Recommended Specifications

• Valves shall conform to the latest revision of AWWA Resilient Seated gate valve Standard C-509, be UL listed and FM approved for service to 250 PSI, cold water, non-shock water works service and 200 PSI fire protection service. Flanges drilled to ANSI B-16.1 (125#).
• All internal parts shall be accessible without removing the body from the line.
• The wedge shall be of cast iron completely encapsulated with resilient material. The resilient sealing material shall be permanently bonded to the cast iron wedge with a rubber tearing bond to meet ASTM D 429.
• NRS stems shall be cast bronze with internal collars in compliance with AWWA. OS&Y stems shall be bronze. There shall be two "O" Ring seals above the thrust collar and one "O" Ring below the thrust collar. The two "O" Rings above the thrust collar shall be field replaceable without removing the valve from service. The third "O" Ring below facilitates such field replacement.
• There shall be low friction thrust bearings above and below the stem collar. The stem nut shall be independent of the wedge and of solid bronze. The waterway in the seat area shall be smooth, unobstructed and free of cavities.
• Stuffing box shall be attached to the bonnet and bonnet to the body with bolts and nuts. Blind bolts threaded directly into the body or bonnet will not be acceptable.
• The body and bonnet shall be coated interior and exterior with fusion bonded thermosetting plastic.
• Each valve shall be hydrostatically tested at 500 PSI.