Generally, valves can be categorised as manual or automatic valves.
Manual Valves
The following are the types of manual valves commonly used in hydronic systems:
1. Globe Valve
Flow is controlled by a circular disc forced against or withdrawn from an annular
ring, or seat, that surrounds an opening through which flow occurs.
The movement of the disc is parallel to the flow direction.
- used for pipe diameters up to 300mm
- used for throttling duty where positive shutoff is required
2. Gate Valve
Flow is controlled by means of a wedge disc fitting against seating faces.
Gate movement is pependicular to the flow direction.
- has straight-through openings as large as the full bore of the pipe.
- this type of valves are intended to be fully open or fully closed
- should not be used to regulate or control flow
- useful for isolation/shut-off purposes.
Section 3 Page 42
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