Function and configurationThe GWEH../6B2..type explosion-proof electro-hydraulic directional valve is a directional valve taking the electro-hydraulic solenoid valve as the pilot control; it applies t...
Product Detail
Function and configuration
The GWEH../6B2..type explosion-proof electro-hydraulic directional valve is a directional valve taking the electro-hydraulic solenoid valve as the pilot control; it applies the plate-type connection, and the connection dimension is in accordance with the DIN 2430 and ISO 4401 standards. There are many different performances and additional devices for choice.
Valves of type GWEH../6B2.. are directional spool valves with electrohydraulic operation, using the directional explosion-resistant valve as pilot control. They control the start, stop and direction of a fluid flow.
The directional valves basically consist of the main explosion-resistant valve with housing (1), main control spool (2), one or two return springs, and the pilot explosion-resistant valve (4) with one or two solenoids.
The main control spool (2) is held in the neutral or in the initial position either by the springs or by means of pressure. Pilot explosion-resistant valve has wet DC or AC solenoids (5), optional. The main control spool is shifted by pilot explosion-resistant valve (4).
There are four patterns on supply and drain of control oil, see the function diagram.
Following are descriptions of various types of valves:
Main valves are spring centered-type 3-position four-way directional valves
The main control spool (2) is held in the neutral position by two return springs (3), and the two spring chambers (6) are connected to the tank via the pilot explosion-resistant valve (4). The pilot oil is supplied via the pilot line (7). When the pilot explosion-resistant valve (4) switches direction(one solenoid of the pilot explosion-resistant valve energizes), the pilot fluid acts on the one end of the main spool (2) and pushes it (2) to move and the required port is connected, thus the flow direction of the fluid is changed.
When the solenoid is de-energized, the pilot spool returns to its initial position (exception: impulse valve). The spring chambers (6) are connected to tank by pilot explosion-resistant valve (4). Under the force of spring, the spool returns to its neutral position. The oil in the spring chamber (6) flows to return line from external port Y or internal line T via the pilot valve (4).
Function and configuration
2-position four-way directional valves
(this kind of valve has four different structures and Types)
Type G4WEH.../6B2...
This kind of pilot valve and main valve have a reset spring each, resetting by spring force.
Type G4WEH...H.../6B2...
This kind of valve has a reset spring, making pilot valve spool stay in initial position. Main valve spools change directions under effect of pressure oil.
Type G4WEH...H.../O6B2...
This kind of valve has two solenoids. There are no reset springs in pilot valves and main valves, thus using solenoids and pressure oil to make pilot valves and main valve spools change directions. Therefore, at least one solenoid shall be under working state.
Type G4WEH...H.../OF6B2...
This kind of valve has two solenoids and locators which makes pilot valve spools stay in working position(impulse valves). Main valve spools have no locating devices, moving downward to corresponding working positions under effect of pressure oil.
Structure 2, 3 and 4 preceding are hydraulic reset. Main valve spools can stay in the working position only under the effect of pressure oil.
Function and configuration
Function and configuration
Switching time adjustment:
In order to influence the switching time of the main valve a double throttle check valve has to be fitted between pilot valves and main valves to control oil supply from pilot valves into main valve spools, thus adjusting the switching time of main valves.
Regulating bolt rotation clockwise, the time for switching of main valves is long, otherwise the time is short.
The throttle check valve has two kinds: meter-in throttling and meter-out throttling. If there is a need of changing meter-in throttling into meter-out throttling, just install the valve after rotating 180° around the longitudinal axis again and then install pilot valves.
Pressure reducing valves:
The pressure reducing valve (8) must be used if the pilot pressure is higher than 250 bar.
Pressure reducing ratio of constant-ratio pressure reducing valves(D1) 1:0.66.
Pressure reducing pressure of constant-ratio pressure reducing valves shall not exceed 40 bar.
Minimum control pressure of technical Ordering code shall improve 1/0.66=1.515 after installing bottom plate pressure reducing valves.
Constant-ratio pressure reducing valves shall not be used when controlling internal oil drain and using back pressure valves(P0.45) with control pressure decreased to 3 bar.
Function and configuration
Back pressure valve:
Valves controlling oil inner supply with unloading passages, such as C, Z, G, H, P, S, T and V, In valves with zero pressure circulation and internal pilot oil supply,
a back pressure valve (19) must be installed in the P-channel of the main valve to build up the minimum pilot pressure. The pressure differential of the back pressure valve must be added to the pressure differential of the main valve (see characteristic curves) in order to determine the actual value. The opening pressure of this valve is approx. 4.5 bar.
NG10 valves do not have back pressure valves.
