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7.
NOTE: When installation is made into a
line with zero pressure or when
pumping into an open vessel, use the
optional three function injection valve
which provides back pressure and
anti-siphon capabilities.
8.
9.
Injection valve installation
The injection valve is designed to prevent a back flow and to inject chemical into the
line. To work properly, this valve must be mounted within 45 degrees of vertical (see
drawing). One end of the injection valve is 1/2" MNPT. Install this end into the piping
system. Use Teflon tape on this fitting only. Connect the pump's discharge tubing to the
opposite end of the injector. Do not use Teflon tape or joint compound on this fitting.
Connect tubing between this fitting and the pump discharge fitting at the pump head.
Optional Three Function Valve.
The optional 3-function valve injection assembly provides three functions in one
injection valve assembly.
Anti-siphon feature allows metering of liquids "down hill" or into the suction side of
a circulating pump. It provides protection against an accidental application of suction
pressure at the fluid injection point. Its Teflon coated diaphragm provides a positive
anti-siphon action.
Back pressure function permits metering into atmospheric discharge (open container)
without over-pumping.
Line check permits removal of discharge tubing without release of system fluid.
Priming / Degassing Valve Connection
Connect the clear poly tubing to the outlet of the bleed or priming valve. Position the
free end of this tube in the chemical container. Standard head configurations include a
priming valve built into the head. Clear poly tubing should be connected to the outlet of
this valve, the other end of the tube should be placed in the chemical container above
the fluid level.
6
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