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Models 663W, 664W, 666W, and 668W are single
actuator controls. Each control is available with a wide
variety of switches. These units are long welded
chambers with nominal body diameters of 3” to 8”.
The long welded steel chamber totally encloses the
solid graphite displacer (S.S. displacer optional).
Connections are 1” NPT (flanged option). These units
are sized to meet your specific gravity and switching
differential needs. “W” chambers are also used for
interface service and when a stainless steel displacer
or special body length is required.
Pressure and temperature rating for these controls is
150 to 1500 psig at 500 ºF. Special materials of
construction available on request.
The standard specific gravity setting of the liquid is
specified in Table Below. If the specific gravity
of the liquid increases, the switching differential will
decrease. If the specific gravity of the liquid decreases,
the switching differential will increase. Consult the
factory with the application if the specific gravity of the
liquid varies more than 0.1 from the standard specific
gravity setting.
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