Liquid Controls Air Actuated & Differential Check Valves K-7, K-15, & K-30 - Manual (Page 4)

4
K-7 Valves
New Installations
When ordered with a new metering system, the Check
Valve is supplied mounted to the metering system as
shown to the right. A line must be connected to the flange
on the outlet side of the 2-stage, preset valve. This flange
connection is 2” NPT.
Finally, install a vent line from one port of the check valve
to the air eliminator. Plug the other side of the check
valve.
Retrofit Installations
Depending on the existing configuration, adding a Check
Valve may require modification of the outlet piping.
After the internal pressure is relieved from the system,
the output line can be disconnected from the output side
of the meter. If the system includes an electronic, 2-
stage, preset valve, remove it from the meter. The check
valve assembly can then be connected to the output side
of the meter.
Use the four bolts and washers to fasten the valve
assembly to the meter. The valve has an arrow showing
the direction of flow. Ensure that the valve is properly
oriented.
Tighten the bolts in a crossing pattern. Once the check
valve is secure, the electronic, 2-stage, preset valve can
be connected to the back check valve as shown to the
right. Once this is complete, the output piping may be
reconnected to the electronic, 2-stage, preset valve. The
preset valve output fitting is 2” NPT.
Run a line from one port of the check valve to the air
eliminator. Plug the other side of the check valve.
! ! ! ! !WARNING!
Before disassembly of any meter or accessory component, ALL INTERNAL PRESSURES MUST
BE RELIEVED. Pressure must be 0 (zero) psi. Close all liquid and vapor lines between the
meter and liquid or gas pressure source (such as the supply tank, discharge lines and supply
lines).