Ordering code
Note:
1、When the spools of type GWEH10../6B2.. is C, Z, F, G, H, P, T ,V and so on, if the pilot oil is internal supply, the pilot oil should be external drain. And enough back pressure should be exerted on the return oil port T (must not be on the Port Y) so that the valve can change directions reliably.
2、When the pilot pressure is higher than 250 bar (It will be main pressure when the version is supply internal), the pressure reducing valve must be used.
3、G1 Explosion protection grade EX d Ⅰ Mb; G2 Explosion protection grade EX d Ⅱ C T4 Gb
Ordering code
Note:
1.For function of GWEH16-25 such as C, Z, F, G, H, P, T, V, etc, if applying control oil internal supply, please try to use external drain, add enough back pressure on return port T (port Y shall not have back pressure) to ensure valves can reverse properly.
2.Pressure reducing valves shall be applied when control pressure exceeds 250 bar.
3.G1 Explosion protection grade EX d Ⅰ Mb; G2 Explosion protection grade EX d Ⅱ C T4 Gb
Symbols
Symbols
Symbols
Technical details
1.Hydraulic section
1). GWEH10../6B2.. Type explosion-proof electro-hydraulic directional valve
| Maximum working pressure: bar | 315 | ||||||||||
| Port T | With external pilot oil drain bar | 315 | |||||||||
| With internal pilot oil drain bar | 210 | ||||||||||
| Port Y | With external pilot oil drain bar | 210 | |||||||||
| Min. control | With external pilot oil supply bar | 3-position valve 10 | |||||||||
| Spring-return 2-position valve 10 | |||||||||||
| Hydraulic-return 2-position valve 7 | |||||||||||
| Control oil internal supply bar | 4.5 | ||||||||||
| Max. control pressure bar | 250 | ||||||||||
| Hydraulic fluid | Mineral oil, phosphate oil | ||||||||||
| Temperature range of Hydraulic fluid ℃ | -30 to+80 (NBR seals) | ||||||||||
| -20 to+80 (FKM seals) | |||||||||||
| Viscosity range m㎡/s | 2.8 to 500 | ||||||||||
| Controlled quantity in cm3 | 3-position valve 2.04 | ||||||||||
| 2-position valve 4.08 | |||||||||||
| Total commutating time of valve from zero position to switching position (DC) | |||||||||||
| Control pressur bar | 70 | 140 | 210 | 250 | |||||||
| -3-position valve ms | 65 | 60 | 55 | 50 | |||||||
| -2-position valve ms | 80 | 75 | 70 | 65 | |||||||
| Total Switching time of valve from switching position to zero position | |||||||||||
| -3-position valve ms | 30 | ||||||||||
| - 2-position valve ms | 35 | 40 | 30 | 35 | 25 | 30 | 20 | 25 | |||
| Flow of shorter Switching time L/min | About 35 | ||||||||||
| Installation position | HC,HD, HK, HZ and HY of hydraulic | ||||||||||
| Weight | Single solenoid valve | kg | 7.8 | ||||||||
| Double solenoid valve | kg | 9.1 | |||||||||
| Switching time regulator | kg | 1.0 | |||||||||
| Fixed ratio pressure reducing valve | kg | 0.5 | |||||||||
Technical details
1.Hydraulic section
2). GWEH16../6B2.. Type explosion-proof electro-hydraulic directional valve
| Maximum working pressure: bar P,A,B | Type G-...WEH16../6B2... | |||
| 350 | ||||
| Port T | With external pilot oil drain bar | 250 | ||
| With internal pilot oil drain bar | 210 | |||
| Port Y | With external pilot oil drain bar | 210 | ||
| Min. control pressure | bar With external pilot oil supply bar With internal pilot oil supply bar | 3-position valve 14 | ||
| Spring-return 2-position valve 14 | ||||
| Hydraulic-return 2-position valve 14 | ||||
| With internal pilot oil supply bar | When applying back pressure valve or the flow is large, enginery of spool valve is 4.5 bar as C,Z,F,G,H,P,S,T and V | |||
| Max. control pressure bar | 250 | |||
| Hydraulic fluid | Mineral oil, phosphate oil | |||
| Temperature range of Hydraulic fluid ℃ | -30 to +80(NBR seals) | |||
| -20 to + 80(FKM seals) | ||||
| Viscosity range m㎡/s | 2.8 to 500 | |||
| cm3 Switching pilot oil volume cm3 | Spring-centering 3-position valve 5.72 | |||
| 2-position valve 11.45 | ||||
| *Switching time from '0' position to working position ( | DC solenoid) | |||
| Control pressur bar | 50 | 150 | 250 | |
| -Spring-centering 3-position valve ms | 65 | 60 | 58 | |
| -2-position valve ms | 65 | 55 | 50 | |
| *Switching time from working position to "0" position | ||||
| -Spring-centering 3-position valve ms | 30 | |||
| -2-position valve ms | 45 | 35 | 30 | |
| Installation position | C,D,K,Z,Y Type hydraulic-return valves are installed horizontally, the rest can be installed arbitrarily | |||
| Flow of shorter switching time L/min | About 35 | |||
| Weight of the valve kg | About 10.6 | |||
*Switching time refers to time from drawing of solenoid of pilot valve to full opening of main valve.
