Rotary expansible chamber devices – With signal – indicator or transparent inspection means
Patent
1995-12-20
1998-03-17
Freay, Charles G.
Rotary expansible chamber devices
With signal, indicator or transparent inspection means
418 40, 4182061, 417 43, 417 63, 417212, 7386177, F01C 2100
Patent
active
057279330
ABSTRACT:
A pump for use in additive systems such as foam chemical additive systems for fire fighting water, the pump including impeller elements and flow meter elements in a common casing. The pump casing provides a gear pump arrangement using two enmeshed gears on an inlet side, and a closely adjacent gear flow meter arrangement downstream of the gear pump arrangement within the same pump casing. The gear flow meter elements are driven only by the force of liquid pumped by the enmeshed gears of the gear pump and cause very low pressure drop across the flow meter elements. Therefore, inaccurate measurements of flow rates due to slippage and viscosity variation are reduced compared to measuring the rotary speed of gear pump gears directly. The system is optimally used to meter and add foam chemical into a pressurized water line for fighting fires.
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Laskaris Michael A.
Quinty Glenn D.
Freay Charles G.
Hale Fire Pump Company
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