MidWest Instruments


TEST YOUR SKILLS | JULY 2018

1 Comment
 07 Aug 2018   Posted by BP Journal


In this issue’s installment, we will look at Double Check Valve Assemblies. How do they work? What protection do they provide? What are the installation issues? Let’s dig a little deeper into this part of the cross-connection puzzle. It’s time to pick up your pencil and test your knowledge.

If you have any comments, questions or suggestions please contact Backflow Prevention Journal’s Technical Editor Sean Cleary at sean.cleary@iapmo.org.

July 2018

The minimum pressure differential across either the first or second check valve in a Double Check Valve Assembly in a static condition according to the AWWA C510 Standard is:
A Double Check Valve Assembly provides:
The Double Check Valve Assembly product standard which requires both laboratory and field testing before approval is the:
According to the 2018 Uniform Plumbing Code Double Check Valve Assemblies shall be installed a minimum of:
Shutoff valves installed on Double Check Valve Assemblies must be:
Double check valves shall be installed:
According to the 2018 Uniform or International Plumbing Codes, Double Check Valve Assemblies are approved protection on irrigation systems:
According to the ASSE 1015 Product Standard, Double Check Valve Assemblies maximum pressure loss thru the assembly during rated flow is:
When testing a Double Check Valve Assembly using the USC 10th Edition field test procedure the first component tested is the:
When field testing a Double Check Valve Assembly using the ASSE field procedure the first component tested is the:
The number of test cocks on a Double Detector Check Valve Assembly is:
According to the 2018 Uniform Plumbing Code, Double Check Valve Assembles can be used on fire protection systems containing glycol provided it is non-toxic propylene glycol.
The number of check valves in a Type Two Double Check Detector Assembly is:
According to the NFPA 13 Installation Standard, shut off valves for Double Check Valve Assemblies installed on fire protection systems shall be:
Both the ASSE 1015 Standard Double Check Valve Assemblies and ASSE 1024 Standard Dual Check Valves are approved for low hazard backpressure and backsiphonage protection.
American Backflow Products


1 Comment

Mike Arnold
6 years ago



I am still learning. Confucius, Yogi Berra or Michelangelo ?