Industrial Valve Fundamentals: Isolation vs. Throttling Service
1. Mechanical Classification Valves are the “controllers” of a piping system. To select the right one, you must first define the intent:
- Isolation (On/Off): Designed to be fully open or fully closed.
- Gate Valves: Use a wedge-like disc; ideal for straight-line flow with minimum pressure drop.
- Ball Valves: Quarter-turn operation; provide tight shut-off and rapid action.
- Throttling (Regulation): Designed to regulate flow volume.
- Globe Valves: Excellent for precise flow control, though they cause a higher pressure drop.
- Butterfly Valves: Versatile and lightweight; used for both isolation and moderate throttling.
2. Design Standards DTC valves comply with the most stringent global protocols:
- API 6D: Specifications for pipeline valves.
- API 598: Valve inspection and testing (Pressure/Leakage).
- ASME B16.34: Valves flanged, threaded, and welding end.
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