Plug valve VBCL series

hydraulicfor controlpilot

SINGLE COUNTERBALANCE VALVE FOR OPEN CENTER VBCL OVERCENTER VALVE SIMPLE EFFECT NOT COMPENSATED FOR IN-LINE INSTALLATION With the Oleoweb VBCL counterbalance valves it is possible to support a suspended load and control its movement by eliminating vibrations or too fast and dangerous lowering. Equipped with a valve body with BSPP-GAS threaded ports, the VBCL overcenter valves are designed to be installed in-line within the hydraulic system in compliance with the spaces available on the machine. The single overcenter valves of the VBCL series are designed to ensure the stability in the working position of a hydraulic actuator with suspended load, and to control its movement in only one direction (usually the descent phase), leaving the opposite side powered by free flow; thanks to the BSPP-GAS threaded ports, it can be installed in-line into the hydraulic system. By feeding the line opposite the load, the pilot line manages the partial opening of the descent channel allowing control of the actuator movement and avoiding the phenomenon of cavitation thanks to the action of contrasting the gravitational force. A calibrated hole dampens the pilot signal so that the valve opens and closes proportionally, avoiding load oscillations. The VBCL single overcenter valve also works as an antishock valve in the presence of pressure peaks caused by impacts or excessive loads. For this to be possible, the return line on the distributor must be connected to the drain. The VBCL is a not-compensated valve: any residual pressures on the return line counteract the opening of the valve and rises its setting and piloting values.