LIFT VALVE Russian patent published in 1994 - IPC

FIELD: pipe line fittings. SUBSTANCE: housing provided with inlet and outlet branch pipes receives shutoff member made in form of plate connected with stem by means of inserted half-rings and mounted rotatably relative to stem. Bush with external thread is secured on stem between its end and shut-off member and is engageable with thread made in inlet branch pipe. Stem has axial hole, plate is provided with tail-piece received by this hole and secured by means of rings. Washer made of antifriction material is arranged between ends of bush and plate. On outer surface of bush there are longitudinal slots whose depth exceeds depth of thread profile. Plate is provided with cylindrical projection whose diameter is equal to diameter of through-way hole of branch pipe of equipment being locked. EFFECT: enhanced reliability. 4 cl, 2 dwg