Technical details
1.Hydraulic section
3). GWEH25../6B2.. Type explosion-proof electro-hydraulic directional valve
| Maximum working pressure: bar P,A,B | Type G-H-...WEH25../6B2... | ||||
| 350 | |||||
| Port T | With external pilot oil drain bar | 250 | |||
| With internal pilot oil drain bar | 210 | ||||
| Port Y | With external pilot oil drain bar | 210 | |||
| Min.control pressure | With external pilot oil supply bar With internal pilot oil supply | Spring-centering 3-position valve 13 | |||
| Spring-return 2-position valve 13 | |||||
| Hydraulic-return 2-position valve 8 | |||||
| With internal pilot oil supply bar | When applying prepressing or the flow is large correspondingly ,enginery of spool valve is 4.5 bar as C,Z,F,G,H,P,S,Tand V | ||||
| Max. control pressure bar | 250 | ||||
| Hydraulic fluid | Mineral oil, phosphate oil | ||||
| Temperature range of Hydraulic fluid ℃ | -30 to + 80(NBR seals) | ||||
| -20 to +80(FKM seals) | |||||
| Switching pilot oil volume cm3 3 cm | Spring-centering 3-position valve 14.2 | ||||
| 2-position valve 28.4 | |||||
| *Switching time from '0' position to working position ( DC so | lenoid) | ||||
| Pilot control pressure bar | 50 | 140 | 210 | 250 | |
| - Spring-centering 3-position valve ms | 85 | 75 | 70 | 65 | |
| - 2-position valve ms | 160 | 130 | 120 | 105 | |
| *Switching time from working position to "0" position | |||||
| -Spring-centering 3-position valve ms | 40 | ||||
| -2-position valve ms | 125 | 100 | 90 | 80 | |
| Installation position | C,D,K,Z,Y Type hydraulic-return valves are installed horizontally, the rest can be installed arbitrarily | ||||
| Flow of shorter switching time L/min | About 35 | ||||
| Weight of the valve kg | About 19 | ||||
*Switching time refers to time from drawing of solenoid of pilot valve to full opening of main valve.
Technical details
2. Electrical data
| Type of voltage | DC |
| Voltage (allowable fluctuation of ±10%) | 12、24V、36V、110V |
| Power W | 30 |
| Duty cycle | Continuous |
| Temperature range of environment ℃ | ~+50 |
| Temperature range of coil ℃ | ~+150 |
| Protection class to DIN40050 | IP65 |
Characteristic curves (Measured at 8oil =40°C +5°C, using HLP46)
Characteristic curves(Measured at oil =40°C +5°C, using HLP46)
When valve is at the middle position, open area of all flow directions.
| Size | Enginery | Open area(m㎡) | |||
| P→A | P→B | A→T | B→T | ||
| GWEH 10../6B2.. | Q | - | - | 13 | 13 |
| V | 13 | 13 | 13 | 13 | |
| W | - | - | 2.4 | 2.4 | |
| GWEH 16../6B2.. | Q | - | - | 32 | 32 |
| V | 32 | 32 | 32 | 32 | |
| W | - | - | 6 | 6 | |
| GWEH 25../6B2.. | Q | - | - | 83 | 83 |
| V | 83 | 83 | 83 | 83 | |
| W | - | - | 14 | 14 | |
Performance limit
The switching function of valves depends on filtration due to adhesive effects. To achieve the specified permissible flow values, we recommend full-flow filtration with 25 µm. The flow forces acting within the valves also have an influence on the flow performance. With 4-way directional valves, the specified flow data are therefore valid for normal applications with 2 directions of flow
(e.g. from P to A and simultaneous return flow from B to T) (see table).
If the fluid flows in only one direction, the permissible flow may be significantly lower in critical cases (e.g. use of a 4-way directional as 3-way directional valve with port A or B blocked).
