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How Pneumatic Check Valves and One-Way Valves Work

Pneumatic valves serve as the backbone of automated fluid power systems, regulating air flow, pressure, and direction with precision. From simple pneumatic air valves used in basic on/off operations to sophisticated pneumatic control valves integrating feedback loops, these components ensure efficient energy transfer, rapid response times, and minimal maintenance. Designed in various sizes and port configurations, pneumatic valves adapt seamlessly to industrial, automotive, and process engineering applications, offering options like manual control valves, solenoid-actuated variants, and pilot-operated designs for enhanced performance.
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COVNA Manual Wafer Type Butterfly Valve

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3/2-Way Pneumatic Solenoid Valve, Fast Response, Industrial Use

3/2-Way Pneumatic Solenoid Valve, Fast Response, Industrial Use

A 3/2-way pneumatic solenoid valve with three ports and two positions switches airflow in under 10 ms. Nylon composite body and FKM seals withstand 10 bar and –10 °C to +60 °C. The 24 V DC coil draws 5 W via a DIN connector. Precision spool limits leakage to 0.2%, while a spring return ensures instant reset. Rated IP65 and over one million cycles durability for fast packaging and robotics.

Compact Pneumatic Control Valve with Manual Override

Compact Pneumatic Control Valve with Manual Override

Compact pneumatic control valve features a manual override knob for testing or emergency operation. Brass body and 1″ G ports handle 0–8 bar. Quick-connect fittings allow tool-free installation. Ergonomic knob and flow scale provide ±3% repeatability. PTFE-packed spindle and electro-polished passages minimize wear and pressure drop. Snap-on mounting clip and captive bonnet screw enable easy maintenance in pneumatic panels and calibration rigs.

High-Torque Pneumatic Actuator Valve, 24V DC Solenoid

High-Torque Pneumatic Actuator Valve, 24V DC Solenoid

Double-acting pneumatic ball valve integrates a 24 V DC solenoid actuator delivering 150 Nm torque at 6 bar. Anodized aluminum body and stainless steel shafts resist corrosion. The 8 W coil connects via an IP67 M12 plug. With a Cv of 4.5 and over 500,000 cycles rating, it suits water treatment, HVAC dampers, and industrial automation needing high-torque, reliable control under harsh conditions.

Stainless Steel Pneumatic Butterfly Valve with Actuator

Stainless Steel Pneumatic Butterfly Valve with Actuator

Wafer-style pneumatic butterfly valve features an SS316 body and disc with EPDM seat for tight shutoff at 0–10 bar and –20 °C to +120 °C. ISO 5211 mounting accepts double-acting or spring-return actuators. PTFE-coated stem bearings ensure smooth operation beyond 200,000 cycles. Compact wafer design fits between flanges. Ideal for corrosive fluids in wastewater treatment, desalination, and chemical processing.

We Have The Best Solutions for Your Business

COVNA GROUP CO., LTD is a world-leading valve manufacturer which specialized in solenoid valves, pneumatic valves, and electric valves for pipeline fluid control. COVNA originated from German technology, has its own R&D, design, production, sales team, and aims to be the global automation application service provider.

COVNA production range includes solenoid valves, pneumatic valves, electric valves, gate valves, globe valves, butterfly valves, control valves, safety valves, and various special valves. COVNA products are widely used in Water & Waste water treatment, Automation, Petroleum, Chemical, Electric power, Metallurgy, Mining, Paper-making, Pharmaceutical Industries, etc.

COVNA team make a rapid response to customer's requirements, provide professional product selection guidance and reliable valve application solutions.So far, COVNA has achieved ISO 9001 Quality Management System Certification, CE Certification, RoHS Certification.

Why Choose COVNA

Global Expertise

COVNA delivers valve solutions to customers in over 120 countries, combining global market expertise with localized support to meet diverse industry needs and ensure reliable performance worldwide.

Advanced Technology

Backed by German technology, COVNA specializes in solenoid, pneumatic, and electric valves, providing innovative fluid control solutions designed for precision, efficiency, and long-lasting durability.

Strong Manufacturing

With a modern factory, CNC machining, and strict quality testing, COVNA ensures every valve meets international standards, delivering consistent reliability for water, oil, gas, and automation industries.

Trusted Brand

Recognized as a preferred supplier by global partners, COVNA has built long-term trust through consistent product quality, professional technical support, and comprehensive after-sales services.

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FREQUENTLY ASKED QUESTION

Do You Have Any Question?

A pneumatic valve is an actuator that uses compressed air to control the flow or direction of a fluid. Common types include solenoid valves, directional valves, flow control valves, check valves, pressure regulating valves, and actuators such as ball valves and butterfly valves.

A three-way valve has three ports and two channel states and is primarily used for one-way control or exhaust. A five-way valve has five ports and two states and can switch double-acting cylinders in both forward and reverse directions. A three-way valve is used for quick exhaust or simple switching, while a five-way valve is used for complex circuits or double-acting actuators.

A three-way valve has three ports and two channel states and is primarily used for one-way control or exhaust. A five-way valve has five ports and two states and can switch double-acting cylinders in both forward and reverse directions. A three-way valve is used for quick exhaust or simple switching, while a five-way valve is used for complex circuits or double-acting actuators.

Leakage: Check seals for wear and threads for tightness. Seizure: Clean the valve core, lubricate the guide, or replace the filter element. Coil inactivity: Measure voltage and check coil resistance. Slow actuation: Clean the air source, adjust the speed regulating valve, or replace the spring.

Regularly clean the air inlet filter and keep the lubrication unit filled with oil. Check joints, seals, and springs for wear. Verify air leakage every six months. Replace internal components promptly in case of severe contamination or wear to extend the life of the valve body and actuator.

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