hydraulic pressure power amplifier level end cap (22);
4) be provided with high-voltage oil cavity P, control chamber Pc, oil back chamber R, active chamber B, active chamber A in the valve body (9), wherein the outlet of high-voltage oil cavity P, oil back chamber R, active chamber B, active chamber A is positioned at valve body (9) lower end, and control chamber Pc is without oil outlet; Except active chamber A, high-voltage oil cavity P, oil back chamber R, active chamber B center line and each chamber in the valve body (9), all are communicated with outlet from valve body (9) side by curved channel not at same plane at valve bottom surface center line of discharge;
High-voltage oil cavity P, control chamber Pc, oil back chamber R are arranged in the pilot stage, high-voltage oil cavity P, control chamber Pc and power amplifier level high-voltage oil cavity P, control chamber Pc center line is at same plane, pilot stage oil back chamber R and power amplifier level oil back chamber R center line are communicated with by curved channel from valve body (9) side not at same plane;
There are 4 working cavities first via hydraulic pressure power amplifier level inside, be divided into active chamber B, high-voltage oil cavity P, oil back chamber R, control chamber Pc, active chamber B is communicated with outlet in valve body (9) bottom from valve body (9) side by curved channel, oil back chamber R is communicated with the second road hydraulic pressure power amplifier level oil back chamber R from valve body (9) side by curved channel, first via hydraulic pressure power amplifier level high-voltage oil cavity P, control chamber Pc respectively with the second road hydraulic pressure power amplifier level high-voltage oil cavity P, control chamber Pc center line at same plane;
There are 4 working cavities the second road hydraulic pressure power amplifier level inside, is divided into active chamber A, fuel feeding hyperbaric chamber P, oil back chamber R, control chamber Pc; Active chamber A directly is communicated with outlet in valve body (9) bottom surface, and fuel feeding hyperbaric chamber P, oil back chamber R are communicated with by the curved channel outlet with the outlet of valve body (9) bottom surface.
CN201310003759.0A 2013-01-06 2013-01-06 Two-position four-way solenoid globe reversing valve Expired - Fee Related CN103047211B (en)

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CN201310003759.0A CN103047211B (en) 2013-01-06 2013-01-06 Two-position four-way solenoid globe reversing valve

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109026876A (en) * 2018-08-30 2018-12-18 安徽恒立通液压气动技术有限公司 A kind of two position and four-way reversing valves for emulsion

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US4997004A (en) * 1986-01-29 1991-03-05 Bkm, Inc. High cycle solenoid valve
US5323809A (en) * 1991-10-10 1994-06-28 Hydraulik-Ring Gmbh Hydraulic solenoid valve
DE4317706A1 (en) * 1993-05-27 1994-12-01 Rexroth Mannesmann Gmbh Directional seat valve actuated by external force
CN201344288Y (en) * 2008-12-19 2009-11-11 上海电气液压气动有限公司 Dual-electromagnet two-position four-way ball valve
CN201521675U (en) * 2009-09-24 2010-07-07 上海航海设备有限责任公司 Six-way radial ball type electromagnetic reversing valve
CN201539457U (en) * 2009-10-29 2010-08-04 宁波市博尔法液压有限公司 Ball-type electromagnetic directional valve
CN202597305U (en) * 2012-04-10 2012-12-12 龚安友 Electromagnetic ball type reversing valve

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4301715A (en) * 1979-12-26 1981-11-24 International Telephone And Telegraph Corporation 4-Way, 2-position pilot valve
US4997004A (en) * 1986-01-29 1991-03-05 Bkm, Inc. High cycle solenoid valve
US5323809A (en) * 1991-10-10 1994-06-28 Hydraulik-Ring Gmbh Hydraulic solenoid valve
DE4317706A1 (en) * 1993-05-27 1994-12-01 Rexroth Mannesmann Gmbh Directional seat valve actuated by external force
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CN202597305U (en) * 2012-04-10 2012-12-12 龚安友 Electromagnetic ball type reversing valve

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109026876A (en) * 2018-08-30 2018-12-18 安徽恒立通液压气动技术有限公司 A kind of two position and four-way reversing valves for emulsion

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Granted publication date: 20150311