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Copyright © 2022 White Knight Fluid Handling | A Graco company
9/14/2022 Version 1.1.4
187 E. 670 S., Kamas, UT 84036
435.783.6040 888.796.2476
3.2 PSD Installation Advantages
3.3 System and Pump Environment
Passing Solids
All damage caused by passing solids (wafer shards, etc.) is coverable under warranty when your pump
is used in conjunction with a White Knight Catcher™ pre-pump filter.
Running Dry
White Knight PSD pumps are capable of running dry without damage other than normal wear to the
pump. When a pump is run dry it cycles faster than normal, accelerating the rate of normal wear.
Head Pressure / Dead-Head
White Knight PSD pumps may be controlled by opening and closing the outlet of the pump and may be
installed in any head pressure situation up to dead-head. Dead-head occurs when air supply pressure
and the liquid line (head) pressure are equal. Dead-head conditions allow for no flow. Under dead-head
conditions the PSD will cease to cycle (limiting wear) until conditions change allowing for flow.
Temperature
The PSD may be operated safely in low temperature applications. Take care to avoid freezing or
crystallization of the fluid inside or outside of the pump. Running the pump at temperatures below
freezing may accelerate the wear of the elastomer components within the pump. In applications where
the media or pump temperature varies, torque values (tension) of the manifold and head bolts must be
monitored. TE versions of the PSD Series pumps can be operated at temperatures up to 100°C
(212° F). UH versions of the PSD Series pumps can be operated at temperatures up to 70°C (158°F).
Clean Dry Supply Air (CDA)
Operation of the point of 5 PSD08 requires class 4 quality air for particles, moisture, and oils.
(maximum particle size 15 microns, 3° C Dew 5 mg/m
ᵌ) per ISO8573 – 1.
Flammable Solvents
Any system used to pump flammable solvents should be properly grounded. A test from River’s Edge
on using isolative pumps to pump flammable liquids indicated that the liquid itself must be grounded and
that other procedures should be followed. A copy of the test is available upon request from White
Knight.
Pumping Liquids Near Boiling Point
The boiling point of a liquid is reduced under vacuum (suction) conditions. Due to the vacuum caused
by a pump, liquid could boil in the inlet line of the pump when it is not boiling in the tank (or other supply
reservoir). Placing the pump as close as possible to the tank and with as little vertical lift as possible
(the pump being flooded by gravity is ideal) minimizes boiling in the inlet line. Boiling of the liquid in the
inlet line causes a pump to “race” and accelerates the wear of the pump. Boiling liquids may cause
cavitation to occur. Damage to wearable or non-wearable components of the pump caused by cavitation
is not covered under warranty.
Abrasive Slurries
For slurry applications White Knight recommends use of the PSD UH pump.
Running a Submerged Pump
When running the PSD in submerged mode, the exhaust air must be sealed and redirected above the
surface of the media. Take care that all pump parts (air side and wet side) are resistant to the media
being used. It may be necessary to mount the pump to the bottom of the tank. Operating this pump
while submerged requires use of a remote muffler adaptor kit.
Summary of Contents for PSD04
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