CONTROL VALVE

PROBLEM TO BE SOLVED: To allow for suppressing impact sound generated when a check valve body of a pilot check valve is separated from a valve seat, in a control valve provided with the pilot check valve between a lift-lock poppet valve and a switch valve.SOLUTION: A pilot check valve 5 is equipped...

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Bibliographic Details
Main Author NISHIGUCHI HIROMI
Format Patent
LanguageEnglish
Japanese
Published 29.09.2016
Subjects
ACTUATING-FLOATS
BLASTING
COCKS
DEVICES FOR VENTING OR AERATING
ENGINEERING ELEMENTS AND UNITS
GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS
HEATING
LIGHTING
MECHANICAL ENGINEERING
TAPS
THERMAL INSULATION IN GENERAL
VALVES
WEAPONS
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Summary:PROBLEM TO BE SOLVED: To allow for suppressing impact sound generated when a check valve body of a pilot check valve is separated from a valve seat, in a control valve provided with the pilot check valve between a lift-lock poppet valve and a switch valve.SOLUTION: A pilot check valve 5 is equipped with: a check valve body 7 which can move between a close valve position shutting off a high-pressure chamber 6a communicating with a back pressure chamber and an intermediate passage 6b, and an open valve position communicating with the high-pressure chamber and the intermediate passage; a valve body 6 equipped with a valve seat 6e in which the check valve body positioned at the close valve position is seated; a closing side energizing means 71 for energizing the check valve body to a side seating in the valve seat; and a pin 9 which energizes the check valve body to a side separating from the valve seat against the energizing force of the closing side energizing means when a hydraulic fluid is supplied into a pilot chamber 6x1, and can slide in a pin insertion hole provided on a valve body. The pin is equipped with a notch which communicates with the high-pressure chamber and the intermediate passage when the check valve body is arranged at the open valve position.SELECTED DRAWING: Figure 2 【課題】リフトロックポペットバルブと切換弁との間にパイロットチェックバルブが設けられるコントロールバルブにおいて、パイロットチェックバルブのチェック弁体が弁座から離間する際の衝撃音を抑制可能とする。【解決手段】パイロットチェックバルブ５が、背圧室に連通する高圧室６ａと中間通路６ｂとの間を遮断する閉弁位置及び高圧室と中間通路とを連通する開弁位置の間で移動可能なチェック弁体７と、閉弁位置に位置するチェック弁体が着座する弁座６ｅを備えるバルブボディ６と、チェック弁体を弁座に着座する側に付勢する閉止側付勢手段７１と、パイロット室６ｘ１に作動液の供給を受けた際に閉止側付勢手段による付勢力に反してチェック弁体を弁座から離間する側に付勢しバルブボディに設けたピン挿通孔内を摺動可能なピン９とを備え、ピンが、チェック弁体を開弁位置に配した際に高圧室と中間通路とを連通する切り欠きを備える構成を採用する。【選択図】図２
Bibliography:Application Number: JP20150053762