Spirax Sarco PN 3000 Series, Инструкция по установке и обслуживанию

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The PN3000 and PN4000 series pneumatic actuators are maintenance free. To ensure satisfactory
operation it is strongly recommended that the control signal air is filtered and supplied free of oil and
water. Should it be necessary to replace spare parts the following procedure should be used.
5.1 Removing Actuator from Valve
Drive actuator into approximately mid-travel position with the air supply. Loosen and remove
connectors nuts and screws (21) and remove connectors (20).
Loosen and remove yoke monting nut and lift actuator off the valve.
Reduce air supply pressure until housing is pressure free. Disconnect air supply from the actuator.
5.2 PN3000 Series
5.2.1 Diaphragm Kit - How to Fit
Remove actuator from valve as described in Section 5.1. Loosen and remove housing screws
(16) and remove housing lid (1).
Note 1 - On certain spring ranges 3 off longer hosing bolts are fitted (16). These should be
removed after all other bolts are removed and should be loosened evenly to prevent distortion.
Using two spanners whilst holding actuator spindle (5), loosen plate locknut (6). Remove springs
(4), spacer (7), "O" ring (8), diaphragm plate (3) and diaphragm (2).
Refit new diaphragm and "O" ring reassembling all items in reverse order. Using two spanners,
whilst holding actuator spindle tighten plate lock nut. Refer to Table 1 for torque rating.
Refit top housing and securing nuts and bolts.
2 - While supporting the actuator spindle so that the diaphragm sits evenly in the lower housing,
tighten evenly housing securing bolts to avoid distortion. On some spring ranges 3 off longer
housing bolts are provided to cater for the longer spring. If supplied, these should be psitioned
120° apart and tightened evenly prior to fitting the remaining bolts.
3 - To avoid distortion of the diaphragm do not fully tighten housing bolts until all bolts have been
fitted. Final tightening should then be carried out evenly. Refer to Table 2 for torque rating.
5.2.2 Spring Kit - How to Fit
Remove actuator from valve as described in Section 5.1. Loosen and remove housing screws
(16) and remove housing lid (1) as described in Section 5.2.1. Remove springs.
Replace new springs; While supporting the actuator spindle so that the diaphragm sits evenly in
the lower housing, refit top housing and tighten bolts evenly.
Refer to Section 5.2.1. Note 2 and 3.
5. Maintenance
Table 2: Recommended tightening torques
Actuator
Housing Bolts (16) Lock Nut (6)
Series
Size Torque Nm Size Torque Nm
PN3200/4200 M6 5 +/- 0.5 M12 40 +/- 3
PN3300/4300 to PN3600/4600 M10 15 +/- 2 M12 40 +/- 3
Fig. 5