THROTTLE VALVE AND WEFT INSERTION APPARATUS IN JET LOOM PROVIDED WITH SAME

摘要

PURPOSE: A weft insertion apparatus in a jet loom provided with a throttle valve comprising a valve hole and a valve body inserted into the valve hole is provided. The throttle is low in pressure loss, easy to control flow quantity and high in precision. CONSTITUTION: The throttle valve comprises a valve hole(63) bored to be orthogonal to a fluid channel(62); and a valve body(64) inserted into the valve hole to be rotatable about an axial center, wherein a concave engraved portion(69) whose depth is continuously varied in a circumferential direction is formed on a circumferential surface of the valve body at a position corresponding to an opening of the fluid channel. The fluid channel connects a compressed air source regulated for pressure in a jet loom to a nozzle for injecting the compressed air. The depth of the concave engraved portion becomes deeper in a circumferential direction and then becomes shallower slowly.