The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 01, 1985
Filed:
May. 09, 1983
Clifford M Peters, Longview, TX (US);
Joy Manufacturing Company, Pittsburgh, PA (US);
Abstract
A pilot valve adapted for connection between a double acting fluid actuator (12) of the piston-type and a hydraulic fluid supply (21). The pilot valve comprises an elongate body (30) with an axial bore (32, 33) therethrough and a piston chamber (38) at one end of the valve body. A valve plunger (49) affixed to the piston (50) in the piston chamber (38) is mounted in the axial bore for movement between first and second operating positions in response to the selective application of pneumatic pressure to the piston (50). The valve (20) is provided with valve ports (56, 60) for accommodating connections with a hydraulic fluid reservoir (21), and a piston-type actuator (12), respectively, whereby in the first operative position of the valve plunger (49), the valve (20) is conditioned for the transmission of hydraulic fluid to a first side of the actuator piston (17) and the removal to the sump (22) of hydraulic fluid from the other second side of the actuator piston (17) through valve ports (81, 75). In the second operative of the valve plunger (49), the valve is conditioned for the transmission of hydraulic fluid to the second side of the actuator piston (17) through the valve ports (83, 81) and the removal of hydraulic fluid from the first side of the actuator piston (17) to the sump through valve ports (81, 75). In the first operative position, internal passage means (57, 58, 59) in the plunger establish communication between the reservoir (21) and the first side of the actuator piston for transmission of fluid thereto and second internal passage means (77, 78, 79) establish communication between the second side of the actuator and the sump.