Double check valve assembly retest after repairs outer valve 1st check valve 2nd check valve psid psid pass fail pass fail pass fail reduced pressure assembly 1st check valve. A double check valve assembly shall be installed at each noted loca tion. Awwa c51007 double check valve backflow prevention assembly. Install valve at least 12 inches above surrounding flood level.
Testing differential pressure, for backpressure, noflow status, and the. Backflow device test report service address name of premises location of device. The assemblies do not need to be of the same pipe size. Backflow prevention program specialistadministrator and. For technical assistance, contact your local watts representative on back page. The installation shall be made so that no part of the unit can be submerged. 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.
Establishing an effective crossconnection control program. Cross connection control and backflow prevention program. An approved doublecheck valve device is regarded as an assembly that meets the requirements of american water works association awwa standard for doublecheck valve backflow prevention assembly awwa c51092 or an assembly that has been approved by a testing laboratory sanctioned by the conference of state sanitary engineers. Backflow testing fire inspection software formlink systems. Rp, doublecheck valve dc, doublecheck detector dcda, reduced pressure principle. Water quality division, crossconnection control program.
The double check valve assembly dcva is essentially two single check valves assembled within one body and furnished with four test cocks and two shutoff valves. Failure to do so may result in a malfunctioning assembly. The foundations membership program provides many benefits to the members. State of ohio all applicable fields must be filled out completely in order for test results to be accepted facility name. Double check valve backflow prevention assembly form. Installation, operation, iomabpa maintenance and parts. The city of deer park has established a backflow testing program to help. Wilkins 950xlt2 top access double check valve assemblies.
One needs to look at the entire test in order to understand the reasoning. Because the code has been relaxed since then, homeowners have two choices for maintenance and upkeep. Series 709 is ideal at referenced crossconnections identified in nonhealth hazard. Double check valves have the redundancies you need to be sure the water supply will not become contaminated. Approved by the foundation for crossconnection control and hydraulic research at the university of. You need an alternate method to test double check valve assemblies. Lets look at a few other methods to test the double check valve assembly. The double check backflow device is a valve with two independent check valves that are. Bilink checks shall be removable and serviceable, without the use of special tools.
Double checks are commonly used to protect against low to medium hazard installations such as food processing equipment or lawn sprinkler systems. How to test a double check valve assembly with a three valve test kit. Always consult local codes for installation methods, approvals and guidance. Frequently asked questions about backflow prevention what is a. What if my backflow prevention assembly fails the test. Asse 1015 performance requirements for double check. Check with local authority having jurisdiction regarding vertical orientation, frequency of testing or other installation requirements. Backflow testing program deer park, tx official website. Ser vice of all internal components shall be through a. If the double check valve assembly does not have builtin union connections, cut the vertical pipes on the inlet and outlet side about four inches below the assembly. Watts 0387054 6 double check valve assembly 709 osy series 709 double check valve assemblies prevent the reverse flow of polluted water from entering into the potable water supply. Double check valve 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. Formlink systems offers secured software that stores your data safely, while giving your inspectors access to digitally submit the inspection results.
Separate the unions, apply thread sealant compound, and hand tighten. M200, m200n consists of two independently operating check valves, two shutoff valves, and four test cocks. Assembly shall be a colt c200, c200n as manufactured by the ames company. No differential on the test kit and no discharge from the relief valve b.
Chemigation valve used primarily in agriculture double check valve assembly dcva reduced pressure zone device. Section 6 crossconnection and backflow prevention program. If the downstream test cock is at the highest point. 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. Double check valve assembly backflow assemblies the.
