Patent ID: 9534614
Date: 2017-01-03
CPC Classifications: F15B,F16K,Y10T

Claim:
1. A safety device for a pressure medium tank, comprising: a filling/checking port having an internally threaded hole adjacent an inner end thereof connectable to a tank interior and having an adjoining hollow cylindrical segment, said threaded hole and said cylindrical segment defining a flow passage through said port for passage of a medium therethrough; a closure screw having an externally threaded shaft and a head, said shaft being threadedly engaged with said threaded hole, said head being located and retained in said cylindrical segment, tightening of said screw in said threaded hole blocking said flow passage; a blocking element anchored in said cylindrical segment and forming stop surfaces projecting into an interior of said cylindrical segment to limit a free path of movement of said closure screw in said port in an unthreading direction to maintain threaded engagement of said threaded hole and said threaded shaft by coming into direct contact with said head of said closure screw; and a torque limiter coupled to said closure screw limiting torque that can be transmitted to said closure screw in the unthreading direction.