SEALING UNIT FOR ROD OF SHUT-OFF CONTROL FITTINGS

摘要

FIELD: sealing technology. SUBSTANCE: sealing unit includes bearing and hold-down members located in bore of housing of fitting and sealing rings made from expanded graphite for sealing the surfaces of rod and bore of housing. Two opposite ends of bore of body are provided with two metal cylindrical circular reservoirs. Each reservoir partially embraces adjacent sealing ring. Open ends of reservoirs are directed towards each other and are separated respectively from bearing and hold-down members by means of sealing rings made from expanded graphite. EFFECT: enhanced efficiency of sealing. 3 cl, 3 dwgt