Patent ID: 7270310
Filing Date: 2007-09-18
Classification: F16K,Y10T

Abstract:
1. An electromagnetic valve, comprising: an electromagnetic driving portion; a first valve body reciprocated by the electromagnetic driving portion; a second valve body including a communicating passage communicating a first passage with a second passage which is located at a downstream end of the first passage, and a first valve seat located at an upstream end of the communicating passage, wherein the first valve body cooperates with the first valve seat in closing the communicating passage; a second valve seat on which the second valve body seats, wherein when the second valve body seats on the second valve seat while the first valve body seats on the first valve seat, a communication between the first passage and the second passage is shut, when the second valve body seats on the second valve seat while the first valve body is lifted from the first valve seat, the communication between the first passage and the second passage is communicated, when the first valve body is lifted from the first valve seat while the second valve body seats on the second valve seat, the second valve body is lifted from the second valve seat in response to decrease of pressure difference between the first passage and the second passage, the first valve body includes a fluid-amount controlling portion inserted into the communicating passage on a downstream side of the first valve seat while the first valve body seats on the first valve seat, the diameter of the fluid-amount controlling portion decreasing stepwise in an inserting direction and on said downstream side, and when the lift amount of the first valve body from the first valve seat increases after the first valve body is lifted from the first valve seat, an opening area of a passage formed between the first valve body, the first valve seat and the communicating passage increases.