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Check Parts and Disassembly

Before reinstallation of check assembly, thoroughly clean o-ring groove and lubricate o-ring with FDA approved lubricant.

Item No.

Part Description

1.

First Check O-ring (removable)

2.

Clapper Assembly (removable)

3.

Clapper Retaining Plate Screws (removable)

4.

Clapper Retainer Plate (removable)

5.

Clapper Disc (removable)

6.

Pivot Arm Pin (removable ) Two c-clips

7.

Second Check O-ring (removable)

Note: Align holes and
insert pin or small
screwdriver to hold in
open position.

Figure 7

Figure 8

Figure 9

Figure 10

Check Disassembly

Please use caution when disassembling check.

Check Parts

6

Figure 7

Using a thin rod or screwdriver, lift the bar
up so that the clapper is free to swing up-
wards away from the seat.

Figure 8

Using your free hand, swing the clapper
open until the roller is almost to the free
end of the bar. Align the maintenance
lockout holes in the bar and the hinge
arms. Secure the check assembly in the
maintenance position by inserting a rod or
thin screwdriver through the lockout holes.

Figure 9

Remove one c-clip from the center pivot
pin. Withdraw the center pivot pin from the
clapper and the hinge arms. Remove the
clapper assembly from the check assembly
module. Remove the retainer screws. Note:
You may replace this item as an assembly or
you may continue and replace only the disc.

Figure 10

Disassemble the clapper by removing four
screws, disc retainer and the sealing disc.
Disc may be flipped if sealing surface
is damaged.

Summary of Contents for 775 Series

Page 1: ...misapplication or improper installation of the product THE COMPANY MAKES NO OTHER WARRANTIES EXPRESS OR IMPLIED EXCEPT AS PROVIDED IN THIS LIMITED WARRANTY For field testing procedure send for IS TK...

Page 2: ...o remove foreign material before installing the unit A strainer should be in stalled as shown ahead of the backflow preventer to prevent discs from unnecessary fouling CAUTION Do not install a straine...

Page 3: ...Up D The downstream shutoff should be closed Open upstream slowly fill the valve and bleed the air through Test cock 2 3 and 4 When valve is filled open the downstream shutoff slowly and fill the wat...

Page 4: ...Check 6 and 8 models only Place yourself so that the water flow through the valve is left to right 1 Shut down water system and lock out system if possible Slowly open all ball valves to relieve air a...

Page 5: ...775DCDA RC1 3 4 3 4 775 775DCDA N775 N775DCDA 0888907 RK 775 775DCDA RC1 6 8 6 8 775 775DCDA N775 N775DCDA Kit includes First Check Assembly O ring and Check Disc Second Check Rubber Parts Kit 088890...

Page 6: ...screwdriver lift the bar up so that the clapper is free to swing up wards away from the seat Figure 8 Using your free hand swing the clapper open until the roller is almost to the free end of the bar...

Page 7: ...urns to PSID No 2 shutoff valve is leaking excessively and must be replaced to test the valve 8 Close all test cocks remove hoses from TC 2 and TC 3 and TC 1 reopen shutoff valve 1 Proceed to Test No...

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