Testing a double check valve

Testing differential pressure, for backpressure, No-Flow status, and the downstream shut off valve for tightness. CEU credit for Drinking Water and Waste Water Operators and well as certified . Please view these videos if you need any help wi. Assemblies Using Differential Pressure Gauge. Check valves shall be loaded so that when the supply pressure is at least 1.

BLEED TEST PORTS TO REMOVE ANY DEBRIS.

In this case the tester would note that the check valve is holding.

Connection Control, Tenth Edition includes field test procedures for backflow prevention assemblies, one of which is the double check valve backflow prevention assembly (DC). The field test procedure found in the manual for the DC allows the backflow prevention assem- bly tester . Manual Update continued on page three. Larger check valves may be installed with ball valves at the ends, for isolation and testing.

Often, test cocks (very small ball valves) are in place to attach test equipment for evaluating whether the double check assembly is still functional. The double check valve assembly is suitable for prevention of back pressure and back . Emanating water from the valve indicates that the first check valve is most likely fouled and needs to be serviced before you can continue. Exiting water from the double check valves , however, are not indicative of any . The Green Industry News presents Brandon Burgess with Irrigator Technical Training School as he demonstrates the test procedures for the Double Check Backflo.

All other requirements are the same as the. Check with the local water purveyor for . Obtain permission to shut off the water supply. PROCEDURE IS ACCPTED BY LOCAL AUTHORITIES. The TK-9A is easily connected to any RPZ device enabling accurate testing of zone differential pressure, relief . Determine the direction of flow.

EXCERPT - Field Testing Backflow Preventers, Instructional Video - Duration: 5:45. Mayfair Plumbing perform the annual test on this valve . Initial arrangements shall be made with the responsible party to schedule the test. INSTALLATION and TESTING REQUIREMENTS. Backflow prevention keeps your drinking water safe by keeping potentially contaminated water. RP), double check valve backflow prevention assembly (DC), pres- sure vacuum breaker assembly (PVB) and for the first time ever the spill-resistant pressure vacuum breaker assembly (SVB).

Both check valves are designed at an inclined angle upward from the horizontal centerline of the assembly, and all test cocks are mounted at the top to assure easy . A spring-loaded internal check valve is sited either side of the test cock and an arrow identifies the direction of flow. Double Check Valves ensure the prevention of contamination arising from back syphonage, back flow and cross connection. The low headloss design and fast installation time make this unit the . Select products are included below.