Flowserve F519 Flanged ANSI - Manual (Page 5)

5 INSTALLATION INSTRUCTIONS
a) Standard valves may be installed in either direction. Valves with a upstream relief hole (Q190) are
unidirectional and must be fitted with the flow arrow pointing downstream.
b) Installation of flanged valves should follow prevailing site standards. Where such standards do not
exist the following should be used as a guideline.
i) Flanged joints require compressive loading onto the gasket material as the normal line pressure
forces tend to separate the joint. There should be no misalignment between the valve and mating
faces.
ii) Pipework should have the correct gap to allow for the valve face to face length plus assembled
gasket material thickness.
iii) Ensure the pipeline and flange faces are clean and free of any debris which may be detrimental to
flange sealing.
iv) Bolting should be of the correct size, length and material for the duty.
v) Locate the valve between the pipe ends and slide in the gaskets. It may be necessary to lever the
mating flanges gently apart to allow for easy fitting of the gasket. Care should be taken to prevent
damage to the sealing surfaces. Correct lifting equipment must be used when handling valves for
operator safety.
vi) Assemble all bolts and loosely tighten. Diametrically and evenly tighten the bolts to the correct
torque required for the specific gasket material.
c) It is recommended that the valves are left in the open position during fitting.