The gate valve is normally used
for on-off service. It is not recommended for throttling.
The gate valve is normally
installed to pipe horizontally and the valve stem stands
vertically. It can also be mounted to the vertical direction with
the stem facing to the opposite or other directions except the
vertical, provided that a special construction is prepared
depending on the valve size, service conditions, or materials. In
case of valve purchase for a special purpose other than the normal
installation, the orientation of valve should be specified.
After the gate valve is closed
completely with a sufficient force enough to shut off, the stem
should be backed slightly about 1/8 to 1/4 turn to relieve the
load on stem. This will cause the stem to expand a little without
valve bending or damage, not affecting the valve shutoff.
