Type 310A
7
7. Install a hand valve in the control line.
8. Install the other end of the downstream control
line to the 1/2 NPT connection in either side of the
case body (key 1, Figure 10 or 11).
9. Consult the appropriate Instruction Manual
for installation of an optional pneumatic or electric
remote control-drive unit. For optional remote
pneumatic loading of a Type 32A pilot, make the
spring case piping connections just as they would
be made for remote venting.
Prestartup Considerations
Each regulator is factory-set for the outlet pressure
specified on the order. If no setting was specified,
outlet pressure was factory-set at the mid-range of
the pilot control spring. Before beginning the startup
procedure in this section, make sure the following
conditions are in effect:
• Block valves isolate the regulator
• Vent valves are closed
• A bypass, if any, is in operation
In all cases, check the control spring setting to make
sure it is correct for the application.
CAuTIOn
Pilot supply pressure must be
introduced into the regulator before
introduction of any downstream
pressure, or internal damage may occur
due to reverse pressurization of the pilot
and main valve components.
Pressure gauges should always be used
to monitor downstream pressure during
startup. Procedures used in putting this
regulator into operation must be planned
accordingly if the downstream system is
pressurized by another regulator or by a
manual bypass.
note
Pilot supply pressure must be at least
15 psig (1,0 bar) greater than control
pressure to operate the regulator at
rated travel.
Although remote loading or control constructions
may require separate adjustments on associated
equipment, the only adjustment normally necessary
on a Type 310A-32A regulator is the pressure setting
of the pilot control spring. Turning the adjusting
screw clockwise into the spring case increases the
spring compression and pressure setting. Turning
the adjusting screw counterclockwise decreases the
spring compression and pressure setting.
Pilot Adjustment
To adjust a standard Type 32A pilot, loosen the locknut
(key 4, Figure 9), and turn the adjusting screw (key 3,
Figure 9). Then tighten the locknut to maintain the
adjustment position.
Startup
1. Open the upstream block (isolating) valve. Open
hand valve A in the external pilot supply line
before opening the downstream isolating valve
(See Figure 6).
2. Open the downstream block (isolating) valve for
minimum flow.
3. Slowly open hand valve B in the downstream
control line, while at the same time adjusting the
pilot setting, if necessary.
4. Completely open the downstream block valve.
5. Slowly close the bypass valve, if any.
Wide-Open Monitor Regulator
Installation
1. For both the wide-open monitoring regulator
and the working regulator, perform the Single-Pilot
Regulator Installation procedures through step 9.
2. Connect the control line of a wide-open monitoring
regulator (Figure 7) to downstream piping near
the working regulator control line connection.
During normal operation the wide-open monitoring
regulator stands wide-open with the pressure
reduction being taken across the working
regulator. Only in case of working regulator failure
does the wide-open monitoring regulator take
control at its slightly higher setting.
Prestartup Considerations
Each regulator is factory-set for the outlet pressure
specified on the order. If no setting was specified,
