Valve system for preventing uncontrolled descent in fork lift trucks

摘要: A hydraulic lift valve system for fork trucks comprising a three way including spool in bore having first neutral position, second position and third lower position. In the functions to apply fluid from source cylinder lifting of truck only after pressure exceeds load predetermined value as established by poppet valve. Upon shifting permit exhaust therefore lowering is pilot which permits open, thereby insuring that not lowered unless there on fork. By this arrangement, problem uncontrolled descent upon engagement with an object obviated.