Cashco 1049 - Manual (Page 2)

IOM-1049
Standard Configuration
Internal Sensing, SS Pilot Filter Element and
Pilot Exhaust to Atmosphere
InstallatIon dIaGraMs For standard accessorIes & conFIGuratIons
option 1
With Pilot Exhaust Tubed to Main Valve Outlet
option 2
With Remote Sensing
option 3
With Manual Blowdown Valve
The inlet is vertical and the outlet is horizontal. The
valve should be installed in the normal upright position
with the cap at the top of the valve and the valve inlet at
the bottom. The outlet is to the side.
For valves using the remote sensing port connection,
sense lines should be a 1/2” O.D. tube or larger and the
length should not exceed fifteen feet. Longer lengths
may be used with larger diameter sense lines. The
sense line should slope downward from the sense port
to the tank to allow condensate, if any, to drain back
into the tank and not block the sensing capability.
VALVES WITH PURGE ROTAMETER
For valves with a rotameter mounted for purging either
the pilot sense line only or both pilot sense and dis-
charge lines, connect the purge gas source, usually dry
nitrogen, to the 1/4” FNPT connection at the bottom of
the rotameter. The pressure of the purge gas source
must be higher than the set pressure of the vent valve,
but not to exceed the maximum pressure rating of the
rotameter. (Standard rotameter supplied by Valve Con-
cepts is rated to 50 psig.) Once the gas source is con-
nected, the purge flow can be adjusted by turning the
knob at the top of the rotameter and observing the flow
indicator. The purge mechanism is designed not to af-
fect the set pressure of the vent valve.
When the tank pressure is below set pressure, the main
valve seat will be closed. If the rotameter is mounted
to purge both the pilot sense and discharge lines, there
will be a very small flow to the valve outlet from the
purge mechanism.
VALVE WITH AIR OR N2 ASSIST:
For valves with air or nitrogen assist pilot, connect the
gas source to the 1/4” FNPT connection at the inlet of
the filter regulator. The pressure must be a minimum of
5 psig, but not to exceed the maximum pressure rating
of the filter regulator. (The standard filter regulator sup-
plied by Valve Concepts is rated at 300 psig.)