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P.C. Engineering Corporation
Spirax Sarco Spira-trol Two-Port Control Valves LE/LF/LL Series DN15-DN100

Overview

The Spirax Sarco Spira-trol is a range of two-port, single-seat globe control valves designed for precise modulating or on/off control in steam, condensate, and general process applications. These valves feature a cage-retained seat design and are available in EN standard (LE, LF, LL) and ASME standard (LEA, LFA, LLA) configurations, covering sizes from DN15 to DN100 (½" to 4").

Spira-trol valves are engineered for compatibility with Spirax Sarco pneumatic and electric linear actuators, enabling automated process control in industrial plants. The parabolic plug design ensures stable flow characteristics, while multiple trim and sealing options allow customization for demanding applications including high-temperature steam service and zero-emission requirements.

Designed in accordance with EN 60534 and fully compliant with the European Pressure Equipment Directive 2014/68/EC, the Spira-trol series is a reliable choice for critical control loops in manufacturing facilities.

Key Features

  • Single-seat globe valve with cage-retained seat for reliable shut-off
  • Three flow characteristics available: Equal percentage (LE/LEA), Linear (LL/LLA), Fast opening (LF/LFA)
  • Balanced and unbalanced plug options with Class IV, V, or VI leakage ratings
  • Body materials: Cast iron (SG iron), Carbon steel, Stainless steel (316L/CF8M)
  • PTFE chevron packing standard; bellows seal with graphite secondary seals available for zero-emission applications
  • Soft seating options (PTFE up to 200°C, PEEK up to 250°C) for Class VI shut-off
  • Low noise and anti-cavitation trim available
  • Extended bonnet option for hot/cold applications or large pipe lagging
  • Compatible with PN1000, PN9000, PN2000, TN2000, EL3500, EL7200, and other Spirax Sarco actuators

Specifications

ParameterValue
Valve TypeTwo-port single-seat globe valve
Size Range (EN)DN15, DN20, DN25, DN32, DN40, DN50, DN65, DN80, DN100
Size Range (ASME)½", ¾", 1", 1¼", 1½", 2", 2½", 3", 4"
Pressure RatingEN 1092 PN16 / ASME Class 125 (Cast iron), ASME Class 150 / JIS 10K (Carbon & Stainless steel)
Body MaterialsCast iron (EN-GJS-400-18 / ASTM A126B), Carbon steel (GP240GH / A216 WCB), Stainless steel (1.4408 / CF8M)
Stem/Plug MaterialAISI 431 / AISI 316L Stainless steel
Seat MaterialAISI 431 SS (standard), 316L with Stellite 6 facing (optional), PTFE/PEEK (soft seat)
Leakage ClassClass IV (balanced), Class V (unbalanced optional), Class VI (soft seal)
RangeabilityEqual: 50:1, Linear: 30:1, Fast: 10:1
Travel20 mm (DN15–DN50), 30 mm (DN65–DN100)
Max Temperature (Soft Seat)200°C (PTFE), 250°C (PEEK)
ConnectionsScrewed BSP/NPT, Flanged EN 1092, ASME, JIS/KS
Design StandardEN 60534, PED 2014/68/EC compliant

Applications

Spira-trol control valves are widely used across process industries where accurate flow modulation or on/off control is required:

- Steam systems: Temperature and pressure control in heat exchangers, jacketed vessels, and sterilizers - HVAC and building services: Hot water and steam heating control - Food & beverage processing: Hygienic process control with stainless steel construction - Pharmaceutical and chemical plants: Precise dosing and reactor temperature control - Pulp & paper, textiles, and general manufacturing: Condensate and process fluid regulation

The equal percentage characteristic suits most modulating applications, while the linear option is preferred where differential pressure remains constant. The fast opening variant is ideal for simple on/off duties.

Frequently Asked Questions

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Spirax Sarco Spira-trol Two-Port Control Valves LE/LF/LL