July 2020
Installation, Operation and Maintenance Manual
VA-DC-000-1803 Rev. 2
6
Section 1: Introduction
Introduction
1.10.3 When actuator is rst placed into service, it should be cycled with regulated
pneumatic pressure. This is necessary because the seals have been stationary,
causing them to take a "set". Therefore, the actuator should be operated through
several cycles to exercise the seals so as to achieve a service ready condition.
1.10.4 The actuator speed of operation is determined by a number of factors includes:
1. Power supply line length
2. Power supply line size
3. Power supply line pressure
4. Control valve and tting orice size
5. Torque requirements of the valve
6. Size of the actuator
7. Setting of speed controls
8. Hydraulic manual override (where available)
1.10.5 Due to the interaction of these variables, it is difcult to specify a "normal"
operating time. Faster operating time may be obtained by using one or more of
the following:
1. Larger supply lines
2. Larger control valve
3. Higher supply pressure *
4. Quick exhaust valves
* Not to exceed maximum operating pressure of actuator or control components
1.10.6 Slower operating time may be obtained by using ow control valves to meter the
exhaust. Excessive exhaust ow metering may cause erratic operation.
1.11 Actuator Operation
1.11.1 Controlled Operation: Controlled operation is accomplished by pressurizing and/or
depressurizing the appropriate cylinder inlet(s) of a Double-Acting. Do not exceed
pressures indicated on actuator nameplate.
1.11.2 Manual Operation: All pressure must be vented or equalized on both sides of the
pneumatic piston prior to manual operation.
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