Mueller Lineseal XPII, XP Butterfly Valves Class 250B

Valves shall be manufactured with a 250 psi rating. Mueller Lineseal XPII and XP Butterfly Valves Class 250B For Buried Service shall be capable of operating at pressures of 250 psi and will comply with the following details:

Valve Bodies shall be constructed of ductile iron ASTM A-536 (65-45-12). End connections shall be as specified on the plans.

Valve Discs shall be stainless steel ASTM A-351 Grade CF8M (3" and 4"); shall be ductile iron ASTM A-536 (65-45-12) and furnished with 316 stainless steel seating edge to mate with the rubber seat (6" through 48").

Valve Seats shall be Buna N rubber (EPDM option) located on the valve body, and shall be retained without the use of metal retainers or other devices located in the flow stream.

Valve Shafts shall be stainless steel ASTM A-564 Type 630 Condition H-1150. Through shaft for 3" through 20" and stub shaft for 24" through 48" shall be acceptable.

Shaft Seals shall be standard Buna N (EPDM option) self-adjusting, Chevron V-Type packing. Shaft seals shall be of a design allowing replacement without removing the valve shaft.

Valve Bearings shall be sleeve type that are corrosion resistant and self-lubricating. Bearing load shall not exceed1/5th of the compressive strength of the material.