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LARGE
D-Stop
Partial Stroke Test Devices
Metal-to-Metal
Safety:
The D-Stop physically prevents the valve from moving past
the specified test point.
Once the D-Stop is engaged, the valve cannot move past the set
point. (See photos below)
- Theory:
Electronic systems rely on instrumentation, software and controls
to limit valve travel past the set point to closure.
- Reality:
The valve is in a real pipe with real process flowing through it.
If the valve closes there may occur anything from loss of revenue
to a catastrophic event, depending on the plant and the
application. Obviously if you can tolerate the valve
closing, you do not need a Partial Stroke Test Device.
Solution:
When performing Partial Stroke Testing:
Keep it safe, keep it simple – specify D-Stop!
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 Photo
to the left is a fabricated DT 260 D-Stop in factory assembly.
Note the engagement cam has not been installed. This unit is
manufactured of special materials for low temperature application.
Remember!
DynaTorque manufactures D-Stops up to 4,000,000 in-lb.
capability! |
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Picture at right shows the same DT 260, but with the engagement cam now
installed.
Photo shows the engagement cam not engaged.
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Bottom photo shows the D-Stop fully
engaged with Metal-to-Metal Safety, preventing the valve from going
to the closed position during the test mode.
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