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Technical Selection and Applications of Solenoid Valves (Parker)

Solenoid valves from Parker serve as precise, fast-switching actuators in mechanical and plant engineering for shutting off, filling, dosing, mixing, and controlling compressed air. These components combine electrical control with hydraulic or pneumatic fluid guidance and differ in design, material, connection type, sealing system, and switching characteristics. For industrial applications, the selection decision primarily depends on the medium, temperature range, pressure, switching frequency, and compatibility with existing connection systems.

Materials and Corrosion Resistance

Parker solenoid valves are available in various material options: brass housings for general water, oil, and air applications; stainless steel (1.4301/1.4404) for corrosive media, food, and pharmaceutical applications; and high-strength aluminum alloys for lightweight pneumatic systems. For aggressive media and high-purity processes, stainless steel welded coils and metallic seals are required. The choice of material depends on chemical resistance, permissible temperature, and mechanical stress.

Seals and Material Compatibility

Typical sealing materials include NBR (nitrile rubber) for mineral oils and general applications, EPDM for hot water and aggressive cleaning agents, FKM (Viton) for high temperatures and chemically aggressive media, and PTFE for the highest chemical resistance. In applications with food contact or high purity, FDA-compliant elastomers or PTFE elements are preferred. The choice of seal significantly influences leakage rate, switching behavior, and long-term material aging.

Designs and Functional Principles

Parker offers 2/2-way solenoid valves, 3/2- and multi-way valves, direct- and pilot-operated variants, as well as diaphragm-controlled types. 2/2-way solenoid valves are the standard solution for simple shut-off and release of a medium. Direct-operated valves do not require a minimum pressure differential and switch at low pressures, but have limited flow capacity. Pilot-operated (servo) types are designed for high flow rates and large pressure differentials. Diaphragm technology is used when media-separated switching surfaces are required, e.g., when dosing aggressive or contamination-critical liquids.

Connections, Standards, and Interface

Common connection types include cylindrical internal or external threads according to ISO/EN, BSP/G, NPT for international applications, as well as flange connections for larger sizes. For pneumatic systems, quick-connect fittings and modular ISO top plates (Festo-/NAMUR-compatible interfaces) are available, allowing easy combination with valve islands. Electrical interfaces usually follow DIN plugs (DIN 43650/ISO 4400), M8/M12 connectors, or integrated cable versions. For explosion protection requirements, ATEX and IECEx certified coil versions are available.

Performance, Switching Times, and Service Life

Parker solenoid valves are characterized by short switching times (ms to a few 100 ms), high switching frequency resistance, and long service life. Direct-operated valves offer the lowest response times, while pilot-operated types provide better flow characteristics and lower energy consumption during continuous operation. Service life is influenced by switching cycles, particle load of the medium, and temperature; therefore, filters, maintenance intervals, and suitable sealing materials are crucial.

Specifications for Common Applications

For shut-off and filling tasks in hydraulic or oil-based processes, brass housings with NBR seals and direct-operated 2/2-way valves are proven. When dosing aggressive chemicals, EPDM or FKM seals in combination with stainless steel housings are standard. In pneumatic control circuits, lightweight aluminum housings with EPDM or NBR seals are used, often as part of modular valve islands. For cleanroom or food-related processes, passivated stainless steel versions with PTFE seals are required.

Integration and Control Concepts

Parker solenoid valves can be easily integrated into control systems. Typical control types are 24 V DC for modern PLC environments and 110/230 V AC for classic installations. Modular valve islands with central pressure regulation and diagnostic options simplify wiring and maintenance. For Industry 4.0 requirements, variants with diagnostic signals, switching status monitoring, and IO-Link connectivity are available. Coils with reduced holding current are available for energy optimization.

Practical Examples

Example 1: In a filling plant for lubricants, a 2/2-way Parker solenoid valve controls the filling of individual containers. The valves are made of brass with NBR seals, direct-operated due to low pressure differentials. A flow filter upstream of the valve reduces particles and increases service life. The PLC sends pulses to the 24 V coils, enabling precisely dosed filling intervals.

Example 2: In a paint shop, several components of air supply units are controlled via Parker multi-way valves. Aluminum housings with EPDM seals and ISO plates allow for quick assembly and replacement. Pilot-operated valves ensure high flow rates with consistent switching stability, while connected pressure regulating valves ensure constant spray pressures.

Example 3: In a laboratory for chemical processing, stainless steel versions with PTFE seals are used. Here, Parker solenoid valves control corrosive fluids at small flow rates; diaphragm-controlled types prevent contact between the coil chamber and the medium. Integration into the control system is done via M12 connectors with explosion-proof coils to meet safety requirements.

Maintenance, Sources of Error, and Testing Steps

Common causes of failure include contamination in the seat area, damaged seals, electrical coil failures, and incorrect connection types. Before commissioning, filters should be checked, connection threads for leaks, and electrical voltages verified. In case of performance loss, a visual inspection of the seals, cleaning of the valve seat, and measurement of the coil resistance are recommended. Replaceable coil and seal kits simplify maintenance and reduce downtime.

Selection Criteria Summarized

• Media compatibility, pressure/temperature range, connection standard, switching frequency, flow requirements, and approvals.

For more in-depth technical data, interface descriptions, and material specifications, please refer to the technical information at https://maku-industrie.de/technik. Practical examples and application cases can be found collected at https://maku-industrie.de/anwendungsbeispiele. Our product range with Parker solenoid valves is available under this category: Solenoid Valves Category.

FAQ

Which seal is suitable for oil and lubricant applications?

For oil and lubricant applications, NBR (nitrile rubber) is the standard choice due to good resistance to mineral oils and low cost; for higher temperatures or more aggressive oils, FKM (Viton) is preferable. For abrasive or highly chemical media, PTFE or metallic seals are required.

When is a direct-operated 2/2-way solenoid valve more suitable than a pilot-operated version?

Direct-operated 2/2-way valves are suitable for low flow requirements, small pressure differentials, and the need for fast switching times. For high flow rates, large pressure differences, or when energy efficiency during continuous operation is important, pilot-operated valves are preferred.

How do I integrate Parker solenoid valves into Ethernet/IP or IO-Link controlled systems?

Parker offers compatible valve islands and modules with fieldbus gateways, as well as IO-Link-enabled coils and diagnostic functions. For integration, the valve is electrically connected via the modular top plate; the fieldbus coupling handles status and diagnostic data. Check the desired interface option in the product documentation and, if necessary, select a gateway module or IO-Link master for PLC integration.