Spray unit that atomizes liquid at the start of the spray operation

摘要

A spray unit that is attached to an opening at a neck portion of a container for spraying a liquid material in the container, including: a cylinder unit composed of a large-diameter air cylinder and a small-diameter liquid cylinder having a valve hole and an operating member. The operating member is composed of a large-diameter cylindrical piston, a stem having a check valve, and a press-down head having a spray nozzle hole. The liquid is to be sprayed when the operating member is pressed down. When the operating member is pressed down, a liquid flow-out path and an air ejecting path come together via a small gap inside the spray nozzle hole. The spray unit further includes a flow rate control valve is composed of a valve seat provided at an upper face of a valve hole of the liquid cylinder and a valve body arranged above the valve seat to be seated on or released from the valve seat. At least one of the valve seat and the valve body is provided with a small flow path that is not closed even when the valve body sits on the valve seat and that always communicates the interior of the container with the interior of the liquid cylinder, and the flow rate control valve is provided with a large flow path that is opened when the valve body is released from the valve seat and closed when the valve body sits on the valve seat. The sectional area of the small flow path is smaller than an open area of the valve hole of the air cylinder and that of the valve hole of the check valve provided inside the stem. The combination overcomes the delay in ejecting the liquid.