Spirax Sarco PN 3000 Series, Инструкция по установке и обслуживанию

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3.561.5275.201 9
Fig. 3
A = 71 mm for DN 15 to DN 50 Valves
91 mm for DN 65 to DN 100 Valves
If the actuator/valve has been supplied with a positioner reference should be made to the
separate Installation and Maintenance Instructions for this product.
4.1 Adjusting Spring
The actuator spring range and lift off pressure will be indicated on the nameplate. Should it be
necessary to check or adjust the lift off pressure the procedure is descibed in paragraphs 4.2
and 4.3.
4.2 PN3000 Spring Extend Actuators
Note: Adjustment of the spring will only alter the pressure of the control signal air at which the
valve commences to move off its seat (set point) and will not alter the spring pressure range
require to move the valve through its full travel i.e. 0.2 to 1.0 bar spring (range 0.8 bar) set to
commence to lift at 0.4 bar will require a 1.2 bar air pressure (0.4 + 0.8) to obtain valve full travel.
To adjust set point refer to fig. 2 and proceed as follows:
Ensure the control valve has been isolated and the actuator housing is pressure free.
Loosen and remove connector nuts and screws (21) and remove connectors (20).
Using two spanners whilst holding actuator spindle loosen actuator adaptor lock nut (18).
Apply the control signal pressure required to commence lifting the actuator spindle.
With the valve plug remaining on its seat adjust the actuator spindle adaptor until it presses
tightly against the valve spindle. Finger tighten lock nut (18). See Fig. 4 for correct installation.
Release the control air signal. Fit the connectors across the adaptors (17) and (19). Fit connectors
locking screws and nuts and tighten to 2 Nm.
Recheck that the valve just commences to move off its seat at the right spring range minimum
pressure and is fully open at the spring range maximum pressure. Finally bring the spindle at mid
travel and tighten lock nut (18) to the right torque.
After the test check the position of the travel indicator against the "arrow" of the connector and
adjust its position accordingly.
Important
To prevent damage to the valve seat, please ensure the plug does not turn while pressing on the
seat during assembling or adjustment.
To prevent damage to the diaphragm ensure the actuator spindle is not allowed to
rotate when the diaphragm is assembled within its housing.
4. Commissioning
A
Mid travel
Mounting nut