Page 7 of Water Regulators and Blackflow Preventers & Meters by Duff Company

regulators-backflowpreventers-meters watts backflow preventers watts 909 provides protection in cross-connection control and containment for cold and hot water installations furnished with npt connections and quarter-turn full port resilient seated bronze ball valve 175 psi 140of bronze body construction modular design replaceable seats ball valve test cocks easily serviced with no special tools captured spring assemblies with bronze strainer size length weightw fig no price strainer 3/4 1 1 1/4 1 1/2 2 21 1/4 22 1/4 25 5/8 27 3/16 30 3/4 15 5/8 17 1/2 42 3/4 44 473/8 8643 8644 8645 8646 8647 duff co watts 909 sizes 2 1/2 to 10 air in/water out principal provides high capacity relief valve discharge during the emergency conditions of combined back-siphonage and back pressure with both checks fouled epoxy coated cast iron check valve body with bronze seats 175 psi to 140of removable bronze seats stainless steel internal parts easily serviced with no special tools captured spring assemblies size 2 1/2 3 4 6 length 41 1/4 42 1/4 55 1/8 65 1/2 wght w strainer 195 225 455 718 fig no 22778 22777 29948 29949 price watts 009 protection of the potable water supply for high hazard cross-connections for containment at the service line entrance two inline independent check valves with an intermediate relief valve modular construction replaceable seats captured springs no special tools required for servicing top access single cover with bronze strainer size length wght w fig no price strainer 1/2 3/4 1 1 1/4 1 1/2 2 13 19 1/4 22 1/2 26 5/8 28 5/8 31 1/2 5 1/2 15 15 1/4 31 35 43 61590 50517 51054 61591 61592 50518 watts 909 90o elbow watts 909 air gap usedwith series 909 air gap for connections to 1/2 3 backflow preventers on vertical installations size 3/4 -1 1 1/4 -2 used with series 909 and 009 series backflow preventers on horizontal installations can be easily mounted to body size fig no 29943 24414 29946 price fig no 29944 29945 price 3/4 -1 1 1/4 -3 4 -6 watts n36 vacuum relief valve for water service automatically vents a system if vacuum occurs opens at less than 1/2 vacuum automatic venting of a closed system to atmosphere when a vacuum is created thereby permitting air to enter and prevent vacuum conditions which could siphon the water from the system and burn out a heater or collapse a tank also suitable for steam service max pressure 15 psi size weight fig no price 1/2 3/4 3/8 lb 3/4 lb 45181 45182 watts backflow preventer test kit for testing all reduced pressure zone backflow preventers accurate testing of zone and relief valve opening differential fouled check valves or similar problems that visual inspections cannot locate 175 psi 210of fig no 8650 price page 359 for additional information call 610-275-4453 or fax 610-279-6299 prices are a guide only please call for current prices.

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