Title:
BACK PRESSURE VALVE
Document Type and Number:
Japanese Patent JPH0742857
Kind Code:
A
Abstract:
PURPOSE: To improve efficiency and enhance operational speed of a high oil pressure apparatus by suppressing to a low level, a quantity of pressure oil returned to an oil tank through a pilot valve at the time of using the high oil pressure apparatus.
CONSTITUTION: A valve body 39 is projected from the bottom part 23 of a spool 22 by the elastic force of a compression spring 26 at the time of using no high oil pressure apparatus. A pilot oil flow is thus secured by the oil passing through a throttle hole 44. The valve body 39 is pushed into a through hole 38, and the opening of the throttle hole 44 is hidden when the oil pressure at an oil supply port 17 increases. As a result, the pilot flow rate is decreased extremely.
Inventors:
IMAZATO KAZUNARI
Application Number:
JP21000893A
Publication Date:
February 10, 1995
Filing Date:
August 03, 1993
Export Citation:
Assignee:
SANWA SEIKI MFG CO LTD
International Classes:
F15B11/028; F16K17/10; (IPC1-7): F16K17/10; F15B11/028
Attorney, Agent or Firm:
Kinzo Oyama (1 person outside)