Page 25 of 52
17. Reinstall the bottom valve adaptor and drain plug and then
partially fill the housing with the appropriate liquid.
18. Remove the rubber band.
19. Unfold the top flange and center both the top and bottom of
the HYDRAtube (Figure 31)
20. Reassemble the top and bottom adaptor parts, torque the
tie bar bolts to the recommended value.
21. If the HYDRAtube housing has been removed from the
pump head and the hydraulic prime lost, follow the flat
diaphragm re-priming procedure before re-priming the
intermediate/housing chamber.
Figure 31
The following steps apply to PFA HYDRATUBES
22. Pick up the edge of the HYDRAtube flange and bend it upwards so that it is even with the
body of the tube. Avoid creasing the tube material.
23. While keeping the flange bent up, lift and remove the HYDRAtube adaptor and any gaskets
beneath it.
24. Pull the HYDRAtube out from the bottom by a combination of twisting and bending. Also
remove any gaskets which were beneath the bottom
tube adaptor.
25. Inspect the tube for any damage (i.e. cuts, cracks,
chemical attack). Replace if necessary.
26. When installing a tube do not use tools which may
cut or damage the tube
27. Obtain a rubber band.
28. Place one flat gaskets in the top recess of the
HYDRAtube housing.
29. Check the bottom HYDRAtube adaptor, it should
have one flat gasket on it. Carefully straighten the
flange on one end of the tube and work it through the
adaptor and gasket. Slide the adaptor and gasket to
the opposite end of the HYDRAtube.
Figure 32a
30. Now tightly wrap the straightened end of the HYDRAtube with a rubber band. (Figure 32a)
31. Work the wrapped end of the HYDRAtube up through
the bottom hole of the housing, rotating gently to work
the HYDRAtube upward to the top of the housing.
32. With a slight push at the bottom flange of the tube, guide
the nose of the HYDRAtube to the center and out the top
hole in the housing.
33. Work the top tube adaptor over the top end of the tube.
It may be necessary to remove the rubber band first.
Figure 32b
34. Unfold the top flange and center both the top and bottom of the HYDRAtube. Make certain
the HYDRAtube flanges are seated in the HYDRAtube adaptors.
35. Reassemble the top and bottom adaptor parts, torqueing the tie bar bolts to the
recommended value.
36. If the HYDRAtube housing has been removed from the pump and the hydraulic prime lost,
follow the flat diaphragm re-priming procedure before re-priming the intermediate/housing
chamber.
