Valves control, isolate and protect fluid systems throughout industrial plants. Selecting and maintaining them correctly is essential for process stability and safety.
Common Valve Types
- Gate valves: used for on/off isolation with minimal pressure drop when fully open.
- Globe valves: suited to throttling and flow regulation.
- Ball valves: quarter-turn valves offering tight shutoff and fast operation.
- Butterfly valves: compact and economical for larger pipe sizes.
- Check valves: prevent reverse flow automatically.
- Safety relief valves: protect equipment from overpressure.
Selection Factors
Consider fluid type, pressure, temperature, required flow control, shutoff tightness, actuation method and compatibility of body, trim and seal materials. Standards such as ASME and API provide guidance on design, testing and pressure classes.
Piping Considerations
Proper pipe sizing balances velocity, pressure drop and cost. Supports and expansion loops accommodate thermal movement and prevent stress on equipment connections. Avoid sudden valve closure in long lines to reduce the risk of water hammer.
Inspection and Maintenance
Inspect packing and gaskets for leaks, exercise critical valves regularly so they do not seize, and test safety relief valves at scheduled intervals. Monitor pipe wall thickness in corrosive or erosive services. Keep clear records of inspections, repairs and changes to support safe operation and regulatory compliance.