A:

(1) The valve flanged threaded connection should be carried out in a closed state.

(2) valve and pipe welding TIG welding use backing to ensure its smooth and clean interior. When welding, the valve should be in the open state, to prevent local overheating deformation. When welding high-pressure injection valve should open the valve, the rubber gasket singled to prevent Aprons were burned.

(3) prior to installing the valve, according to the media flow direction, to determine its mounting direction.

Valve (4) mounted on a horizontal pipe upward to vertical, horizontal upward or downward 45 °, its center line to try aligner.

(5) When installing cast iron valves (black, silver) shall prevent a strong connection or uneven force caused damage.