| 摘要 |
PROBLEM TO BE SOLVED: To provide an electromagnetic proportional pressure control valve capable of controlling the fluid pressure in a control passage in a predetermined control mode without enlarging an electromagnetic apparatus even when the diameter of the control passage is increased. SOLUTION: In the electromagnetic proportional pressure control valve, a control passage 4 with pressurized fluid flowing therein and a discharge passage to allow working fluid to flow to the low-pressure side are communicated with a valve hole 2 of a valve body 1, a valve seat 7 is formed between a control passage communication part and a discharge passage communication part of the valve hole 2, and a valve element 12 which is seated on or separated from the valve seat 7 is movably accommodated in the valve hole 2. The spring force of a pressure regulation spring 13 is applied to the valve element 12 in the seating direction, and the fluid pressure of the control passage 4 is applied against the spring force of the pressure regulation spring 13 in the separating direction. In the control valve, a piston 14 to control the spring force of the pressure regulation spring 13 is movably accommodated in the valve hole 2, the pilot pressure corresponding to the working force of an electromagnetic apparatus 21 of a pilot valve 18 is applied to the piston 14, the piston 14 is moved according to the pilot pressure to control the spring force of the pressure regulation spring 13. COPYRIGHT: (C)2005,JPO&NCIPI
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