4WEH Electrohydraulic Valve

4WEH Hydraulic Directional Valve

3/2,4/2 and 4/3 directional valves,internally pilot operated, externally pilot operated
Sizes 10 to 32
4WEH type
RE 24751/08.08
Replaces:02.03
Component series 6X
Maximum operating pressure 350 bar [5076 psi]
Maximum flow 1100 L/min [290 US gpm]

Features

– Rexroth 4WEH Electro Hydraulic Operated Directional Control Valves can be used to control open &close the direction of fluid flow.

Electro-hydraulic operation (WEH), hydraulic operation (WH)
– WEH Electro Hydraulic Rexroth Valves For sub-plate mounting
– Spring or pressure-centred,spring or hydraulic offset
– Wet-pin DC or AC solenoids, optional
– Electro-Hydraulic Control Valves Manual override, optional
– Electrical connection as individual or central connection
– Shifting time adjustment, optional
– Pre-load valve in P-channel of main valve is optional
– Data sheet with Auxiliary equipment
PDF

4WEH directional valve can be applied on Plastic Injection machine and hydraulic power,working pressure of Pilot Operated Electro-hydraulic Directional Valve is high and flow is large.As you know,common solenoid directional valve flow can not satisfy large flow hydraulic system,the best choice is 4WEH Rexroth directional valve.If you have any question,please email sales@best-hydraulic.com or call us 86-574-87454979,thanks!

Spool Symbols: 2 Spool Positions

1)Only for NG10 and 25 (4WH 22)
If operating pressure > tank pressure, port T must be used as leakage port!
2)Example:
Symbol E with actuating side “a” → ordering code ..EA
3)Spool symbol S for NG16 only

Spool Symbols: 3 Spool Positions

Symbols for Valves with 2 Spool Positions

Symbols for 4WEH Rexroth valves with 2 spool positions

Symbols-for-valves-with-2-spool-positions-2

Symbols for Rexroth 4WEH valves with 3 spool positions

Symbols for valves with 3 spool positions

Free flow cross-sections in zero position with spool Q,V and W

Size	NG	10	16	25 4W.H 22	25 4W.H 25	32
Spool Q A – T;B – T	mm2[inch2]	13[0.02]	32[0.05]	78[0.121]	83[0.129]	78[0.121]
Spool V P – A;P – B	mm2[inch2]	13[0.02]	32[0.05]	73[0.113]	83[0.129]	73[0.113]
Spool V A – T;B – T	mm2[inch2]	13[0.02]	32[0.05]	84[0.13]	83[0.129]	84[0.13]
Spool W A – T;B – T	mm2[inch2]	2.4[0.004]	6[0.009]	10[0.015]	14[0.022]	20[0.031]

Characteristic curves(measured with HLP46,θoil = 40℃±5℃ [104℉ ± 9℉]

At a higher tank pressure the minimum pilot pressure must be raised in accordance with this diagram.

Characteristic curves NG10 (measured with HLP46,θoil = 40℃±5℃ [104℉ ± 9℉])

Characteristic curves: NG16 (measured with HLP46,θoil = 40℃±5℃ [104℉ ± 9℉])

Performance limits: NG16 (measured with HLP46,θoil = 40℃±5℃ [104℉ ± 9℉])

2 positon valves – qv max in Lmin [US gpm]

3 positon valves – qv max in Lmin [US gpm]

Attention!
1)When the specified flow values are exceeded, the function of the return springs can no longer be guaranteed in the event of a pilot pressure failure!
2)With spool V, the pilot valve is not required in the case of flows > 160 L/min [42 US gpm].