EP 0041247 A3 19820526 - PILOT-OPERATED DEVICE FOR LOAD-INDEPENDENT FLOW CONTROL
Title (en)
PILOT-OPERATED DEVICE FOR LOAD-INDEPENDENT FLOW CONTROL
Publication
Application
Priority
DE 3020918 A 19800603
Abstract (en)
[origin: EP0041247A2] 1. Pilot-operated device for load-independent flow control comprising a main control valve (6-13) which controls the fluid flow between an inlet (4) and an outlet (5), a pilot valve (25-27) which acts upon a control flow branched off the fluid flow for actuating the main control valve, an activating device (35) which acts upon the valve body (25) of the pilot valve with a force being proportional to an input signal, and a fluid flow sensor (17-23) which is positioned in the flow path between the inlet (4) and the outlet (5) and is designed as a spring-biased seated valve opening in dependency on the differential pressure, the position of the valve body of said fluid flow sensor being fed back by a spring (24) against the force of the activating device (35) to the valve body (25) of the pilot valve, characterized in that the main control valve (6-13) is designed as a seated valve, the valve body (7) of which is impinged in the opening direction by a pressure prevailing in the flow path and in the closing direction by the force of a spring (11) and by the control pressure controlled by the pilot valve (25-27), that the valve body of the pilot valve (25-27) is designed as a pilot piston (25), that the main control valve (6-13), the pilot valve (25-27) and the fluid flow sensor (17-23) are arranged in a common housing (1), with the valve body (18) of the fluid flow sensor and the pilot piston (25) being displaceable coaxially with respect to each other in aligned bores (16, 17; 26), and that the activating device (35) is arranged coaxially with respect to the pilot piston (25) and acts upon said pilot piston (25) through a coaxial transmitting element (37).
IPC 1-7
IPC 8 full level
F15B 11/05 (2006.01); F15B 13/04 (2006.01); F15B 13/043 (2006.01)
CPC (source: EP)
F15B 9/03 (2013.01); F15B 13/0435 (2013.01)
Citation (search report)
- DE 2139119 A1 19730215 - HERION WERKE KG
- DE 2506923 A1 19760902 - HEILMEIER & WEINLEIN
- US 3044480 A 19620717 - SHIH-YING LEE
- EP 0023416 A2 19810204 - SPERRY LTD [GB]
- DE 2428287 A1 19750116 - BERINGER HYDRAULIK GMBH
- DE 2439030 A1 19750327 - SANDERS ASSOCIATES INC
- EP 0002446 A1 19790627 - REXROTH MANNESMANN GMBH [DE]
- DE 2149915 A1 19720427 - ITE IMPERIAL CORP
- Olhydraulik und Pneumatik, Band 20, Oktober 1976 Mainz (DE) R. BARTHOLOMAUS: "Neue Proportionalventile aus Standardbauelementen", seiten 667-669 * abschnitt 4; abbildung 10 *
- Automatik, Band 15, Juni 1970, Heidelberg (DE) B. DAHM: "Hydraulische Stellglieder und Servomechanismen in Steuerungen und Regelungen (III)" seiten 208-216 * seite 210, rechte spalte, zeile 32 - seite 211, linke spalte, zeile 8; abbildung 22 *
Designated contracting state (EPC)
CH DE FR GB
DOCDB simple family (publication)
EP 0041247 A2 19811209; EP 0041247 A3 19820526; EP 0041247 B1 19851113; DE 3020918 A1 19811210; DE 3172883 D1 19851219
DOCDB simple family (application)
EP 81104114 A 19810529; DE 3020918 A 19800603; DE 3172883 T 19810529