Model 730-RV Diaphragm Control Valve
Pilot Operated
For pressure reducing service, back pressure control or pressure relief on
application handling de-ionized water, slurries, corrosive or abrasive liquids, or any
service which requires a diaphragm type valve.
The assembly consists of a No. 630 air-operated diaphragm valve either normally open or
normally closed as desired, a No. 60-P pressure pilot and optional No. 1725 chemical
attachment, valve positioner and single or dual limit switches.
For back pressure control or pressure relief service a pressure sensing line is connected
to the chemical attachment on the pressure pilot from a point upstream from the main
valve.
For pressure reducing service the pressure sensing line must be from a point downstream
from the main valve.
Both normally open (spring open) and normally closed (spring closed) are available with or
without valve positioner and limit switches. Positioners are recommended for installations
where large fluctuations in flow and/or pressure are encountered, particularly on pressure
reducing applications.
The chemical attachment is furnished when the valve is to be used on slurries and
corrosive or abrasive liquids to isolate the pressure measuring element in the 60-P
pressure pilot.
For applications where close modulating control is required, the pressure pilot is
provided with an adjustable proportioning mechanism.
Because of the mechanism in the No. 60-P pneumatic pressure pilot, all Series 730 control
valves must be installed in an upright position.
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