2008-276 D - Laserfiche WebLink

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B. Valves — All valves shall be true union ball valves, fabricated from PFA or CPVC. Seats shall be Teflon, and seals shall be PFA. O -rings shall be Viton. C. Pressure Sustaining Valve — See the plans for injection point. A back pressure valve shall be provided, mounted immediately before the discharge point. The back pressure valve body shall be fabricated from PVDF, with a Teflon diaphragm seal. The valve shall be manufactured by Prominent, Milton Roy, Pulsafeeder, or equal. Pump shall include wall mounted bracket, tote adapters, and flexible hoses as indicated on the drawings. 2.07 PLASTIC BALL VALVES A. Ball valves 1/2 " through 2" shall be double true union type, CPVC, or PVC (same material as pipe) fitted for intended service unless otherwise noted. Valves shall be solvent welded to piping system unless otherwise noted. Valves shall be Nibco Chemtrol, style TU. B. Multiport ball valves shall be Chemtrol MP type, with line unions and threaded branch. C. Ball check valves - Chemtrol BC series, double true union. 2.08 STAINLESS STEEL VALVES (2" size and less) A. Ball valves used for sulfuric acid service shall be Carpenter -20 S.S. alloy body, ball and stem with Teflon seats and seals. B. Regulating valves for throttling service for air, ammonia, and other gases Whitey Forged body regulating and shutoff valve, 316 stainless steel. C. Ball valves for gas services, Whitey Series 60, swing out style, 316 stainless steel body and ball, viton fitted cadmium plated handle. D. Shut off cocks for seal water, gauges, instruments, etc. Nupro plug valve, 316 stainless. E. Ball valves used for hydrofluorosilicic acid shall be Alloy C276 body, ball and stems with Teflon seats and stems. F. Check valves - ammonia service - spring loaded in-line check valve, similar to Nupro 16C series, 316 stainless steel 2.09 GATE VALVES A. Resilient seated gate valves shall be non -rising stem (NRS) type, conforming to the latest revision of AWWA Standard C-509. The gate valves shall be mechanical joint type, fully enclosed, and suitable for buried service complete with a cast bronze 2" operating nut that is independent of the stem and wedge. The body shall be of cast iron and fully encapsulated inside and outside with a fusion bonded epoxy coating conforming to the latest revision of AWWA Standard C-550. The wedge shall be cast iron and completely encapsulated with a resilient EPDM elastomer permanently bonded to the wedge and have a rubber -tearing bond 044572017 15100-7