Instruction Manual

299H Series
8
In many instances, it will be necessary to enlarge the
downstream piping to keep ow velocities within good
engineering practices. Expand the piping as close to
the regulator outlet as possible.
WARNING
!
Adjustment of the pilot control spring to
produce an outlet pressure higher than
the upper limit of the outlet pressure
range for that particular spring can cause
personal injury or equipment damage due
to bursting of pressure-containing parts
or the dangerous accumulation of gases
if the maximum actuator emergency
casing pressure is exceeded. If the
desired outlet pressure is not within the
range of the pilot control spring, install a
spring of the proper range according to
the Maintenance section.
Each regulator is factory-set for the pressure setting
specied on the order. If no setting was specied,
the outlet pressure is set midrange of the pilot control
spring. In all cases, check the control spring setting to
make sure it is correct for the application.
Registration Conversion
To convert the 299H Series regulators from one type of
registration to another, all that is required is adding or
removing screws and O-rings.
To change an internal registration regulator to an
external registration regulator with a downstream
control line, block the two ports in the throat with
screws and O-rings (J in Figure 2). Remove either the
3/4 NPT pipe plug in the pilot casing or the 3/4 NPT
pipe plug in the lower casing and add a downstream
control line.
To convert an external registration regulator to a dual
registration regulator, remove the two screws and
O-rings (J in Figure 2) from the throat and use a screw
and an O-ring to block the port (G in Figure 2) between
the lower diaphragm chamber and pilot diaphragm
chamber. Remove the 3/4 NPT pipe plug in the pilot
lower casing and add a downstream control line.
Type VSX-2 Slam-Shut Device
To convert the Type VSX-2 from one type of
registration to another, all that is required is adding or
removing a screw and gasket.
To change an internal registration Type VSX-2 to an
external registration Type VSX-2 with downstream
control line, block the body pitot tube with a screw
and gasket (keys 10 and 11, Figure 7). Remove the
pipe plug in the Type VSX-2 and add a downstream
control line.
Type VSX-2 Installation
Note
The Type VSX-2 slam-shut module
should be mounted so that the spring
case vent points towards the ground.
Keys are referenced in Figure 7. Place new O-rings
(keys 2 and 3) on the Type VSX-2 and slide the
module into the Type 299HS body (key 17). Secure
the Type VSX-2 to the Type 299HS body with the four
set screws (key 4). The Type VSX-2 device may be
oriented in any direction with respect to the sensor
line connection.
Startup
With proper installation completed and downstream
equipment properly adjusted, perform the following
procedure while monitoring the pressure with gauges.
1. Very slowly open the upstream block valve.
2. On a Type 299HS, the Type VSX-2 is shipped in
the tripped position and will need to be reset. If the
Type VSX-2 is a high trip only, it can be reset before
starting the regulator. If the Type VSX-2 is a high
and low trip, the regulator will need to be started
and the downstream system pressurized before the
Type VSX-2 can be reset. See the section for
Type VSX-2 reset.
3. Slowly open the hand valve (if used) in the
control line. The regulator will control downstream
pressure at the pilot control spring setting. See
the Adjustment section following these numbered
steps if changes in the setting are necessary
during the start-up procedure.
4. Slowly open the downstream block valve.
5. Slowly close the bypass valve, if used.
6. Check all connections for leaks.
Adjustment
Keys are referenced in Figure 4. The only adjustment
on a 299H Series regulator is the reduced pressure
setting of the pilot control spring (key 32). Remove
the closing cap (key 29) and turn the adjusting screw