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Valbia SR 63 S.05 Spring‑Return Pneumatic Actuator
Valbia SR 63 S.05 Spring‑Return Pneumatic Actuator
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The Valbia SR 63 S.05 is a robust spring-return (single-acting) rack-and-pinion pneumatic actuator designed for 0-90° quarter-turn valve automation. Built to the SR63 series from Valbia (part of the Bonomi Group), it is engineered for reliable fail-safe valve actuation, ISO 5211 (F05 / F07) mounting compatibility, and wide ambient operating conditions. With a working pressure of up to 8 bar (some variants show 10 bar) and a temperature range from -20 °C to +85 °C (for standard NBR seals), this actuator is suitable for many industrial environments.
It features an aluminium extruded body, anti-blowout pinion, visual indicator for open/closed, adjustable travel stops (±5°), and compatibility with NAMUR mounting devices and solenoid valve interfaces. ISO footprint is F05/F07; drive shaft (star drive) is 14 mm (Q14) in many SR63 variants.
Key Features
Spring-return (air to actuate, spring to return) for fail-safe valve positioning.
Working pressure up to 8 bar (some listings show 10 bar) for reliable actuation.
Operating temperature range: approx. -20 °C to +85 °C (with NBR seals). ISO 5211
F05 / F07 mounting pad for straightforward valve/actuator integration.
Q14 drive (14 mm star-drive) version offers direct coupling to valve drives.
Anti-blowout pinion design for improved safety and durability.
Rack-and-pinion mechanism for efficient torque transfer and longevity.
Pre-lubricated for life; sealed body with visual open/closed indicator and travel stop adjustment.
ATEX II 2GD T6 compliant for hazardous area suitability when specified.
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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.