Directional spool valves, pilot-operated,with hydraulic or electro-hydraulic actuation type WEH and WH
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Directional spool valves, pilot-operated, with hydraulic or electro-hydraulic actuation type WEH and WH ▶▶ ▶▶ ▶▶ ▶▶ Size 10 … 32 Component series 4X; 6X; 7X Maximum operating pressure 350 bar Maximum flow 1100 l/min ▶▶ 4/3-, 4/2- or 3/2-way version ▶▶ Types of actuation (internal or external pilot control): –– Electro-hydraulic (type WEH) –– Hydraulic (type WH) ▶▶ For subplate mounting ▶▶ Porting pattern according to ISO 4401 ▶▶ Spring or pressure centering, spring end position or hydraulic end position ▶▶ Wet-pin DC or AC solenoids, optional ▶▶ Electrical connection as individual or central connection ▶▶ Optional versions: –– Manual override –– Switching time adjustment –– Preload valve in channel P of the main valve –– Stroke setting and/or spool position monitoring Features1 Ordering code 2…4 Symbols 5…9 Function, section 10 … 12 Pilot oil supply 13 … 14 Technical data 15 … 18 Characteristic curves, performance limits 19 … 28 Dimensions 29 … 35 Stroke setting, mounting options 36, 37 Switching time adjustment 38 Pressure reducing valve "D3" 38 Preload valve 39 Proj

2/40 WEH; WH | Directional spool valve Bosch Rexroth AG, RE 24751, edition: 2020-03

Directional spool valve | WEH; WH 3/40 Pst = pilot pressure pst min = minimum pilot pressure PTank = tank pressure Po = cracking pressure RE 24751, edition: 2020-03, Bosch Rexroth AG

1) ► 2 switching positions (hydraulic end position): only symbols C, D, K, Z, Y ► 3 switching positions (hydraulically centered): only NG16, NG25 ("4W.H 25") and NG32 2) With electro-hydraulic actuation only (type WEH) 3) Pilot oil supply X or return Y external: ► The maximum admissible operating parameters of the pilot control valve must be observed (see data sheet 23178). ► Minimum pilot pressure: please observe page 16. ► Maximum pilot pressure: please observe page 16. 4> Pilot oil supply internal (version "ET" and "E"): ► Minimum pilot pressure: please observe page 16. ► Maximum pilot...

Directional spool valve | WEH; WH 5/40 Symbols: 2 spool positions 1 Only for NG10 and 25 ("4W.H 22") with 3/2-way version; if operating pressure > tank pressure, port T is to be used as a leakage port! Ordering code Symbol Control spool return a, X a, X Type of actuation Type WH (hydraulic) Type WEH (electro-hydraulic) a, X aAT b, Y APPT AP PT 33 b 33b RE 24751, edition: 2020-03, Bosch Rexroth AG

WEH; WH | Directional spool valve Symbols: 3 spool positions E1) Example: Symbol E with actuating side "a" → ordering code ..EA.. Ordering code Symbol Actuating side Control spool return Bosch Rexroth AG, RE 24751, edition: 2020-03

Directional spool valve | WEH; WH 7/40 Symbols for valves with 2 spool positions Valve with spring end position Valve with hydraulic end position Type WEH…/…ET… Type WEH…/…E…

WEH; WH | Directional spool valve Symbols for valves with 2 spool positions Valve with spring end position Valve with hydraulic end position Type WEH…/…T… Symbols for valves with 3 spool positions Valve with spring-centered zero position Valve with pressure-centered zero position only NG16, 25 ("W.H 25") and 32 Bosch Rexroth AG, RE 24751, edition: 2020-03 Type WEH…/…E…

Directional spool valve | WEH; WH 9/40 Valve with spring-centered zero position Valve with pressure-centered zero position only NG16, 25 ("W.H 25") and 32 Type WEH . H../...ET... rC c Cl) II >-To c CD C II X Notice: 3-spool position valves, pressure-centered, preferably with external pilot oil supply and/or return ("no code", "E") For preconditions for internal pilot oil supply and/or return ("ET", "T"), see page 4 and 15. RE 24751, edition: 2020-03, Bosch Rexroth AG

WEH; WH | Directional spool valve Function, section: Type WEH 4 Directional valves type WEH… The valve type WEH is a directional spool valve with electro-hydraulic actuation. It controls the start, stop and direction of a flow. The directional valves basically consist of the main valve with housing (1), the main control spool (2), one or two return springs (3.1) and (3.2), as well as the pilot control valve (4) with one or two solenoids "a" (5.1) and/or "b" (5.2). For unobjectionable functioning, the hydraulic system has to be bled properly. For valves with three spool positions, the main...

Directional spool valve | WEH; WH 11/40 Function, section: Type WH 11 1 2 Directional valves type WH… Valve type WH is a directional spool valve with hydraulic actuation. It controls the start, stop and direction of a flow. The directional valve basically consists of the valve housing (1), the main control spool (2), one or two return springs (3.1) and (3.2) at valves with spring return or spring centering as well as the diversion plate (11). The main control spool (2) is actuated directly by pressurization. The main control spool (2) is held in zero or initial position by springs or...

WEH; WH | Directional spool valve Function, section: Type WEH…H 4/3 directional valve with pressure centering of the main control spool, type WEH…H The main control spool (2) in the main valve is kept in the zero position by pressurization of the two front faces. One centering bush (12) rests on the housing and fixes the control spool position. By pressure relief of one front face, the main control spool (2) is moved to the spool position. The unloaded control spool face displaces the returning pilot oil into channel Y (external) via the pilot control valve. Notices: The springs (3.1) and...

Directional spool valve | WEH; WH 13/40 Pilot oil supply (schematic illustration) NG10 2 1 Plug screw M6 according to DIN 906, wrench size 3 – pilot oil return 2 Plug screw M6 according to DIN 906, wrench size 3 – pilot oil supply 3 Plug screw M12 x 1.5 according DIN 906, wrench size 6 – pilot oil supply Pilot oil supply external: 2, 3 closed internal: 2, 3 open Pilot oil return external: 1 closed internal: 1 open Further explanations on page 14. RE 24751, edition: 2020-0