Description No. 1 Check
Valve
No. 2 Check
Valve
Relief Valve
1.
Isolating Gate Valve(s) Passing Water
2.
Foreign Matter Introduced During Construction
3.
Sand or Grit Inherent to the Supply System
4.
Copper Filings Solder or Pipe Dope
5.
Nuts, Bolts, Washers, etc. (not from assembly)
6.
Paper, Cardboard or Sawdust
7.
Improper Assembly Installed
N/A N/A
8.
Kinking of External Sensing Line
9.
Air Entrapment
10.
Turberculation or Rust
11.
Frozen Assembly
12.
Abnormal Rubber Disc Wear or Cuts
13.
Spring(s)
14.
O Ring(s)
15.
Loss of Interior Coating
16.
Disc Retainer (Fractured or Worn)
17.
Retain Nut
18.
Improper Casting or Machining of Assembly
19.
Guide Mechanism
20.
Obstructed Sensing Line
N/A N/A
21.
Diaphragm Failure
N/A N/A
22.
Replace Rubber Parts
23.
Test Cock(s) Missing from Assembly
N/A
24. Improper (Unapproved) Installation
25.
Assembly no Longer Required
26.
Assembly Replaced
27.
Couldn’t Test (Explain below)
28.
Vertical Installation Yes
No
N/A N/A N/A
29.
Remarks
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Check Causes for Backflow Preventor Failing Initial Test
Other (please specify)
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