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4. Installation
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4.7.
CHECKING AND REVIEW
Perform the following checks before using:
Check that the clamps and nuts are well secured.
Open and close the valve (applying compressed air to the actuator) several times to make sure it
operates correctly and to make sure that the shaft joint is coupled smoothly to the valve housing.
4.8.
WELDING
Welding work should only be done by qualified persons who are trained and equipped with
the necessary equipment to perform this kind of work.
Before starting welding, disassemble the valve as explained in section 7.4. Assembly and disassembly.
4.8.1.
Single seat relief valve, weld/weld
Disassemble the valves as indicated in section 7.4. Assembly and disassembly.
Weld the valve housing to the pipes.
When welding the valve housing, it is very important to keep the minimum distance (height A) to
allow the valve to be disassembled for subsequent reviews and to change valve parts (seals,
bushings, etc.)
Valve size
A [mm]
DN25/OD1”
370
DN40/OD1½”
380
DN50/OD2”
430
DN65/OD2½”
480
DN80/OD3”
500
DN100/OD4”
540
