DRAIN SAFETY VALVE Russian patent published in 2013 - IPC F16K17/06 

FIELD: machine building.

SUBSTANCE: drain safety valve is equipped with a stem rigidly and coaxially fixed on a body, with a lock and a driving element installed on it as capable of reciprocal motion towards each other and made as equal in mass and interacting with each other by means of crossing levers with hingedly fixed elements of swinging at the ends. The axis of lever rotation is fixedly fixed on a guide stem. The lock is equipped with guides arranged in its upper part for interaction with elements of swinging, and two circular ledges of equal diameter arranged in the lower part of the lock. The first of the ledges interacts with a seat mounted in the body, and the second one - with an additionally installed seat fixed on the stem. The driving element comprises a nut to form a threaded pair with each other. The lower part of the driving element comprises guides for contact with swinging elements of crossing levers. The upper part of the driving element is made in the form of a sleeve. In the sleeve there is a fixed piston with seals to form an above-piston cavity communicated with a protected reservoir by a channel of pressure transfer, and a spring is arranged additionally coaxially to the stem. The upper end of the spring rests against the driving element, and the lower one - against the lock. In the inner cavity of the piston there is an additional piston installed sealed with a bellows unit and having a stem and a return spring.

EFFECT: increased sensitivity of a valve, accuracy of pressure maintenance in a protected reservoir and accuracy of adjustment of valve tuning parameters under conditions of dynamic loads and cryogenic temperatures.

2 dwg