A partially open gate valve can cause vibrations and
permanent damage to pipes. The seating part of the valves can also be
damaged by the fluid friction if the valves are partially opened. In
these valves, the design is specifically aimed at completely blocking
the flow or completely allowing the flow of water.
Gate Valve- The Different Types
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.

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