CSB700 Series
7
Vent Line Installation
CSB700 Series regulators have a 1 NPT screened vent
opening in the spring case. If necessary to vent escaping
gas away from the regulator, install a remote vent line in
the spring case tapping. Vent piping should be as short
and direct as possible with a minimum number of bends
and elbows. The remote vent line should have the largest
practical diameter. Vent piping on regulators with token relief
must be large enough to vent all relief valve discharge to
atmosphere without excessive backpressure and resulting
excessive pressure in the regulator.
For types with optional token relief, this low capacity relief
is located in the spring case of the primary regulator. If
necessary to vent escaping gas away, install a remote vent
line in the spring case tapping of the primary regulator as
described above. Periodically check all vent openings to be
sure that they are not plugged or obstructed.
For Types CSB700/CSB700F/CSB720/CSB720F, outlet
pressure higher than 0.34 bar / 5.0 psig above the setpoint
may damage internal metallic parts. For Type CSB750,
outlet pressure higher than 1.5 bar / 21.8 psig above the
setpoint may damage internal metallic parts.
Overpressure Protection
The recommended pressure limitations are stamped on
the regulator nameplate. Some type of overpressure
protection is needed if the actual inlet pressure exceeds the
maximum operating outlet pressure rating. Overpressure
protection should also be provided if the regulator inlet
pressure is greater than the safe working pressure of the
downstream equipment.
Regulator operation below the maximum pressure limitations
does not preclude the possibility of damage from external
sources or debris in the line. The regulator should be
inspected for damage after any overpressure condition.
Startup
The regulator is factory set at approximately the midpoint
of the spring range or the pressure requested, so an initial
adjustment may be required to give the desired results.
With proper installation completed and relief valves properly
adjusted, slowly open the upstream and downstream
shutoff valves.
Adjustment
Note
For types that include the slam-shut module,
refer to the instruction manual for Type VSX8
slam-shut for adjustment and maintenance
of the slam-shut.
To change the outlet pressure, loosen the hex nut and turn
the adjusting screw clockwise to increase outlet pressure or
counterclockwise to decrease it. Monitor the outlet pressure
with a test gauge during the adjustment. Tighten the hex nut
to maintain the desired setting.
Taking Out of Service (Shutdown)
!
WARNING
To avoid personal injury resulting from
sudden release of pressure, isolate
the regulator from all pressure before
attempting disassembly.
Figure 1.
Type CSB704 Downstream Control Line Installation
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
M1063
PRIMARY REGULATOR
SLAM SHUT
UPSTREAM BLOCK
VALVE
DOWNSTREAM
BLOCK VALVE
MINIMUM OF 6 X
OUTLET PIPING
DIAMETER
