Liquid Controls Air Actuated & Differential Check Valves K-7, K-15, & K-30 - Manual (Page 8)

8
K-30 Valves
The K-30 check valve is used on M-30 3” meters. The K-
30 check valve is a combination of the K-15 check valve
Model A3845 and a pipe nipple assembly. The nipple
assembly includes two flanges. One flange is 6” square
with a 3” NPT thread, the other is 4.75” square with a 3”
NPT thread. The pipe nipple is 3” in diameter and 4” in
length.
The pipe nipple assembly is included in order to mount
the check valve to the meter as the meter connection is
larger than the check valve connection.
New Installations
When ordered with a new metering system, the K-30
Check Valve is supplied mounted to the metering system.
A line must be connected to the flange on the outlet side
of the check valve. This flange connection is 3” 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. In the example to the right, the output line
would be connected to the M-30 PD Meter. The check
valve assembly can then be connected to the output side
of the meter using the nipple assembly.
Use the four bolts and washers to fasten the nipple
assembly to the M-30 PD Meter. Tighten the bolts in a
crossing pattern.
Use the four bolts and washers to fasten the check valve
to the other end of the nipple assembly. The check 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 output line may be reconnected to
the output side of the check valve. The output fitting is 3”
NPT.
A vent line must be connected from one side of the check
valve to one side of the air eliminator. Plug the other side
of the check valve.