Water Flow Test
Water-Flow test a Humat 4-way valve in Hydrant Mode
Performed in Bel Air, Maryland at Jackson Blvd & Briarcliff with engine 314

A Humat model 100 4-Way Hydrant Valve, with a 4 1/2" NHT Steamer
connection and a 5" Storz attached to the small chamber, was used.  One 20'
section of 5" Snap-Tite hose with 5" Storz couplings was attached to the small
chamber and to a pump inlet.  A pressure gauge was fitted to a 2 1/2" blind
cap on the hydrant to determine residual hydrant pressure and an Engine Panel
Inlet Gauge was calibrated to read inlet pressure.  They Hydrant was on 20"
main with static pressure of 115 psi.

Un-boosted readings in hydrant mode were the only readings taken because
the friction loss and turbulence went to a negligible level when switched to
pump mode, even with 2000 GPM flows.  Water flows in a straight line through
a Humat valve in pump mode.
  1000 GPM Flow No
VALVE on Hydrant
(hose attached
directly to                  
     hydrant)
1300 GPM

NO
VALVE
*1000 GPM
through Humat

(hydrant mode)
*1300 GPM
through Humat

(hydrant mode)

PSI Residual

103

98

106

99

PSI Pump Inlet

100

92

80

57

Pressure Drop

3

6

26

42

Less Friction
Loss in Hose

------                 

-----

3

6

Actual Friction
Loss through
Humat Valve


-----


----


23


36
* Please note that friction loss is given in the hydrant mode only
because, in the pump mode, friction drops to negligible amount, even
at 2000 GPM.