Patent ID: 9494254
Filing Date: 2016-11-15
CPC Classification: F02M,F16K

Claim Text:
1. An electro-magnetic valve comprising: a valve chamber having a first passage opening that is open to a first passage and a second passage opening open to a second passage; a first valve seat annularly formed on an outside of the first passage opening in the valve chamber; a switch valve body in the valve chamber having a communication hole that has a smaller diameter than the first passage opening, the switch valve body switching a flow amount of a flow between the first passage and the valve chamber by lifting off from and seating on the first valve seat; a first spring biasing the switch valve body away from the first valve seat; a second valve seat annularly formed on an outside of an opening of the communication hole; an open-close valve body lifting off from and seating on the second valve seat while the switch valve body is seating on the first valve seat for communication between the first passage and the second passage by opening and closing the first passage to and from the valve chamber, the open-close valve body positioned on a lift-off side of the switch valve body relative to the first valve seat; a return spring biasing the open-close valve body toward the second valve seat; an electro-magnetic actuator lifting the open-close valve body from the second valve seat against a biasing force of the return spring, the electro-magnetic actuator positioned on a lift-off side of the open-close valve body relative to the second valve seat; and a pressure chamber defining member defining a pressure cancel chamber that reduces a pressure difference between both sides of the open-close valve body by applying a same pressure as a pressure in the first passage on the lift-off side of the open-close valve body relative to the second valve seat, wherein the communication between the first passage and the second passage is: the open-close valve body has, at a position inside of an abutting part that has an annular shape for seating on the second valve seat, a press member that presses the switch valve body toward the first valve seat with a biasing force greater than a force from the first spring during a period (a) between the all-close state and (b) a timing immediately after the lifting of the open-close valve body from the second valve seat.