公开(公告)号：JPH02217586A

公开(公告)日：1990-08-30

申请号：JP19069989

申请日：1989-07-25

Applicant: TAMPELLA OY AB

Inventor： RAUNO RAYARA ,  YUHA PIITSUPONEN

IPC: E21B19/08 ,  E21B7/02 ,  E21B15/04

Abstract: PURPOSE: To smoothen the operation while reducing the weight of a hose by providing a supply hose and a return hose common to plural actuators, and functioning a cartridge type valve of the remote control as an adjustment valve between each actuator. CONSTITUTION: In order to supply the pressure fluid to plural hydraulic actuators 1, a supply hose 13 and a return hose 9 common to at least two hoses 9, 13 are provided. Both the hoses 9, 13 are divided at appropriate positions, and connected to a required actuator 1, and cartridge type valves 14, 15 of remote control are arranged so as to function as adjustment valves between each actuator 1. Furthermore, over center valves 7, 8 are connected between pressure fluid conduits 5, 6 and the return hose 9. With this structure, number and length of the hose to be required for operation of the plural actuators 1 can be reduced, and the weight of the hose can be reduced.