Patent ID: 7918436

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 is disposed at an opening which is formed in the main body and connected to the inflow pipe; and wherein the drive part comprises: a motor which is a drive source; and a linearly moving mechanism part for driving the valve element so as to abut with or separate from the opening by rotation of the motor; wherein the linearly moving mechanism part comprises: a rotary power transmission member which is rotatable by the motor; a linearly moving member for moving the valve element in an open direction which is moved by a cam face that is formed on a valve element side of the rotary power transmission member; a turning prevention mechanism which restricts turning of the linearly moving member; and an urging member for urging the valve element in a closing direction; and wherein the turning prevention mechanism comprises: a shaft which turnably supports the rotary power transmission member; and a shaft hole which is formed in the linearly moving member that is supported by the shaft; and wherein the shaft is engaged with the shaft hole to prevent turning of the linearly moving member; wherein the turning prevention mechanism includes a recessed part which is formed in an outer peripheral face of the shaft and a protruded part which is protruded from the shaft hole of the linearly moving member to an inner side of the shaft hole to engage with the recessed part.