Spirax Sarco APT10-2, Installation And Maintenance Instructions Manual, Page: 20 / 32

IM-P612-18 ST Issue 3
20
7.3 Replacement of spring and actuator arm
Please ensure the safety recommendations are observed before commencing with
any maintenance of this product.
Tools required
19 mm A / F socket, Flat blade screw driver, Torque wrench, Long nose pliers
To replace the spring and actuator arm
1. Remove the cover and old gasket (see cover gasket replacement procedure, Section 7.1).
2. Lift the cover assembly to a bench or other convenient working surface and clamp securely,
avoiding contact with the gasket face.
3. Ensure the float is at the bottom of its travel.
4. Remove the split pin and washer, from the spring retaining shaft (Y). (See Fig. 18).
5. Remove the shaft and allow the spring to drop free.
6. Draw the actuator arm downwards within its slots until the whole spring and actuator arm
assembly with the exhaust valve comes free. It may be necessary to slide the exhaust valve
(item 18) backwards against its internal spring to free it from the pump bracket guide (item 13).
7. Align the slot in the exhaust valve with the tang of the actuator arm.
8. Gently rotate the exhaust valve away from the tanged spigot of the actuator arm (item 24,
shown in Fig. 18) being careful not to damage or lose the small exhaust valve compression spring.
9. The spring and actuator arm can both be replaced.
Note: There is no need to remove the spring from the actuator arm, as both these items
are supplied fully assembled in the spares kit (See Fig. 19).
10. Fitting the new spring and actuator arm is the opposite to removal. Remember to
compress the small spring within the exhaust valve (item 18) before refitting to the tanged
spigot of the new actuator arm.
11. Ensure the actuator is correctly aligned and located within the slots of the pump bracket (item 13).
12. Once this is correctly located, ensure the exhaust valve can slide easily within its guides.
13. Always use new split pins and washers when refitting the spring retaining shaft (Y).
14. With the mechanism fully assembled, reposition the cover assembly with the body, ensuring
the gasket faces are carefully aligned and no parts of the gasket are trapped or pinched outside
the sealing areas.
15. Refit the cover bolts ensuring they are sequentially tightened in opposing pairs,
gradually increasing torque to 63 ± 5 N m (46.5 ± 4 lbf ft).
16. Carefully reconnect the motive steam supply and the exhaust lines to the connections
marked (S) and (E) and the condensate inlet and outlet to the connections marked (IN)
and (OUT). The APT10-2 is now ready to recommission.