API RP 550 P1 S6-1985 Manual on Installation of Refinery Instruments and Control Systems Part I - Process Instrumentation and Control Section 6 - Control Valves and Accessories (FOURTH EDITION)
1985API RP 550 P1 S6-1985 Manual on Installation of Refinery Instruments and Control Systems Part I - Process Instrumentation and Control Section 6 - Control Valves and Accessories (FOURTH EDITION)
1976API RP 550 P1 S6-1976 Handbuch zur Installation von Raffinerieinstrumenten und -steuerungssystemen Teil I – Prozessinstrumentierung und -steuerung Abschnitt 6 – Regelventile und Zubehör (DRITTE AUFLAGE)