Manually Operated Plug Valve Installation

While installing plug valves, care should be taken to permit room for the operation of the lever, handle, or wrench. A manual operator is commonly longer than the valve and it rotates to a position parallel to the pipe from a position 90° to the pipe.

Plug Valve Glands

The gland of the plug valve is equivalent to the bonnet of a gate or globe valve. A gland secures the stem assembly to the valve body. There are three common categories of glands: screwed gland, single gland, and bolted gland.

For ensure a tight valve, the plug must be seated at all times. A Gland adjustment should be kept tight sufficient to avoid the plug from becoming unseated and exposing the seating surfaces to the live fluid. Concern should be exercised to not overtighten the gland that will result in a metal-to-metal contact among the body and the plug. Like a metal-to-metal contact creates a further force that will need extreme effort to operate the valve.