Stainless Steel Spring Return (Single Acting) Pneumatic Actuated Ball Valve

UPTAI 3PC stainless steel spring return pneumatic ball valve features a fail-safe single-acting actuator and universal ISO 5211 mounting interface. Built with a 3-piece threaded body for easy in-line maintenance, it automatically resets to a safe position upon air supply failure. ISO9001 & CE certified, factory-direct supply with customizable seal and fail-mode options for high-safety industrial applications.

Product Introduction

This 3-piece pneumatic ball valve combines a precision-machined stainless steel valve body with a reliable spring-return (single-acting) pneumatic actuator. Mounted on a standard ISO 5211 high platform, the actuator fits directly without extra adapter brackets, ensuring compact structure and accurate torque transmission.

Designed for fail-safe pipeline scenarios, the valve returns to its pre-set safe position automatically when air supply is cut off, preventing equipment damage and process risks. Its 3-piece split structure allows for in-line disassembly, seal replacement and routine maintenance without removing the valve from the pipeline. With threaded end connections for fast installation, it is widely applied in petrochemical, natural gas, industrial automation and safety-critical fluid control systems.

Working Principle

The single-acting spring return actuator operates with only one compressed air supply port. When air pressure is applied, the piston compresses the internal spring pack and drives the valve stem to rotate, opening or closing the valve. When the air supply is interrupted or lost, the loaded springs automatically push the piston back to its original position, returning the valve to the pre-configured safe position (fail-open or fail-close) without any external power. This design ensures pipeline safety under unexpected air source failures.

Core Advantages

1. Fail-Safe Spring-Return Actuation

Equipped with a single-acting spring return actuator, the valve automatically resets to the pre-set safe position in case of air supply failure, effectively avoiding process accidents and equipment damage. It is the preferred choice for safety-critical industrial pipelines and hazardous working environments.

2. 3PC Split Body with Anti-Blowout Stem

The three-piece valve structure enables convenient in-line maintenance and seal replacement, greatly reducing pipeline downtime. The integrated anti-blowout valve stem design prevents stem ejection under high pressure, further enhancing operational safety and system stability.

3. Full-Process Quality Control with Certified Compliance

From raw material incoming inspection to finished actuator-valve assembly testing, we implement strict multi-stage quality control throughout production. Our factory is ISO9001 certified and all products meet CE standards, ensuring consistent and traceable quality for every batch.

4. Factory-Direct Turnkey Automation Solutions

As a professional valve manufacturer based in Wenzhou, China, we provide one-stop automated valve solutions from valve body production to actuator matching and accessory configuration. We support customized fail modes, seal materials and actuator accessories, offering reliable performance at competitive factory prices.

Key Technical Highlights

● Actuator type: Single acting (spring return), fail-close / fail-open configurable

● Standard operating air supply: 2–8 bar

● Valve body materials: 304 / 316 stainless steel (optional)

● Pressure rating: Up to 2000WOG

● Connection standard: NPT / BSPT threaded ends, compliant with ASME B1.20.1

● Mounting interface: ISO 5211 standard direct mounting pad

FAQ

1. What is the main difference between spring return and double acting pneumatic ball valves?

Spring return (single acting) valves automatically reset to a safe position when air supply fails, for fail-safe requirements. Double acting valves require air supply for both opening and closing, and hold their position on air loss, for general high-frequency cycling scenarios.

2. What position does the valve go to when air supply is cut off?

The default configuration is fail-close (valve closes automatically on air loss). Fail-open configuration is also available upon request, customized according to your process safety requirements.

3. What air supply pressure does the spring return actuator need?

The recommended operating air supply range is 2 to 8 bar. Please confirm your on-site air source pressure when placing an order, so we can match the proper actuator torque and spring force.

4. Can you supply solenoid valves, limit switches and other accessories together?

Yes. We provide a full range of actuator accessories including solenoid valves, position feedback limit switches, filter regulators and more, for a complete ready-to-install automated valve package.

5. What certifications do you have for this product?

Our manufacturing system is ISO9001 certified, and the valve products carry CE certification. Material test reports and relevant qualification documents can be provided as required.