The installation and maintenance of any ames backfl ow prevention assembly should be performed by a qualifi ed licensed technician. Looking for apollo double check valve assembly, lead free bronze, apollo 4alf100 series, fnpt connection 40d851. Most common types include the double check valve assembly, pressure vacuum breaker assemblies, and the reduced pressure assemblies. This feature is safe when testing hydraulic pumps, but creates a potential hazard when testing doubleacting cylinders and reversible motors. Colt tm series c200, c200n double check valve assemblies sizes. Fees and payment for backflow prevention assembly testing. This standard also applies to manifold double check backflow prevention assemblies consisting of two 2 or more complete double check backflow prevention assemblies in parallel. A double check valve or double check assembly dca is a backflow prevention device designed to protect water supplies from contamination. The assem bly shall consist of two positive seat ing check modules with cap tured springs and rubber seat discs. Handson skills refresher for backflow prevention assembly. The zurn wilkins 350ada double check detector backflow preventer is ideal for fire protection applications, with a metered bypass to detect leaks and unauthorized water use. He is a certified instructor in backflow testing, repair and surveying and holds instructor certifications in medical gas and industrial valve repair.
Differential pressure test utilizing a differential gauge. The assembly shall include flanged, full port resilient wedge shutoff valves and four full port ball valve testcocks, considered integral to the assembly. A secondary type of mechanical backflow preventer is the residential dual check valve. Before starting test, all needle valves and bleed valves on test kit must be closed. Under the program, customers share a joint responsibility and legal obligation to. Testing the double check valve assembly the foundation for. Double check valve assembly shall be constructed using lead free materials. The principal types of mechanical backflow preventer are the reducedpressure principle assembly, the pressure vacuum breaker assembly, and the double check valve assembly. Double checks are commonly used to protect against low to medium hazard installations such. Supply pressure gauge reading will decrease when performing this test procedure. Lead free double check valve assembly shall be constructed using lead free materials.
The double check valve assembly shall consist of two independent bilink check modules within a single housing, sleeve access port, four test cocks and two drip tight shutoff valves. Apollo 4a105a2f 4a105t2f 1 bronze double check valve. This standard covers the double check valve backflow prevention assembly. The wetted surface of this product contacted by consumable water contains less than 0. It has a modular check design for easy maintenance and epoxy coated fda approved cast iron body construction. Both integral shutoff valves shall include prewired supervisory tamper switches contained within a weatherproof actuator housing approved for both indoor and outdoor use. For other repair kits and service parts, send for plrpbpd and frkdc. Testing the double check valve assembly manual update.
Double check valve backflow prevention assembly how it. We dont know when or if this item will be back in stock. Specifications the double check valve assemblies shall consist of two independent trilink check modules within a single housing, sleeve access port, four test cocks and two drip tight shutoff valves. A certified backflow tester from the city of santa rosa tester list must test your. Unlike the double check valve assembly, the residential dual check valve does not contain test cocks and gate valves.
Apollo 4a105a2f 4a105t2f 1 bronze double check valve assembly backflow preventer w ball valves and sae threaded test cocks, 4a105a2f 4a105t2f 4a105t2 1 inch currently unavailable. Have the required testing done by a licensed plumber or replace the existing backflow assembly with a nontestable dual check valve and then replace that device every five years. Backflow prevention assembly testing manual concept 4 check valve to atmospheric and observing the upstream pressure at which the check valve closes. The check module seats and seat discs shall be replace able. Designed for use in nonhealth hazard crossconnections and continuous pressure applications subject to backpressure or backsiphonage incidents, such as lawn sprinklers, fire sprinkler lines, commercial pools, tanks and vats, and food cookers. Backflow prevention assemblies are used to protect water supplies from contamination or pollution. Order cross connection assembly identification tags doa document sales order multiply paper copies of cross connection test reports doa document sales sbd10605 affadavit of plumbing testing sbd10754 sbd10754 double checkdc detector performance test pdf double checkdc detector performance test fillin sbd10766 sbd10766. How to test a double check valve backflow preventer youtube. All double check valve assemblies shall be constructed all internal parts, including seat rings, can be serviced without removing the device from the line. This standard describes the double check valve backflow prevention assembly. Sample exam questions and recommended references for. Double check valve assemblies water specialties company. It shall comply with state codes and standards, where applicable, requiring reduced lead content. Double check valve assemblies, watts double check valve.
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