Title:
PILOT DIRECTIONAL CONTROL VALVE
Document Type and Number:
Japanese Patent JP3169257
Kind Code:
B2
Abstract:
PURPOSE: To provide a pilot directional control valve capable of controlling differential pressure of pilot pressure supplied to each pilot port of a control valve by one single valve and with favorable responsiveness for a command from outside.
CONSTITUTION: This pilot directional control valve is constituted of a linear motor 15 with a rod 2 working by an input electric current to a coil 9 and a valve body 16 integrally connected by the rod 2 and a screw 12 and furnished with a spool 3 having a pressure system to receive pressure of control ports 43a, 43b on lands 3a, 3b. By balancing driving force of the linear motor 15 and pressing force of the spool 3, differential pressure between the control port 43a and the control port 43b is controlled.
Inventors:
Ken Ichiyanagi
Morio Oshina
Morio Oshina
Application Number:
JP9798392A
Publication Date:
May 21, 2001
Filing Date:
April 17, 1992
Export Citation:
Assignee:
Hitachi Construction Machinery Co., Ltd.
International Classes:
F15B13/044; (IPC1-7): F15B13/044
Domestic Patent References:
| JP5683606A | ||||
| JP2113103A | ||||
| JP183902U | ||||
| JP62155202U |
Attorney, Agent or Firm:
Kenjiro Take