For single-acting actuators, tubing for port “4” is always to the
pneumatic side of the actuator regardless of air action. Port “2”
is plugged. See Figure 9: Linear, Single Acting, Air to Open.
Figure 9: Linear, Single Acting, Air to Open
5.3 Connect Supply Port
In applications where the supply pressure is higher than the
maximum actuator pressure rating of the supply, a regulator is
required to lower the pressure to the actuator’s maximum
rating.
DANGER: Exceeding the maximum actuator supply
pressure may cause the actuator to explode, causing death,
injury or property damage.
5.4 Purging
Purging allows the non-pressurized side of a single acting
actuator to fill with clean exhaust gas instead of moist
atmospheric air. This configuration helps prevent corrosion of
actuator components in harsh environments. Figure shows
the purging configuration. Contact your local FLOWSERVE
Representative for more information regarding the purging
option.
Figure 10: Purging
5.5 Venting
Venting for the Logix 3800zb controlled 4-Way valve block
happens at ports “3” and “5” to the atmosphere. When supply
air is substituted with sweet natural gas, piping must be used
to route the exhausted natural gas to a safe environment.
Speed control valves may be installed at ports “3” and “5” to
adjust flow to the actuator. See Figure 11: Exhaust Vent
Figure 11: Exhaust Vent
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