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Pressure regulating fittings in pneumatic systems ensure the precise adjustment of working pressure for individual consumers without affecting the overall supply. Legris pressure regulating fittings are designed for applications where stable, metered pressure is required—such as for grippers, cylinders with sensitive piston movement, dosing, or measurement technology. They compensate for fluctuations in supply pressure and ensure reproducible actuation forces and safe process conditions.

Construction, Materials, and Electrical Insulation

Typical designs of pressure regulating fittings combine a precise adjustment valve with a connection body in a screw-in or push-in design. Parker Legris uses technical polymers for housings and actuating elements in relevant series, as well as nickel-plated brass for threaded and connection areas, to ensure corrosion resistance and mechanical strength. Polymer components reduce weight, improve electrical insulation, and minimize wear at friction points. Nickel-plated brass offers stable threads, high leak tightness, and compatibility with common fitting materials.

The choice of material influences operating temperature ranges, chemical resistance, and service life. Legris polymers are typically resistant to oils, lubricants, and many cleaning agents; for aggressive media or higher temperatures, metallic variants are preferred.

Connections, Designs, and Sealing Technology

Legris pressure regulating fittings are available with push-in connections for easy hose assembly, with metric or imperial external threads for screw-in mounting, and with compression fittings for pipelines. Seals often consist of NBR (Buna-N) for general pneumatics, FKM (Viton) for higher temperature and chemical resistance, or EPDM for applications with water and steam. The correct seal choice influences pressure retention capability, leakage rates, and maintenance intervals.

Internal sealing systems and precisely manufactured seating surfaces minimize friction and enable sensitive pressure regulation. Thread and connection dimensions comply with industry standards, ensuring direct interchangeability and easy integration into existing systems.

Performance Data: Pressure Range, Flow Rate, and Regulation Accuracy

Important characteristic values include the adjustment range of the outlet pressure, the permissible maximum supply pressure, the flow coefficient (Cv or kv), and the regulation accuracy over load changes. Typical Legris regulating fittings cover outlet pressures from a few 0.1 bar up to 10 bar; many models are designed for 0–16 bar supply pressure. Regulation accuracy is often in the range of ±0.1 to ±0.3 bar, depending on size and setting. For applications with high flow requirements, variants with a larger Kv value are provided to keep pressure drop at the regulating point low.

Important for planning and selection: The stated adjustment accuracy refers to quasi-static conditions. Dynamic load changes or rapid volume flow changes may require additional damping measures or pre-regulation.

Assembly, Adjustment, and Maintenance

Assembly takes place directly in the air distribution system or locally at the consumer. Push-in connections allow quick assembly without tools; threaded connections should be installed using sealing tape or thin sealing rings. The outlet pressure is adjusted via a continuously rotatable adjustment screw or an adjustable knurled wheel. For reproducible settings, a pressure gauge mounted nearby or a built-in manometer connection is recommended.

Maintenance requirements are low: Regular visual inspection for leaks, checking of sealing materials, and occasional cleaning of connection interfaces are sufficient in most industrial operations. In case of increased wear, sealing kits and spring mechanisms should be checked and replaced if necessary. For hygienic or dusty environments, variants with protective caps or fully encapsulated mechanisms are recommended.

Compatibility with Control and Regulation Technology

Pressure regulating fittings can be used in both manual and automated systems. For integration into process control loops, models with manometer connections or optional measuring sources are provided. If necessary, electronic pressure sensors can be installed near the regulating point to integrate pressure regulation into PLC-controlled processes. Pay attention to the correct dimensioning of lines and the decoupling of measuring points to avoid measurement errors due to pressure pulses.

Practical Application Examples

Example 1 — Assembly Automation with Grippers: In an assembly line, the supply pressure fluctuates between 6 and 8 bar. A Legris pressure regulating fitting stably sets the pressure for pneumatic parallel grippers to 5.5 bar. Result: constant gripping force, reduced reject rate, and extended service life of the seals in the gripper jaws.

Example 2 — Fine Control for Dosing Valves: In a filling plant, small quantities of liquid are dosed. A pressure regulating fitting reduces the switching and pressure pulse at the control cylinder and maintains the operating pressure at 3 bar. The finer pressure control reduces overspray and ensures reproducible filling quantities.

Example 3 — Isolated Pressure Supply in Multi-Circuit Systems: In a complex pneumatic distribution with multiple consumer circuits, a central pressure fluctuation is compensated by a single, in-line installed pressure regulating fitting. This allows different consumers to be operated at optimal pressure without modifying the main supply. Additionally, the use of nickel-plated brass increases corrosion resistance at connection points.

Further industrial applications and practical systems can be found under Application Examples and technical background on selection and integration under Technology.

Selection Criteria and Dimensioning

The following parameters are relevant for selection:

• Required outlet pressure range and permissible supply pressure
• Flow requirement (kv/Cv) depending on hose/pipe cross-section and consumer consumption
• Material compatibility (polymers vs. metal; seal type)
• Connection type (push-in, thread, compression fitting) and space requirements
• Environmental conditions: temperature, dirt, chemical exposure

When dimensioning, consider the maximum pressure drop across the fitting at full load and the combined effect of multiple regulating points in a line. For applications with rapid pressure changes, a combination of pre-regulator and local fine adjusters is often the more robust solution.

Safety and Standards Aspects

Choose products with clear pressure classification and tested sealing materials for your operating conditions. Pay attention to conformity with relevant industry standards and manufacturer specifications for pressure resistance, fatigue behavior, and operating temperatures. In safety-critical applications, additional protective measures such as pressure relief valves or mechanical stops are useful to prevent overpressure conditions.

Procurement and Spare Parts

When purchasing, ensure you buy original Parker Legris parts to guarantee material and fit accuracy. Replacement seals, spring packages, and adjustment caps are available as service kits. Documentation, spare parts lists, and technical drawings facilitate quick replacement and reduce downtime.

FAQ

Which sealing materials are recommended for aggressive media?

For aggressive chemicals and higher temperatures, FKM (Viton) is the first choice; EPDM is suitable for aqueous media and steam. NBR is economical and suitable for general pneumatics with oil-containing media. For unknown media substance lists, material tests or manufacturer approvals are required.

How do I dimension a pressure regulating fitting in terms of flow rate?

Determine the maximum volume flow of the consumer at operating pressure, calculate the required kv/Cv value considering desired pressure losses, and select a size with minimal pressure drop at full load. In case of uncertainty, coordination with manufacturer data sheets or technical support is recommended.

Can a pressure regulating fitting completely eliminate dynamic pressure fluctuations?

No. It reduces and stabilizes pressure under static or slowly changing loads. For rapid transient load changes, additional measures such as buffer volumes, damping elements, or electronic control are necessary to compensate for impulse disturbances.