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Emerson Yarway Installation, Operation And Maintenance Instructions

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YARWAY MODEL 20 PNEUMATIC DIAPHRAGM ACTUATOR
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
Before installation these instructions must be fully read and understood
UNPACKING
The Yarway pneumatic diaphragm actuators
are mostly delivered in combination with
Desuperheaters for use on low-, medium- and
high pressure steam applications and packed
with the greatest care in wooden boxes or
cartons for protection during handling and
transit to site. If it is found, however, that
damage has occurred during shipment, then
this should be reported immediately to your
forwarder or Yarway representative.
Particular care should be taking when
removing the pneumatic diaphragm actuators
(including Desuperheaters) from the packing
and your special attention is required to
check carefully that no damage has occurred
to the actuators, accessories as: pneumatic
positioner, electric/pneumatic positioner,
position transmitter, air filter regulator, booster
relay, lock-in relay, limit switches, solenoid
valves and the standard piping with stainless
steel pipe and fittings.
Warning: the hoisting lug is for the actuator
only, NOT for a total assembly!
www.valves.emerson.com
PRINCIPLE OF OPERATION
In a direct acting diaphragm actuator,
increasing loading pressure moves the actuator
stem downward, compressing the spring. When
the loading pressure is decreased, the spring
moves the actuator stem upward.
In the event of failure of the loading pressure
or the operating medium pressure to the
controller, the actuator stem moves to the
upward position.
Warning: be certain that the diaphragm casing
pressure does not exceed the limits listed in
the specification table (see table 1).
© 2017 Emerson. All rights reserved.
VCIOM-03327-EN 16/10

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  • Page 1 YARWAY MODEL 20 PNEUMATIC DIAPHRAGM ACTUATOR INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS Before installation these instructions must be fully read and understood PRINCIPLE OF OPERATION In a direct acting diaphragm actuator, increasing loading pressure moves the actuator stem downward, compressing the spring. When the loading pressure is decreased, the spring moves the actuator stem upward.
  • Page 2 YARWAY MODEL 20 PNEUMATIC DIAPHRAGM ACTUATOR INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS FIGURE 1 FIGURE 2 FIGURE 3 FIGURE 4 20 - 55 20 - 55 20 - 90 20 - 90 TABLE 1 - FUNCTIONAL SPECIFICATIONS Type 20 - 55 (see fig. 1) 20 - 90 (see fig.
  • Page 3 YARWAY MODEL 20 PNEUMATIC DIAPHRAGM ACTUATOR INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS FIGURE 5 Air filter regulator E/P-postioner Water inlet Water outlet Assembly of a ‘Yarway’ standard duty A.T.-Temp Desuperheater...
  • Page 4 YARWAY MODEL 20 PNEUMATIC DIAPHRAGM ACTUATOR INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS ACTUATOR/DESUPERHEATER DISASSEMBLY Diaphragm exchange (SEE FIG. 6 AND 7) • Cut-off the air supply to the positioner via the air filter regulator. Disconnect the pneumatic Before any maintenance operation on the...
  • Page 5 NOTES - Dimensions may be subject to change without prior notification. - Yarway will provide a certified dimensional drawing upon request. - Bolts nr. 19 are used for disassembly of actuator and provided with protection tube. * Zinc plated parts + Optional •...
  • Page 6 NOTES - Dimensions may be subject to change without prior notification. - Yarway will provide a certified dimensional drawing upon request. - Bolts nr. 19 are used for disassembly of actuator and provided with protection tube. * Zinc plated parts + Optional •...
  • Page 7 YARWAY MODEL 20 PNEUMATIC DIAPHRAGM ACTUATOR INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS FIGURE 8 - SIDE-MOUNTED HANDWHEEL • • • • • • • • • • • • • • • • • • • • • • • •...
  • Page 8: Maintenance

    Care should be taken during any maintenance actuator should be reported immediately to operation, particularly when working with Yarway or their local agent. Any damage to grinders, compressed air and rotating the packing container should be rectified to machinery. It is imperative that safety...

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