The technique of trustworthy valves

The introduction discusses the reasons for requiring trustworthy valves and a definition of ¿trustworthy valves¿ is attempted. Following a survey of world progress in this subject, a section is given to the design problems involved with illustrations of equipment used. Next follows a description of manufacturing procedure and the different techniques necessary, together with information on testing methods. In conclusion, the paper requests greater co-operation from the customer, i.e., conservative operation, field reports, restricted range of types and large production plans.