CVS Controls Ltd
Product Manual: CVS Type 67AFR Filter Regulator
3
Installation continued
CVS Controls sets each regulator for the pressure
setting specified at the time of ordering. If no
setting was indicated, the outlet pressure will be
set at the midrange of the control spring.
Startup
Refer to Figure 2 for Key Numbers.
After completion of installation and adjustment of
downstream equipment, introduce pressure to the
unit by slowly opening the upstream and
downstream shutoff valves. During any startup or
adjustment, monitor the adjustment using
pressure gauges. Outlet pressure of the regulator
can be monitored using a gauge installed at a
downstream position, including the supply
pressure gauges of a pneumatic instrument where
the regulator is providing reduced pressure. If the
regulator has a tapped side outlet a gauge (Key
20, not shown) may be installed for monitoring. If
the regulator has no gauge but the side outlet has
been tapped and plugged, the side plug may be
removed and a temporary gauge installed.
During the adjustment procedure monitor the
outlet pressure with a gauge, if outlet pressure is
necessary; adjust the standard CVS Type 67AFR
regulator by loosening the locknut (Key 2) and
turning the adjusting screw or handwheel (Key 1).
Clockwise adjustment will increase the outlet
pressure setting, and counter-clockwise
adjustment will decrease the outlet pressure
setting. On some regulators, a closing cap (Not
shown) will have to be removed prior to
adjustment and replaced afterward. Locknuts or
handwheels are not used on panel-mounting
regulators.
Shutdown
1.
Close the nearest upstream shutoff valve.
2.
Close the nearest downstream shutoff valve.
3.
Open the downstream vent valve and release
the pressure.
4.
Open the upstream vent valve and release the
pressure.
5.
If vent valves have not been installed, safely
bleed off inlet and outlet pressure and ensure
that the regulator contains no pressure.
Maintenance
Due to normal wear, internal parts must be
inspected and replaced regularly depending upon
the severity of service conditions. High pressure
drops and large amounts of impurities in the flow
stream accelerate wear on regulator and valve
parts.
To empty moisture from the filter cap (Key 9), by
periodically open the drain valve (Key 11).
Warning
Prior to performing maintenance operations,
isolate the unit from the pressure system and
vent all internal pressure.
Perform the following procedures when changing
the control spring or to inspect, clean or replace
any other parts.
Note
If the regulator has been installed with
sufficient clearance, the body assembly may
remain mounted on other equipment or in a
line or panel during maintenance.
To access the diaphragm assembly (Key 12),
control spring (Key 5) or upper spring seat (Key 3):
1.
Loosen the locknut (Key 2, if used) and turn
the adjusting screw (Key 1) counterclockwise
to remove all compression from the spring.
2.
Remove the machine screws (Key 18) and
separate the body assembly from the spring
case (Key 4).
3.
Inspect the removed parts and replace if
necessary.
4.
Ensure the registration (Sensing) hole is free
from debris and reassemble.
5.
Verify the proper control spring setting
according to the “Startup” instructions and re-
mark the control spring label if necessary.