Flowserve APEX 8000 Series Installation Operation & Maintenance
Flowserve APEX 8000 Series Installation Operation & Maintenance

Flowserve APEX 8000 Series Installation Operation & Maintenance

Automax valve automation systems.high-performance positioner

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Automax Valve Automation Systems
APEX 8000 High-Performance Positione
FCD AXENIM0130-00

Principles of Operation:

This bulletin is designed to assist in installing, calibrating, troubleshooting and performing maintenance as required for
the APEX 8000 Series high-performance positioner.
Product users and maintenance personnel should thoroughly read and strictly follow the instructions contained in this
bulletin prior to operating the positioner. Any questions concerning this product should be directed to a Flowserve
representative
To avoid possible injury to personnel or damage to valve parts, WARNING and CAUTION notes must be
strictly followed. Modifying this product, substituting non-factory parts or using maintenance procedures
other than outlined could drastically affect performance and be hazardous to personnel and equipment.
The APEX 8000 high-performance positioner is a two-stage device and is designed for use in control loops where fast
response is required. The APEX 8000 positioner is designed to be modular and use the P/P module for 3-15 psi input
signal or the NT 3000 Series Transducer Module for 4-20 mA input signal.
The APEX 8000 high-performance positioner is designed as a four-way device, but can easily be converted to a
three-way device by plugging one of the output ports.
NOTE: The APEX 8000 high-performance positioner must use the I/P NT 3000 Transducer. The I/P 2000 Transducer
is not acceptable for use with the APEX 8000 Series Positioner.
The APEX 8000 positioner can handle supply pressures up to 150 psi; thus, a supply regulator is usually not
required. However, a five micron air filter is required for pneumatic positioners and a coalescing filter is required for
I/P positioners.
NOTE: The air supply should conform to ISA Standard S7.3 (a dew point at least 18° F / -8° C below ambient
temperature, particle size below 5 microns, oil content not to exceed one part per million).
The APEX 8000 Series positioner features an adjustable gain of 400-1100:1. The medium gain setting is standard for
smaller actuators, while the high gain setting is used on larger actuators (refer to 'Gain Adjustment Procedure' section
for further details.)
OPERATION:
The positioner schematic (Figure 1) shows an APEX 8000 Series positioner connected for double-acting service on a
rotary rack-and-pinion actuator. Tension on the feedback spring provides feedback to the positioner, which varies as
the stem position changes. The spring-loading force is applied through the feed-back linkage and cam to the
positioner's input capsule.
Instrument signal pressure is applied between the diaphragms in the input capsule. Therefore, the input capsule
serves as a force-balance member, matching the valve stem position (as measured by tension on the feedback
spring) to the instrument signal.
r
Operation
Maintenance

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Summary of Contents for Flowserve APEX 8000 Series

  • Page 1 5 microns, oil content not to exceed one part per million). The APEX 8000 Series positioner features an adjustable gain of 400-1100:1. The medium gain setting is standard for smaller actuators, while the high gain setting is used on larger actuators (refer to ‘Gain Adjustment Procedure’ section for further details.)
  • Page 2 When the opposing forces balance exactly, the system will be in equilibrium and the stem will be in the exact position called for by the instrument signal. If the opposing forces are not in balance, the input capsule will move up or down and, by means of the pilot-valves, will change the output pressures, moving the stem until the tension on the feedback spring exactly opposes the instrument signal pressure Figure 1: Apex 8000 Positioner Schematic for Air-to-Open...
  • Page 3 Installation of APEX 8000 Series Positioner on Actuators: The APEX 8000 can be installed on most sizes of rotary and linear actuators. Actuators can be either double acting or spring return. Cams can be used for direct acting or reverse acting directions. These instructions apply to rotary actuators only.
  • Page 4 Cam Removal : Disconnect cam return spring. With a wrench carefully placed on the output shaft (if necessary), loosen and remove the jam nut. Remove pressure from the span arm by pushing it away from the cam. Remove the cam. Cam Installation: 1.
  • Page 5 1. For 3-15 or 3-9 psi range, loosen by hand the zero adjustment locking knob and adjust the zero adjustment knob until the valve begins to stroke with more than 3 psi signal (for 9-15 psi range adjust to 9 psi). 2.
  • Page 6 1. If output pressure level is low, before adjusting, check for leaks in tubing connections between positioner and actuator and check supply pressure. 2. Make certain there is no process force or pressure in the valve (The valve should be removed or isolated from the process.) 3.
  • Page 7 1. Before adjusting the gain, place controller on manual and isolate the valve from the process. 2. Turn off supply air to control valve actuator. Using a 5/64-inch allen wrench, loosen both upper and lower lock screws about one half turn. Do not loosen the spacer nut.
  • Page 8 Figure 7: KM82 Circuit Board Module (housing cover removed) NOTE: The zero and span adjustments are multi-turn potentiometers (pots) that have no stops on the ends of their travel; however, they have a slip clutch to prevent damage from over-adjustment. The pots also make a clicking noise when they have reached adjustment limits.
  • Page 9 3. Connect an adjustable current source to the terminal block on the circuit board. Apply the desired input signal to the positioner at which the output pressure is to fall to approximately 1.7 psi This signal can range from factory setting of 3.7 to 8 mA.
  • Page 10 Remove diaphragm retaining plate (15) from relay diaphragm assembly (13) and relay plate (14) Replace relay diaphragm assembly (13) with one from the positioner repair kit. Place the relay plate (14) between the new diaphragms making sure the 1/16-inch diameter holes between the relay plate (14) and the diaphragm line up. Position diaphragm retaining plate (15) on relay diaphragm assembly with rounded inner diameter edge against diaphragm.
  • Page 11 Troubleshooting APEX 8000 Positioners Failure Probable Cause Corrective Action 1. Tubing to wrong ports 1. Re-tube to correct ports (see “installation section). 2. Cam action reversed 2. Refer to “installation” section and reverse cam 3. Feedback lever arm is stuck 3.
  • Page 14 Flowserve Corporation has established industry leadership in the design and manufacture of its products. When properly selected, this Flowserve product is designed to perform its intended function safely during its useful life. However, the purchaser or user of Flowserve products should be aware that Flowserve products might be used in numerous applications under a wide variety of industrial service conditions.

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