1. Valves, Gauges and other Safety Fittings for Application to Boilers and to Piping Installations for and in Connection with Boilers,1975
2. Specification for Safety Valves, Gauges and other Safety Fittings for Air Receivers and Comporessed Air Installations,1976
3. A.S.M.E. Boiler and Pressure Vessel Code, Section 1,1971
4. The Design of Valves and Fittings;Pearson,1964
5. National Board and A.S.M.E. History on Safety Valves and Safety Devices;Harrison;J.P.V. Tech., Trans. A.S.M.E.,1979