The
rising stem and the non rising stem gate valve are the two different
types of valves commonly used in most of the places today. The rising
stem valve is identified by a threaded shaft which is rotated by a
handle fixed in the centre. The stem or the shaft rises when the handle
is rotated. It rises when the valve is opened and descends when the
valve is closed. So it is easy to identify the position of the valve by
length of shaft above.
The other variety of valve includes the
non rising stem valve which is used in places where there is space
constraint. It is mostly used in underground pipes. Rotating the handles
to the left opens the valves fully whereas rotating it to the right
closes the valves completely. The stem of the valve does not rise while
opening and closing the valve.
Another advantage of using these
valves includes the use of a single padlock to open and close the valve
whereas in the rising stem valve, two padlocks are necessary. Gate valve
is available in different varieties in many of the leading online
stores.

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