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5
Installation
The valve must be installed and commissioned by qualified staff - personnel who are familiar with the
installation, commissioning and operation of this product and possess the relevant qualifications in their field
of activity.
5.1
Fluoropolymer-lined Atomac valves
Fluorocarbon resin lined valves cannot be treated in the same way as unlined steel valves. The lining material
is softer and more sensitive than metal and is subject to cold flow. If only one tiny spot of the lining materials
is damaged, this could result in leakage or damage to the metal body by the medium. It is essential for all
Atomac valves that before start-up of a new plant the piping system is being flushed in order to remove
possible solids such as welding beads, sand, etc. The Atomac valves must be 100% open during the flushing
process to avoid impurities which could cause damages when the valve is operated.
The lining material moves under temperature and pressure, in that it expands and shrinks. This means that
in practical applications all data given for lined valves must be seen in relation to certain conditions of
temperature and pressure.
For the handling of Atomac valves, we are giving you the following guidelines:
1. Lined
valves have soft sealing faces. Therefore, the flange protection caps intended, or transport and
storage must not be removed until immediately before installation. Should it prove necessary to remove
the protection caps
upon completion of the inspection.
2. If the flange protection caps are removed, fittings must never be placed so as to rest on the soft sealing
faces. If this cannot be avoided, care must be taken to keep the workbench clean and free of metal
chip, sand or other solid particles.
3. No additional gaskets are required for the installation of Atomac lined valves.
4. For maintenance work on an Atomac valve installed in a pipeline, the works safety requirements and
the general accident prevention instructions are to be observed. Look for contact between stem,
grounding spring and gland follower.
5. 2 - 5 hours after the installation has reached its final operating temperature, flange bolts must be
retightened in accordance with the corresponding torque values (see standard valve chart of the
respective valve). Should any leakage occur, it is recommended to check by means of a torque wrench
that the tension bolts have been tightened evenly. If this is the case, the nut of the tension bolt which
is closest to the area where leakage is occurring must be tightened with a 45-degree turn. The 45-
degree turns may then be repeated until the valve leak is eliminated. However, where, valves are
concerned, the valve must be operated after every 90-degree turn of the nut to make sure that the
valves can be opened and closed without problems. If leakage has been eliminated by this method,
then all remaining bolts on the same side of the fitting must be tightened by means of a torque wrench.
Finally, the valve must be operated to check its performance.
6. After lengthy operation period, leakage may occur in the stem area due to normal wear and tear of the
material. In such a case, the adjusting nuts above the gland follower must be tightened evenly with
short turns until leakage stops. An uneven tightening of the packing gland follower can result in a tilting
of the same. Every time that the packing gland follower has been re-adjusted, a test must be carried
out to establish that the valve still opens and closes smoothly.
for inspection purposes, care must be taken to re-fit them into their original position
Excessive tightening of the adjusting nuts might damage the stem lining.
The packing gland follower must only be adjusted to such a degree as
is required for the elimination of the leak.
Page 17 of 39
AKH3.2 User Instruction – FCD ATENIM0001 EN
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