Function and configurationsDirectional valves type WMD... are mechanical, manual operated directional spool valves. They control the start, stop and direction of a flow.The rotary knob ( 2 ) operates ...
Product Detail
Function and configurations
Directional valves type WMD... are mechanical, manual operated directional spool valves. They control the start, stop and direction of a flow.
The rotary knob ( 2 ) operates ( 2×90 ° ) the spool( 1 ), the screw type rotation transforms into axial movement and direct acts on the spool(1). Then the spool ( 1 ) moves to the end position and gets the opening position as required.
Actual switch position of spool (1) can be controlled with rotary knob ( 2 ). All the switch positions can be orientated by locating device.
Cartridge throttle
The use of a throttle insert is required, when operating, flows can occur during the switching processes that exceed the performance limit of the valve.
These throttles are to be inserted into the P-channel of the directional valve.
Ordering code
Symbols
Technical data
| 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 m㎡ | for symbol V11(A/B to T) 10.3( P to A/B) |
| Type W m㎡ | for symbol W 2.5(A/B to T) | |
| Type Q m㎡ | for symbol Q 5.5(A/B to T) | |
| Fluid | Mineral oil, Phosphate ester | |
| Viscosity range m㎡/s | 2.8 to 500 | |
| Degree of contamination | Maximum permissible degree of fluid contamination: Class 9. NAS 1638 or 20/18/15, ISO4406 | |
| Weight kg | 4.2 | |
Characteristic curves (Measured at θoil=40℃±5℃, using HLPH)
8 Symbols "G" and "T" in mid position(P → T)
8 Symbol "R" in position b (A → B)
| Spool symbol | Flow direction | |||
| P toA | Pto B | Ato T | B to T | |
| A | 4 | 3 | - | - |
| B | 3 | 4 | - | - |
| C | 3 | 3 | 4 | 4 |
| D | 3 | 3 | 5 | 5 |
| E | 2 | 2 | 4 | 4 |
| F | 1 | 2 | 3 | 4 |
| G,T | 4 | 4 | 7 | 7 |
| H | 1 | 1 | 5 | 5 |
| J | 2 | 2 | 3 | 3 |
| L | 3 | 3 | 2 | 4 |
| M | 1 | 1 | 4 | 4 |
| P | 3 | 1 | 5 | 5 |
| Q | 2 | 2 | 2 | 2 |
| R | 3 | 4 | 3 | - |
| U | 3 | 3 | 5 | 2 |
| V | 2 | 2 | 3 | 3 |
| W | 3 | 3 | 3 | 3 |
| Y | 4 | 4 | 6 | 6 |
Operating limitation
The switching performance of the valves depends on the filtration. In order to achieve the specified admissible flow values, we recommend full flow filtration with 25 µm. The flow forces acting within the valves also affect the flow performance. With 4 way valves the specified flow data thus apply to normal operation with 2 volume flow directions (e.g. from P to A and at the same time return flow from B to T) (see table).
If only one flow direction is available, in certain cases, the admissible flow can be significantly smaller (e.g. when using a 4 way valve as 3 way valve, due to blocked connection A or B).
Unit dimensions
