GATE VALVE Russian patent published in 1996 - IPC

FIELD: valve. SUBSTANCE: gate valve has spindle and compensating rod. The grooves in the bottom cover and top cover are provided with spring-loaded bushings with collars. The bushings bear on fusible washers received in additional bores made in the bottom and top covers, respectively. The end faces of the bushings are in a contact with bottoms of hollow trapezium sealing rings whose inner surfaces are in a contact with the surfaces of the spindle and compensating rod and outer surfaces are in contact with the cover bores. The ring stop with semi-round cross-section received in the space of the trapezium can interact with the sides of the sealing rings. When fusible washers is melted and sealing glands are burnt out (in fire), the spring-loaded bushings act on the sealing rings, which are in a contact with the ring stops, and seal the gate with respect to the ambient to hold its operation capability after fire without replacing sealing glands and fusible washers. EFFECT: enhanced reliability. 2 dwg