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WCB_D4_D4SL_sch5_US.indd
D4 / D4 SL Schedule 5 Series
Double Seat Mix Proof Valves
Instruction Manual: US - rev. 1
Waukesha Cherry-Burrell
®
brand D4 / D4 SL Schedule 5 Valves
7. Installation and Commissioning
- The valve must be installed in vertical position to ensure that fluids can
drain off freely from the valve housing and the leakage chamber.
Caution!
Leakages and fluid losses from seat lifting and CIP-
spraying must be safely collected and drained!
- The valve housing can be welded directly into the pipeline (completely
removable valve insert).
Note!
Observe welding instructions.
- Observe heights of installation and removal!
Caution!
Before first startup:
- Actuate the valve by applying compressed air. The opening, closing
and shaft lifting processes must run smoothly.
- Check the function of the control unit or valve position indication.
- Check for possible leakages during commissioning. Replace defective
seals.
7.1.
Welding Instructions
- Before welding the valve, remove the valve insert from the housing.
Caution!
Handle and store the valve insert carefully to avoid damaging
the parts.
2-4" valves:
Remove the lower shaft seal and guide ring from the
housing.
6" valve:
It is not necessary to remove the lower shaft seal as it
can be damaged during removal.
-
Welding should only be carried out by certified welders (DIN EN ISO
9606-1) (seam quality DIN EN ISO 5817).
- The welding of the valve housings must be undertaken in such a way
that the valve body is not deformed.
- The preparation of the weld seam up to 0.12" (3 mm) thickness must be
carried out as a square butt joint without air. Consider shrinkage!
- TIG orbital welding is recommended.
-
Caution!
After welding the valve housing or mating flanges, and after
performing any work on the piping, do not operate the valves until the
corresponding areas of the installation and piping have been cleaned
and welding residue has been removed. If the piping is not cleaned
before operation, welding residue and dirt particles can settle in the
valves and cause damage to the valves and seals.
- If these welding instructions are not followed, any resulting damage will
not be covered by the warranty.
- Welding directives for aseptic applications shall be drawn from the
AWS/ANSI Directives and EHEDG Guidelines.
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