Sliding-stem control valves are widely used in industrial applications for precise flow regulation. They operate with a **linear motion**, where the valve stem moves up and down to control the flow of fluids.
- **Linear Motion**: The stem moves in a straight line to open or close the valve.
- **Common Types**:
- **Globe Valves**: Most popular for throttling applications.
- **Needle Valves**: Used for fine flow control.
- **Gate Valves**: Primarily for on/off control.
- **Manual (handwheel operation)
- **Pneumatic (air pressure-driven)
- **Electric (motorized control)
- **Materials: Typically made from stainless steel, carbon steel, or brass for durability.
- **Flow Characteristics: Designed for **precise modulation** and minimal leakage.
- **ANSI/ISA-75.01**: Covers control valve sizing.
- **IEC 60534**: International standard for control valve performance.
- **API 598**: Specifies testing requirements for valve integrity.
- **ASME B16.34**: Governs pressure-temperature ratings for valves.
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