Spirax Sarco STERI-TROL (SA/SH/SQ series and others) is a 316L stainless steel control valve for clean steam and process fluids. The valve has a PN16 design pressure rating, an internal surface roughness of 0.4 micrometres, and a white Viton stem seal certified to FDA and other standards. It provides a maximum turndown ratio of 50:1. Available connections include butt-weld, flanged and sanitary clamp options. Applications include clean steam line control, process fluid mixing and soft-seated tight shut-off in clean piping systems.
Spirax Sarco control valves SA/SH/SQ 3/4 angle product image
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STERI-TROL 316L Stainless Steel Clean Steam and Process Fluid Control Valve | Spirax Sarco
316L stainless steel 2-way/3-way control valve for clean applications, designed for clean steam and process fluid control, with optional soft seal.
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Specifications
- Valve body material
- 316L stainless steel
- Valve body design pressure rating
- PN16
- Maximum design pressure
- 16 bar g @ 120°C
- Maximum design temperature
- 200°C @ 14 bar g
- Minimum design temperature
- -20°C
- Maximum operating temperature (Viton seal)
- 170°C
- Minimum operating temperature
- -10°C
- Leakage rate (metal seal)
- 0.01% of Kv
- Leakage rate (soft seal)
- IEC 534-4 Class VI
- Rangeability (equal percentage)
- 50:1
- Rangeability (linear)
- 30:1
- Internal surface roughness
- 0.4 μm (mechanically or electropolished)
- External surface roughness
- < 0.6 μm
- Connection types
- Butt weld, socket weld, threaded, flanged, sanitary clamp
- Valve sizes
- DN15, DN20, DN25, DN32, DN40, DN50, DN65, DN80, DN100
- Plug design
- Parabolic
- Flow characteristics
- Equal percentage, linear
- Kvs range
- 4 to 160 (standard), minimum 0.4 (micro-flow plug)
- Seat sealing options
- Metal seal (stainless steel), soft seal (white Viton)
- Stem seal material
- White Viton (approved to 3A, FDA, USP26 Class VI)
Application scenarios
Control of clean and pure steam pipelines
Used for on-off and continuous modulating control in clean or pure steam pipelines, with actuators and positioners available for connection to control systems.
Clean process fluid mixing control with the SQ three-way valve
The SQ three-way valve provides mixing control at clean process fluid blending or formulation points. Its linear flow characteristic is suitable for liquid fluid control under fixed differential pressure conditions.
Tight shut-off with soft seals in clean process pipelines
White Viton soft-seal valve seats can be selected for clean process fluid or clean steam pipelines to provide tight shut-off and on-off control.
Selection points
316L stainless steel valve body with sanitary surface finishing and material certificates
The valve body is made of 316L stainless steel, with an internal surface roughness of 0.4 μm and mechanical or electropolishing available. It complies with the sanitary design requirements of ASME BPE 2002 and 3A, EHEDG. EN10204 3.1 certification is supplied as standard.
White Viton soft seals with FDA, 3A, and USP26 Class VI compliance
The stem seal and soft-seal valve seat can be made of white Viton, which is approved by FDA, 3A, and USP26 Class VI. The soft-seal leakage rate meets IEC 534-4 Class VI.
One series covering two-way angle, two-way in-line, and three-way mixing valve bodies
The STERI-TROL S series includes the SA two-way angle pattern, SH two-way in-line connection, and SQ three-way configuration. The SQ three-way valve can be used for fluid mixing control.
Equal percentage and linear flow characteristics with defined rangeability
The valve is available with an equal percentage flow characteristic and 50:1 rangeability, or a linear flow characteristic and 30:1 rangeability.
Standard Kvs from 4 to 160 with optional minimum Kvs 0.4 micro-flow plug
The standard Kvs range is 4 to 160, with an optional micro-flow plug providing a minimum Kvs of 0.4.
Multiple end connections with pneumatic actuators and smart positioners
Butt weld, socket weld, threaded, flanged, and sanitary clamp connections are available. The valves can be supplied with PNS3000/PN9000 series pneumatic actuators and SP400/SP500 smart positioners.
Installation & maintenance notes
Connect and commission the actuator and positioner according to the associated documentation
When installing the associated electric or pneumatic actuator and positioner, complete the power or air supply connections and commissioning in accordance with the relevant actuator technical information sheet.
FAQ
What are the differences between the SA, SH, and SQ STERI-TROL clean-service control valves, and how should the appropriate model be selected?
The main difference between the SA, SH, and SQ valves is their body configuration. The SA has a two-way angle pattern design, the SH has a two-way in-line connection design, and the SQ has a three-way configuration for applications requiring fluid mixing control. The specific model should be selected according to the pipeline connection type, fluid control requirements, and installation conditions.
What fluid control applications are STERI-TROL control valves suitable for?
STERI-TROL control valves are designed for on-off and continuous modulating control of clean steam, pure steam, and process fluids. The SQ three-way valve can also be used for fluid mixing control. The actual application must be confirmed based on the medium, operating conditions, and system requirements.
How should the flow characteristic of a STERI-TROL valve be selected according to the control requirements?
The STERI-TROL series offers different flow characteristic options. The SAE equal percentage characteristic is suitable for most continuous modulating control applications, while the SHE is suitable for low-flow control. The SAL and SHL use a linear characteristic and are primarily suitable for liquid fluid control under fixed differential pressure. The specific selection should be based on the control system requirements and flow conditions.
Which actuator and positioner configurations are supported by STERI-TROL control valves?
STERI-TROL control valves can be supplied with electric actuators, pneumatic actuators, and positioners. Pneumatic actuators include the PNS3000, PNS4000, PN9000E, and PN9000R series. Positioners include the PP5, EP500S, EP500A, SP400, and SP500 series. The specific combination must be confirmed according to the control method and system configuration requirements.
Which technical parameters should be considered when selecting and maintaining STERI-TROL control valves?
Valve size, connection type, flow characteristic, seat configuration, leakage class, rangeability, stroke, and operating pressure and temperature range should be considered during selection and maintenance. The series covers valve sizes from DN15 to DN100 and provides butt weld, socket weld, threaded, flanged, and sanitary clamp connections. The specific configuration must be confirmed according to the actual model and application conditions.