30
Spectra High Pressure Tube Fitting Assembly Instructions
The Aquifer has eight high pressure fittings, two on each cylinder on the Clark Pump, two on the
pressure vessel end caps, and two 90
-
degree elbows on the back of the Clark Pump. As the com-
pression fitting is tightened, it compresses a ferrule onto the stainless tubing, fixing the ferrule
permanently to the tube and holding the compression nut captive.
The body of the fitting seals to the underlying component with an O
-
ring. On the Clark Pump cyl-
inders and the end caps this O
-
ring is compressed by tightening the entire fitting. The O
-
rings on
the 90
-
degree fittings on the back of the Clark Pump have captive nuts and washers, which com-
press the O
-
rings without turning the entire fitting.
If a tube fitting leaks it can sometimes be resealed by just tightening. You must use two wrench-
es, a 13/16
-
inch wrench to hold the base, and a 7/8
-
inch wrench to turn the compression nut.
The 13/16
-
inch wrench will need to be thin so as not to interfere with the compression nut. If
this doesn
’
t work, disassemble the fitting, grease liberally with silicone grease (the ferrule and
the threads) and re
-
tighten firmly.
The base O
-
rings should be
gently
compressed to achieve a good seal, and may be damaged by
overtightening, the washer or the base of the fitting should just touch the block.
Stainless Fitting Hex Nut
Connector O
-
RING
Nickel
-
Bronze High Pressure Elbow
Nickel
-
Bronze High Pressure Straight Fitting
Ferrule
