Testing and adjustment – Flowserve 50165 Nordstrom Figure User Manual
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Nordstrom Figure 50165 and 50169 Dynamic Balance Iron Plug Valve FCD NVENIM2006-00 – 09/05
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Testing and Adjustment
It is reasonable to assume that a valve that has been properly inspected and installed will be in good
condition and ready to operate. However, the actual operability of a valve can only be proved by test.
A first observation can be made by actuating the valve through an open-close-open or close-open-close
cycle. If no obvious problems are observed, an actual test at pressure may then be applied while tight-
ness and operability are checked.
It is common practice after the installation of a piping system to clean the system by blowing through
the system with a gas or steam or flushing with a liquid to remove debris and/or internal protective films
and coatings. It should be recognized that valve cavities may form a natural trap in a piping system and
material not dissolved or carried out by the flushing fluid may settle in such cavities and adversely affect
valve operation.
a
Caution: If the system is being cleaned with a cleaning material (gas or liquid) different from
the line media, the effect of the cleaning material upon the valve sealant must be evaluated prior
to use.