Spring Return Pneumatic Butterfly Valve
Product Overview:
The spring return pneumatic butterfly valve is designed for reliable operation and enhanced safety in industrial settings. It features a spring return actuator that combines pneumatic control with a fail-safe mechanism. When air pressure is applied, the actuator opens the valve. When air pressure is removed, a spring automatically closes the valve. This design ensures the valve returns to a safe position in case of power or air supply failure.
Pneumatic Actuator Parameters:
– Actuator Type: Spring return pneumatic actuator (single-acting actuator).
– Operating Pressure: 3 to 8 bar (43 to 116 psi).
– Temperature Range: -20°C to 80°C (-4°F to 176°F).
– Material: Durable aluminum or stainless steel.
– Installation Standard: ISO 5211 for easy installation and compatibility.
Difference between Single Acting (Spring Return) and Double Acting Actuators:
– Single Acting (Spring Return):
– Function: Opens with air pressure and closes automatically with a spring when air is lost. Ensures automatic return to a preset or safe position if air supply fails.
– Advantage: Ideal for safety-critical applications needing automatic closure on air supply loss. Provides a simple and cost-effective fail-safe solution.
– Disadvantage: Less control accuracy compared to double-acting actuators. Cannot hold position without air supply.
– Double Acting Actuator:
– Function: Requires air pressure to both open and close the valve. Offers precise control of valve position.
– Advantage: Provides accurate control and position holding. Suitable for applications with continuous air supply.
– Disadvantage: Cannot automatically close or open if air supply is lost.
When to Use a Single-Acting Actuator:
Single-acting actuators are ideal in environments needing safety and automatic reset functions. Suitable for:
– Safety-Critical Systems: Automatically closes to a preset position when air supply fails, such as emergency shutdown systems or high safety requirement processes.
– Fail-Safe Requirements: Where automatic closure is needed to prevent damage or danger if air supply fails.
– Simple Control Applications: Where position accuracy is less critical, but automatic fail-safe reset is required. Suitable for systems with infrequent pneumatic operation and high safety priority.
Application Conditions:
– Media Compatibility: Handles various media including water, air, gas, steam, and chemicals. The valve’s materials ensure compatibility with many substances.
– Working Conditions: Suitable for medium to high pressure environments. Operates effectively over a wide temperature range and remains reliable under challenging conditions.
Summary:
The spring return pneumatic butterfly valve provides reliable performance and enhanced safety. Its spring return actuator ensures automatic closure in case of air supply failure, making it suitable for safety-critical applications. It offers a simpler solution compared to double-acting actuators but with lower control accuracy. The valve is versatile, performing well across various media and operating conditions, making it an excellent choice for many industrial applications.
