Double detector check valve pdf

Pitvault nontraffic area pit shall be reinforced castinplace concrete, precast concrete, or laid block. The 350ada utilizes grooved couplings for the attachment of the shutoff valves. The list of approved backflow prevention assemblies is published by the foundation for crossconnection control and hydraulic research. The ar series drastically reduces installation and system down time. Series 709dcda double check detector assemblies watts water.

With the features of a detector check and a double check valve assembly, model doc ii controls crossconnec tions that do not present a health hazard, while also detecting leakage or unauthorized water user in fire or sprinkler systems. Some reduced pressure 0 5 10 15 centerline of the gage should be level with the water level in the tube test no. The double check detector assembly dcda is an outgrowth of the double check valve and is primarily utilized in fire line installations. Oct 15, 2019 300 water system standard details pdf 24 pages last updated 10152019. Specifications detector check shall consist of a single. They incorporate a meter to detect ground leaks and unauthorized illegal taps, greatly reducing annual water expenses.

Standard details for water savannah, ga official website. Double detector check valve assemblies model parkusa. The main body and access cover shall be epoxy coated ductile iron astm a 536, the seat ring and check valve shall be noryl, the stem shall be stainless steel astm a 276 and the seat disc. Victaulic series 415 double disc check valve check flow. Double check valves and double detector check valves installed in fire protection systems a copy of this completed test must be attached to or located near the double check valve or double detector check valve. Available in multiple configurations and material construction. Double check detector valve 21 2 to 10 approvals asse, awwa ul classified osy only, fm a double check valve assembly shall be installed at each noted location to prevent the unwanted reversal of polluted water into the potable water supply. Water main crossing other utilities notes section 03.

Double check valve assemblies shall be tested at one psi in the direction of flow by. The single check and single detector check valve assembly backflow preventer protects against backflow by either backpressure or backsiphonage from a crossconnection between potable water systems and substances in low hazard conditions in fire sprinkler systems. A double check valve or double check assembly dca is a backflow prevention device designed to protect water supplies from contamination. This assembly consists of a main line double check valve assembly and attached bypass piping that includes a water meter and a bypass double check valve assembly. Double check valves viking supplynets extensive inventory of backflow valves and related devices includes leading products from wilkins, ames, watts, and. Understanding detector assemblies usc foundation for cross. Double check valve assemblies double check valve assemblies shall be tested at one psi in the direction of flow by. Therefore, the mainline check valve remains closed so that low flows through the fireline system are registered by the bypass meter. Its purpose is to protect the potable water supply line from possible contamination or pollution from the fire system, backpressure from fire line booster pumps, stagnant black water that sits in fire lines. Reduced pressure backflow preventer assemblies in a low condition, the check valves are open.

Double check detector assembly fire sprinkler, system supply main. The deringer 30 double check detector assembly dcdaii shall utilize two independent dual action check modules and two integral resiliently seated shutoff valves all of which shall be contained within a single rigid valve housing constructed entirely of 304 stainless steel. Backflow prevention assembly testing manual concept 4 check valve to atmospheric and observing the. Mueller canada offers several types of check valves including. For additional types of check valves, please visit. The 350da utilizes shutoff valves that are attached to the main body via flanges. Designed to replace old, long lay length double check detector assemblies. This catalog is presented to assist our customers, design engineers. Double detector check valve backflow preventer 6, 8. The double check detector backflow prevention assembly shall be a zurn wilkins model 350da.

Saws construction specifications updated march 3, 2017 applicable for projects advertised for bids after feb. Double check valve assembly dc double check detector assembly dcda. Double check valve assembly and double check detector assembly procedure requirements. Double check detector assemblieswatts double check detector.

