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Machine translation
1. (WO1981001035) ELECTROHYDRAULIC PROPORTIONAL VALVE
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1981/001035    International Application No.:    PCT/US1980/001302
Publication Date: 16.04.1981 International Filing Date: 03.10.1980
IPC:
F15B 13/043 (2006.01)
Applicants:
Inventors:
Priority Data:
82270 05.10.1979 US
Title (EN) ELECTROHYDRAULIC PROPORTIONAL VALVE
(FR) VANNE PROPORTIONNELLE ELECTRO-HYDRAULIQUE
Abstract: front page image
(EN)Electrohydraulic proportional valve comprising an electromagnetic force motor (10), a pilot actuator assembly (12), and a main spool and body assembly (14). The pilot actuator assembly (12) comprises a pilot spool (22) slidably received in a pilot sleeve (24) and a feedback spool (26) which has a camming surface (28) against which the pilot sleeve (24) rides. The camming surface (28) comprises a first portion (36) in which the position of the pilot sleeve (24) is a function of the axial position of the camming surface (28) and a second portion (38) immediately adjacent the first portion (36) in which the position of the pilot sleeve (24) is constant regardless of the axial position of the camming surface (28). The main spool and body assembly (14) comprises a main spool (88) connected to the pilot actuator assembly (12), first and second load holding check valves (120 and 122) slidably disposed in a bore (118), first means for communicating pilot supply pressure to a reduced diameter area (124) on the main spool (88) when it is in the float position, and second means for communicating pilot supply pressure from the reduced diameter area (124) on the main spool (88) to the bore (118) between the first and second load holding check valves (120 and 122) when the main spool (88) is in its float position.
(FR)Vanne proportionnelle electro-hydraulique comprenant un moteur de force electromagnetique (10), un ensemble d'actionnement pilote (12) et un ensemble forment corps et tiroir principal (14). L'ensemble d'actionnement pilote (12) comprend un tiroir pilote (22) recu de maniere coulissante dans un manchon pilote (24) et un tiroir de reaction (26) qui possede une surface de came (28) contre laquelle porte le manchon pilote (24). La surface de came (28) comprend une premiere portion (36) dans laquelle la position du manchon pilote (24) est une fonction de la position axiale de la surface de came (28) et une seconde portion (38) immediatement adjacente a la premiere portion (36) dans laquelle la position du manchon pilote (24) est constante, independamment de la position axiale de la surface de came (28). L'ensemble principal corps et tiroir (14) comprend un tiroir principal (88) connecte a l'ensemble d'actionnement pilote (12), une premiere et une seconde soupape de retenue de charge (120 et 122) coulissant dans un alesage (118), des premiers moyens de communication de la pression d'alimentation pilote vers une zone a diametre reduit (124) sur le tiroir principal (88) lorsqu'il se trouve dans la position flottante, et des seconds moyens de communication de la pression d'alimentation pilote de la zone a diametre reduit (124) sur le tiroir principal (88) vers l'alesage (118) entre la premiere et la seconde soupape de retenue de charge (120 et 122) lorsque le tiroir principal (88) se trouve dans sa position flottante.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)