To 5-Year Maintenance - Hawido 1401 Instruction

Checking the valve
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Remove the optical position indicator or plug on the valve cover.
•
Check that the valve spindle moves easily by raising and lowering it with the threaded rod.
•
Assemble optical position indicator or plug.
Putting back into service
•
according to Commissioning paragraph
Functional check of the valve
Caution: In order to avoid pressure surges in the functional check described below, large flow rates must be
throttled by slowly closing the gate valve in front of the valve.
•
Slowly close the ball valve (2C); the valve must close.
•
Slowly open the ball valve (2C); the valve must open.

2.3 4 to 5-year maintenance

Dirt trap (main line)
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Unscrew the lid
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Clean or replace the filter
•
Install the filter and screw the lid back on
Filter (control line)
•
Unscrew the lid of the filter
•
Clean or replace the filter mesh
•
Re-install the filter and screw the filter lid back on
Base valve (see chapter: Repair kits and spare parts)
•
Loosen the screw connections and remove the complete control line.
•
Dismantle the optical position indicator or assembled accessories and replace the gaskets.
•
Undo the screws of the valve cover and remove the cover.
•
Visually inspect all inner components for wear, dirt and scaling.
•
Clean the inner components, the seat and the inner surfaces, including the cover.
•
Dismantle the spindle guide in the body, flush the body interior.
For valves DN 40 to DN 100 the spindle guide is dismantled from the inside. Here the thread of the
spindle guide and the base valve must be extremely clean. Grease the thread thoroughly (e.g.
Foodgrease Aqua, Art. no. 5292, see chapter "Control line individual parts and accessories").
•
Replace the diaphragm, the O-ring and, if necessary, the seat seal.
•
Grease the spindle guide area with a grease suitable for contact with food (e.g. Foodgrease Aqua).
Check the easy movement of the spindle.
•
Reassemble the base valve (see table in the annex for torques). During the assembly, the easy
movement of the spindle must be checked several times by actuating the threaded rod
Dismantling the control valve (see Chapter 3
•
Undo the screw on the hand wheel
•
Turn the hand wheel to the left until no resistance can be felt from the spring
•
Undo the housing screw
•
Replace the diaphragm, the O-ring and, if necessary, the seal support
•
Visually inspect the inner surfaces of the housing, and clean if necessary, including the cover
•
Assemble the control valve
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