Emerson Bettis Nuclear Series Bedienungsanleitung
Operation and Maintenance Manual
VA065043 Rev. E
June 2014
Bettis Nuclear Series Actuators
Installation and Operation Manual
VA065043 Rev. E
Table of Contents
June 2014
I
Table of Contents
Table of Contents
Section 1: General
Section 2: Storage
Section 3: Installation
Section 4: Start-Up
Section 5: Operation of Emerson Actuator
5.1 Controlled Operation.................................................................................. 5
5.2 Manual Operation....................................................................................... 5
Section 6: Maintenance
6.1 Service Interval ........................................................................................... 6
6.2 Lubrication Requirements........................................................................... 7
Section 7: Spare Parts
Section 8: Document Revision
June 2014
Installation and Operation Manual
VA065043 Rev. E
1
Section 1: General
General
Section 1: General
All Nuclear qualified actuators have a model number starting with an Nprefix.
In order to ensure and maintain the present level of qualification and auditability
to the Emerson Qualification Report Number VA037274 and VA600529, Emerson
requires that any maintenance or service work be performed by well-trained,
equipped, prepared and competent personnel.
Installation and Operation Manual
VA065043 Rev. E
June 2014
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Section 2: Storage
Assembly and Valve Adaptation
Section 2: Storage
For applications where the actuator is not put into immediate service, it is
recommended that the actuator be cycled by clean dry air or nitrogen pressure at
least once a month. Indoor storage, if available, is recommended for all actuators.
Care should be taken to plug the cylinder ports, control valve ports and body ports
to keep out foreign particles and moisture. Also, actuators should not be stored in
an atmosphere harmful to resilient seals. For extended storage, contact the factory.
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Installation and Operation Manual
VA065043 Rev. E
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Section 3: Installation
Installation
Section 3: Installation
1. Since there are many valve and actuator combinations, it is not practical to
include detailed instructions for each type. Mountings are designed to be
as simple as possible to keep guesswork out of installation. Actuators are
shipped from the factory with the travel stops adjusted for approximately
ninety degree rotation. Generally, it is necessary to make slight stop
adjustments once the actuator is installed on the valve. Refer to the valve
manufacturer's recommendations for specific requirements. When the valve
has internal stops, the actuator should be adjusted at the same points.
NOTE:
The actual "stopping" should be done by the actuator. If the valve does not have
internal stops, adjust the actuator to the full-open position. Using this as a reference
point, rotate the valve closed and adjust to the valve manufacturer's specifications for
total rotation.
2. Good instrument practices are also recommended. Clean, dry air or gas is
essential for long-service life and satisfactory operation. It should be noted
that new air lines often have scale and other debris in them. This debris can
damage control valves, solenoids, seals, and others.
Installation and Operation Manual
VA065043 Rev. E
June 2014
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Section 4: Start-Up
Start-Up
Section 4: Start-Up
1. When the actuator is first put into service, it should be stroked. This is necessary
because the seals and packings having been stationary, causing them to take
a "set". Therefore, the actuator should be operated through several cycles,
exercising the seals and packings, resulting in a service ready condition.
2. The actuator speed of operation will be determined by a number of factors including:
a. Power supply line length
b. Power supply line size
c. Power supply line pressure
d. Control valve and fitting orifice size
e. Torque requirements of the valve
f. Size of actuator
g. Setting of speed controls
h. Pressure of hydraulic manual override with internal adjustable speed
controls
3. Due to the interaction of these variables, it is difficult to specify a "normal"
operating time. Faster operating times may be obtained by using one or more
of the following:
a. Larger supply lines
b. Larger control valves
c. Higher supply pressure (not to exceed minimum operating pressure
of actuator or control components)
d. Quick exhaust valves
4. Slower operating times may be obtained by using flow control valves to
meter the exhaust. Excessive exhaust flow metering may cause erratic
operation; incoming supply should not be metered.
June 2014
Installation and Operation Manual
VA065043 Rev. E
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Section 5: Operation of Emerson Actuator
Operation of Emerson Actuator
Section 5: Operation of Emerson Actuator
5.1 Controlled Operation
Controlled operation is accomplished by pressurizing and depressurizing to the
appropriate cylinder inlet(s) of a double-acting or spring-return unit(s) by means
of an appropriate control valve. Do not exceed pressures indicated on the actuator
nameplate.
5.2 Manual Operation
All pressure must be vented or equalized on both sides of the power piston prior to
manual operation. Lubricate the exposed screw threads with ESLN-6 lubricant, loosen
jam nut and rotate drive screw in appropriate direction to operate actuator and valve.
Installation and Operation Manual
VA065043 Rev. E
June 2014
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Section 6: Maintenance
Maintenance
Section 6: Maintenance
6.1 Service Interval
1. Routine maintenance is generally unnecessary. "N"-Series actuators are qualified
with a specific cycle life between service intervals. Six hundred twenty five
(625) cycles or five (5) years is the required service interval for legacy “N”-
Series actuators and three thousand (3,000) or fifteen (15) years for the new
generation “N”-Series actuators. The actuator must be removed from the
valve to perform the required service and maintain qualification. The actuator
must be disassembled, cleaned, wear inspected, all worn parts replaced, re-
lubricated, and all seal/gaskets replaced. Failure to observe required service
intervals will void the qualification of the actuator. It is recommended that
service kits be ordered approximately three (3) months prior to scheduled
maintenance to ensure availability.
NOTE:
Storage time counts as service time.
NOTE:
Legacy actuators include NCB, NHD, and NT Series actuators.
New generation actuators include NCBB, NCBA300 and NG Series actuators.
2. For availability of technicians and equipment to perform required actuator
service, contact Emerson or their authorized nuclear representative.
3. For actuators normally used in nuclear service, all bearing surfaces are gen-
erally coated with a molybdenum disulfide or Ryton coatings and corrosion
inhibitor.
All threaded fasteners, bearing surfaces, tracks, rollers, pins, yoke bores, gas-
kets and seals are coated with the provided ESLN-6.
4. On "NT" Series actuators only, lubricant fittings are provided as a means of
supplemental lubrication of the yoke trunnion bearing surfaces. Lubrication of
the yoke trunnion is accomplished most effectively by applying lubricant while
actuator is in motion. This assures maximum dispersion of the lubricant.
5. If the speed of operation changes, becoming increasingly slower, the supply
line filter should be checked for possible collection of debris.
6. All control valves, filter regulators, positioners, limit switches, and others,
require periodic maintenance. Consult manufacturers operating and
maintenance instructions for their requirements, procedures, and maintenance
intervals.
June 2014
Installation and Operation Manual
VA065043 Rev. E
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Section 6: Maintenance
Maintenance
6.2 Lubrication Requirements
For nuclear service, use Emerson provided ESLN-6.
NOTE:
This product is only intended for use in large-scale fixed installations excluded from the
scope of Directive 2011/65/EU on the restriction of the use of certain hazardous
substances in electrical and electronic equipment (RoHS 2).
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