Self-operated Pressure Regulators Steam Pressure Reducing Valve Type 39-2 Application Set points from 0.02 bar to 16 bar · Valves in DN 15 to DN 50 Nominal pressure PN 16 and PN 25 · Suitable for steam up to max. 350 °C The Type 39-2 Steam Pressure Reducing Valve regulates the steam pressure downstream from the valve to an adjusted set point. The valve closes when the downstream pressure rises. Special features • Low-maintenance P-regulators requiring no auxiliary energy • Actuator and springs are exchangeable • Single-seated valve with balanced valve plug and a frictionless plug stem sealing by means of a stainless steel bellows • All wetted parts are free of non-ferrous metal Versions Type 39-2 Steam Pressure Reducing Valve: Valve body made of cast iron, spheroidal graphite iron or cast steel · Actuator (with EPDM rolling diaphragm) · With condensation chamber and screw fitting · For steam temperatures up to 350 °C. Special version With St I flow divider for especially low-noise operation. For details, see Data Sheet T 8081 EN. When the flow divider St I is retrofitted, the valve seat must be replaced. Fig. 1 · Type 39-2 Steam Pressure Reducing Valve ANSI versions are available on request. Accessories (refer to T 2595 EN) Screw fitting for the control line connection Condensation chamber with funnel tube for collecting condensate and as a temperature safeguard Conical expansion piece, nominal pressure PN 16 or PN 40 Associated Information Sheet

Principle of operation (Fig. 2) The process medium flows through the valve in the direction indicated by the arrow. The position of the valve plug determines the flow rate between the free area between the plug (3) and seat (2). The downstream pressure (p2) to be controlled is transmitted via a control line (14) to the operating diaphragm (13) where it is converted into a positioning force. This force adjusts the valve plug as a function of the spring force. The spring force can be adjusted using the set point adjustment (6). The balanced valves are equipped with a stainless steel bellows (4)....

Table 1 · Technical data · All pressures in bar (gauge) Nominal size Nominal pressure Temperature range Valve plug Actuator with condensation chamber Max. perm. differential pressure ∆p Set point ranges Leakage rate Valve spring force F and actuator area A See Table 4 · Dimensions in mm and weights Table 2 · Materials · Material number according to DIN EN Valve Nominal pressure Spheroidal graphite iron EN-JS1049 (GGG-40.3) Stainless steel Stainless steel Sealing ring Graphite with metal core Actuator Diaphragm cases EPDM with fabric reinforcement · Max. perm. ambient temperature 80 °C Table 3...

Nominal size Length L (valve) L1 (valve + conical expansion piece) Height H Valve spring force F Height H Actuator Valve spring force F Height H Valve spring force F Height H Actuator Valve spring force F Height H Valve spring force F Height H Actuator Valve spring force F Height H Valve spring force F Dimensional drawing Specifications subject to change without notice. SAMSON AG • MESS- UND REGELTECHNIK WeismullerstraBe 3 • 6 0314 Frankfurt am Main • Germany Phone: +49 69 4009-0 • Fax: +49 69 4009-1507 Internet: http://www.samson.de