Hale Q Series Muscle - Manual (Page 25)

25 MUSCLE (Midship) Pumps Installation, Operation, and Maintenance Manual
p/n: 029-0020-63-0
Introduction 
Transfer Valve
A transfer valve, controlled from the apparatus pump control panel, allows the opera-
tor to select VOLUME or PRESSURE operations.
The valve transfers between pumping modes with two and one-half turns of its control
hand wheel. The position of the valve is indicated on the apparatus pump control
panel via a positive mechanical indicator. As an option, Hale also offers a power trans-
fer valve.
Choosing Volume or Pressure Operation
In deciding which range to use (pressure or volume), choose the one that provides the
desired flow and pressure at the LOWEST engine speed.
IMPORTANT!
REFER TO YOUR FIRE DEPARTMENT POLICY FOR WHEN TO USE “VOLUME” OR
“PRESSURE” OPERATIONS. IF YOUR FIRE DEPARTMENT DOES NOT HAVE A POLICY,
REFER TO THE FOLLOWING HEADING, “GENERAL GUIDELINES.”
General Guidelines
1. Hale pumps are designed to pump up to 200 PSI (1379 kPa) net pressure in vol-
ume operation and at reasonable engine speeds.
2. The pump should be operated so that engine speed is within its best operating
range.
3. Generally, volume operation should be used at any net pump pressure under 150
PSI (1034 kPa), especially when pumping from a hydrant.
4. When pumping from draft or a water tank, pressure operation may be used when
the volume is less that one-half the pump capacity and when the desired pres-
sure is over 150 PSI (1034 kPa).
5. Set to VOLUME operation if the pump has to discharge more than 50 percent of
its rated capacity. Be certain to warn everyone involved before switching
between volume and pressure operation.
6. Reduce the pump pressure to between 50 to 60 PSI (345 to 414 kPa) before
switching. The engine speed should especially be reduced when switching from
volume to pressure operation with hand held hoses in use.