4-way 3-position, 4-way 2-position and 3-way 2-position directional
valve with mechanical, manual operation
Type WHD,WN,WP10...L3X
Features
- Direct operated directional spool valve
- Types of actuation:
• Pneumatic (WP, WPZ)
• Hydraulic (WH, WHZ)
- Sub-plate mounting
- Porting pattern to DIN 24 340 Form A, and ISO 4401
Function
Valves of type WP and WH are directional spool valves with fluid
logics actuation. They control the start, stop and direction of a
flow.
The directional valves basically consist of housing (1), one or two
actuation elements (2) (hydraulic, pneumatic actuation cylinder),
one or two return springs (3) and control piston (4).
Type WHD.../
In the initial state, the main spool(2) remain in the intermediary
civilian under the action of two return springs(3), into the
external model oil through the a port into the oil to promote the
left of the piston(4) to the right, remove the
signal Oil, the main spool(2) back to the middle position under the
right spring force back to the middle position. If external oil
from the b port, the oil push the right side of the piston (4)
left, thus driving the main spool (2) left, remove the signal oil,
the main spool (2) back to the middle position under the left
spring force.
Without spring return, Type ..O/..
(Only for Spool Symbol A,C,D)
If using actuation elements without return springs and without
detent, a defined spool position is not given in the de-energized
condition.
Without spring return with detent,
Type ..OF/.. (Only for Spool Symbol A,C,D)
Directional valves with hydraulic or pneumatic actuation are also
available as 2-spool position valve with detent. If using actuation
elements with detent, every spool position can be locked.
Cartridge throttle
The use of a throttle insert is required when due to prevailing
operating conditions, flows can occur during the switching
processes, which exceed the performance limit of the valve. It is
inserted in channel P of the directional valve.
Specifications
Symbols
Technical data
| Valve type | WN | WP | WHD |
| Weight 1 operating cylinder | kg | 3 | 3 | 3 |
| 2 operating cylinder | kg | 3.3 | 3.3 | 3.3 |
| Fluid temperature range | ℃ | -30 to +80 (NBR seal) |
| -20 to +80 (FKM seal) |
| Max.operating pressure | Port A,B,P | bar | 315 |
| Port T | bar | 160 |
| Max. flow-rate | L/min | 120 |
| Flow cross section (switching neutral position) | Type V | mm2 | For type V 11(A/B to T) 10.3(P to A/B) |
| Type W | mm2 | For type W 2.5(A/B to T) |
| Type Q | mm2 | For type Q 5.5(A/B to T) |
| Control pressure | bar | 1.5～0.6 | 4.5～120 | 50～160 |
| Fluid | Mineral oil, Phosphate ester |
| Viscosity range | mm2/s | 2.8 to 500 |
| Degree of contamination | Maximum permissible degree of fluid contamination: Class 9. NAS
1638 or 20/18/15, ISO4406 |
Unit dimensions (WHD) (Dimensions in mm)
1 Used for 3-postition valve or,
2-postition */O, */OF
2 Used for 2-postition valve B, Y, EB...
3 Name plate
4 2-postition valve A, C, D, EA...
5 Valve with a actuator (2-position valve)
6 O-ring 12×2 , with ports A, B, P, T
7 Port TB used for special manifold
Valve mounting screws:
Internal hexagon screw
M6×40 GB/T 70.1-10.9,
Tightening torque MA =15.5Nm
It must be ordered separately, if connection plate is needed. Type:
G 66/01 (G 3/8), G 66/02(M18×1.5)
G 67/01 (G 1/2), G 67/02(M22×1.5)
G 534/01 (G 3/4), G 534/02(M27×2)
Unit dimensions (WN, WP) (Dimensions in mm)
1 2-position valves
symbols B, Y, EB...
2 2-position valves
symbols A, C, D, EA...
3 3-position valves
4 Cover for valves with one operating element
(2-position valve)
5 Name plate
6 O-ring 12×2
7 The additional T connection (TB) can also be optionally used in
special manifold blocks.
8 Porting pattern
9 Pilot port
Valve mounting screws:
Internal hexagon screw, M6×40 GB/T 70.1-10.9,
Tightening torque, MA =15.5Nm
It must be ordered separately, if connection plate is needed. Type:
G 66/01 (G 3/8), G 66/02(M18×1.5)
G 67/01 (G 1/2), G 67/02(M22×1.5)
G 534/01 (G 3/4), G 534/02(M27×2)
