9
WARNING
: If there is any leakage around the coupling nut and it appears to have been
installed correctly, DO NOT TIGHTEN the coupling further! Release pressure in the line,
disconnect tubing, re-cut and re-connect. Tightening of misinstalled tubing may cause the
tubing to pop off under pressure.
2.4
Discharge Tubing
Cut a length of tubing long enough to go from the pump to the application (injection) point.
Additional tubing can be ordered from your distributor. Avoid sharp turns or bends and hot
surfaces. Routing tubing through rigid pipe such as PVC pipe is recommended for long runs
and/or as protective shielding against corrosive chemicals. If applicable, install the injection
valve in 1/2” NPT thread at the injection point (see section 2.5) and connect the discharge tubing
to the injection valve.
Attach tubing as described in section 2.3 and as shown in Figures 5 and 6. Note: Some models
have an air vent valve with two outlet connections. The connection marked ‘OUT’ is the
discharge side to the application point. (Fig 6).
Attach a second length of tubing to the air vent side marked (‘AIR’) and route back to the
chemical solution tank or drum. On the larger pumps (31 & 36 sizes), the air vent valve
connections are not marked, however, the discharge side is the vertical (UP) connection and the
air vent connection is on the side of the valve.
Valve
Housing
Shoulder
Coupling Nut
Tubing
Figure 6
Air Vent Valve Tubing
Figure 5
Attaching the Tubing
"AIR"
"OUT"
Drains back to tank
Discharges to injection point
