BACK PRESSURE VALVE - Miwa Seiki Co., Ltd.

Title:

BACK PRESSURE VALVE

Document Type and Number:

Japanese Patent JP3487623

Kind Code:

B2

Abstract:

PURPOSE: To increase the working speed of a high hydraulic pressure equipment by reducing the amount of pressure oil returned through a pilot valve to an oil tank during the use of a high hydraulic pressure equipment such as an actuator or the like.
CONSTITUTION: First and second throttle holes 27 and 28 are opened via sufficiently wide through-holes 39 and 39 during non-use of a high hydraulic pressure equipment. During the use thereof, when hydraulic pressure in an oil supplying port 17 increases, the bottom end surface 43 of a plug 37 abuts on the upper end surface 42 of a housing 25. In this state, the first and second throttle holes 27 and 28 are communicated with each other only through a third throttle hole 41 having a smaller flow path area.

Inventors:

Masatake Kuroki

Application Number:

JP33015593A

Publication Date:

January 19, 2004

Filing Date:

December 27, 1993

Export Citation:

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