Electronic Hydraulic Flow Control Valve , Hydraulic Pilot Control Valve Z4WEH/Z4WH10 ..L4X

4/2 and 4/3 way isolator valve-Type Z4WEH/Z4WH10 ..L4X
Features:
– Directional spool valve, pilot operated
– 2 types of actuation:
Electrohydraulic (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 ISO4401-05-04-0-05
– Wet-pin DC or AC voltage solenoids, optional
– Manual override, optional

Function and configuration
Valves of type Z4WEH are directional spool valves with electro-hydraulic actuation. They control the start and stop of a flow.
These directional valves basically consist of the housing (1), main control spool (2), one or two return springs (3.1 and 3.2), and pilot valve (4).
Main control spool (2) in the main valve is held by the springs in the neutral or initial position. In the initial position, the two spring chambers (6) and (8) are connected to tank via pilot valve (4). The pilot valve is supplied with pilot oil via pilot channel (7). 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", pilot spool (5) is pushed to the left, and consequently spring chamber (8) is pressurized to pilot pressure. Spring chamber (6) remains with no pressure. 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, pilot spool (5) returns to the initial position. Pressure chamber (8) is connected to the tank.
The pilot oil is drained from spring chamber (8) internally via pilot valve (4) into channel T (Y).
An optional manual override (9) allows pilot spool (5) to be moved without energization of the solenoid.

Throttle insert
The use of throttle insert (11) is required, if the pilot oil supply in channel P of the pilot valve is to be limited.
Throttle insert (11) is to be installed in channel P of the pilot valve.

Valves of type Z4WH are directional spool valves with hydraulic actuation. They control the start and stop of a flow.
These directional valves basically consist of valve housing (1), main control spool (2), one or two return springs (3.1) and (3.2) in the case of valves with spring return or spring centering, as well as pilot oil sub plate (10).
Main control spool (2) is operated directly by pressurization.
Main control spool (2) is held by springs in the neutral or initial position. The pilot oil is supplied and drained externally.


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

1) Opening cross-section in spool position "a" (A2 → B2) = 50 mm²
2) Opening cross-section in spool position "b" (A2 → B2) = 35 mm²

Type Z4WEH ( ① = component side, ② = plate side)
Ordering code Version "No code"

1) Opening cross-section in spool position "a" (A2 → B2) = 50 mm²
2) Opening cross-section in spool position "b" (A2 → B2) = 35 mm²

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 Z4WEH10

Type Z4WEH10

1 Nameplate of complete valve
2 Nameplate of pilot valve
3 Main valve
4 Sandwich plate for external pilot control (to be used at operating pressure > 210 bar)
5 Pressure reducing valve "D3" (must be used in the case of pilot pressures above 250 bar; only with version "Z4WEH")
6 Space required to remove mating connector
7 Switching time adjustment (for throttle check valve); Depending on the installation position, meter-in or meter-out control (illustration: meter- in control)
8 R-ring plate
9 Pilot valve
– Type 4WE 6 J.. for symbol E62
– Type 4WE 6 Y.. for symbol E50, E51, E52, E63, E68
Dimensions () for valve with AC solenoid
10 Dimension for valve with manual override "N";
Dimensions () for valve with AC solenoid
11 Solenoids "a" and "b" (can be rotated 90° )
12 Identical seal rings for ports A, B, P, TA and TB
13 Identical seal rings for ports A, B, P and T
14 Pilot oil sub plate
15 Valve mounting bores
Valve mounting screws (separate order)
4 hexagon socket head cap screws
ISO 4762 - M6 - 10.9
16 Valve mounting screws (separate order)
4 hexagon socket head cap screws
ISO 4762 - M5 - 10.9

Stroke adjustment, attachment options (dimensions in mm)

17 Locknut 27 A/F
18 Adjustment spindle, hexagon socket 5 A/F

The stroke adjustment feature limits the stroke of the main spool. The spool stroke can be reduced by loosening locknut (17) and turning adjustment spindle (18) clockwise. The control chamber must be pressure less during this process.
Stroke 6 mm (1 turn = 1 mm stroke)

Leeman Paper Co., Ltd.
Stora Enso

Mustad.
Yinzhou Paper Co., Ltd.

Guangxi University
Nanjing Forestry University