27
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backflow.apollovalves.com
ES1597 REV A.
BFMMDC4ANLBF
A.
DISASSEMBLY - CHECK VALVE MODULE
1. Close #2 bypass line shut-off valve, then close #1 bypass line shut-off valve.
2. Bleed pressure from the assembly by opening all test cocks on bypass DC.
3. Unscrew cap using hex head provided.
4. Push down and turn the spring retainer 90° to remove. Remove the spring. Remove the poppet from the check seat.
5. Normally, the check seat need not be removed. If removal is required, rock it back and forth while pulling outward.
B.
DISASSEMBLY - CHECK VALVE POPPET
CAUTION: DO NOT USE PLIERS OR OTHER TOOLS, WHICH MAY DAMAGE OR SCRATCH THE PLASTIC STEM.
1. Holding the poppet assembly in one hand, remove screw and retaining washer.
2. Remove the seat disc.
3. All parts should be carefully inspected for any damage or excessive wear and thoroughly rinsed in clean water prior to reassembly. Replace worn
parts as necessary.
C.
ASSEMBLY - CHECK VALVE POPPET
1. Install new or cleaned disc in poppet and secure with washer and screw.
D.
ASSEMBLY - CHECK VALVE MODULE
1. If the check seat was removed, install the new o-ring and lubricate. Line up the seat with the bore and push it firmly into place.
2. Place and center the poppet assembly in the check seat.
3. Install the spring onto the poppet.
4. Install the spring retainer onto the spring by pushing down into the grooves of the check seat and turning 90°. Ensure spring retainer pops up
about 1/8” and locks into the lugs.
CAUTION: Ensure the spring retainer orientation matches that in the parts list drawing or the device’s flow will be significantly
restricted (i.e. - do not install the spring retainer upside down).
5. Apply a thin coat of Apollo® supplied lubricant, DOW 111 or equal, on cap o-ring.
6. Install cap.
IX. MAINTENANCE INSTRUCTIONS - BYPASS DOUBLE CHECK (TYPE 1)
