SAFETY VALVE Russian patent published in 1995 - IPC

FIELD: valving. SUBSTANCE: safety valve has housing provided with inlet and outlet branch pipes and axially alined, spring-loaded main and control gates. Each of the gates interacts with the seat. In addition the valve has a bushing with passageway and seat arranged along the axis and fixing it to the housing by way of the rods. The main gate is made up as a sleeve which encloses the bushing having openings for the fixing rods in its bottom. Spaces are provided between the openings and rods. Total area of the spaces is less than the cross-section of the passageway of the bushing. EFFECT: enhanced reliability. 1 dwg