Backflow Direct Deringer 20 Specifiche tecniche

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

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.backflowdirect.com/warranty

READ INSTRUCTIONS IN FULL BEFORE INSTALLATION.

QUESTIONS? CALL 916-760-4524 M-F 8:00 AM –4:30 PM PST

REV: A | 09/06/2019 | BD-INST-4X2030

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

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 ofAllen 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” Socket

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

Closing Shut-Off Valves Prior to Maintenance

1. Slowly rotate Shut-Off Valve #2 Handle (B) clockwise

to the closed position. Flag perpendicular to flow (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 in the closed position (A).

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Note

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

Opening Test Cocks and Bleeding All Pressure from the Line Before Maintenance

1. DO NOT OPEN Main Test Cock Number 1,

as it is still subject to line pressure.

2. Using the Backflow Direct test cock wrench or

a small adjustable wrench open (A) Main Test

Cock Number 4. (Test Cock 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 Backflow Direct test cock wrench

or a small adjustable wrench open Main

Test Cock Number 2.

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

Removing Access Port Cover Plate

1. Using a 15/16”socket wrench loosen 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).

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

Removing the First Dual-Action Check Module

1. Use a 15/16”Socket Wrench to loosen the check retainer bolts on

both sides of the valve body (A). Do not completely remove 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).

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 by hand.

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

Removing the Second Dual-Action Check Module

1. Use a 1 1/8”Socket Wrench to loosen the Check Retainer Bolts on

each side of the valve body (A). Do not completely remove 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.

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

Disassembly and Maintenance of By-Pass Check Valve

1. Use an adjustable wrench to

rotate Check Cover (A)

counterclockwise 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.

Page 8 of 20

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

LLC

Disassembly and Maintenance of By-Pass Check Valve (continued)

1. To replace a damaged Red Silicone Poppet Disk, use a #2 Philips Head

Screwdriver 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.

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

Removing Bypass Meter

1. Using the Ball Valve Handles close the #2 Bypass Ball Valve (A) and

then #1 Bypass Ball Valve (B). (Ball Valve is closed when “T” handle is

perpendicular to water flow through Ball Valve).

2. Using a #2 Flat Head Screwdriver open Bypass Test Cock #2 (C) and

then open Bypass Test 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 reinstall Bypass Meter.

Remember install Gaskets (F) before threading Meter Coupling Nuts

into place.

F G

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