Valves

Flow control valves and check valves

The Aventics range of flow control and check valves includes check valves (series NR01), pilot-operated check valves (series NR02), shuttle valves (SDC), dual-pressure valves (AND function), 3/2-way manual slide valves (series ML), and pneumatic pulse generators. Check valves are available in thread sizes G 1/8 to G 1; shuttle valves (SDC) cover G 1/8 to G 1. Flow control valves regulate the speed of pneumatic actuators by metered restriction; check and directional logic valves prevent backflow or implement pressure logic functions.

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Buying guide

How to choose Flow control valves and check valves

What matters when choosing: properties, comparison and typical applications.

Technical features and series

✓ Check valves NR01 (G 1/8-G 1) - spring-loaded, one-directional flow; compact threaded-body design

⚙ Pilot-operated check valves NR02 - pilot signal opens valve in blocked direction for cylinder locking circuits

⚡ Shuttle valves SDC (G 1/8-G 1) - automatically select the higher of two inlet pressures; OR function in control logic

↕ Dual-pressure valves (AND, M5-G 1/4) - outlet only when both inlet pressures are present simultaneously; safety AND logic

🛡 Manual slide valves ML and pulse generators - manual actuation for jog/setup mode; pneumatic pulse output

Selection guide and installation notes

Valve type	Function	Thread/nominal size
NR01 check valve	Block in one direction	G 1/8 to G 1
NR02 pilot-operated CV	Pilot-opens in blocked direction	G 1/8 to G 1/4
SDC shuttle valve	OR function, higher pressure passes	G 1/8 to G 1
AND dual-pressure valve	Output when both signals present	M5 to G 1/4
ML manual slide valve 3/2	Manual switching, no electrical supply	-

Typical applications

Typical applications: Check valves for pressure retention in cylinder circuits and hose-rupture protection; pilot-operated check valves in load-holding and clamping circuits; shuttle valves in redundant control circuits with two independent pilot signals; dual-pressure valves in two-hand control and safety interlocks; manual slide valves for jog mode and emergency operation without electrical supply.

FAQ

Frequently asked questions about Flow control valves and check valves

What are Aventics flow control valves and check valves used for in industrial pneumatics?

Aventics flow control valves and check valves regulate compressed air flow direction and velocity in pneumatic systems across automotive manufacturing, packaging machinery, and process automation applications. These components include throttle check valves like the Serie 344 acid-proof models operating at pressures up to 16 bar, quick exhaust valves such as the Serie 573 for rapid cylinder retraction, and 3/2-way directional valves from Serie 551 for precise air flow switching. Industrial engineers specify these valves for applications requiring reliable flow control in compressed air systems operating between -20°C to +80°C ambient temperature ranges.

How do I select the correct Aventics pneumatic valve based on technical specifications?

Aventics pneumatic valve selection requires evaluating operating pressure range, port connection size, and media compatibility for your specific compressed air system. The Serie 344 throttle check valves are available in G 1/8 and G 1 thread sizes with acid-proof construction for corrosive environments, while Serie 551 directional valves handle standard compressed air at working pressures between 2-10 bar. Flow coefficient (Cv value), response time specifications, and valve actuation method determine optimal performance for your pneumatic circuit requirements. Consider the Aventics CC02-SL stainless steel series for food-grade applications requiring enhanced corrosion resistance and cleanability.

Which international standards apply to Aventics flow control and check valves?

Aventics pneumatic valves comply with ISO 5599 for interface dimensions, ensuring interchangeability with standard pneumatic systems worldwide. The valves meet EN 60204-1 electrical safety requirements and ISO 4414 pneumatic safety standards for compressed air applications in industrial machinery. Stainless steel variants like the CC02-SL series conform to FDA regulations for food contact surfaces and comply with ATEX directive requirements when specified for potentially explosive atmospheres. All Aventics valves undergo CE marking certification demonstrating conformity with European machinery directive EN ISO 13849 for safety-related control systems.

What are the differences between Aventics throttle check valves, quick exhaust valves, and directional control valves?

Aventics throttle check valves like Serie 344 provide unidirectional flow restriction with free reverse flow for cylinder speed control, while quick exhaust valves such as Serie 573 rapidly vent compressed air directly to atmosphere for fast actuator retraction. The 3/2-way directional valves from Serie 551 actively switch air flow paths between supply, working port, and exhaust positions using manual, pneumatic, or electrical actuation. Impulse meters and pulse generators like models 0821304016 and 0820215115 provide precise counting and timing functions for automated sequences, operating at signal pressures between 1.5-10 bar with electrical output signals.

What installation requirements and connection types do Aventics pneumatic valves require?

Aventics pneumatic valves require G-thread connections ranging from G 1/8 to G 1 depending on flow requirements, with standard ISO 228-1 parallel threads ensuring leak-tight sealing when properly torqued. Installation orientation varies by valve type, with throttle check valves requiring specific flow direction alignment indicated by arrow markings, while quick exhaust valves must be mounted close to actuators for optimal performance. The valves integrate with standard pneumatic tubing systems using compression fittings or threaded adapters, requiring clean, dry compressed air filtered to ISO 8573-1 Class 7.4.4 quality standards. Mounting brackets and manifold compatibility follow ISO 5599 interface standards for seamless system integration.

What are the operating pressure ranges and temperature limits for Aventics flow control valves?

Aventics pneumatic valves operate within working pressure ranges of 2-16 bar depending on valve series, with Serie 344 throttle check valves handling maximum pressures up to 16 bar and Serie 551 directional valves rated for 2-10 bar operating pressure. Temperature operating range spans -20°C to +80°C for standard applications, with stainless steel variants like CC02-SL series extending to +150°C for high-temperature processes. The valves achieve IP65 ingress protection rating against dust and water jets when properly installed, while electrical components on solenoid-operated versions meet IP67 sealing standards. Proof pressure testing occurs at 1.5 times maximum working pressure per ISO 5599 requirements.

What maintenance intervals and service life can be expected from Aventics pneumatic valves?

Aventics pneumatic valves require preventive maintenance every 2-4 million switching cycles or annually under normal industrial conditions, with inspection focusing on seal integrity, actuator response time, and internal wear components. Service life typically exceeds 10 million cycles for throttle check valves and 5 million cycles for directional control valves when operated within specified pressure and temperature limits using ISO 8573-1 quality compressed air. Maintenance procedures include checking torque specifications on threaded connections, verifying flow characteristics against original specifications, and replacing elastomeric seals if leakage exceeds 1% of nominal flow rate. Critical applications require condition monitoring of response times and pressure drop measurements to predict component replacement before failure occurs.