Mueller 3"-20" Lineseal Butterfly Valve

Chevron V-Type Packing Self-adjusting,long lasting and should never need replacement because quarter-turn valve operation causes little or no wear. Packing bears on turned, ground and polished stainless steel, reducing wear.

Corrosion-resistant Shaft Constructed of stainless steel (Lineseal III is type 304, Lineseal XPII and XP are ASTM A-564 type 630 cond. H-1150). Shaft is one-piece, through-shaft construction sized to meet or exceed requirements of AWWA Standard C504.

Heavy Duty Body Rugged cast iron construction for Lineseal III valves or ductile iron for Lineseal XPII and XP valves. End connections include choice of flanges fully faced and drilled per ANSI B16.1 Class 125 or Class 250, or integrally cast mechanical joint ends. For Lineseal III valves, slip-on ends (for DI and PVC C900 pipe) are also available.

Self-lubricating Bearings Liberally sized, chemically inert nylon bearings are selflubricating and designed to last the life of the valve.

Streamlined Disc Lens-shaped disc is designed to minimize pressure drop and turbulence. Full open valve creates no more friction loss than a 45° elbow. Disc is secured to the shaft by stainless steel pins sized to transmit required torques and withstand stresses imposed under severe operating conditions. Lineseal III disc is cast iron, ASTM A-126 Class B with 316 stainless steel disc edge. Lineseal XPII and XP discs are ductile iron ASTM A-536 (65-45-12) with 316 stainless steel disc edge. (Discs for 3" and 4" Lineseal valves are cast stainless steel, ASTM A-351 CF8M.)

Elastomeric Body Seat Buna N seat is bonded to the body*. The seat cannot be torn from the body under normal pipeline conditions. The precision molding process also ensures that the disc/seat interference cannot cause excessive wear or abrasion during operation.

Tamperproof Disc Centering Precision molded flats in the bonded seat at the body trunnion mate with machined flats on the disc to provide tamperproof centering of the disc in the body*. Positive disc alignment, without play, assures long seat life.