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Controls and operating mechanisms
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Truck,Firefighting,Structural, 1,000 GPM, 4 by 2
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Relief Valve



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MIL-T-28571G(NAVY)
a.
Deliver a minimum of 1,000 gpm at 150 psig net pump pressure at less
than the manufacturer's recommended governed speed of the engine.
Deliver a minimum of 700 gpm at 200 psig net pump pressure at less
b.
than the manufacturer's recommended maximum governed speed of the
engine.
c.
Deliver a minimum of 500 gpm at 250 psig net pump pressure at less
than the manufacturer's recommended maximum governed speed of the
engine.
d.
The pump, when dry, shall take suction and discharge water within 30
seconds, with a lift of 10 feet through 20 feet of 5-inch suction
hose.
The piping and valve arrangement shall be capable of delivering water to the
pump at a minimum 500 gpm flow rate, while pumping at 150 psi net pressure.
3.10.1 Priming pump .  The priming pump shall be of the rotary type, 12 VDC
motor driven, complete with lubricating oil reservoir and necessary valves,
operated from the pump control panel.  The priming pump shall develop a vacuum
of 22 inches of mercury (Hg) at an altitude of 1,000 feet above sea level in not
more than 30 seconds.
3.10.2 Suction connections .  The fire truck shall be provided with four
suction connections.  Each suction connection shall be equipped with a removable
and accessible strainer.  One 5-inch suction connection shall be located at the
operator's control panel and one 5-inch connection directly opposite the
operator's control panel on the curbside of the truck and one 5-inch connection
on the right rear of the truck.  One 2-1/2-inch suction connection shall be
located on the fire pump operator's control panel.  A quarter-turn butterfly
type suction valve-shall be installed in the five (5) inch rear suction and
controlled by a chrome plated hand wheel at the pump panel.  The 5-inch suction
connection on the left and right side and the suction valve on the rear of the
truck shall provide a seat for suction hose connection hose gaskets and shall be
threaded with American National standard hose coupling screw thread (NH). The
2-1/2-inch suction connection shall be gated and shall be a female swivel type
with gasket, and equipped with a chromium plated rocker lug plug. The
2-1/2-inch suction connection shall be provided with a 3/4-inch drain valve and
push-pull type controls.  Valves shall be capable of being locked in any
position and handles shall be provided.  The valves shall be capable of holding
500 psi in either direction.  The valve balls shall be trunnion mounted,
corrosion-resistant,  nonsticking type.  The valve seats shall not require
adjustment and shall be capable of holding a vacuum or pressure in either
direction.
The valve ball and seats shall be replaceable without disturbing the
valve piping.  The 2-1/2-inch suction valve shall be properly identified as to
function and indicate when open or Closed.  An adjustable 2-1\2-inch or larger
intake pressure relief system shall be permanently installed (per NFPA-1901).
Shutoff valves or other means to disable the relief system shall not be
permitted.
3.10.3  Dis charge connections .  The fire truck shall be provided with eleven
bronze gated locking type discharge connections.
Each discharge connection
shall provide a seat for discharge gaskets and shall be threaded with NH
threads .  Each 2-1/2-inch discharge connection shall be provided with a rocker
lug and chromium plated cap with gasket, chained to the valve body.  Each
discharge connection shall be provided with hose discharge digital flow meters
18

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