ELECTROMAGNETIC TYPE PRESSURE REDUCTION VALVE AND HYDROSTATIC PRESSURE CONTROL DEVICE INCLUDING ELECTROMAGNETIC TYPE PRESSURE REDUCTION VALVE

• Main Authors: YAMAGATA HIDEKI, KOJIMA MASASHIGE, FUJII ATSUSHI, EGAWA YOSHIHIRO, TERAO TAKESHI
• Format: Patent
• Language: English; Japanese
• Published: 20.09.2018
• Subjects: ACTUATING-FLOATS; BLASTING; COCKS; CONTROLLING; 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; PHYSICS; REGULATING; SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES; TAPS; THERMAL INSULATION IN GENERAL; VALVES; WEAPONS

PROBLEM TO BE SOLVED: To expand a pressure adjustable range of an electromagnetic type pressure reduction valve.SOLUTION: An electromagnetic type pressure reduction valve 40 includes: a spool valve 42 for permitting or blocking communication between a pilot passage 26 and a pilot pressure supply passage 28; and a solenoid 41 for imparting thrust force according to a level of supplied current to the spool valve 42. The spool valve 42 has a pressure receiving face 42d that generates thrust force in an opposite direction to the thrust force of the solenoid 41 when pressure from the pilot pressure supply passage 28 acts thereon. An area of the pressure receiving face 42d is set smaller than a cross sectional area of the spool valve 42.SELECTED DRAWING: Figure 2 【課題】電磁式減圧弁の圧力調整範囲を拡大させる。【解決手段】電磁式減圧弁４０は、パイロット通路２６とパイロット圧供給通路２８との連通を許容又は遮断するスプール弁４２と、供給される電流の大きさに応じた推力をスプール弁４２に付与するソレノイド４１と、を備える。スプール弁４２は、パイロット圧供給通路２８の圧力が作用することによって、ソレノイド４１による推力とは反対方向の推力を生じさせる受圧面４２ｄを有し、受圧面４２ｄの面積は、スプール弁４２の横断面積よりも小さく設定される。【選択図】図２