OPERATION
Ernst Flow Industries™ ball check valves are designed to isolate the gauge glass from the
vessel in the event of a gasket or glass rupture. The stem of a Ernst Flow Industries™ ball
check valve has an extended needle feature to dislodge the ball check when needed.
In the closed position, the needle portion of the valve stem extends through the valve seat
and prevents the ball check from sealing against the ball check (backside) seating surface.
In the open position, the needle portion of the stem is retracted into the valve seat allowing
the ball check to isolate in the event of a gauge failure causing rapid flow of fluid from the
vessel to the gauge.
In order for the ball check to operate properly, the valve stem must be in the 100% open
position to ensure that the extended needle does not prevent the ball check from seating.
CAUTION: Rapid opening of valves can cause glass breakage and / or possible injury to
personnel.
For protection during shipments, packing gland is loosened and stem is in the open position.
Adjust stem and packing after installation. Do not tighten packing more than enough to stop
leakage.
Crack open the valves carefully, and wait until equipment is fully warmed up and / or
pressure is equalized before opening valves all the way.
CAUTION: While the valves are in operation, they must be in their fully open position. A
partially open valve will prevent automatic ball checks from seating which could
result in physical injury to personnel and loss of product.
CAUTION: When a valve must be closed to dislodge a seated ball check, there is a brief
period of time after the needle contacts the ball, but before the stem contacts
the seat, when fluid is free to pass through the seat and into the gauge.
Therefore, an operator could be injured and/or fires may result if hazardous
liquids are involved. Primary block valves should be closed first and the ball
check valves should be closed as rapidly as possible in this situation.
3
16633 Foltz Parkway, Strongsville, OH 44149
Tel 800-992-2843 www.ernstflow.com info@ernstflow.com
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