MA-4 Positive Displacement > Maintenance > Vapor Eliminator & Strainer Maintenance

RELIEVING INTERNAL PRESSURE

All internal pressures must be relieved before disassembly or inspection of the strainer, air eliminator, any valves in the system, the packing gland, and the front or rear covers. See “Relieving Internal Pressure” in Maintenance Requirements.

Servicing of the vapor eliminator and strainer involves occasional cleaning of the strainer, or, when required, replacing a float or sticking valve.

Tools necessary for disassembly:

•Flat blade screwdriver

•14mm box end or open end wrench

Follow the steps below to disassemble the eliminator and strainer:

Step 1

Disconnect the tubing between the differential valve and vapor eliminator cover. For the dual meter system, this may require removal of two segments of tubing.

Step 2

Remove the four screws on the Vapor Eliminator cover. Lift the cover to inspect the internal float assembly. Be careful not to damage the O-Ring seal.

If the float is crushed or damaged, remove cotter pin and replace float.

Step 3

Carefully inspect the sleeve valve for any resistance to smooth movement of the sleeve on the stem. Inspect all holes in the sleeve and the stem for foreign material, which could cause sticking of the valve and obstruct the flow through the valve. With the float removed, the sleeve must move on the stem by its own weight. If defective, replace sleeve and stem assembly.

NOTE: The vent hole is larger than the cotter pin hole used to attach the sleeve to the float. If replacing the sleeve, ensure that the sleeve is in the correct orientation with the larger hole on top.

Step 4

Inspect the vapor eliminator cover o-ring and o-ring groove. The groove in which the o-ring is located must be free of dirt. The flat face against which the o-ring seats must be clean and free of nicks and dents that may allow product to leak past the o-ring seal. Replace the o-ring seal, if necessary.

Step 5

Remove the four screws on the strainer cover. Remove the cover and pull the strainer out straight and level being careful not to drop trapped debris into the strainer housing.

Clean out strainer with compressed air, inspect for any breaks or other defects, and replace if necessary. Then reinstall the strainer.

Step 6

Inspect the strainer cover rubber seal and seal groove. The groove in which the rubber seal seats must be clean and free of dirt. The flat face against which the seal seats must be clean and free of nicks and dents that may allow the product to leak past the seal.