20-Aug-12
9
PDS Flow Valve – Information Sheet
Your machine has been equipped with the PDS flow control system. The PDS flow control system is the results of
many years of engineering effort to create a flow valve that would be accurate over a wide range of water pressures
as well maintain its volume setting for many years within the harsh water environment that coffee brewing
equipment must operate.
Depending on the model brewer, your equipment may either have the low or high flow valve, or possibly both, built
into the plumbing system of your equipment. The low flow valve is fully adjustable within the flow rate range of 0.04
GPM to 0.31 GPM while the high flow valve covers a range of 0.42 GPM to 1.38 GPM. For easy identification of the
valve in your application, the low flow valve is beige and will have a green bonnet and the high flow valve will have
a red bonnet.
Other features designed in to the valve include an internal water strainer, a non-regulated water supply side for
connecting to a independent faucet system, double “o” ring swivel fittings to eliminate leaks due to equipment being
moved [and to aid in providing quick service], and most importantly a porcelain sleeve with a piston assembly that
is self cleaning which cannot be affected by chemical within the water supply. The system has been designed to
operate over a wide range of pressures; low flow valve from 10 psi to 70 psi and high flow valve from 40 psi to 110
psi with an accuracy of 1% +/-.
The time setting of the timer, in the machine, in conjunction with the flow rate set on the PDS valve will determine
the volume of water delivered for the brew cycle. If the valve is set at a rate of 0.25 GPM and the timer is set for 2
minutes, the volume delivered will be 0.25 x 2 or 0.50 gallons (64 oz.). Refer to the table for other flow rates, timer
settings and volumes. Flow rate accuracy is critical, as the timer setting will not change.
Attention: Pressure Faucet Precaution
When this PDS valve is installed on equipment with pressurized hot water coil faucets, check to see if a back flow
preventer is incorporated in the water line. If not, it may be necessary to install a pressure relief valve. If you have
any questions please call NEWCO technical support at 1.800.556.3926.
Timer Setting Required To Obtain Desired Water Volume
Time Is Shown In Seconds
Desired Flow Rate – In Gallons Per Minute
Volume 0.175 0.200 0.220 0.250 0.300 0.350 0.500 0.750 1.000
1 liter 91 79 72 63 53 45 32 21 16
64 oz. 171 150 136 120 100 86 60 40 30
72 oz. 193 169 153 135 113 96 68 45 34
2.2 liters 199 174 159 139 116 100 70 46 35
2.5 liters 226 198 180 159 132 113 79 53 40
3 gallons 1029 900 818 720 600 514 360 240 180
Brew Time Shown in Seconds
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