Patent ID: 8506692

Claim:
A valve comprising: a valve housing defining therein a fluid passage composed of a first passage and a second passage; a first valve member configured to open and close the fluid passage; a first biasing member pressing the first valve member in a first valve-closing direction along a flow direction from the first passage to the second passage; a second valve member configured to open and close the fluid passage; a second biasing member pressing the second valve member in a second valve-closing direction along the flow direction from the first passage to the second passage; an electromagnetic driving member having a pressing member configured to open the first valve member and the second valve member in stages; a third valve member configured to open and close the fluid passage; and a third biasing member pressing the third valve member in a third valve-closing direction along a flow direction from the second passage to the first passage; wherein the third valve member is configured to open the fluid passage when internal pressure of the first passage is higher than internal pressure of the second passage by more than a first predetermined value.