JPS55119269A - Solenoid valve - Google Patents

Abstract

PURPOSE: To effectively prevent water-hammering at the time of a valve closure, by providing an auxiliary valve in a main valve which vertically moves in accordance with the movement of a movable iron core and by operating the auxiliary valve with a time lag after shutting off most of a flow by the main valve.

CONSTITUTION: When a main valve 14 is pulled up through a movable iron core 34 by energizing a solenoid 33, an auxiliary valve 23 so far thrusted down by the pressure of water flow from an inlet port 2 to a pressurization chamber 24a through an aperture 20 and having its projecting tip 22a in pressurized contact with a packing 12 is pushed up by a spring 27. As a result, the water flows out through a valve port 10. When the solenoid 33 is deenergized in that state, the main valve 14 is urged under pressure against a valve seat 9 by another spring 28 and most of the water flow is instantaneously stopped. However, since the auxiliary valve 27 is lifted by the spring 27, the auxiliary valve is kept open until a prescrived pressure develops in the pressurization chamber 24a after the closure of the main valve 14. This results in the prevention of water-hammering.

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