PISTON SEAL Russian patent published in 1995 - IPC

FIELD: pumping technique. SUBSTANCE: mounted in piston groove is ring with stepped lock and vertical webs on part of width of ring and horizontal webs overlapping each other. Circular elastomer distance sealing member is engageable with inner surface of ring. Vertical webs are provided with two sections of different radii constructed from different centers and smoothly converting from one to other. Section of lesser radius is provided on side of inner cylindrical surface of ring; its center is located on diameter passing through beginning of second section whose radius is constructed from center of ring circle. EFFECT: enhanced reliability. 5 dwg