For Non-Manifold Use:
If purchased with diaphragm valves, the male ½ NPT ends of the diaphragm valve elbows are
installed into the inlet ports of the switchover system. Install the male ¼ NPT end of each pigtail into
the ¼ NPT ports of the diaphragm valves. The connection available at the other end of the pigtail
will depend on how the system was purchased. If the pigtail does not have a cylinder connection
installed, there will be a female ¼ NPT thread on the end of each pigtail. The female ¼ NPT pigtail
end will connect to the user’s system. If configured with a CGA connection or foreign inlet
connection, the connection will be specific to the particular cylinder of gas to be used. Some
connections do require the use of a gasket. Please note that the material of the gasket must also be
compatible with the type of gas being used. Be familiar with the type of connection being used, and
its proper procedures for installation.
Figure 8 - Pigtail
Connecting to a Cylinder:
Figure 9 - Diaphragm Valve with
1/2” NPT Street Elbow
1. Before removing the cylinder cap, move the cylinder of gas to the work site:
a. Secure cylinder to the floor, wall, or bench with appropriate chain, strap, or stand to
prevent toppling.
b. Remove the cylinder cap.
c. Be sure the cylinder valve is tightly closed (clockwise).
d. Remove the cylinder valve plug, if any.
e. Inspect the cylinder valve and threads for damage or contamination.
2. Secure the cylinder connection to the cylinder in the following manner:
a. Do not force. Tightening the nut onto the cylinder connection should be easy. If it is not,
the connection may be wrong for the type of gas being used.
b. Left-hand threads are used on some cylinder connections. A notch in the middle of the hex
nut typically indicates a left-hand thread.
c. Gaskets are used on some inlet connections. Be sure the gasket is in good shape. Do not
over-tighten to avoid squashing the gasket into the gas line. Keep extra gaskets on hand.
d. Never use oil or grease on regulator or cylinder fittings, as it may contaminate pure
gases or create a fire hazard.
Installing the Outlet Connection:
The AutoS
witch system has the outlet connection at the top of the box. The connection is a 1/4”
tube connection. Connect tubing to the AutoSwitch that is compatible with the application and is
capable of handling the pressure required.
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