Patent ID: 8800959

Claim:
A flow-rate control valve comprising: a lower casing including a channel that leads a liquid and fluid, and a valve seat; a valve body that controls, in conjunction with the valve seat, a flow rate of the liquid and the fluid that pass through the channel; a linear stepping motor connected to a reciprocating drive part that controls and moves the valve body in a direction closer to or away from the valve seat linearly; and an upper casing housing the reciprocating drive part, wherein the valve body includes: a flange coupled by a bellows to a fitting portion providing selective engagement in which the valve body including the fitting portion is engaged with the valve seat in various positions to vary the flow rate; and an insertion hole that receives a shaft body extending from the reciprocating drive part, and wherein the flange has a substantially disk shape; and a communication portion extending through inside the flange, and the communication portion linking the inside of the insertion hole with air.