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1. Description and Operation
1.1 General Description
1.1.1 The Model 668-400-2 Pressurematic Water System is a complete electrically
powered, constant displacement pump unit. It is used to supply a steady water
pressure of approximately 20 psig (1.38 bar) and a maximum flow rate of 1.5
gpm (5.6 l/m) for the water outlets in aircraft equipped with gravity tanks. In
aircraft with pressurized water tanks, the Model 668-400-2 provides boost
pressure to approximately 20 psig (1.38 bar) above cabin pressure.
1.1.2 Integral parts of the pump unit include a pump pressure regulator, system check
valve and flow sensor, over-pressure release valve, and pressure switch, and
four pole relay. A separate circuit breaker, push-button start switch with
indicator light is also supplied.
1.1.3 The pump unit will withstand pressure surges to 120 psig (8.28 bar) without
damage, leaks or malfunction. It employs magnetic coupling between the drive
motor and pump assembly and is therefore leak-proof and contamination free.
1.2 Specifications
1.2.1 Specifications for the Model 668-400-2 Pressurematic Water System are as
follows:
1.2.1.1 Pump Type: Gear, positive displacement
1.2.1.2 Motor Type: Induction, continuous duty, 10,000 rpm
1.2.1.3 Electrical: 200 VAC, 400 Hz, 3 phase (115 VAC phase-to-neutral), 1 amp
1.2.1.4 Ports: AND 10050-6
1.2.1.5 Pressure Regulator Adjustment: 23 psig (1.59 bar)
1.2.1.6 Flow: 0-1.5 gpm (0-5.6 l/m)
1.2.1.7 Weight (Shipping): 4 lb (1.81 kg)
1.2.1.8 Dimensions: as given in Figure A.
1.3 Operation
PO Box 8975, Vancouver, WA 98668-8975 • Phone: 360/253-2008 • Fax: 360/253-8294
2 Howard Road, Eaton Socon, St.
maximum.
MICROPUMP, INC.
A Unit of IDEX Corporation
MICROPUMP
A Subsidiary of Micropump, Inc.
Neots, Cambridgeshire, PE 19 8ET England, • Phone: 011-44-1480-356600 • Fax: 011-44-
LIMITED
356300
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