Valves

Solenoid valves 2/2 and 3/2-way

2/2-way and 3/2-way solenoid valves switch compressed air and fluid lines on command from a control current. A 2/2-way valve either blocks or opens a single passage; a 3/2-way valve alternately connects pressure inlet, actuator and exhaust port, thereby controlling single-acting cylinders or actuators. The range covers body materials brass, stainless steel (ES) and aluminium in port sizes from M5 and G 1/8" up to G 2".

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Boge ENTLAST 14 SCH. Entlastventil (NO) G 1/4" für Schraubenkompressoren, 230 VAC
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Buying guide

How to choose Solenoid valves 2/2 and 3/2-way

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

Switching functions and configurations

⚙ 2/2 normally open (NO) - passage open at rest, safe position for ventilation circuits

⚙ 2/2 normally closed (NC) - shut-off valve closed in normal operation, opens when energised

⚙ 3/2 NO (MO series) - actuator pressurised at rest, cylinder rod extends

⚙ 3/2 NC (M series) - actuator exhausted at rest, spring retraction

✓ Air spring return (type 10) - return via system pressure instead of mechanical spring

⚡ Supply voltage 12-230 V DC/AC - compatible with PLC outputs and mains relay controls

Materials and port sizes overview

Series	Body	Port sizes	Seal materials
MO/M 2xx (2/2 brass)	Brass	G 3/8" - G 2"	NBR, EPDM, FKM
MO/M 3xx (3/2 brass)	Brass	G 3/8" - G 1-1/2"	NBR
MO/M 2xx ES (2/2 s/s)	Stainless steel	G 3/8" - G 2"	EPDM, FKM, NBR
MO/M 3xx ES (3/2 s/s)	Stainless steel	G 1/8" - G 1/4"	NBR
M 3xx OKO (3/2 Al)	Aluminium	G 3/8"	NBR
M 2M5/3M5 ES (mini)	Stainless steel	M 5	NBR

Typical applications

Typical applications: Shut-off and release of compressed air, water and gas lines; control of single-acting pneumatic cylinders in handling systems; compressor unloading during start-up (NO version); food and chemical process engineering with stainless steel and EPDM seals; biodiesel transfer lines (aluminium OKO types); miniature pneumatics in medical devices (M5 thread).

FAQ

Frequently asked questions about Solenoid valves 2/2 and 3/2-way

What are 2/2-way and 3/2-way solenoid valves and what industrial applications do they serve?

2/2-way and 3/2-way solenoid valves are pneumatic control devices that regulate compressed air flow in industrial automation systems, with 2/2-way valves having two ports for simple on/off control and 3/2-way valves having three ports for directional control applications. These valves operate within 0-16 bar pressure ranges and serve critical functions in manufacturing automation, packaging machinery, process control systems, and material handling equipment. Industries including automotive assembly, food processing, pharmaceutical manufacturing, and chemical processing rely on these valves for precise air flow control in actuator positioning, cylinder operation, and safety shutdown systems where reliability and response time are paramount for production efficiency.

What are the key technical selection criteria for 2/2-way and 3/2-way solenoid valves?

Technical selection criteria for 2/2-way and 3/2-way solenoid valves include operating pressure range, port connection size, voltage specification, and fail-safe position configuration. The MO 2200 ES and M 2200 ES series demonstrate typical specifications with 0-16 bar operating pressure, G 2 inch threaded connections, and voltage options including 12V DC, 24V DC, 24V AC, 115V AC, and 230V AC. Normally open configurations like the MO series provide flow when de-energized, while normally closed configurations like the M series block flow when de-energized, with selection depending on fail-safe requirements and system safety protocols for specific pneumatic applications.

Which international standards and certifications apply to industrial solenoid valves?

Industrial solenoid valves must comply with ISO 5599 for pneumatic valve interface standards, EN 60204-1 for electrical safety requirements, and ISO 14903 for explosion-protected pneumatic systems where applicable. ATEX certification under directive 2014/34/EU is mandatory for valves used in potentially explosive atmospheres, while IP65 or IP67 ingress protection ratings ensure adequate dust and water resistance per IEC 60529. Additional standards include ISO 4414 for general pneumatic system safety requirements and EN 983 for safety-related pneumatic control systems, with DVGW certification required for gas applications in European markets to ensure compliance with pressure equipment directive requirements.

What are the differences between normally open and normally closed solenoid valve configurations?

Normally open solenoid valves like the MO 2200 ES series allow flow passage when de-energized and close the flow path when electrical power is applied, making them suitable for fail-safe applications requiring air flow during power failures or emergency conditions. Normally closed solenoid valves like the M 2200 ES series block flow when de-energized and open when electrical power is applied, providing safety shutdown capabilities and energy-efficient operation for systems requiring closed positioning during standby periods. The choice between NO and NC configurations depends on system safety requirements, energy consumption considerations, and the desired fail-safe position during power loss or emergency stop conditions in pneumatic control applications.

What installation requirements and connection types apply to 2/2-way and 3/2-way solenoid valves?

Solenoid valve installation requires proper mounting orientation with coil vertical or horizontal positioning as specified by manufacturer guidelines, adequate clearance for coil removal, and secure electrical connections meeting IP65 or higher protection standards. Thread connections include G 1-1/2 inch and G 2 inch BSP parallel threads as shown in the MO 21120 ES and MO 2200 ES series, with pipe thread sealant or O-ring seals required to prevent leakage at operating pressures up to 16 bar. System compatibility demands matching voltage specifications, proper grounding per IEC 60204-1, and integration with PLC control systems using appropriate relay or solid-state switching interfaces rated for the valve electrical characteristics and switching frequency requirements.

What safety ratings and operating conditions do industrial solenoid valves support?

Industrial solenoid valves typically operate within -10°C to +60°C ambient temperature ranges with media temperatures up to +80°C for compressed air applications, while maintaining IP65 ingress protection against dust and water ingress per IEC 60529. Operating pressure capabilities extend from vacuum to 16 bar maximum working pressure as demonstrated by the ES series valves, with burst pressure ratings typically 4 times the maximum working pressure for safety margin compliance. Electrical safety classifications include Class F or Class H insulation systems per IEC 60085, with coil protection against voltage fluctuations of ±10% and short-circuit protection through appropriate fusing or circuit breaker coordination to prevent system damage during fault conditions.

What maintenance schedule and service life expectations apply to pneumatic solenoid valves?

Pneumatic solenoid valves require preventive maintenance every 6 months including visual inspection of electrical connections, coil housing integrity, and port seal conditions, with annual testing of switching response time and leakage rates per ISO 5599 standards for optimal performance. Service life expectancy ranges from 5-10 million switching cycles for standard duty applications, with higher cycle ratings available for continuous duty models depending on operating pressure, switching frequency, and media cleanliness in the pneumatic system. Critical maintenance indicators include increased switching time, audible coil noise, external leakage at threaded connections, and electrical resistance measurements outside manufacturer specifications, with complete valve replacement recommended when internal leakage exceeds 1% of nominal flow capacity per ISO standards.