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Backflow Direct Deringer 20, Maintenance Instructions Manual, Page: 2 / 20

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Backflow Direct Deringer 20 Maintenance Instructions Manual Download Page 2

4X”- 6” Deringer 20/30 Maintenance Instructions

BD-INST-4X2030  |  Rev A  |  09/06/2019  |  Copyright 2011 Backflow Direct, LLC

Page 2 of 20

Tools Required: 

This list is the recommended tools for ease of installation. Other versions of the same tool can be used. For 

example, Allen Wrenches instead of Allen Drive Sockets.

QUESTIONS:  Please call us at 916-760-4524 M-F 8:00 AM 

– 4:30 PM PST or email us at 

[email protected]

#2 Philips Head Screwdriver

#2 Flathead Screwdriver

Adjustable Wrench

Ratchet

Wood Block -

2” x 4” x 5”

Wood Block 

– 1” x 2” x 16”

Backflow Direct Test Cock Wrench

Expanding Pipe Pliers

15/16” Socket

1 1/8” Socket

Summary of Contents for Deringer 20

Page 1: ...s 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 w...

Page 2: ...r versions of the same tool can be used For example Allen Wrenches instead of Allen Drive Sockets QUESTIONS Please call us at 916 760 4524 M F 8 00 AM 4 30 PM PST or email us at techhelp backflowdirect com 2 Philips Head Screwdriver 2 Flathead Screwdriver Adjustable Wrench Ratchet Wood Block 2 x 4 x 5 Wood Block 1 x 2 x 16 Backflow Direct Test Cock Wrench Expanding Pipe Pliers 15 16 Socket 1 1 8 S...

Page 3: ...A 2 Slowly rotate Shut Off Valve 1 Handle C clockwise to the closed position Flag perpendicular to flow A Note When yellow orange position indicator flags are parallel with the flow of water the shut off valves are in the open position Before doing any maintenance be sure the yellow or orange flow indicators flags are perpendicular to the flow of water and valve body indicating shut off valves are...

Page 4: ...is open when wrench flats are parallel to water flow through test cock 3 Using a 2 Flathead Screwdriver open Bypass Test Cock Number 2 Test Cock is open when screwdriver slot is parallel to water flow through test cock B 4 Using the Backflow Direct test cock wrench or a small adjustable wrench open Main Test Cock Number 3 5 Using a 2 Flathead Screwdriver open Bypass Test Cock Number 1 6 Using the ...

Page 5: ...n all eight bolts on the access port cover plate A 2 Remove bolts and tapered washers B and store in a safe place Be careful not to lose tapered washers as the access cover will not seal properly without the tapered washers 3 Remove access port cover plate C Do not remove Access Port O ring D B C A BD INST 4X2030 Rev A 09 06 2019 Copyright 2011 Backflow Direct LLC Page 5 of 20 D ...

Page 6: ...ts from valve body Merely loosen the bolts until the ends of the bolts are flush with the inner wall of the valve body B This allows for easy removal of Check Modules 2 Insert a flathead screwdriver between the inner valve body and the First Check Module Flange C gently coax the First Check Module in the downstream direction until the First Check Module can easily be removed from the access port b...

Page 7: ...ve check retainer bolts from valve body Merely loosen the bolts until the ends of the bolts are flush with the inner wall of the valve body B 2 Insert a flathead screwdriver between the inner valve body and the Second Check Module Flange C gently coax the Second Check Module in the upstream direction until the Second Check Module can easily be removed from the access port by hand A A C BD INST 4X2...

Page 8: ... to remove 2 Examine Cover Plate O ring B for damage or fouling 3 Remove Spring C 4 Remove Check Poppet Assembly D and examine for damage or fouling 5 Examine seat cage E for damage or fouling to the Sealing Seat Do not remove unless the seat cage is being replaced 6 Reverse the order of above instructions to reassemble By Pass Check Valve B C D BD INST 4X2030 Rev A 09 06 2019 Copyright 2011 Backf...

Page 9: ...r to remove the Disk Retaining Screw A 2 Remove Disk Retaining Washer B 3 Use a Flathead Screwdriver to remove the gasket from Poppet Cavity C 4 Install new Red Silicone Poppet Disk D 5 Reverse the order of the above instructions to reassemble Check Poppet Assembly 6 Reverse the order of the instructions on the previous page to reassemble Bypass Check Assembly A A C D B BD INST 4X2030 Rev A 09 06 ...

