Data Sheet

Bulletin 71.1:133
5
Type 133L
A6555
July 2009
Type 133L
BALANCING
DIAPHRAGM
REGISTRATION DISK
A6555 A6883
TYPE 133L REGULATOR
Figure 4. Operational Schematics
stabilizeragainsttheoriceplate.Airowingthrough
the webs of the upper stabilizer opens the lower
stabilizer (see Figure 5). With the regulator at steady-
state conditions, both stabilizers are closed and only a
small hole is open to help stabilize normal operation.
Installation
The regulator may be installed in any position but is
normally installed with the actuator portion vertical
above the body portion. Flow through the body must
beinthedirectionindicatedbytheowdirectionarrow
cast on the body portion. A downstream control line is
required for operation of the regulator.
A remote vent line may be required for some
installations. Vent openings must be protected against
the entrance of rain, snow, insects, or any other
foreign material that may plug the vent.
External dimensions are shown in Figure 9.
Overpressure Protection
As is the case with most regulators, the 133 Series
regulators have outlet pressure ratings that are
lower than the inlet pressure ratings. Some type of
Overpressure Protection is needed if the actual inlet
pressure ever exceeds the outlet pressure rating.
Maximum inlet and outlet pressures for the 133 Series
are given in Table 2. All models must be protected
against inlet pressure above the maximum emergency
inlet pressure (refer to Table 2).
Outlet pressure more than 3 psig / 0.21 bar for
Types 133H, 133L, and 133Z, or 40 psig / 2.8 bar for
Type 133HP over the outlet pressure setting of the
regulator may damage internal parts such as the
diaphragm plate and valve disk.
Regulator operation below these emergency pressure
limitations does not preclude the possibility of damage
Type 133HP
A6883
June 2009
Type 133HP
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
BOOST PRESSURE
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
INTERMEDIATE PRESSURE
PILOT SUPPLY PRESSURE
VACUUM PRESSURE
TANK PRESSURE
VAPOR PRESSURE
LOADING PRESSURE
RELIEF PRESSURE
BOOST PRESSURE
TYPE 133HP REGULATOR
CONTROL SPRING
DOWNSTREAM
CONTROL LINE
VALVE DISK
ORIFICE
STEM
DIAPHRAGM
VENT
ASSEMBLY
DOWNSTREAM
CONTROL LINE
DIAPHRAGM
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
BOOST PRESSURE
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
BOOST PRESSURE