PLUG VALVES
The plug valve is one of the simplest types of valve. It is also
known as a petcock or a plug cock. Like the gate valve it is only
used in the fully open or fully closed position. The plug is
a tapered round plug. It has a rectangular hole in the centre
that lines up with the ports in the valve body.
The valve has a handle for manual operation. It is opened or closed
by a quarter turn of the valve handle. When the valve handle is
pointing in the direction of the pipe the valve is in the fully
open position. When the valve handle is pointing across the pipe
the valve is in the fully closed position.
A special grease is forced into and around the plug to act as a
seal and a lubricant. These valves are a simple design.
They do not take up much space and do not have high yokes, bonnets
or valve stems. Normally these valves are manually operated but
they can be operated automatically if required.
The plug valve is one of the simplest types of valve. It is also
known as a petcock or a plug cock. Like the gate valve it is only
used in the fully open or fully closed position. The plug is
a tapered round plug. It has a rectangular hole in the centre
that lines up with the ports in the valve body.
The valve has a handle for manual operation. It is opened or closed
by a quarter turn of the valve handle. When the valve handle is
pointing in the direction of the pipe the valve is in the fully
open position. When the valve handle is pointing across the pipe
the valve is in the fully closed position.
A special grease is forced into and around the plug to act as a
seal and a lubricant. These valves are a simple design.
They do not take up much space and do not have high yokes, bonnets
or valve stems. Normally these valves are manually operated but
they can be operated automatically if required.