Patent ID: 7922152

Claim:
A valve element opening/closing device comprising: a main body which is formed with a space in an inside of the main body; an inflow pipe which is connected to the main body for flowing fluid into the space; an outflow pipe which is connected to the main body for flowing the fluid out from the space; a valve element for opening and closing a flow passage through which the fluid flows from the inflow pipe to the outflow pipe through the main body; and a drive part for driving the valve element to open and close the flow passage; wherein the valve element, which is moved by the drive part to be in an open state or in a close state, is arranged on an inflow pipe side with respect an opening of the main body to which the inflow pipe is connected; wherein the drive part comprises: a motor which is a drive source; and a linearly moving mechanism part which drives the valve element so as to be abutted with or separated from the opening by rotation of the motor; and the linearly moving mechanism part comprises: a linearly moving member which is connected with the valve element; a cam which is turned by the motor for moving the valve element in a separating direction from the opening through the linearly moving member; and an urging member for urging the valve element in a closing direction of the valve element; wherein the valve element opening/closing device further comprises: a base plate which structures the main body and which is formed with an opening connected with the inflow pipe; and a valve seat which is fixed on the inflow pipe side of the opening formed in the base plate and, with which the valve element is tightly contacted to close the flow passage; wherein the valve element is disposed on the inflow pipe side of the valve seat and within the inflow pipe; wherein the linearly moving mechanism part comprises: a transmitting gear which is turned by the motor; and a slider for moving the valve element in an open direction by a gear side cam face as the cam which is formed on a valve element side of the transmitting gear; wherein the transmitting gear is disposed on a main body side with respect to the valve seat; and the valve element is mounted on the slider which is penetrated through the valve seat; and wherein the transmitting gear, the slider, the valve seat and the valve element are coaxially disposed.