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4.1.4.3
Step 3: Expand Clamp
Tighten the expandable internal clamp until the stainless steel portion of the clamp has imbedded
itself into the rubber of the valve. Tighten the lock nut once the internal expandable clamp is in the
proper position and proceed to section 4.1.8 for anchor bolting/pinning to anchor the slip-in check
valve to the mating pipe. When installing multiple internal expandable clamps ensure the clamps are
evenly spaced/ rotated to provide even clamping pressure as well as the internal expandable fasteners
located in a position that minimizes flow interference.
Note: This style of check valve installation
relies on external pressure of the internal expandable clamp to ensure that the valve does not move,
care should be taken to ensure proper sealing.
Figure 20: Model RF-DBI-IN Installation Step 3
4.1.5
Model RF-DBJ: Rubber-Flex Jacket Style Duckbill Check Valve Installation
4.1.5.1
Step 1: Align/Insert
Figure 21: Model RF-DBJ Installation Step 1
4.1.5.2
Step 2: Flange Bolting
Secure the Model RF-DBJ assembly to the mating flanges with the appropriate flange bolting hardware.
Follow the procedures in section 4.1.7 for proper flange bolt torqueing.
Figure 22: Model RF-DBJ Installation Step 2
Align/Insert the Model RF-DBJ Assembly into the required breach opening noting the position of
flow and orientation of the valve. The assembly should be installed to where the top notation on the
Model RF-DBJ shroud is in the vertical position as shown in Figure 21. Use a gasket where required,
supplied by others.
Note: Ensure the bill of the check valve is in the vertical position when installed.