Mueller 24-48 Lineseal Butterfly Valve

Corrosion-resistant Shafts Constructed of ASTM A-564 Type 630 H-1150 stainless steel. Two-piece, stub-type shafts are sized per AWWA Standard C504.

Chevron V-Type Packing Self-adjusting packing in top trunnion of valve body where shaft protrudes.

Self-lubricating Bearings Sleeve-type bearings are used in both trunnions of the valve body. Teflon lined with special nonmetallic backing. Provide electrical insulation between disc and shaft to prevent galvanic corrosion. Low coefficient of friction reduces operating torque requirements.

Elastomeric Seat Specially compounded Buna N seat seals a full 360°against a stainless steel spherical disc edge. Unique grooved-seat design, coupled with the wide, spherically shaped seating edge of the disc, allows greater disc closure tolerance (up to 1°off center in closed position without leakage). Seat is mechanically retained in body without metal hardware by a cast epoxy compound that ensures the seat conforms to the precise radius of the disc with uniform contact pressure. It is fully field adjustable and replaceable.

Strong Shaft Connections Disc and shafts are connected by tapered stainless steel pins designed to transmit required torques and withstand stresses imposed under severe operating conditions.