VALVE HEAD Russian patent published in 1996 - IPC

FIELD: valving. SUBSTANCE: two longitudinal, opposite, rectangular grooves and through lateral opening are provided in the spindle thread. The spindle is provided with two L-shaped inserts made of a durable material. The short ends of the inserts are received in the lateral opening. The long ends are received in the grooves. The outer surface of the long ends are provided with thread parts which are coincident with the thread of the spindle. A spring is positioned in the lateral opening. The spring loads both of the inserts. EFFECT: enhanced reliability. 3 dwg