Double check detector assemblies, cast iron 709dcda watts. Detects leaks and unauthorized use of water 700xl 700xlfp 705 dual check residential supply lines and fire sprinkler systems 760 dual check with atmospheric vent boiler feed lines, laboratory equipment, residential 40xl2 inline springloaded check valve irrigation, pump and water. It consists of a lead free cast copper silicon alloy 12 to 2 in or fused epoxy coated cast iron 2 12 to 3 in. It is different from the twoway check valves sometimes erroneously referred to as double check valves used in air brake systems on heavy trucks which select from the highest pressure source. Series lf007 lead free double check valve assemblies prevent the backflow of contaminated water into the potable water supply. Valves provided for each sprinkler system shall be outside indicating. It incorporates a meter to detect ground leaks and unauthorized. Dec 24, 2019 the double check valve detector assembly shall be designed for firelines to prevent backflow from the fire protection system to the potable water system and also detect leakage or unauthorized use. The bypass line double check valve shall have two independently operating modular poppet check valves, and top mounted test cocks.

The double check detector backflow prevention assembly shall be certified to nsfansi 61, asse listed 1048, and supplied with full port gate valves. Double check valve assemblyddc or dcva this assembly consists of two internally loaded check valves, either spring or internally loaded, weighted, installed as a unit between two tightly closing resilientseated shutoff valves as an assembly, and fittings with properly located resilient seated test ports or cocks. This list is available through the department of heath, 360 2363140. The proper installation of a backflow preventer must be done by a certified expert under local codes and guidelines to assure. Apollo backflow prevention devices are designed to prevent contamination of the potable water supply due to backsiphonage or backpressure from substances that are hazardous, or objectionable but nonhealth hazards. Certain models have a meter to detect ground leaks and unauthorized illegal taps. Complete line of backflow preventers and pressure regulating valves. If the second check is prevented from closing tightly, the first valve still protects from backflow. Series 709dcda double check detector assemblies prevent backflow of nonhealth hazard fire protection system substances from being pumped or siphoned into the potable water supply. Flows in excess of approximately 10 gpm will open the mainline check valve causing flow to occur through the mainline assembly and the bypass line.

Double check detector assemblies 007dcda watts free bim. Double check detector assembly backflow assemblies the. Detector check for automatic fire sprinkler systems. Features a modular design concept which facilitates complete maintenance and assembly by retaining the spring load. Its compact epoxy coated cast iron unibody and modular check design facilitate simple and easy. Test procedures for double check valve and double check. Therefore, due to the elimination of the flanges, the 350ada is lighter in weight than the 350da. The proper selection of a backflow preventer is crucial to ensure that.

The bypass assembly consists of a water meter and an approved double check valve assembly with shutoff valves and test cocks. Wilkins double check detector assemblies 56 products. Minimum requirements for passing test dc and dc detector the first check must close tight and have a minimum static 1 psid. Available with grooved ends for installation in either strengthin systems or original grooved systems ogs. The beecofriendly double check backflow preventer valve is designed to stop the reverse of flow of a liquid into a potable water system. With the features of a detector check and a double check valve assembly, model doc ii controls crossconnec. Shutoff valve designation detector assembly meters special notices atmospheric vacuum breaker avb double check valve assembly dc double check detector assembly dcda double check detector assemblytype ii dcdaii pressure vacuum breaker assembly pvb reduced pressure principle assembly rp reduced pressure principle detector assembly. More than one riser may be fed off of one double check valve detector assembly. The device is constructed from ductile iron 654512.

Double check detector assemblies are designed to prevent backflow of nonhealth hazard substances from being pumped or siphoned into the potable water supply. Fdc 2 12 thru 10 double check backflow assemblies specification. Lf without shutoff valves osy ulfm outside stem and yoke resilient seated. List of approved backflow prevention assemblies 26 march 2020. The mainline consists of two independent spring loaded poppettype check valve assemblies mounted in a. The first and second check valves shall be accessible for maintenance without removing the device from the line. W14d double detector check valve assembly for fire system 3 and. Mueller 212 swing type gravity operated check valve flxfl maximum working pressure. Victaulic series 415 double disc check valve check flow control. The 350ada and the 350da are both double check detector assemblies. Febcos backflow prevention assemblies, which prevent the backward.