5
Type FL
5. If the vent assembly (key 12, Figure 7) remains in the
pilot body, then it must be pointed down if possible or
otherwise protected. If the exhaust is to be piped to
the main valve exhaust or remotely vented, remove
the vent assembly and install tubing or piping into
the 1/4 NPT pilot exhaust connection. There are two
vent connections need to be piped away. Protect the
open end of the exhaust pipe by installing a screened
vent cap.
6. The pilot spring case vent (key 12, Figure 7) must be
kept open to atmospheric pressure. Protect the vent
assembly from icing, moisture, or debris that may cause
blockage, as required. To change the vent orientation,
twist the vent assembly in the spring case. To remotely
vent the pilot spring case, pilot body vent need to be pipe
away as well and install tubing or piping into the 1/4 NPT
spring case vent tapping. Protect the open end of the
vent line by installing a screened vent cap.
7. The Type PRX pilot connections are 1/4 NPT. Connect
the inlet control (sense) line from the “A” port, Figure 6
(key 55), on the bottom of the Type PRX pilot to a straight
run of pipe 6 to 10 pipe diameters from the relief valve or
backpressure regulator inlet as shown in Figure 2, using
3/8 inch / 9.5 mm or larger outside diameter tubing. If such
a distance is not practical, connect the control line away
from elbows, swages, nipples, or any area where abnormal
flow velocities occur.
Startup and Shutdown
CAUTION
If pressure is introduced first to the main
valve before the pilot, the main valve may
go wide-open and subject the downstream
system to full inlet pressure.
Note
The maximum inlet pressure for specific
constructions are given in Table 1. Use a
pressure gauge to monitor inlet pressure
during startup.
Relief Installation
Startup
1. Close vent valve (not shown).
2. Slowly open block valve and hand valve, if installed.
3. Adjust the pilot as needed.
Shutdown
1. Close block valve and hand valve, if installed.
2. Slowly open vent valve (not shown).
Backpressure Installation
Startup
1. Close upstream and downstream vent valves
(not shown).
2.
Slowly open upstream block valve first and then slowly
open downstream block valve.
3. Adjust the pilot as needed. If the pilot is not piped
downstream, make sure the pilot exhaust is pointed in
the correct direction.
Shutdown
1.
Close upstream block valve first and then close the
downstream block valve.
2. Open downstream and upstream vent valves
(not shown).
Pilot Adjustment (See Figure 7)
If set pressure adjustment is necessary, monitor relief (inlet)
pressure with a gauge during the adjustment procedure.
Loosen the locknut (key 2). Turn the adjusting screw (key 1)
into the spring case to increase the set pressure. Turn
the adjusting screw out of the spring case to decrease the
set pressure. When adjustment is completed, tighten the
locknut to lock the adjusting screw in position.
The adjustment of the relief valve or backpressure
regulator is performed by means of the pilot adjusting
screw, which varies the compression of the control spring.
Maintenance
The relief valve and backpressure regulator parts are subject to
normal wear and must be inspected periodically and replaced
as necessary. The frequency of inspection and replacement
depends on the severity of service conditions and on applicable
federal, state and local codes and regulations. Use only
replacement parts manufactured or furnished by Tartarini™.
!
WARNING
To avoid personal injury or property damage
from sudden release of pressure, isolate
the relief valve or backpressure regulator
from the pressure system, and release all
pressure from the pilot and main valve before
performing maintenance operations.
To prevent personal injury or damage to the
equipment during storage, installation or
maintenance operations, proper supports
shall be used to keep the Type FL relief valve
or backpressure regulator from rolling while
it is sitting on a flat surface.
