WATTS Valve LF909RPDA

Servicing First and Second Checks

1. Remove the hatch cover bolts. The 909 is designed so that when the bolts are backed off 1⁄2", all the spring load is re leased from the cover and retained by the check module. Be sure to verify this before removing all the bolts.

2. Lift the check valve module straight out taking care not to hit and damage the seating.

3. The seat ring may be removed and replaced by:

Sizes 4" – 10" (100-250mm) pulling out the two wire retainers.

Sizes 21⁄2" – 3" (65-80mm) twisting one quarter-turn removes the seat.

The wire retainers are 10” long. One is drawn out clockwise and the other is drawn out counterclockwise.

4. The seat ring can be lifted straight up and removed.

5. To replace the disc on sizes 21⁄2" – 4" (65-100mm) simply remove the re tain ing nut or for sizes 6" – 10" (150-250mm) remove the allen head socket screws. Reverse this procedure to install the new disc.

Purpose: To test check valve No. 2 for tightness against reverse flow.

Requirements: Valve must be tight against reverse flow under all pressure differentials. Slowly open the ‘high’ valve A and the ‘vent’ valve C, and keep the ‘low’ valve B closed. Open test cock #4.

Indicated pressure differential will decrease slightly. If pressure differential continues to decrease (until the vent opens) check valve #2 is reported as ‘leaking’.

Purpose: To test shutoff #2 for tightness.

Requirements: After passing Test No. 1, continue to Test No. 2 by closing test cock #2. The indicated pressure differential will decrease slightly. If pressure differential continues to decrease (approaching ‘zero’), shutoff #2 is reported to be ‘leaking’.

Purpose: To test check Valve No. 1 for tightness.