Enginery limit table of GWEH 10../6B2.. Type electro-hydraulic directional control valve
| 3-position valve, spring centering | |||
| Flow(L/min) | Pressure stage(bar) | ||
| Symbol | 200 | 250 | 315 |
| E,J,L,M,Q, U,W,R,V | 160 | ||
| H | 160 | 150 | 120 |
| G,T | 160 | 140 | |
| F,P | 160 | 140 | 120 |
| 2-position valve whose main valve has a returning spring | |||
| C,D,K,Z,Y | 160 | ||
| 2-position valve, main valve without spring | |||
| Flow(L/min) | Pressure stage(bar) | ||
| Symbol | 200 | 250 | 315 |
| HC HD HK HZ HY | 160 | ||
| HC.../O HD.../O | 160 | ||
| HK.../O HZ.../O | |||
| HC.../OF... HD.../OF... HK.../OF... HZ.../OF... | 160 | ||
Enginery limit table of GWEH 16../6B2.. Type electro-hydraulic directional control valve
| Spring-centering 3-position valve | 2-position valve | ||||||||||
| Flow(L/min) | Pressure stage(bar) | Flow(L/min) | Pressure stage(bar) | ||||||||
| Symbol | 70 | 140 | 210 | 280 | 350 | Symbol | 70 | 140 | 210 | 280 | 350 |
| E,H,J,L,M, Q,U,W,R | 300 | 300 | 300 | 300 | 300 | C | 300 | 300 | 300 | 300 | 300 |
| D,Y | 300 | 270 | 260 | 250 | 230 | ||||||
| F,P | 300 | 250 | 180 | 170 | 150 | K | 300 | 250 | 240 | 230 | 210 |
| G,T | 300 | 300 | 240 | 210 | 190 | Z | 300 | 260 | 190 | 180 | 160 |
| S | 300 | 300 | 300 | 250 | 220 | Hydraulic-return 2 | -position valve | ||||
| V | 300 | 250 | 210 | 200 | 180 | HC,HD,HK,HZ,HY | 300 | 300 | 300 | 300 | 300 |
| When control oil is supplied internally and pressure valve is equipped, the flow of spool valve's enginery of H, F, P,G,T, S, V,C and Z Types reaches 160L/min. | |||||||||||
Performance limits
Enginery limit table of GWEH 25../6B2.. Type electro-hydraulic directional control valve
| 3-position valve of spring centering | 2-position valve | ||||||||||
| Flow(L/min) | Pressure stage(bar) | Flow(L/min) | Pressu re stage(bar) | ||||||||
| Symbol | 70 | 140 | 210 | 280 | 350 | Symbol | 70 | 140 | 210 | 280 | 350 |
| E,L,M | 650 | 650 | 650 | 650 | 650 | G,D,K,Z,Y | 650 | 650 | 650 | 650 | 650 |
| U,W,Q | Hydraulic-return 2-position valve ( main valve without spring) | ||||||||||
| G,T | 400 | 400 | 400 | 400 | 400 | HC HD HK HZ HY | 650 | 650 | 650 | 650 | 650 |
| F | 650 | 550 | 430 | 330 | 300 | ||||||
| H | 650 | 650 | 550 | 400 | 360 | HC.../O | 650 | 650 | 650 | 650 | 650 |
| J | 650 | 650 | 650 | 600 | 520 | HD.../O | |||||
| P | 650 | 550 | 430 | 330 | 300 | HK.../O | |||||
| V | 650 | 550 | 400 | 350 | 310 | HZ.../O | |||||
| R | 650 | 650 | 650 | 650 | 580 | HC.../OF... | 650 | 650 | 650 | 650 | 650 |
| HD.../OF... | |||||||||||
| HK.../OF... | |||||||||||
| HZ.../OF... | |||||||||||
| When control oil is supplied internally and pressure valve is equipped, the flow of spool valve's enginery of G, Z,V, F,H,P,T Types reaches 180L/min. | |||||||||||
Pilot-operated solenoid valve
A four-way Explosion protection directional valve with NG 6 (G4WE6../B2..) is used as the pilot valve. The slide valve is kept in the middle or the initial position by the spring, and kept on the working position through the solenoid or the locator.
The valve applies the DC solenoid, and the function of the pilot solenoid valve applied to the main valve with various functions is shown as the table below:
| Main valve | Pilot-operated solenoid valve |
| Spring-centering 3-position valve/ transformed 2-position valve | Use G4WE6J-6X/B2...3-position valve/ |
| Structure of 2-position main valve: Y.../...and HY.../... B.../...and HB.../... | Use G4WE6J-6X/B2...2-position valve |
| 2-position valve: A, C,D, K and Z Type functions HA,HC, HD, HK, HZ Type valves | Use 2-position valve with D Type enginery Types of main valve's structure: Spring return G4WE6D-6X/B2... No returning spring G4WE6D-6X/OB2... No returning spring, with a positioner G4WE6D-6X/OFB2... |
Unit dimensions
Unit dimension of valve type GWEH10../6B2..
Unit dimensions
Unit dimension of valve type GWEH16../6B2..
Unit dimensions
Unit dimension of valve type GWEH25../6B2..
