What is the maximum operating pressure and temperature for Spira-trol valves?

Spira-trol valves are available up to PN100 / ANSI 600 class. Operating temperature depends on body material and stem sealing—PTFE seals suit moderate temperatures while graphite rings and bellows seals handle high-temperature steam applications. Contact us with your specific process conditions for material recommendations.

Can I retrofit an electric actuator on an existing pneumatic Spira-trol valve?

Yes. The modular design allows switching between pneumatic and electric actuators (AEL5/AEL6) without changing the valve body. This supports carbon reduction initiatives by eliminating compressed air consumption.

What trim should I select for high-pressure steam drop applications?

For high pressure differentials, consider multi-stage or anti-cavitation trim to reduce noise, vibration, and erosion. Low-noise trim is recommended for gas applications where aerodynamic noise is a concern.

Is a bellows-sealed bonnet available for fugitive emission compliance?

Yes. Spira-trol offers a robust bellows-sealed bonnet option for applications requiring zero stem leakage to meet environmental or safety regulations.

What maintenance is required, and are special tools needed?

Trim components are designed to clamp in place, making inspection and replacement straightforward. No special tools are required, and the self-aligning cage-retained seat ensures consistent performance after reassembly.

SPIRAX SARCO · CONTROL VALVES

Spirax Sarco Spira-trol General Service Control Valves – Modular Globe Valves for Steam & Industrial Fluids

Name: Spirax Sarco Spira-trol General Service Control Valves – Modular Globe Valves for Steam & Industrial Fluids
Brand: Spirax Sarco

Spira-trol control valves by Spirax Sarco - modular globe valves for steam, pressure control & industrial processes. DN15 - DN300, PN16 - PN100. Buy from

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Spira-trol General Service Control Valve Cover

Overview

The Spirax Sarco Spira-trol™ is a robust general service control valve designed for steam and other industrial fluid applications. Built on a modular design concept, this globe control valve allows plant engineers to configure multiple trim options, actuator types, and sealing arrangements within a single body envelope—reducing inventory complexity and total cost of ownership.

Spira-trol™ valves feature a cage-retained seat and plug design that delivers superior shut-off performance and reduced seat leakage compared to conventional alternatives. The top and bottom guided valve stem ensures precise alignment, extending stem seal life and minimizing maintenance. Hard trim materials are standard, providing high resistance to erosion and corrosion across a wide range of process media.

Available in sizes from DN15 to DN300 and pressure ratings from PN16 to PN100 (ANSI 150 to ANSI 600), the Spira-trol™ serves diverse industries including power generation, chemical processing, food & beverage, pharmaceuticals, and oil & gas. The valve can be paired with pneumatic or smart electric actuators for complete control valve assemblies.

Key Features

Modular design – Single body envelope accommodates multiple trim, actuator, and sealing configurations
Cage-retained seat and plug – Self-aligning design ensures better shut-off and easy maintenance
Hard trim materials as standard – High erosion and corrosion resistance for steam and aggressive media
Top and bottom guided stem – Excellent alignment extends stem seal life
Noise and cavitation reduction options – Low-noise, anti-cavitation, and multi-stage trims available
Flexible stem sealing – PTFE chevrons, high-temperature graphite rings, or bellows-sealed bonnet for zero fugitive emissions
Wide actuator compatibility – Pneumatic (PN9000 series) or smart electric (AEL5, AEL6) actuators with fail-safe options
Quick maintenance – No special tools required; trim components clamp in place

Specifications

Parameter	Value
Valve Type	Globe Control Valve (2-way)
Sizes	DN15 to DN300 (½" to 12")
Pressure Ratings	PN16, PN25, PN40, PN100 / ANSI 150, 300, 600
Body Materials	Cast Iron, SG Iron, Carbon Steel, Stainless Steel, Alloy Steel
Trim Options	Standard, Low Noise, Anti-Cavitation, Multi-Stage, Reduced Flow
Stem Sealing	PTFE Chevrons, Graphite Rings, Bellows Seal
Actuator Options	Pneumatic Diaphragm (PN9000), Electric (AEL5, AEL6)
Positioners	SP400, SP500 Smart Electro-Pneumatic Positioners
Fail-Safe	Spring-to-close, Spring-to-open (pneumatic); Supercapacitor (electric)
Flow Characteristic	Linear, Equal Percentage (characterised and balanced plugs)

Applications

Spira-trol™ control valves are deployed across a broad spectrum of industrial processes:

- Steam pressure reduction and desuperheating stations – Power plants, refineries, and process industries - Temperature and pressure control loops – Chemical, petrochemical, and pharmaceutical plants - HVAC and utility systems – Large commercial and industrial facilities - Food & beverage processing – Stainless steel options for hygienic applications - Pulp & paper, textiles, and tyre manufacturing – High-demand steam users requiring reliable modulating control

Product Images

Pneumatic Actuated Spira-trol Valve Assembly

Typical Pressure Reduction Station Installation

Spira-trol Internal Components – Stem Seal and Trim

Frequently Asked Questions

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Contact PC Engineering for pricing, availability, and technical support for Spirax Sarco Spira-trol™ General Service Control Valves. Call us or fill in our inquiry form — our engineers will respond within 24 hours.

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