Steam Valves
Ari Armaturen STEVI Vario Control Valve (Flanged PN25, Nodular Iron Body, Pneumatic Actuator)
Ari Armaturen STEVI Vario Control Valve (Flanged PN25, Nodular Iron Body, Pneumatic Actuator)
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The Ari Armaturen STEVI Vario Control Valve with a flanged PN25 connection, nodular iron body, and pneumatic actuator delivers precise and reliable flow control for steam, liquids, and gases across a range of industrial applications. Designed for durability and operational efficiency, this control valve combines robust construction with advanced performance features, ensuring long-term reliability even in demanding process conditions. The nodular iron body provides excellent mechanical strength and resistance to temperature fluctuations, while the PN25 pressure rating makes it suitable for high-pressure pipeline systems. Its flanged ends allow for secure, leak-free installation, and the integrated pneumatic actuator enables smooth, responsive control, making it ideal for modulating duties in heating, cooling, and process control systems.
Built on Ari Armaturen’s engineering expertise, the STEVI Vario offers exceptional versatility in industries such as power generation, chemical processing, marine engineering, and HVAC. The modular design allows for easy maintenance and adaptability to varying process requirements. With the pneumatic actuator delivering quick response and accurate positioning, this valve ensures stable control performance, reduced downtime, and improved energy efficiency in your system.
Key Features:
Flanged PN25 Connection – secure, high-pressure installation suitable for industrial pipeline systems.
Nodular Iron Body – strong, impact-resistant construction with excellent temperature and pressure tolerance.
Pneumatic Actuator – precise, responsive control for modulating or on/off applications.
Wide Application Range – suitable for steam, liquids, and gases in process industries.
Modular Design – easy servicing and adaptability to different process conditions.
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FAQ's
What is the difference between a valve and an actuator?
What types of actuators are available?
The main types of actuators are:
Pneumatic actuators – use compressed air for fast, reliable operation.
Electric actuators – use electrical power for precise control.
Hydraulic actuators – use fluid pressure for high-torque applications.
Each type offers unique advantages depending on the environment, media, and system control needs.
How do I choose the right actuator for my valve?
To select the correct actuator, consider:
Valve type and torque requirement
Power source available (air, electric, or hydraulic)
Operating environment (temperature, humidity, hazardous area)
Control signal type (on/off or modulating)
Matching actuator torque and compatibility with the valve’s ISO mounting ensures reliable performance.
What are the main types of valves used in automation?
The most common valves in automated systems include:
Ball valves – for tight shutoff and quick operation.
Butterfly valves – for larger flow control with compact design.
Globe valves – for precise throttling and flow regulation.
Check valves – to prevent backflow.
Gate valves – for full bore flow isolation.
What’s the difference between a double-acting and spring-return actuator?
Double-acting actuators use air (or power) to both open and close the valve.
Spring-return actuators use air to open (or close) the valve, and a built-in spring to automatically return it to a safe position when power or air is lost — ideal for fail-safe operation.
How often should valves and actuators be serviced?
Regular maintenance intervals depend on operating conditions, but a good rule of thumb is to inspect every 6–12 months.
This includes checking for leaks, lubrication, seal wear, and actuator responsiveness to prevent unexpected downtime.