The VW 22/18 M5-03 valve block for the open circuit has a modular system with five sections plus a pressure release section comprising the basic set-up. Three additional sections can be added on each side of the block, thus specifically addressing customer needs.
Various functions can be selected for the additional sections, which are perfectly designed for the requirements in a wheeled excavator. Options such as boom- or lift- regeneration, anti-drift and return flow bypass are available, as are rod-to-head-regeneration and an innovative float function for the excavator for the first time.
In conventional control valves, the actuator is fixed. In certain applications, it is desired that a cylinder yields to external forces by being able to retract and extend — the so-called floating function. This is particularly important when either increased wear of the attachment on a hard surface or damage to a sensitive surface by the attachment is to be avoided. The control valve is available in two nominal sizes: nominal size 18 with a max. flow rate of 250 l/min and size 22, which allows a max. flow rate of 350 l/min.
