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A survey was required for a hardboard manufacturer in the basement area
of a large 'press' to try and establish whether any hydraulic faults were apparent in the valvegear.
A recurring problem with the press suddenly opening during the compression stage had been occurring with increased
frequency.
During the test it quickly became apparent that valve 'C' was bypassing significantly, the temperature of the return
pipe rose from around 23 degrees to in excess of 32 degrees.
Little change in temperature was noted from the other five valves.
The valvegear and surrounding equipment were scanned prior to and during the test. The ambient temperature was
approximately 20 degrees Celsius. Whilst the temperature of all the valves rose to around 25 degrees (working fluid
circulates above the valves during compression), only valve 'C' indicated any significant change in the temperature
of the return pipe (rising to above 32 degrees).
Images of all the valves were recorded and samples are reproduced below. Note also the image of the return manifold
which also clearly indicates that working fluid (normal temperature around 38 degrees) is flowing in the return
from valve 'C'.
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Valve 'B'
Valve 'C'
Return Manifold
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