4
Customer Service
(704) 841-6000
www
.apolloflowcontrols.com
“Apollo”
Flow Controls
INSTALLATION, OPERATION & MAINTENANCE
MANUAL
FIGURE 3
FIGURE 2
III. TROUBLESHOOTING
IV.
MAINTENANCE INSTRUCTIONS
SYMPTOM
CAUSE
CORRECTIVE ACTION
Check valve fails to hold 1 psid.
1. Shut-off valve not closed completely.
2. Check valve fouled with debris.
3. Check poppet stem not moving freely in
guide.
1. Close #2 shut-off valve or inspect for
possible through leakage.
2. Inspect and clean seat disc and seat.
3. Inspect for debris or deposit on poppet
stem or guide.
2-1/2” - 6” SIZES
Open test cocks #2, #3, and #4 to relieve pressure from the device. Both shut-off valves must be closed.
A.
CHECK REMOVAL
Note: If the first check seat disc needs only to be cleaned, it is not necessary to remove the entire check module from the valve body.
See the next section, “Check Maintenance”, for seat disc cleaning instructions.
1. Remove the cover clamp by backing off the nut until the latch can be disengaged from the T-bolt. Pull the clamp apart and slide away from the
valve. See Figure 2.
2. Lift off the cover. A flat screwdriver will aid in lifting the cover out of the body. See Figure 2.
3. Remove the check-retaining spacer from the body. Pull the check module straight out of body. The check module is sealed in place with an o-ring.
See Figure 3.
