The 270A Series valves are direct feed High Side level controls. Mounted in a
chamber balanced to a vessel, or directly in a sump, a rise in liquid level will open
the orifice and allow the liquid to flow downstream.
These valves have a simple needle and seat construction. The 270A valve has a
single port, but the 270AX and 270AY valves are balanced port valves, allowing
their use with larger orifices and at greater pressure drops across the valve.
These valves are generally applied to refrigeration systems with a fixed charge.