Learning the Basics
One Hose Test Procedure
DC 5 Value Test Gauge
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Field Testing Requirements
Flush Test Cocks (TC)
Step #1 - Install gauge adapters (if applicable)
Step #2 - Open TC #4 and flush then let trickle
Step #3 - Open TC #3 and flush and close
Step #4 - Open TC #2 and flush and close
Step #5 - Open TC #1 and flush and close
Step #6 - Now Close TC #4
Attach Test Kit
Step #1 - Close gauge manifold control valve and low-pressure bleed
Step #2 - Open gauge high bleed valve
Step #3 - Open TC #2 with trickle flow and attach gauge high-pressure hose
Bleed out all the air or you may get a false reading.
Step #4 - Close gauge high-bleed valve and open TC #2 slowly and fully
Test #1 – Check Valve #1 Differential
Step #1 - Close shut off #2 then close shut off #1
Step #2 - Slowly and fully open TC #3
Step #3 - When water stops flowing from TC #3 record the gauge for check valve #1
-- Test Results --
Record the pressure differential across #1 check valve.
If the differential reading is 1,0 pisd or above,
record #1` check Value is tight.
Test #2 – Check Valve #2 Differential
Step #1 - Reestablish pressure to assembly open Shut off #1.
Step #2 - Open TC # 3 with trickle flow and attach gauge High-pressure hose
Bleed out all the air or you may get a false reading
Step #3 - Close gauge high bleed valve and open TC #3 fully
Step #4 - Close shut off #1 or close TC #2 to isolate the supply flow
Step #5 - Slowly and fully open TC #4
Step #6 - When water stops flowing from TC #4, record the gauge
Step #7 - Close TC #3 and TC #4.
Step #8 - Reestablish assembly to pre-test condition.
Step #9 - Remove high-pressure hose
-- Test Results --
Record the pressure differential across #2 check valve.
If the differential reading is 1.0 pisd or above, record #2 check valve as tight.
DC - One Hose test Procedure
Wilkins Assemblies
Watts Assemblies
The Watts 007/007M1/007M2/007M3 is a double check valve assembly ( DCA ) It is available in ½” – 2” sizes and has been in production since 1989. The body is made of bronze. The 007M1 series was introduced in 1991 (3/4” & 1”) and 1993 ( 1 ¼” – 2”). The 007M2 series was introduced in 1993 (3/4”) and 1994 (1 ¼” & 1 ½”). The 007M3 debuted in 1998 (3/4”). A lead free version was introduced in 2010 (LF007).
The Wilkins 350 is a double check valve assembly ( DCA ). It is available in ¾” – 2” sizes and has been in production since 2004. The body is made of reinforced nylon with a bronze carriage. A lead free version was introduced in 2010 (350XL).
Double Check Valve Backflow Prevention Assembly - How It Works
Wilkins DC Detector
The Wilkins 950XLTDA is a double check detector assembly ( DCDA ). It is available in a 2” sizes and has been in production since 2013. The body is made of bronze. The 950XLTDA utilizes a 350D as its bypass assembly.