|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||91/29 ; 91/31 ; 91/189R ; 91/517|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 9 인용 특허 : 7|
An improved hydraulic circuit for automatically sequencing a pair of hydraulic cylinders through alternate extension and retraction cycles. A manually operated control valve initiates addition and withdrawal of fluid within the circuit and a logic valve determines which cylinder will be in communication with the control valve. The circuit uses an improved flow restrictor arrangement for creating the pressure drop which automatically shifts the logic valve. The restrictor consists of an orifice, a simple check valve and a constant pressure relief valve, a...
A multifunction valve comprising: a valve body having first and second intersecting bores, said first bore being closed at one end, said second bore being a stepped bore closed at the end of the large diameter section, the step portion providing a valve seat about the periphery of the small diameter section; a valve spool slidably disposed within and engaging the walls of said large diameter bore section, having a valve face for sealingly contacting said valve seat; means for biasing said spool toward said valve seat; a flow limiting orifice passage comm...