Malleable iron nitcher tee

  Datasheet (PDF)

The Georg Fischer malleable cast iron pitcher tee 131, designated under design symbol ISO/EN E1, is a high-integrity threaded branching component engineered for optimized hydraulic redirection within industrial, utility, and building service piping systems. Manufactured exclusively from decarburised annealed whiteheart malleable cast iron grade EN-GJMW-400-5 in compliance with EN 1562 and EN 10242 (Design Symbol A), this fitting provides superior mechanical strength, high fracture elongation, and exceptional structural ductility capable of absorbing significant vibration, thermal stress, and installation moments. Unlike standard square branch tees, the pitcher tee features a sweeping, hydraulically contoured branch curvature that gently directs the fluid stream, substantially lowering local turbulence, flow separation, and head loss across the diversion run. Corrosion protection is delivered through a premium hot-dip galvanised zinc finish applied in strict accordance with EN 10242, yielding a durable iron-zinc alloy base with a pure zinc outer layer exceeding 70 micrometers in average thickness, ensuring hygienic compliance with DIN 50930-6 for potable water installations. Each port is precision-machined with parallel internal pipe jointing threads (Rp) conforming to EN 10226-1 and ISO 7-1, enabling dependable, pressure-tight metallic thread compression when mated with external taper threads (R) using suitable non-hardening or anaerobic sealants. The fitting operates reliably under demanding industrial conditions, maintaining a maximum permissible working pressure of 25 bar at fluid temperatures between -20 degrees and 120 degrees Celsius, and up to 20 bar at temperatures reaching 300 degrees Celsius. Engineered in accordance with standardized z-dimensions, the unit allows for precise prefabrication calculations, rapid center-to-center axis alignment, and enduring integrity across cooling circuits, heating distribution networks, fire protection lines, and compressed air systems.