Rocon Product List Water Control Valve Water Control Valve (WCV) prevents leaks and defective welds in the resistance welding process. Deltapoint® Deltapoint® detects a leak, an alarm is sent to the robot to stop welding and the water is shutoff. Deltapoint JR® Deltapoint JR® detects tip loss in a resistance welding cell. Delta Point Uno Delta Point Uno is a flowmeter made for water.