Triton Rubber Seated Butterfly Valve Spec Sheet
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All butterfly valves shall be of the tight closing, rubber seated type and fully comply with the latest revision of AWWA Standard C504, Class as required, and NSF61 where applicable. Valves shall be bubble-tight at rated pressure class in either direction, and shall be satisfactory for applications involving throttling service and for applications requiring valve actuation after long periods of inactivity. Valve discs shall rotate 90º from the full open position to the tight shut position. Regardless of valve size, angular misposition of disc can be up to one degree off center without leakage.
The manufacturer shall have manufactured tight closing, rubber-seated butterfly valves for a period of at least ten years. All valves from 24" through 72" shall be the Triton XR‑70 as manufactured by the Henry Pratt Company or an approved equal. All valves from 78" and larger shall be the Triton XL as manufactured by Henry Pratt Company or an approved equal.
All valve bodies shall be cast iron ASTM A126, Class B, narrow body design. Flange drilling shall be in accordance with ANSI B16.1 standard for cast iron flanges. Body thickness shall be in strict accordance with AWWA C504 where applicable.
All valve discs shall be constructed of either cast iron ASTM A48, Class 40 with a stainless steel seating edge or ductile iron ASTM A536 with a stainless steel seating edge. The disc shall not have any hollow chambers that can entrap water. All surfaces shall be visually inspected and measurable to assure all structural members are at full disc strength. Disc and shaft connection shall be made with stainless steel pins.
All shafts shall be turned, ground, polished and constructed of 18-8 Type 304 or Type 316 stainless steel. Shafts shall be two-piece, stub type and keyed for actuator connection. Shaft diameters shall meet minimum requirements established by the latest revision of AWWA Standard C504 for their class, where applicable.
All seats shall be constructed of synthetic rubber compound such as Buna N or EPDM and suitable for bi-directional shutoff at rated pressure. Seats shall be retained in the valve body by mechanical means without retaining rings, segments, screws or hardware of any kind in the flow stream. Seats shall be a full 360º without interruption and have a plurality of grooves mating with a spherical disc edge seating surface. Valve seats shall be field adjustable around the full 360º circumference and replaceable without dismantling the actuator, disc or shaft and without removing the valve from the line.
All butterfly valves shall be fitted with sleeve-type bearings. Bearings shall be corrosion resistant and self-lubricating. Bearing load shall not exceed 1/5 of the compressible strength of the bearing or shaft material.
Valve actuators shall conform to AWWA Standard C504 and shall be designed to hold the valve in any intermediate position between full open and fully closed without creeping or fluttering.
All surfaces of the valve shall be clean, dry and free from grease before applying paint or coating. The valve interior and exterior surfaces, except for the seating surfaces, shall be provided with the manufacturer's standard unless otherwise specified by contract.
Hydrostatic and leakage tests shall be conducted in strict accordance with AWWA Standard C504.
Proof of Design
The manufacturer furnishing the valves under the specification shall be prepared to show proof that the valves provided meet the design requirements of AWWA Standard C504.