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New Installations

When ordering with a new meter, the Spring Loaded Check Valve is mounted to the inlet side of the meter, between the Strainer/Air Eliminator and meter housing (as shown in the figure).

 

 

Retrofit Installations

Depending on the existing configuration, adding a Spring Loaded Check Valve may require modification of the inlet piping. Close any valves on the inlet and outlet side of the meter and relieve all pressure from the system.

 

After relieving the internal pressure from the system, drain the meter and connecting piping all fluid. This is done by opening the drain plugs on the meter. Then, disconnect the inlet line from the inlet side of the strainer/air eliminator assembly. Once this is complete, remove the strainer/ air eliminator assembly from the meter. Keep all screws and washers, since they will be necessary during reassembly of the system.

 

A spring loaded check valve is either square or round. Square check valves come with a gasket. while round check valves do not use a gasket and are only installed on systems which have high capacity strainers. The gasket is found on the output side of the check valve, such that it rests between the check valve and the meter housing. The strainer/air eliminator connection is equipped with an O-Ring seal and will rest between the strainer/air eliminator housing and the inlet side of the check valve.

 

Position the check valve as shown in the figure below, and reinstall the strainer/air eliminator using the bolts and washers that were previously removed.

 

 

Check Valve Assembly

Follow these steps to assemble the check valve:

 

1.Insert the poppet through the center of the valve plate.

2.Fit the spring over the poppet end.

3.Use the washer to hold the spring in place, then push the washer down to compress the spring until the hole for the cotter pin is accessible.

4.To secure the assembly, insert the cotter pin and bend the ends around the end of the poppet assembly.

 

The gasket has a center hole that is slightly larger than the outer diameter of the poppet assembly, so it can be installed when the check valve is installed between the strainer/air eliminator assembly and the meter housing.