Emerson Fisher 912 Series 1/4 in. FNPT Zinc Alloy Single Stage Pressure Reducing Regulator w/ 3 - 7 in. w.c. Spring, 101K BTU/HR - John M. Ellsworth Co. Inc.
Control Valve Handbook (Fisher, Emerson Process Management) : Fisher Controls International, LLC,Emerson Process Management: Amazon.it: Libri
Fisher Valves & Instruments - Emerson engineers started with a clean slate in developing Fisher™ GX control valves. Their goal was to bring unmatched innovation, technology and reliability to control valve ownership.