Page 36 - Linde - VT1 Modular, modular system for LSC manifold valve plates

4 | System components. Directional control valves variants. Distinction

Directional control valve with standard function type A — asymmetric function
Directional control valve types
The following directional control valves are available:
>> 25ZY VW25-CF25 for NG25 functions with cylinder function
>> 25N VW25-CF25 for NG25 functions with tilt function
>> 30ZY VW30-CF25 for NG30 functions with cylinder function
>> 30A VW30-CF25 for NG30 functions with cylinder function

These directional control valves are normally used for the actuation of cylinders with differential areas. They have an asymmetric
flow distribution between ports A and B and a simple load holding function. In the zero position, all ports are blocked. In addition,
in both function ports, there is a pressure relief valve with anti-cavitation function.

>> Hydraulic actuation (pilot pressure max. 32 bar) is realized with the ports provided on the covers of the VW directional
control valves. Hydraulic opening begins at 7.5 ±0.5 bar (pump-to-function). *
>> Electro-hydraulic actuation is realized with the electro-proportional pressure reducing valves. Electro-hydraulic opening
beings at I= 430 ±10mA. *
>> The necessary pilot pressure (max. 32 bar) comes from the Pst port on the VT1EE.
* A volume of approx. 1 l/min flows from the pump to the function

Each directional control valve is configured with the following characteristics:

>> Flow characteristic of the valve spool
>> Other responses: see replacement parts.

Directional flow A / B DBV NLV
control valve at DpLS=20 bar in bar
25ZY 420 / 330 380 -
25N 350/ 200 380 -
30ZY 620 / 320 380 -
30A 640 / 440 380 -

circuit diagram

VW25-CF25 with DBV VW30-CF25 with DBV

36