(19)
(11) EP 3 997 276 A1

(12)

(43) Date of publication:
18.05.2022 Bulletin 2022/20

(21) Application number: 21827381.1

(22) Date of filing: 31.05.2021
(51) International Patent Classification (IPC): 
E02F 9/22(2006.01)
(52) Cooperative Patent Classification (CPC):
E02F 9/2217; E02F 9/2203; E02F 9/2292; E02F 9/2296
(86) International application number:
PCT/TR2021/050517
(87) International publication number:
WO 2022/005427 (06.01.2022 Gazette 2022/01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME
Designated Validation States:
KH MA MD TN

(30) Priority: 03.07.2020 TR 202010537

(71) Applicant: Hidromek-Hidrolik Ve Mekanik Makina Imalat Sanayi Ve Ticaret Anonim Sirketi
Sincan/Ankara (TR)

(72) Inventor:
  • ÖKMEN, Iskender Atilla
    Sincan/Ankara (TR)

(74) Representative: Yamankaradeniz, Kemal 
Destek Patent, Inc. Maslak Mah., Büyükdere Cad., No: 243, Kat: 13, Spine Tower, Sariyer,
34485 Istanbul
34485 Istanbul (TR)

   


(54) HYDRAULIC SYSTEM PROVIDING ENERGY RECOVERY BY DOUBLE- SPOOL DIRECTION VALVES DURING LOWERING IN LIFTING-LOWERING CYLINDER IN BACKHOE-LOADER, WHEEL LOADER AND EXCAVATOR WORK MACHINES