Prepared by: RJG Rev. #: A
Revised by: JAF Date: 03/23/12
Approved by: WAH 1200644
Revision Date:14AUG13
W.S. DARLEY & CO.
Operating/Troubleshooting Instructions for Darley
Electrically-Clutched Belt-Driven Priming Pump
The Darley electrically-clutched belt-driven primer will develop up to 25 in. Hg. in an air tight
pumping system.
The Primer is activated by a push-button momentary electric switch. Pushing and holding this
switch in opens the 12/24 VDC electric ¼ turn ¾” ball valve and closes the electrical circuit
to energize the clutch, engaging the belt drive system, in turn spinning the primer rotor
within the primer body. Releasing this switch will close the ¼ turn electric valve and
disengage the primer clutch, ending the priming cycle.
The 12/24 VDC electric ¼ turn valve utilized in this system has a 0.8 second cycle time as well
as a logic controller to make necessary adjustments internally depending on input voltage,
therefore maintaining a constant 0.8 seconds open/close cycle time. This valve will act as
a bubble tight check valve, therefore once the momentary push to prime switch is released,
this ¼ turn valve will automatically close and contain the prime of the pump system.
Before the pump can be primed, booster line valves, drain valves, cooling line valve, and all
other openings into the pump must be closed and absolutely air tight. In cases where the
discharge side of the pump is sealed by a check valve, the main discharge valves need not
be closed.
When operating from draft, suction hose connections must be tight and free of air leaks.
Make certain the suction hose strainer is properly submerged and free of foreign material.
The main pump drive must be engaged to initiate priming
FOR ALL PRIMING SCENARIOS:
If water does not discharge from the primer exhaust within 80
seconds stop the primer pump, check for air leaks and
resolve the issue before attempting to re-prime. MAX
PRIMER OPERATION TIME = 80 seconds. DO NOT EXCEED
80 SECONDS OF PRIMER OPERATION. Repeated operation
should be avoided.
The primer pump generates heat as soon as operation
begins. Extended run times (up to 80 seconds) and repeating
priming cycles consecutively or within short time periods
may lead to accelerated wear or premature failure of the
primer pump assembly. If an attempt to prime should fail,
thoroughly inspect the pump system for air leaks and resolve
the issue before attempting re-prime.
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