M&H AWWA Large Diameter

• Style 1450
• Butterfly Valves
• Suggested Specifications
• (30"-48")

A. GENERAL

All Butterfly valves shall be of the rubber-seated tight-closing type designed, manufactured and tested in conformance to AWWA Standard C-504, latest revision. All valves shall be M&H Style 1450 Butterfly Valves, or approved equal.

B. VALVE

Valve Body shall be high strength cast iron ASTM A-126, Class B, with 18-8 Stainless Steel Body Seat. Valve Vane (Disc) shall be of cast or ductile iron, ASTM A-536, Grade 65-45-12 having rubber seat mechanically secured with a serrated 18-8 Stainless Steel Clamp Ring and 18-8 Stainless Steel self-locked screws. Rubber Seat shall be a full-circle 360º seat not penetrated by the valve shaft. The vane shall be of a "Flow-Through" design incorporating three integral flow passages, in order to provide low flow resistance and assurance of high quality. Valve shafts shall be of two-piece stub shaft type, made of 18-8 Type 304 stainless steel with a diameter equal too or larger than specified for applicable valve class as defined by AWWA Standard C- 504, latest revision. Rubber Seats shall be capable of ready replacement or adjustment without the use of special tools. Shaft seals shall be of the "O-Ring" type.

C. OPERATOR

The operator shall be of the traveling nut or worm gear type, self-locking in any position and sealed, gasketed and lubricated as needed.

All valves shall close by turning the operator nut or handwheel in a clock-wise direction (Open left). The operator shall be capable of meeting the torque requirements for opening and closing the valve against the pressure and flow rate specified.

For underground service, the minimum number of turns to close valve shall be no less than 2 turns per inch of valve size in order to minimize water hammer; and stops shall be provided capable of absorbing up to 450 foot-pounds of input torque without damage to the valve or operator.

For above-ground service, the operator shall provide position indication; and shall require no more than 80 pounds pull on the handwheel to provide necessary torque for specified pressure and flow rate.

Cylinder Operator shall meet all applicable provisions of AWWA Standard C-504, latest revision.

D. END CONFIGURATIONS

Flanged-end valves shall be of the short-body type having 125# flanges conforming to ANSI B16-1. Mechanical joint end valves shall conform to AWWA Standard C-111 (ANSI B21.11). Mechanical joint bolts, glands and gaskets (shall)(shall not) be supplied by the valve manufacturer.

E. TESTS

All valves shall be tested for leakage at rated pressure, and tested hydrostatically at two times rated pressure-all in conformance with AWWA Standard C-504, latest revision.