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2 ½" – 4" Deringer 20G/30G Maintenance Instructions
READ INSTRUCTIONS IN FULL BEFORE INSTALLATION.
QUESTIONS? CALL 916-760-4524 M-F 8:00 AM – 4:30 PM PST
At Backflow Direct we are committed to making our products as easy to install as possible. We design for
most contingencies, but installation may be different based on your regional regulations or system design.
We are continually improving our products and instructions – please help us by providing recommendations
as to how we can improve or products or instructions.
If you have any difficulties at all, please give us a call. Thank you for purchasing our product!
IMPORTANT NOTE: We use Stainless Steel Hardware where possible. Therefore, it is best to have Silver Anti-
seize available to use on all non-wetted bolts—only a small amount is needed.
WARRANTY INFORMATION: Please visit our website for our official warranty www.backflowdirectwarranty.com
REV: A | 10/09/2018 | BD-INST-20G30G
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Summary of Contents for Backflow Direct Deringer 20G
- Page 1 QUESTIONS? CALL 916-760-4524 M-F 8:00 AM – 4:30 PM PST At Backflow Direct we are committed to making our products as easy to install as possible. We design for most contingencies, but installation may be different based on your regional regulations or system design.
- Page 2 Wood Block – 1” x 2” x 16” QUESTIONS: Please call us at 916-760-4524 M-F 8:00 AM – 4:30 PM PST or email us at techhelp@backflowdirect.com Page 2 of 19 BD-INST-20G30G | Rev A | 10/09/2018 | Copyright 2011 Backflow Direct, LLC...
- Page 3 Slowly rotate Shut-Off Valve #2 Handle (B) to the closed position. Stem concealed (A). Slowly rotate Shut-Off Valve #1 Handle (C) to the closed position. Stem concealed (B). Page 3 of 19 BD-INST-20G30G | Rev A | 10/09/2018 | Copyright 2011 Backflow Direct, LLC...
- Page 4 Using the Backflow Direct test cock wrench or a small adjustable wrench open Main Test Cock Number 2. Page 4 of 19 BD-INST-02030 | Rev E | 05/30/2017 | Copyright 2011 Backflow Direct, LLC BD-INST-20G30G | Rev A | 10/09/2018 | Copyright 2011 Backflow Direct, LLC...
- Page 5 Remove access port cover plate (C). Do not remove Access Port O-ring (D). Page 5 of 19 BD-INST-02030 | Rev E | 05/30/2017 | Copyright 2011 Backflow Direct, LLC BD-INST-20G30G | Rev A | 10/09/2018 | Copyright 2011 Backflow Direct, LLC...
- Page 6 Module in the downstream direction until the First Check Module can easily be removed from the access port by hand. FLOW Page 6 of 19 BD-INST-02030 | Rev E | 05/30/2017 | Copyright 2011 Backflow Direct, LLC BD-INST-20G30G | Rev A | 10/09/2018 | Copyright 2011 Backflow Direct, LLC...
- Page 7 Module in the upstream direction until the Second Check Module can easily be removed from the access port by hand. FLOW Page 7 of 19 BD-INST-02030 | Rev E | 05/30/2017 | Copyright 2011 Backflow Direct, LLC BD-INST-20G30G | Rev A | 10/09/2018 | Copyright 2011 Backflow Direct, LLC...
- Page 8 Reverse order above instructions to reassemble By-Pass Check Valve. Page 8 of 19 BD-INST-02030 | Rev E | 05/30/2017 | Copyright 2011 Backflow Direct, LLC BD-INST-20G30G | Rev A | 10/09/2018 | Copyright 2011 Backflow Direct, LLC...
- Page 9 Reverse the order of the instructions on the previous page to reassemble Bypass Check Assembly. Page 9 of 19 BD-INST-02030 | Rev E | 05/30/2017 | Copyright 2011 Backflow Direct, LLC BD-INST-20G30G | Rev A | 10/09/2018 | Copyright 2011 Backflow Direct, LLC...
- Page 10 5. Reverse order of above instructions to reinstall Bypass Meter. Remember install Gaskets (F) before threading Meter Coupling Nuts into place. Page 10 of 19 BD-INST-02030 | Rev E | 05/30/2017 | Copyright 2011 Backflow Direct, LLC BD-INST-20G30G | Rev A | 10/09/2018 | Copyright 2011 Backflow Direct, LLC...
- Page 11 Disk Retainer Screws (F). • Do not cross thread Disk Retaining Screws (F). Page 11 of 19 BD-INST-02030 | Rev E | 05/30/2017 | Copyright 2011 Backflow Direct, LLC BD-INST-20G30G | Rev A | 10/09/2018 | Copyright 2011 Backflow Direct, LLC...
- Page 12 Page 12 of 19 BD-INST-02030 | Rev E | 05/30/2017 | Copyright 2011 Backflow Direct, LLC BD-INST-20G30G | Rev A | 10/09/2018 | Copyright 2011 Backflow Direct, LLC...
- Page 13 Disk Retainer Screws (F). • Do not cross thread Disk Retaining Screws (F). Page 13 of 19 BD-INST-02030 | Rev E | 05/30/2017 | Copyright 2011 Backflow Direct, LLC BD-INST-20G30G | Rev A | 10/09/2018 | Copyright 2011 Backflow Direct, LLC...
- Page 14 In order to maintain the performance of the valve pay attention to the proper orientation of the check module. Page 14 of 19 BD-INST-02030 | Rev E | 05/30/2017 | Copyright 2011 Backflow Direct, LLC BD-INST-20G30G | Rev A | 10/09/2018 | Copyright 2011 Backflow Direct, LLC...
- Page 15 Important Note: Recommended Torque for the Check Retainer Bolts is 50 Ft. Lb. Page 15 of 19 BD-INST-02030 | Rev E | 05/30/2017 | Copyright 2011 Backflow Direct, LLC BD-INST-20G30G | Rev A | 10/09/2018 | Copyright 2011 Backflow Direct, LLC...
- Page 16 Important Note: Recommended Torque for the Check Retainer Bolts is 50 Ft. Lb. Page 16 of 19 BD-INST-02030 | Rev E | 05/30/2017 | Copyright 2011 Backflow Direct, LLC BD-INST-02030 | Rev E | 05/30/2017 | Copyright 2011 Backflow Direct, LLC...
- Page 17 4. Use Ratchet Wrench (G) to sequentially tighten all Cover Bolts (D) alternating from one side of the valve to the other. Page 17 of 19 BD-INST-02030 | Rev E | 05/30/2017 | Copyright 2011 Backflow Direct, LLC BD-INST-20G30G | Rev A | 10/09/2018 | Copyright 2011 Backflow Direct, LLC...
- Page 18 Bypass Check Valve Cover is Tightened (F) • Bypass Meter Coupling Nuts are Tightened (G) Page 18 of 19 BD-INST-02030 | Rev E | 05/30/2017 | Copyright 2011 Backflow Direct, LLC BD-INST-20G30G | Rev A | 10/09/2018 | Copyright 2011 Backflow Direct, LLC...
- Page 19 Slowly rotate Shut-Off Valve #1 Handle (C) to the open position. Stem exposed (B). FLOW Open Closed Page 19 of 19 BD-INST-02030 | Rev E | 05/30/2017 | Copyright 2011 Backflow Direct, LLC BD-INST-20G30G | Rev A | 10/09/2018 | Copyright 2011 Backflow Direct, LLC...
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