1, Checking Valve Body
Check sizes and material :
Sizes & Specifications of Trim Materials are indicated
on package and valve, and re-confirmation of sizes/
specifications before its installation to pipings is
recommended.
Check piping sizes :
Check the valve sizes fit the piping sizes. (Fig.5)
Check the number and the sizes of bolts :
Before using bolts and nuts, apply a seizure preventive
to bolts and nuts.
2, Welding Before Installation To Pipings
Cares when welding flanges :
Installation of the valve immediately after welding of
the flange to be avoided, and installation to be made
only after welded-part cooled down.
Welding of flange or reparing works through welding,
while keeping the valve installed to pipings, to be
avoided. (Fig.6)
Make sure welding work is completely done before
installation the valve to the piping. Flanges to check
and confirm on deflection or miscenter-alignment of
flange and no spatter sticked.
3, Check Piping Flanges
Make sure no deflection or damage to piping :
Make sure no deflection or miscenter-alignment of
flanges and no score or spatter stacked. Clean spatter
stacked on the edge of the flanges completely in order
not to damage the seat-ring.
Cleaning :
Flange surface is to be air-purged for cleaning. If
rust or foreign matter is sticking on the surface of the
flanges, wash the surface of the flanges in detergent.
After washing, make sure no detergent remains on the
seat-ring. If detergent remains on the seat-ring, it will
damage the seat-ring.
Make sure that no oil or detergent sticks to EPDM seat.
Fig.5
Fig.6
5
