DIRECTIONAL CONTROL VALVE

• Main Author: KOBAYASHI YOSHINOBU
• Format: Patent
• Language: English; Japanese
• Published: 05.10.2017
• Subjects: ACTUATING-FLOATS; BLASTING; COCKS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR; DEVICES FOR VENTING OR AERATING; ENGINEERING ELEMENTS AND UNITS; FLUID-PRESSURE ACTUATORS; FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; HYDRAULICS OR PNEUMATICS IN GENERAL; LIGHTING; MECHANICAL ENGINEERING; SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; TAPS; THERMAL INSULATION IN GENERAL; VALVES; WEAPONS

PROBLEM TO BE SOLVED: To provide a directional control valve capable of incorporating a check valve for another hydraulic source in an existing valve casing.SOLUTION: One-side supply passage 56 is connected to a hydraulic pump 9A, and the other-side supply passage 59A is connected to an additional hydraulic pump 10. A flow path blocking member 61, a valve seat member 64 and a check valve 65 are provided in one-side connection port 57 and the other-side connection port 58. A valve element 61A of the flow path blocking member 61 is provided in the one-side connection port 57 and blocks a flow from hydraulic pressure source side oil passages 53, 53 to the one-side supply path 56. A sleeve 61B of the flow path blocking member 61 is fitted into the other-side connection port 58. The valve seat member 64 regulates the position of the flow path blocking member 61. The check valve 65 permits a flow from the other-side supply passage 59A to the hydraulic pressure source side oil passages 53, 53, and blocks the reverse flow. Sleeve openings 62 are provided in the sleeve 61B of the flow path blocking member 61.SELECTED DRAWING: Figure 5 【課題】既存の弁ケーシングに他の油圧源用のチェック弁を内蔵できる方向制御弁を提供する。【解決手段】一側供給通路５６は、油圧ポンプ９Ａに接続され、他側供給通路５９Ａは、追加の油圧ポンプ１０に接続される。一側接続ポート５７および他側接続ポート５８内には、流路遮断部材６１と、弁座部材６４と、チェック弁６５とを設ける。流路遮断部材６１の弁体６１Ａは、一側接続ポート５７に設けられ、油圧源側油路５３，５３から一側供給通路５６への流れを遮断する。流路遮断部材６１のスリーブ６１Ｂは、他側接続ポート５８に挿嵌される。弁座部材６４は、流路遮断部材６１の位置を規制する。チェック弁６５は、他側供給通路５９Ａから油圧源側油路５３，５３への流れを許し、これとは逆の流れを遮断する。流路遮断部材６１のスリーブ６１Ｂには、スリーブ開口６２を設ける。【選択図】図５