13
Fig. 5 Two pressure reducing valves in parallel
Steam supply
] See Section 3.6
3.3 Pipeline sizing
The piping on both sides of the valve must be sized so that velocities do not exceed
30 m/s (98 ft/s). This means that a properly sized valve will often be smaller than the
connecting pipework.
3.4 Pipeline stresses
Line stresses caused by expansion or inadequate support should not be imposed on the
valve body.
3.5 Isolating valves
These should preferably be of the full bore type.
3.6 Removal of condensate
It is recommended that a separator with trap set is fitted upstream of the valve to ensure
dry steam conditions.
If there is a rise in the low pressure line from the valve then a further drain point should be
provided to keep the valve drained after shutdown.
Steam supply
] See Section 3.6
Fig. 6 Two pressure reducing valves installed in series
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