Title (en)

HYDRAULIC SYSTEM WITH A HYDRAULIC MOTOR AND A PRESSURE-OHYDRAULIC SYSTEM WITH A HYDRAULIC MOTOR AND A PRESSURE-OPERATED VALVE PERATED VALVE

Publication

EP 0224156 A3 19890426 (DE)

Application

EP 86115882 A 19861115

Priority

US 79905785 A 19851118

Abstract (en)

[origin: US4713936A] A hydraulic motor has its lube drain connected to the motor return line. A motor seal protector valve has a pilot which responds to pressure in the motor return line. Normally, the valve connects system pressure to the motor inlet. High pressure in the return line causes the pilot to move the valve to block the motor feed line and then to connect the motor feed line to sump. In a preferred embodiment, system pressure is connected to the plot to "lock up" the valve in response to return line overpressurization.

IPC 1-7

F15B 13/02; F15B 11/02

IPC 8 full level

F15B 20/00 (2006.01); F15B 11/02 (2006.01)

CPC (source: EP KR US)

F15B 11/02 (2013.01 - EP KR US); F15B 2211/20538 (2013.01 - EP KR US); F15B 2211/30505 (2013.01 - EP KR US); F15B 2211/3111 (2013.01 - EP KR US); F15B 2211/3127 (2013.01 - EP KR US); F15B 2211/3144 (2013.01 - EP KR US); F15B 2211/329 (2013.01 - EP KR US); F15B 2211/40515 (2013.01 - EP KR US); F15B 2211/41572 (2013.01 - EP KR US); F15B 2211/7058 (2013.01 - EP KR US)

Citation (search report)

• [X] US 4520626 A 19850604 - NAKAJIMA KICHIO [JP], et al
• [Y] GB 345203 A 19310304 - CUTTAT SA DES ETS
• [A] US 4218957 A 19800826 - UNDERWOOD HERBERT N [US]
• [A] FR 2280815 A1 19760227 - KLOECKNER HUMBOLDT DEUTZ AG [DE]
• [A] US 4520625 A 19850604 - SATO HIDEYORI [JP], et al

Designated contracting state (EPC)

AT BE CH DE ES FR GB IT LI NL SE

DOCDB simple family (publication)

EP 0224156 A2 19870603; EP 0224156 A3 19890426; AR 247606 A1 19950131; AU 6417286 A 19870521; BR 8605637 A 19870818; CA 1265977 A 19900220; CN 86107785 A 19870527; DK 549386 A 19870519; DK 549386 D0 19861117; JP S62118104 A 19870529; KR 870005190 A 19870605; US 4713936 A 19871222; ZA 868702 B 19880727

DOCDB simple family (application)

EP 86115882 A 19861115; AR 30576186 A 19861031; AU 6417286 A 19861016; BR 8605637 A 19861114; CA 519666 A 19861002; CN 86107785 A 19861114; DK 549386 A 19861117; JP 27084486 A 19861113; KR 860009682 A 19861117; US 79905785 A 19851118; ZA 868702 A 19861117