Key Function:Quick shut-off, sometimes used for flow diversion.

Operation:A tapered or cylindrical plug with a port rotates 90 degrees (quarter-turn. Sealing surfaces are often lubricated.

Typical Applications:Oil, gas, and services with slurries or suspended solids.

Key Function: Used for isolation and some throttling. It's compact and lightweight.

Operation: A disc rotates 90 degrees (quarter-turn) around its stem to control flow.

Typical Applications: Water treatment, HVAC, large-diameter low-pressure pipelines.

Key Function: Prevents backflowof media. It isself-actuating(automatic).

Operation:The disc opens with forward flow pressure and closes by gravity or backflow. Common types: Swing, Lift, and Wafer (Dual-Plate).

Typical Applications:Pump or compressor discharge to protect equipment from reverse flow.

Key Function: Primarily used for flow regulation (throttling) and reliable shut-off. Offers better throttling capability than gate or ball valves.

Operation: A disc (or plug) moves up and down perpendicular to the seat, changing the flow area and creating significant pressure drop. It's a multi-turn valve.

Typical Applications: Steam, feedwater, chemical processes where flow control is needed.

Key Function:Used forfull ON or full OFFservice,not for throttling. It provides astraight-through flowwithminimal pressure dropwhen fully open.

Operation:A gate (wedge or parallel) is raised or lowered. It's amulti-turnvalve.

Typical Applications:Crude oil, natural gas, water pipelines where full bore and low pressure drop are required.

Key Function:Quick shut-off and isolation. Known for excellent sealingand fast operation.

Operation: A hollow ball rotates 90 degrees (quarter-turn) to open or block the flow. Available in full bore and reduced bore.

Typical Applications: Oil, chemical, LPG services requiring frequent and tight shut-off.