PTFE Lined Reducing Flanges

A wafer-style lined flange with concentric bores that steps the line down in a single component, without the length a reducer needs. Because it is a wafer design with threaded bolt holes it sits between two existing flanges, so you can reduce a bore at a valve or equipment connection where there is no room for a conventional reducer spool.

Base materials Ductile Iron GGG40.3 / ASTM A395, Cast Steel ASTM A216 Gr. WCB or stainless steel. Liner type virgin unpigmented PTFE or anti-static PTFE, with moulded FEP and PFA as standard lining materials and PVDF, PP and HDPE as options, at a minimum 3.5 mm, 6.0 mm overall (±1.0 mm tolerance).

15 mm × 25 mm up to 200 mm × 250 mm, with larger sizes on request. Flange standard ANSI B16.5 / B16.42, face-to-face per ANSI B16.5 #150, drilling in DIN PN10/16, BS 10 or ASME 150/300, with DIN 2632/2633 and BS 10 Table D, E, F on request. Spark tested at 20 KVDC and hydraulically tested at 29 kg/cm² after lining.

Use a reducing flange where space is tight and the step happens right at a flange face — at a valve inlet, a pump nozzle or an instrument connection. Use a concentric or eccentric reducer where there is room in the run, because a gradual taper costs far less pressure drop and less turbulence than an abrupt step. The flange is the compact answer, not the hydraulically better one.

MVS manufactures at its own works — since 1978, ISO 9001:2015 certified — and exports across several continents. The minimum order quantity is 20 pieces. Anti-static liners, stainless bases, alternative drilling standards, earthing studs and vent extensions are built to order.