Apollo Valves DC4A Handbuch für Installation, Betrieb und Wartung - Seite 5
Blättern Sie online oder laden Sie pdf Handbuch für Installation, Betrieb und Wartung für Kontrolleinheit Apollo Valves DC4A herunter. Apollo Valves DC4A 12 Seiten. 1/2 inch - 2 inch double check valve (dc) backflow preventer
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III. TROUBLE SHOOTING
SYMPTOM
1 . Check valve fails to hold
1 psid .
IV. MAINTENANCE INSTRUCTIONS 1/2" – 2"
A. Disassembly - Check Valves
1 .
Close #2 shut-off valve, then close #1 shut-off valve .
2 .
Bleed pressure from the assembly by opening #2, #3, and #4 test cocks .
3 .
Unscrew cap using hex head provided .
4 .
Push down and turn the spring retainer 90 degrees 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 disc in poppet and secure with washer and screw .
D. Assembly - Check Valve
1 .
If the check seat was removed, install the new o-ring and lubricate with a thin coat of Apollo supplied lubricant, DOW 111
or equal . 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 degrees .
Ensure spring retainer pops up about .1" 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.
5 .
Apply a thin coat of Apollo supplied lubricant, DOW 111 or equal on cap o-ring .
6 .
Install cap .
Customer Service (704) 841-6000
CAUSE
a . Shut-off valve not closed
completely .
b . Check valve fouled with
debris .
c . Check poppet stem not
moving freely in guide .
www.apollovalves.com
CORRECTIVE ACTION
a . Close #2 shut-off valve or
inspect for possible
through leakage .
b . Inspect and clean seat
disc and seat .
c . Inspect for debris or
deposit on poppet stem
or guide .
BFMM DC4A SBF
5