The HM57 Five Valve Manifold combines two shutoff
valves, two equalizing valves, and a vent/calibration
valve into a single, compact assembly. The double
equalizing arrangement insures against measurement
error that can occur from equalizer leakage
between high and low pressure connections, making
the HM57 ideal for custody transfer applications.
When expensive liquid or gas changes ownership,
precise measurement is critical. The smallest leakage
from the high side of the manifold to the low side
of the manifold can lead to lost revenue due to inaccurate
measurement. Therefore, when dealing with
custody transfer or other critical flows, a five valve
manifold should be used to achieve more accurate
measurement. The number of threaded connections
is greatly reduced when using the HM57 instead of
needle valves, piping and tees, and, with fewer connections,
there are fewer potential leak points and
reduced risk of fugitive emissions.