Hydraulic main

(Gas Works) a horizontal pipe containing water at the bottom into which the ends of the pipes from the retorts dip, for passing the gas through water in order to remove ammonia.

See also: Hydraulic

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive
The ST80T comes as standard with diesel power units, hydraulic main lift and hydraulic top fold.
For maximum uptime and serviceability, active diagnostics of the hydraulic main valve monitors three critical parameters - spool position, voltage control and sensor monitoring.
One of the possible solutions is the incorporation of hydraulic accumulators in a hydraulic main. Hydraulic accumulators reduce pressure pulsation and the work of the hydraulic system becomes stable and equal.
Large diameter stems and large ports in the hydraulic main valve are designed to increase oil flow and minimize power loss across the main control valve.
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