Inspect The Vacuum Relief Valve; Clean The Vacuum Relief Valve - Conair PD Series User Manual

I n s p e c t t h e va c u u m r e l i e f va l v e
The vacuum relief valve is designed to protect the pump from damage if the conveying line
becomes clogged or obstructed. To check the valve:
1
Remove the inlet hose on the inlet filter housing.
2
Partially obstruct the inlet by using a rigid flat plate and slide it across the opening until 12
inches Hg registers on the gauge. Do NOT completely block the inlet. The relief valve should
open at approximately 12 inches Hg. Do not exceed 15 inches Hg. If the valve does not
release at or below 15 inches Hg, replace the valve.
✐
Note: Gauges should be checked/calibrated every 12 months (if applicable).
3
Reconnect the hose to the inlet of the pump.
C l e a n t h e va c u u m r e l i e f va l v e
1
Stop the vacuum pump, disconnect and lockout the main power to the pump.
WARNING: High voltage. Always stop the Positive Displacement Pump,
disconnect and lock out the main power source before troubleshooting
or performing repairs.
2
Thoroughly inspect the vacuum relief valve. Check inside and out for any signs of contami-
nation, residue or other foreign substances that may potentially block the motion of the internal,
spring loaded diaphragm.
3
Clean the inner components of the valve. Use a cleaning agent that will dissolve any plasti-
cizer or oily build-up on the surfaces of the vacuum relief valve. Be sure to clean between the
vacuum relief diaphragm and its seat. Spray the cleaning agent into the valve opening and then
flush out. The valve may require disassembly to reach critical areas.
CAUTION: Wear eye protection. If you use compressed air to clean the equipment, you
must wear eye protection and observe all OSHA and other safety regulations pertaining
to the use of compressed air.
If a valve can not be cleaned adequately it should be replaced to prevent malfunction or a
IMPORTANT:
potentially hazardous condition due to inadequate vacuum relief.
4
Reassemble the valve and re-adjust to the proper vacuum setting (see instructions for
adjusting the vacuum relief valve on the next page. )
M a i n t e n a n c e l 6