Page 10: ...st Cock 1 D Test Cock is open when screwdriver slot is parallel to water flow through Test Cock 3 Using a large wrench or adjustable pliers unscrew and retract Bypass Meter Coupling Nuts E Remove the Gaskets F on both sides of Bypass Meter 4 Gently remove Bypass Meter G from line It is OK if the bypass fittings move slightly during the removal process 5 Reverse order of above instructions to reins...

Page 11: ...ck Seat E for fouling or damage 3 Should Elastomer Disk D need replacement unscrew Disk Retainer Screws F and remove Disk Retainer G Carefully remove and replace Elastomer Disk D When replacing Elastomer Disk D be certain that no air water or debris is trapped in the Clapper H cavity behind the Elastomer Disk D A BD INST 4X2030 Rev A 09 06 2019 Copyright 2011 Backflow Direct LLC 4 Reverse the orde...

Page 12: ... Action Check Module BD INST 4X2030 Rev A 09 06 2019 Copyright 2011 Backflow Direct LLC Page 12 of 20 Note The diagram below shows the correct orientation of the First Dual Action Check Module when being re attached to the seat In order to maintain the performance of the valve pay attention to the proper orientation of the check module ...

Page 13: ...ained during maintenance 2 After removing the Tower Screws A Examine the Elastomer Disk D and Check Seat E for fouling or damage 3 Should Elastomer Disk D need replacement unscrew Disk Retainer Screws F and remove Disk Retainer G Carefully remove and replace Elastomer Disk D When replacing Elastomer Disk D be certain that no air water or debris is trapped in the Clapper H cavity behind the Elastom...

Page 14: ... Action Check Module BD INST 4X2030 Rev A 09 06 2019 Copyright 2011 Backflow Direct LLC Page 14 of 20 Note The diagram below shows the correct orientation of the Second Dual Action Check Module when being re attached to the seat In order to maintain the performance of the valve pay attention to the proper orientation of the check module ...

Page 15: ...he Second Check Seat Ring G Using a 1 x4 piece of wood cut to 16 length H as a lever between Access Port Wall the 2 x4 F gently coax the Second Check Module A into its fully seated position 3 Be certain Second Check Module A is fully seated and Check O ring E is NOT fish mouthed or damaged 4 Tighten the Second Check Retaining Screws I ONLY AFTER the First Check Module A as been installed Binding N...

Page 16: ...ng Ring D Coax First Check Module A into its fully seated position by hand 2 Alternatively using a piece of 1 x4 wood cut to 16 length F as a lever between the Second Check Seat G and the First Check Towers C coax the First Check Module A into its fully seated position 3 Be certain First Check Module A is fully seated and Check O ring E is NOT fish mouthed or damaged 4 Now fully tighten the First ...

Page 17: ...in that Access Port O ring A does not become dislodged during the process 3 Insert Cover Bolts D and Tapered Washers E into Tapered Cover Holes F Tapered Washers E must be properly installed or the Access Port Cover C will not seal under pressure 4 Use 15 16 Socket Wrench G to tighten the 4 center Cover Bolts D alternating from one side of the valve to the other Then Tighten the four corner bolts ...

Page 18: ...lathead Screwdriver Close Bypass Test Cock Number 1 and 2 B Test Cock is closed when screwdriver slot on stem is perpendicular to water flow through Test Cock 3 Use the T handles to open bypass Ball Valve Number 1 C and then open bypass Ball Valve Number 2 D Ball Valve is open when T handle is parallel to water flow through Ball Valve 4 Double check to be certain of the following All Cover Bolts a...

Page 19: ...ise to the open position Shut Off Valve is open when yellow orange position indicator flags are parallel to the mainline water flow 2 Slowly rotate the Number 2 Shut Off Valve Operation Handle B counterclockwise to the open position Note Yellow Orange Position Indicator Flags must be parallel to mainline water flow for Backflow Valve to be functional C BD INST 4X2030 Rev A 09 06 2019 Copyright 201...

Page 20: ...plug will need to be installed to protect the internal components of the gear box Step 1 Using wire cutters cut the wires coming out of the gearbox as close to the gearbox as possible Step 2 Use a piece of thread seal tape to seal the threads on the NPT plug Step 3 Using an Allen wrench install and tighten the NPT plug into the same threaded hole where the wires were previously cut BD INST 4X2030 ...

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