4/2 and 4/3 way isolator valve-Type Z4WEH/Z4WH16 ..L5X
Features:
– Directional spool valve, pilot operated
– 2 types of actuation
Electro-hydraulic (type WEH)
Hydraulic (type WH)
– Functions as an isolating/free-flow valve or as an isolating/free-flow short circuit valve
– P and T have free-flow in all switched positions
– Porting pattern to ISO4401-07-07-0-05
– Wet-pin DC or AC voltage solenoids, optional
– Manual override, optional

Function and configuration
Valves of type Z4WEH are directional spool valve with electro-hydraulic actuation. They control the start and stop of a flow.
These directional valves basically consist of the main valve with housing (1), main control spool (2), one or two return springs (3.1 and 3.2), as well as the pilot valve (4).
Main control spool (2) in the main valve is held by the springs in the zero or initial position. In the initial position, the two spring chambers (6) and (7) are connected pressure less to tank via pilot valve (4). The pilot valve is supplied with pilot oil via pilot channel (11).The pilot oil supply can be provided internally or externally (externally via port X in the sandwich plate).
When the pilot valve is operated, e.g. solenoid "a", the pilot spool (not shown on the drawing) is pushed to the left, and consequently spring chamber (7) is pressurized to pilot pressure. Spring chamber (6) remains pressure less.
The pilot pressure acts on the left side of main control spool (2) and pushes it against spring (3.1). As a result of this, the connections on the component side and on the plate side are opened according to the relevant symbols.
When the solenoid is de-energized, the pilot spool returns to the initial position. Pressure chamber (7) is unloaded to the tank.
The pilot oil is drained from spring chamber (7) internally via pilot valve (4) into channel T (Y).
An optional manual override (5) allows the pilot spool to be moved without energization of the solenoid.

Throttle insert
The use of throttle insert (10) is required, if the pilot oil supply in channel P of the pilot valve is to be limited.
Throttle insert (10) is to be installed in channel P of the pilot valve.

1= component side
2= plate side

Pilot oil supply
External: 8 closed Internal: 8 open
9 open 9 closed
Pilot oil port "X" only possible with Z4WEH 16 ... .

Spool symbols
Type Z4WEH ( ① = component side, ② = plate side)
Ordering code Version "ET" Version "T"

Spool symbols
Type Z4WEH ( ① = component side, ② = plate side)
Ordering code Version "ET" Version "T"


Type Z4WH ( ① = component side, ② = plate side)
Ordering code Version "No code" Ordering code Version "No code"


Specification


Technical data

Caution: with electrical connections the protective conductor (PE ) must be connected according to the relevant regulations.

Unit dimensions (dimensions in mm)
Type Z4WEH16

Type Z4WEH10

1 Nameplate of complete valve
2 Nameplate of pilot valve
3 Main valve
4 Port X (G1/4) for external pilot control
5 Pressure reducing valve "D3" (must be used in the case of pilot pressures above 250 bar; only with version "Z4WEH")
6 Switching time adjustment (for throttle check valve); Depending on the installation position, meter-in or meter-out control (illustration: meter- in control)
7 O-ring plate
8 Pilot valve
– Type 4WE 6 J.. for symbol E62
– Type 4WE 6 Y.. for symbol E51, E63, E68
9 Solenoids "a" and "b" (can be rotated 90° )
10 Dimension for valve with manual override "N"; dimensions () for valve with AC solenoid
11 Identical seal rings for ports A, B, P, T (main valve)
12 Identical seal rings for ports A, B, P, T
13 Pilot oil sub plate
14 Space required to remove mating connector
15 Locating pin
16.1 Valve mounting bores
Valve mounting screws (separate order)
4 hexagon socket head cap screws
ISO 4762 - M10 - 10.9
16.2 Valve mounting bores
Valve mounting screws (separate order)
2 hexagon socket head cap screws
ISO 4762 - M6 - 10.9

Stroke adjustment, attachment options (dimensions in mm)

17 Locknut 27 A/F
18 Adjustment spindle, hexagon socket 6 A/F

The stroke adjustment feature limits the stroke of the main spool. The spool stroke can be reduced by loosening locknut (19) and turning adjustment spindle (20) clockwise. The control chamber must be pressure less during this process.
Stroke 10 mm (1 turn = 1.5 mm stroke)

Leeman Paper Co., Ltd.
Stora Enso

Mustad.
Yinzhou Paper Co., Ltd.

Guangxi University
Nanjing Forestry University