Document Type and Number:
Japanese Patent JPH0132389
Kind Code:
B2
Abstract:
PURPOSE:To select each lead passage, by arranging each lead passage in the interior of a main valve, forming low and high pressure balance holes in the main valve, opening and closing the low pressure balance hole through an auxiliary valve and forcibly changing pressure internally and externally of the main valve. CONSTITUTION:When a coil 60 is not electrically conducted to flow a current, an armature 50 is moved rightward by action of a compression coil spring 59, while an auxiliary valve 53, connected to an actuator plate 57, is moved rotating about a rotary supporting shaft 52a of a main valve 52 as the supporting point, simultaneously the main valve 52 is also moved rotating about the rotary supporting shaft 52a as the supporting point by action of a tension spring 54, and lead passages A, D and B, C are communicated then separately divided respectively to high and low pressure chambers 52d and 52c. Here pressure in a balance chamber 64 is equalized to pressure in the high pressure chamber 52e by a high pressure balance hole 52g provided in the high pressure chamber 52e. While a low pressure balance hole 52f is in a closed state by an auxiliary valve 53.
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Inventors:
SATO KATSUICHI
TAKAHASHI KIKUJI
TAKAHASHI KIKUJI
Application Number:
JP14100481A
Publication Date:
June 30, 1989
Filing Date:
September 09, 1981
Export Citation:
Assignee:
HITACHI LTD
International Classes:
F16K11/074; F16K11/06; F16K31/10; F16K39/04; F25B41/04
Next Patent: JPH0132390