The forklift arm is raised and lowered using a proportional directional seated valve in the lifting module. This valve can move loads with high precision at flow rates to 160 lpm (42.3 gpm). Because it is leak-free when closed, it reliably maintains pressure to securely hold loads. Lifting and lowering can be accomplished with either discrete or proportional control.
The HMPL module is designed for maximum operating pressures of 315 bar (4570 psig). It is available for variable- displacement pump systems and fixed-displacement pump systems with integrated idle circulation.
Getting the drop on lowering
HAWE also introduced a new proportional flow control valve as a space-saving alternative for load-neutral hydraulic controls. In the past, a flow controller and an electronic proportional valve had to be used for this application. Now, HAWE’s type EMC valve can be used to replace both with a single valve. Doing so saves valuable installation space for manufacturers of forklifts, lifting platforms, and similar applications.
With this valve, the drop rate of forklifts and lifting platforms remains the same at constant volume flow regardless of the load. The valve’s cone seated design provides zero leakage in the closed position to maintain pressure, which helps manufacturers comply with safety standard defined by ISO 3691.1.