SKC 222-Series Low Flow Pump - Manual (Page 8)

6
Maintenance
Checking for Leaks
To function properly and provide correct pumping volume, the diaphragm
must be free from leaks and close positively. Remove cover plate and check the
following:
Intake Valves
1. To check the intake valves for leaks, connect a water manometer and a tee
connection to the pump inlet as shown in Figure 1 below.
2. On the open end of the tee, draw vacuum by mouth until 4 to 5 inches of
water vacuum register on the manometer.
3. Seal off the open end of the tee and watch the manometer. The water level
should drop less than one-half inch in ten seconds.
Diaphragm and Valve System Integrity
1. With the water manometer and tee connected to the inlet (see Figure 1 above),
seal off the outlet of the pump and introduce positive pressure through the
open end of the tee until 4 to 5 inches of water register on the manometer.
2. While maintaining the pressure, seal off the open end of the tee and watch
the manometer. The water level should drop less than one-half inch in ten
seconds.
Exhaust Valve Seating
1. Disconnect the tee and water manometer from the pump inlet and connect
them to the outlet of the pump.
2. Introduce positive pressure through the open end of the tee until 4 to 5 inches
of water register on the manometer.
3. While holding this pressure, seal off the open end of the tee. Watch the
manometer. The water level should drop less than one-half inch in ten
seconds.
Back of Pump
Inlet
Water manometer
Outlet
(exhaust)
Open end
of tee
Figure 1.