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NDT Series Thermdynamic Steam Trap AVAILABLE MODELS FEATURES The NDT-421 is a thermodynamic steam trap, designed to remove condensate from steam mains and for those applications where the release of air is a concern. It is manufactured in stainless steel. It is unaffected by waterhammer and vibration. Its hardened stainless steel disc ensures intermittent discharge with perfect shut off. Can be supplied with screwed connections NPT (ANSI-B1.20.1). Contact factory for other connection options. NDT-421: Saturated Steam* *NDT 1/4”, only NPT and for saturated steam 1/2" and 3/4" NPT Adapters are available NDT-421.5A 1/2" NPT Example HOW TO SPECIFY Specify • Model • Sizes and type of connection • Optional, if necessary EX.: 1 Thermodynamic Steam Trap NDT-421, for saturated steam, with 1/4” body and NPT connection. DIMENSIONS & WEIGHT (inches/pounds) 1.95 0.200 1.30 1.26 1/4” MODEL Pipe Size 243 110 441 507 683 838 10 50 100 150 200 250 NDT-421 ,1/4" 1/2" 3/4" CAPACITY - Differential Pressure - ΔP (psig) x Q (lbs/hr) Model Sizes Connections Body Material Options PMO (Max. Oper. Pressure) TMO (Max. Oper. Temperature) Min. Inlet Pressure Maximum Backpressure NDT-420 1/4" and 1/2" with adapter Screwed AISI 420 SS Insulated Cover 227.57 psig 662º F 3.56 psig 50% of Operating Pressure DN A B C Weight Thermaflo Inc. 2880 Fair Avenue Newberry, South Carolina 29108 Oakland Mill Complex 704-940-1228 www.thermafloengineering.com A Dimension with 1/2" adapter 4"
