HAnd DiaPHragm PrImer

Diaphragm Primer

THE DIAPHRAGM PRIMER contains a rubber diaphragm working in an aluminum chamber. A levered handle attached to it by a connecting rod actuates the diaphragm. Air is drawn into the chamber through a suction valve on the up-stroke and discharged through a discharge valve on the down-stroke. The primer body is made of a light weight aluminum alloy. The diaphragm is of molded rubber, and it is extremely tough and longwearing. A rubber air discharge valve, built into the diaphragm, provides a positive seal. We manufacture #5 Diaphragm Primers(DP5), #7 Diaphragm Primers(DP7), and #9 Diaphragm Primer(DP9).

PRIMER SELECTION CHART
PRIMER	PIPE SIZE
DP5	2", 3", and 4"
DP7	4", 5", and 6"
DP9	6", 8" or Larger

PRIMER CAPACITY CHART
PRIMER	# of Strokes to Prime Through 25' of 4" Suction			# of Strokes to Prime Through 25' of 6" Suction			# of Strokes to Prime Through 25' of 8" Suction
PRIMER	5" HG	10" HG	15" HG	5" HG	10" HG	15" HG	5" HG	10" HG	15" HG
DP5	10	27	55
DP7	6	15	32	12	33	65
DP9	4	9	20	10	23	45	17	37	77

INSTALLATION & OPERATION

TROUBLESHOOTING

Attach the mounting bracket to the centrifugal pump or skid.
Connect the primer suction inlet to the priming port on the centrifugal pump with a non-collapsible hose or flexible tubing. Be sure all connections are airtight.
If the primer is connected to a pump discharge, a cutoff valve should be installed in the priming line. This valve should be closed immediately after priming to prevent the pump from discharging through the primer.
If the primer is connected to the pump suction, a cutoff valve is recommended.
A cutoff valve may be used on the pump discharge to prevent air from being drawn into the pump from the discharge line while priming.
All primers are equipped with a drain cock installed in the suction chamber for draining excess water after each use. The drain cock must always be closed when the primer is in use.

If you cannot get the primer to prime, try one of the following:

Make sure the drain cock is closed. The drain cock should only be opened after priming to drain any liquids in the primer body.
Make sure there is no debris left inside where the check valve is. Any debris can cause clogging.
Inspect the diaphragm for any tears or cracks.
Check the line for any blockage or loops. The line must be straight and not twisted in any way.
Check any strainers for blockage.
Check all sections of the suction for air leaks.