Flowserve 4 Series Kämmer Pneumatic and Electropneumatic Actuators - Manual (Page 13)

13
Flow Control Division
Kammer Control Valves
6 GENERAL SERVICE INFORMATION
Service to the actuator is best performed when the actuator is removed from the valve body.
For the purpose of these instructions, consider the actuator as a separate subassembly with the procedures
described in these instructions being performed on a bench. However, many service repairs and adjustments
can be accomplished in the field while the actuator and valve body are still connected to each other.
6.2.1 Valve/actuator without coupling
6.2.1.1 Place the actuator assembly onto the valve body
subassembly. At the same time, install the clamping nut,
packing gland nut, plug stem locknuts, and the travel indi-
cator disc.
6.2.1.2 "Air-to-open/fail-to-close" actuators only:
Rotate the actuator assembly clockwise, threading the ac-
tuator stem onto the plug stem until the yoke plate just
makes contact with the bonnet flange, and the actuator is
properly aligned for installation.
NOTE: Ensure that the plug assembly is not rotated with the
plug seated. This may cause irreparable damage to the
seating faces.
"Air-to-close/fail-to-open" actuators only:
Lift the plug stem to the actuator stem. Thread the plug stem
into the actuator stem so that the distance "plug in seat", to
"plug raised", is approximately the distance of the specified
stroke.
6.2.1.3 Tighten the clamping nut and the packing gland nut (see
valve service instructions for torque values).
6.2.1.4 Adjust the valve plug for seat off by threading the plug stem
further into or out of the actuator stem.
NOTE: rotate the plug stem while the valve is in the closed
position. Open the valve first, make the adjustment while the
valve is open, and then close the valve to check for seat-off.
6.2.1.5 After final adjustments are made, lock the two stem nuts
against the actuator stem and set the position of the travel
indicator on the yoke rod.
6.2.2 Valve/actuator with coupling
6.2.2.1 Place actuator onto valve.
6.2.2.2 Screw on and tighten yoke rod nuts.
6.2.2.3 Fit the coupling screws finger tight.
6.2.2.4 Adjust the valve plug for seat off by threading the plug stem
further into or out of the coupling insert.
NOTE: rotate the plug stem while the valve is in the closed
position. Open the valve first, make the adjustment while the
valve is open, and then close the valve to check for seat-off
6.2.2.5 After final adjustment tighten the coupling screws and set
the position of the travel indicator on the yoke rod.
6.1 REMOVING ACTUATOR FROM VALVE BODY
DANGER: Depressurise the line to atmospheric pressure
and drain all fluids from the valve before working on the
actuator. Failure to do so can cause serious injury.
For air-to-open actuators start with 6.1.1
For air-to-close actuators start with 6.1.2.1
6.1.1 Remove the valve cap and nameplate. Turn the zero adjust-
ment locknut until it just makes contact with the actuator
spring case (this removes the spring force from the valve
plug).
6.1.2 Valve/actuator without coupling
6.1.2.1 With a wrench, hold the actuator stem to prevent it from
rotating while using a second wrench to loosen the plug
stem locknuts.
NOTE: If the actuator stem is rotated the diaphragm will be
twisted and this may cause irreparable damage.
6.1.2.2 Loosen the packing gland nut and the actuator clamp nut.
6.1.2.3 Being sure not to turn the plug stem, rotate the actuator
assembly counterclockwise to disengage the actuator stem
from the valve plug stem.
NOTE: Ensure that the plug assembly is not rotated with the
plug seated. This may cause irreparable damage to the
seating faces.
6.1.2.4 Lift the actuator assembly from the valve body subassembly.
At the same time, remove the plug stem locknuts, the travel
indicator disc, packing gland nut, and clamping nut.
6.1.3 Valve/actuator with coupling
6.1.3.1 With a wrench, hold the actuator stem to prevent it from
rotating while using a second wrench to loosen and remove
coupling screws.
6.1.3.2 Remove the yoke rod nuts and lift actuator a s s e m b l y
from the valve.
6.2 CONNECTING ACTUATOR TO VALVE BODY
General Notes:
• The actuator must be calibrated before connecting it to the
valve body. See section 3 "Calibration" of these instructions.
• All worn or damaged parts must be replaced. All parts to be
reused should be cleaned for ease of reassembly.