Spirax Sarco Spirax Sarco LE63 Stainless Steel Two Port Control Valve DN15-DN100 PN16 Equal Percentage Flow Characteristics Steam Liquid Gas Control Valve

The Spirax Sarco LE63 control valve is part of the Spira-trol™ range from leading British valve brand Spirax Sarco, designed for industrial process control. A highly reliable stainless steel two port single seated ball valve, it is suitable for modulating or on/off applications for steam systems, liquid and gaseous media, providing excellent flow control performance.The LE63 model utilizes an equal percentage flow characteristic to ensure precise modulation across the full flow range, and is widely used in the chemical, pharmaceutical, food processing and energy industries. If you're looking for a high-temperature, corrosion-resistant steam control valve, the Spirax Sarco LE63 is the ideal choice.

Product Features and Benefits

• modular design: Based on 4 valve body sizes (DN15-25, DN32-50, DN65-80, DN100) for easy maintenance and spare part replacement and reduced downtime.
• Flow Characterization Options::
  • Equal percentage: 50:1 range capability, suitable for most modulating process controls, provides good stability over the full flow range.
  • Linear: 30:1 range capability for liquid flow control at constant differential pressure.
  • Fast opening: 10:1 range capability, designed for switching applications.
• Leakage performanceMetal-to-metal seats meet Class IV (optional Class V); soft seals (PTFE or PEEK) meet Class VI, ensuring zero or low leakage operation.
• Sealing Options: Standard PTFE Chevron seals (temperature resistant to 250°C); graphite seals (high temperature to 400°C); bellows seals (zero emissions for environmentally demanding applications).
• Seats & Trim: Optional metal (stainless steel 431/316L or Stellite 6 hardfacing) or soft seal (PEEK to 250°C, PTFE to 200°C); supports low-noise and vapor-corrosion-resistant finishes for increased durability in harsh environments.
• compatibility: Perfectly matched with Spirax Sarco pneumatic actuators (PN9000, TN2000 series) or electric actuators (AEL5, AEL6 series); supports intelligent positioners (e.g. SP500) for automated control.
• compliancyComplies with EN 60534 design standard, EU Pressure Equipment Directive (PED 2014/68/EC) and CE marking; optional EN 10204 3.1 material certification ensures product quality traceability.

technical specification

• Size range: DN15 to DN100 (1/2" to 4"), covering a wide range of piping needs.
• connection method: Flanged (PN16, PN25, PN40, JIS/KS10/20); Threaded (BSP, for DN15-DN50).
• Material composition::
  • Body/Bonnet: Stainless steel EN 10213 1.4408, corrosion resistant, suitable for steam and chemical media.
  • Valve stem/plug: Stainless steel AISI 316L or 431 to ensure long term stable operation.
  • Sealing Ring: Viton or PTFE for superior sealing performance.
• Example of Kv value (flow coefficient)(Equal percentage full port standard trim):
  • DN15: 4.0 (Cv 4.6)
  • DN20: 6.3 (Cv 7.3)
  • DN25: 10.0 (Cv 11.6)
  • DN32: 16.0 (Cv 18.6)
  • DN40: 25.0 (Cv 29.0)
  • DN50: 36.0 (Cv 41.8)
  • DN65: 73 (Cv 84.7)
  • DN80: 100 (Cv 116.0)
  • DN100: 160 (Cv 185.6)
  • Supports flow-reducing trims and microflow options with Kv values as low as 0.01.
• Pressure and Temperature Ratings::
  • Maximum design pressure: 16 bar g @ 50°C at PN 16.
  • Maximum design temperature: 400°C @ 10.9 bar g (depending on seal type).
  • Minimum design temperature: -28°C (PTFE) or -10°C (graphite).
  • Maximum differential pressure: up to 40 bar g (depending on the actuator).
  • For saturated steam service, subject to steam saturation curve limits.
• Travel & TestDN15-DN50: 20 mm; DN65-DN100: 30 mm; Cold hydraulic test pressure: 24 bar g.
• Weight example(approximate, without actuator):
  • DN15: 5 kg
  • DN50: 15 kg
  • DN100: 60 kg

application scenario

The Spirax Sarco LE63 stainless steel control valve is used in a wide range of industrial steam systems, process fluid regulation and gas flow control. For example, in boiler rooms, heat exchangers or chemical production lines, it provides precise pressure and temperature control, increasing system efficiency and reducing energy consumption. Suitable for high temperature (up to 400°C), vacuum or zero-emission environments, but not recommended for EU direct food contact applications. Combined with Spirax Sarco actuators, it can be integrated into automation systems to improve overall performance.

Installation and Maintenance

• Installation Notes: Refer to the Spirax Sarco Installation Manual (IM-S24-42) to ensure that the valve is oriented correctly (flow downstream) and that an extended bonnet is used in high temperature applications.
• Maintenance spares: Seal kits, valve plug/seat kits, and bellows assemblies are available for quick replacement. Periodic inspection of seals and trim is recommended to extend service life (bellows service life up to 200,000 operations).
• documentation link(Official download for easy verification of specifications):
  • Spirax Sarco LE63 Technical Information Sheet (TI-S24-70 US) - Detailed specifications and pressure curves.
  • Spirax Sarco L Series Technical Information Sheet (TI-S24-71 EN) - Application and Kv value details.
  • TraceParts LE63 Product Specifications - CAD models and basic parameters.