Snap Action Ball Float Drain Traps


For loads to 1,950 lb/hr (885 kg/hr) . . .
Pressures to 1,000 psig (69 bar)

Continuous flow or on-off float drain traps

Armstrong’s line of snap action drain traps includes two basic models
available in cast iron and forged steel. The floats are light enough to
handle light liquids.

No. 71-A—Wide-open, tight-shut drain trap for use
where fine dirt and grit may be present or where liquid load is light. A
flat spring in the leverage system holds the valve closed until the
trap body is nearly full of water. Then it snaps open, washing dirt
through. When the trap body is nearly empty, the spring snaps the valve

No. 71-315—Forged steel version of No. 71-A.

CAUTION: Ball float drain traps are
not recommended where heavy oil, sludge or considerable dirt are
encountered in lines. Under these circumstances, use Armstrong inverted
bucket BVSW traps.


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For help in specifying the exact model you need, download the product literature.

Product Literature

Installation and Maintenance

Submittal Drawing 
Snap Action Ball Float Drain Traps

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