CVS Controls Ltd
Product Manual: CVS Type 1301F and 1301G Regulator
Start Up
When the regulator has been installed and
downstream equipment has been adjusted, the
regulator can be pressurized.
Using gauges to monitor the pressure slowly open
upstream and downstream block valves during start
up and while performing any adjustments.
If adjustment is required loosen the locknut (Key 11)
and turn the adjusting screw (Key 1) either clockwise
to increase the set pressure or counter-clockwise to
decrease the set pressure. Monitor the pressure
during the adjustment using pressure gauges. When
the adjustment is complete, tighten the locknut. If
the desired outlet pressure is not within the range
specified by the regulator spring, refer to the
“Maintenance” section of this guide and install the
spring that suits the desired range.
Shutdown
To shutdown the regulator, close the upstream
shutoff valve, then close the downstream shutoff
valve. Open the vent valves between the regulator
and the downstream shutoff valve then open the
vent between the regulator and the upstream shutoff
valve. If vent valves have not been installed, safely
bleed off both inlet and outlet pressures and ensure
that the regulator contains no pressure.
Maintenance
Regulator maintenance should be done as required
by local regulations, and as necessary due to normal
wear and tear. Frequency of inspection and parts
replacement should be done according to severity of
service.
WARNING
Prior to performing any maintenance or
disassembly, isolate the regulator from system
pressure and relieve all internal pressure.
Performing maintenance while the regulator is
pressurized could result in injury, equipment
damage or explosion of accumulated gas.
Disassembly
These steps describe how to completely disassemble
the regulator. To perform inspection or replace parts,
complete only the steps necessary for the specific
job. Refer to Figure 2 for key numbers unless
otherwise indicated.
1.
Loosen the locknut (Key 11) and release
spring compression by turning the adjusting
screw (Key 1) counterclockwise.
2.
Remove the bottom cap (Key 9), bottom cap
gasket (Key 8) and spring (Key 3).
3.
Remove the valve disk assembly (Key 19)
from the yoke (Key 17).
4.
Remove the valve disk collar (Key 10) from
the valve disk assembly.
5.
Remove the spring case cap screws (Key 5)
and separate the spring case (Key 2) from the
regulator body (Key 6).
6.
Remove the upper spring seat (Key 12) and
spring (Key 3).
7.
Refer to Figure 3 and unscrew the diaphragm
locknut (Key 4). Remove the diaphragm plate
(Key 13), the two diaphragms (Key 13) and
the diaphragm plate gasket (Key 7).
8.
Remove the yoke screws (Key 15) and lift the
lower and upper halves of the yoke out of the
body.
9.
Unscrew the orifice (Key 18) and examine the
seating edge. If the seat is worn or nicked,
replace with a new part.
CVS Controls Ltd.
3
Process Management
and Instrumentation
