3. Ball Valve
This valve has a precision ball seated between two circular seals or seats.
A 90° turn of the handle will change the operation from fully open to fully closed.
- may be used for throttling duty
- generally used with smaller pipe diameters (up to 75mm)
4. Butterfly Valve
This valve has a cylindrical body with an internal rotatable disc serving as the fluid flow
regulating device. This disc's axis of rotation is the valve stem and it is pependicular to
the flow direction. A 90° turn will change the operation from fully open to fully closed.
- has low pressure drops
- fast operation of valve
- may be used for throttling duty
Section 3 Page 43
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