Description
The flow control valves series “A-VRFC3C-VEI-VS” are 3 way, with one inlet “P” and two outlets “A” and “B”, the first outlet “A” being priority, pressure compensated type, with pressure relief valve and available on demand through a solenoid cartridge; the second outlet “B” is the by-pass for all flow in excess of what demanded by priority. Both flows from “A” and “B” ports can be employed to power different functions of the machine. A pressure signal “LS” from the valve is delivered to the load sensing circuit to increase the pump flow in order to match the requirement. These valves provide a simple and efficient way to power hydraulic tools (such as hydraulic hammers) from the existing hydraulic system, without any need to modify the directional control valve. They allow the simultaneous operations, independently from the respective working pressures, of both the hydraulic actuator powered by the priority outlet “A”, and of the normal functions of the machine (traction, slewing, cylinder motions, etc.) supplied by the main directional valve through the by-pass outlet “B”.