| 摘要 |
A pilot solenoid valve capable of reducing water hammer and valve element abutment impact by the opening/closing or the closing of a valve without causing disadvantages with respect to clogging, lowest operating pressure difference, stability of operation, flow of main flow passage, and outline dimensions. The pilot solenoid valve comprises a communication chamber (1) allowing a bleed hole (3a) to communicate with a pilot hole (3b), an orifice (1a) allowing the communication chamber (1) to communicate with a valve chamber (3), the valve (2) restricting the orifice (1a), a groove (2b) in the closing surface (2a) of the valve (2), and a compressive coiled spring (12) suppressing the closing of the valve (2) by the force of a pressure difference or having a spring force less than the force of the pressure difference of the valve (2). When the orifice is restricted, the valve (2) is opened by a pressing force caused by the reciprocating motion of the valve element (4) or the force of the pressure difference to increase the effective cross sectional area of the orifice (1a) less than that of the bleed hole to that of the pilot hole (3b) or larger.
|
