Stop and regulating valves for radiochemical plants

The papers on developing stop and regulating valves and selecting material for these valves are reviewed. The main technical requirements of the radiochemical production to the valves are: the fluid stream velocity of 0.2-10000 l/s, remote exchange, one year lifetime or 15O00 cycles, the pressure and temperature of the fluid up to 0.6 MPa and up to 120 deg C. It is presupposed to use 03Cr18Ni12 and 03Cr18Ni12MO2-3 type steels for these valves. The CrWCO type lining materials for the working medium of nitrogen acid are acknowledged unfit. Significantly better anticorrosion properties are found for the electrodes with the 1Cr18Ni Mo2-5 Mn2-4 type lining. The bellow valve design meets the suggested technical requirements most fully. Two perspective projects of the valve of this type are presented