ART 22
Installation
Valves are precision manufactured products and should not be subjected to misuse.
Careless handling, allowing foreign particles to enter the valve through the end ports, lack
of cleaning both valve and system before operation should be avoided. Excessive force
during pipe tightening and handwheel operation should be avoided.
Valves must be provided with adequate support. Adjoining pipework must be supported
to avoid the imposition of pipeline strain onto the valve, which would impair its
performance.
Immediately prior to installation, the adjacent pipework should be checked for
cleanliness and freedom from debris.
Confirm that the pipe threading is correct to avoid excessive penetration of the
pipe into the valve, which may cause damage.
Thread sealing compounds appropriate to the application must be used but excessive
use should be avoided, since this increases thread interference and may cause
overstressing of the body ends and may cause thread seal to extrude into the bore,
disturbing the flow condition.
Ensure the threads are properly engaged before proceeding to tighten the valve
onto the pipe.
The wrench must only be located on the valve end into which the pipe is being
threaded to avoid distortion of the valve.
Fixed orifice double regulating valves should be installed with a minimum of 5 diameters
equivalent of straight pipe upstream and 2 diameters downstream having the same
nominal diameter as the valve and should not include any reducers or any
other intrusions into the bore within these specified lengths.
It is important to ensure that the flow arrow on the valve is coincident with the
direction of flow in the pipeline.
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