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All Valve types: Flange bolts of right length are necessary:
• Too long bolts could deform the valve body and result in leakage in the flange.
• Too short bolts could deform the threaded holes in the valve body at installation.
Choose bolts with the correct thread and length according to the flange drilling information in the data
sheet.
3. Tighten the bolts first manually and then evenly and crosswise, for a uniform load of the gasket, with a torque as
required by the gasket manufacturer. Valve type SLV, SLF, SLH and SLX shall be assembled with the mating
surfaces of the valve body and the pipe flanges up to metal/metal contact. See fig. 6.
Valid for SLV, SLF, SLH and SLX valves only
Make sure that the flange is centered and is covering the metal frame around the seat.
Tighten flange bolts crosswise to eliminate any gap between body and flange.
To ensure the seats will stay in correct position after every valve manoeuvring, we
recommend using load distribution rings (LDR) on the SLV, SLF, SLH and SLX valves
when:
•
The pipelines are rubber lined and/or the flanges are partly or entirely rubber
covered.
•
The inner diameter of the connecting pipes and/or flanges is larger than the
inlet diameter of the valve.
The outside diameter of the raised flange is not large enough to cover the
•
metal frame around the seat in order to accomplish metal to metal contact
between the valve and flange.
If load distribution rings are ordered they are as standard assembled on the valve upon delivery.
4. To finish the installation, make an operational test by opening /closing the valve. Observe the actuator (if any)
instructions.
• A valve with handwheel should be operated with normal hand force. Exceptional force used to close the valve
can damage it.
• A valve with electric/pneumatic actuator shall be operated by the plant control signals into its end positions,
i.e. OPENED and CLOSED.
• At connection of an actuator to the plant control system the actuator instructions shall be followed.
Fig. 6
Fig. 7
Document: is-VALVE, 22-10-01 issue: 16
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