GEA D-tec D, Operating Instruction

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Caution!
Liquids in pipes
Danger of injury due to liquid spraying out
► Therefore, before releasing any pipe connections or hinged clamps: drain
the pipe and, if necessary, clean or rinse it.
► Separate the pipe section in which the valve is to be fitted from the rest
of the piping system to prevent product entering again.
Carry out the following steps:
1. Fit valves with detachable pipe connection elements – using suitable
connection fittings – directly into the pipe system.
®
Valve is installed.
6.5 Valve with welded ends
This section describes the welding procedure for the valve housing.
Warning!
Spring tension in the valve
Danger of injury when opening the clamp connections on the actuator or on
the housing as the released spring pretension will suddenly lift the actuator.
► Therefore, release the spring tension before detaching the clamp
connections by pressurising the actuator with compressed air at max. 8 bar.
Notice
Welding distortions
An open housing can warp during welding.
► To avoid welding distortions, always seal the housing before welding.
Carry out the following steps:
1. Release the spring tension.
2. Remove the valve insert, see Section 10.5.1.2, Page 48 and Section 10.5.3,
Page 56.
3. Weld in the housing free of tension, in addition:
4. Fit the housing into place and tack it.
5.
To avoid welding distortions, always seal the housing before welding.
6. Flush the housing with forming gas from the inside to push the oxygen out of
the system.
7. Weld the housing into the pipe system; use welding filler if necessary. When
technically possible, use the WIG-orbital welding process with pulse
configuration, according to guidelines EHEDG documentation. 35.
8. Passivate the seam after welding.
9. Assemble the valve and vent the actuator.
Assembly and installation
Valve with welded ends
430BAL013307EN_8
30 04.08.2022