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SaveAir Inline Pressure Regulators — Precise Pressure Stabilization Directly in the Line

SaveAir Inline Pressure Regulators are compact control valves, installed directly in pipe or hose lines, for precise adjustment and stabilization of pressure in pneumatic and light hydraulic systems. They combine low dead volumes, fast response times, and robust materials to dampen pressure peaks, protect end devices, and improve energy efficiency through demand-oriented pressure supply. SaveAir models are suitable where space is limited, integration effort is minimal, and control quality must be high—for example, in manufacturing machines, assembly facilities, testing systems, as well as in mobile semi-finished products and robotic axes.

Design and Materials

The housings of SaveAir inline pressure regulators are predominantly made of stainless steel (1.4301 / AISI 304) or high-strength aluminum with surface treatment for corrosion resistance. For demanding environments, versions in stainless steel 1.4404 / AISI 316 are available. Internal components such as pistons, guides, and valve seats are made from hardened steels or bronze to minimize wear. Elastomer seals are optionally available in NBR (nitrile rubber) for general pneumatics, FKM (Viton) for higher temperature and chemical resistance, or EPDM for steam and hot water applications. For special media, such as ultra-pure air in painting or food processes, PTFE-coated spindles and FFKM seals are used.

Typical Designs and Connection Variants

SaveAir inline pressure regulators are available in several designs: straight inline version for direct line integration, angle designs for space-saving, and flange models for higher flow rates. Connection sizes cover common standards, typically G 1/8, G 1/4, G 3/8, G 1/2 according to ISO/EN, as well as NPT variants for international applications. For quick connection and modular pneumatics, push-in connectors and plug-in connections are available. High pressure ranges are realized through reinforced body cross-sections and larger diaphragm areas; low-pressure and micro-regulators are characterized by finer adjustment scales and smaller switching masses.

Functionality and Control Behavior

SaveAir inline regulators operate on the principle of pilot-operated diaphragm or piston control. An adjustable spring preload mechanism sets the desired output pressure level. In the event of load changes, the regulators react within milliseconds, as internal leakage and dead volumes are minimized. The resulting control behavior is linear and stable, with minimal hysteresis. Models with integrated fine regulator or fine adjustment screw allow precise adjustment for applications such as test benches, dosing units, or measuring devices.

Applications and Process Integration

SaveAir inline pressure regulators are used where pressure needs to be controlled directly in the supply line: feeding grippers and vacuum replacement, pressure limitation on drives, safeguarding pressure sensors, regulating cylinder speeds, and pneumatic tools. In painting and coating processes, they ensure constant spray pressures; in test benches, they stabilize test pressure for leak tests. The low dead volume capacity minimizes delays during pressure changes, thereby shortening cycle times. For integration into plant controls, versions with electrical position feedback or with built-in pressure transmitters are available, providing 4–20 mA or 0–10 V signals.

Practical Examples

Example 1 — Assembly Automation: In an assembly station for electronic components, a SaveAir inline pressure regulator controls the air pressure to the gripper unit. The regulator is installed directly in the supply line to the suction gripper, connections G 1/8. NBR seals are used because the ambient temperature is moderate. Direct line integration reduces the reaction time during pick-and-place by 30%, thereby reducing the cycle time of the station. The regulator protects the gripper from overpressure and enables constant suction performance despite fluctuating supply voltage.

Example 2 — Test System for Leak Tests: In a leak test for hydraulic components, a SaveAir inline pressure regulator stabilizes the test pressure to ±0.2 bar. The version is made of stainless steel 1.4404 with FKM seals due to oil-containing media. Additionally, an integrated pressure sensor is connected, whose 4–20 mA output is fed into the test control. Precise regulation reduces repeat tests and increases test throughput.

Example 3 — Paint Line: In an industrial paint line, SaveAir regulates the pressure of spray guns to minimize paint mist and material consumption. Aluminum housing with PTFE-coated spindle prevents particle formation. By using several inline regulators along the supply line, individual fine adjustment can be made per paint station, which increases surface quality and reduces rejects. Further application information can be found at Application Examples.

Maintenance, Installation Instructions, and Leakage Management

During installation, ensure a clean pipeline and suitable sealing surfaces. Threaded connections should be made with appropriate sealants (PTFE tape or liquid thread sealant compatible with the sealing material). For high vacuum or cleanroom applications, special versions with metallic seals and vacuum-compatible materials are available. Maintenance intervals depend on the medium and operating cycle; typically, inspections of seals and functional checks are recommended every 6–12 months. Replacement kits for diaphragms, springs, and seals are available to minimize downtime. For aggressive media, the use of FFKM seals and corrosion-resistant materials is recommended.

Specifications and Selection Criteria

Key criteria for selecting a SaveAir inline pressure regulator are the desired control range, the required flow rate (Cv value), connection type, temperature range, material compatibility, and integration options (e.g., sensor technology or electrical feedback). Environmental conditions such as dirt, moisture, and chemical exposure should also be considered. Correct dimensioning prevents pressure drops and ensures constant performance over the life cycle.

• Control ranges: 0–0.5 bar to 0–20 bar; Connection sizes: G 1/8 to G 1/2; Materials: Aluminum, 1.4301, 1.4404; Seals: NBR, EPDM, FKM, FFKM

Quality Assurance and Standards

SaveAir regulators are manufactured according to common industry standards. Corrosion and pressure tests, leakage rate measurements, and material certificates are part of quality assurance. For safety-relevant applications, versions with TÜV or comparable test marks are available. Documentation includes test reports, material certificates (EN 10204), and leak tightness verifications.

Integration into Plant Management

For digital integration, some SaveAir models offer optional sensor technology and interfaces. Pressure sensors with analog output or IO-Link enable real-time monitoring of pressure deviations. Data can be fed into PLC systems and incorporated into maintenance plans to enable predictive maintenance. Information on technical infrastructure and complementary components can be found at Technology.

Procurement and Variants

SaveAir inline pressure regulators are available as standard modules as well as customized special versions. Custom designs include specific connections, modified control ranges, special material combinations, and integrated measurement technology. For selection support, it is recommended to specify the medium, temperature, desired output pressure, flow requirements, and installation situation precisely.

FAQs

1. Which media are SaveAir inline pressure regulators suitable for?
SaveAir regulators are primarily designed for compressed air and inert gases; with suitable materials and seals, they can be used for oil-containing media, some hydraulic oils, water-based media, and aggressive gases. For special media, check material and seal resistance.

2. How are the correct size and control range chosen?
Select the size based on the maximum volume flow or Cv value of the application and the desired control range. Additionally, consider pressure losses in the line and temperature fluctuations. For dimensioning support, we provide characteristic curves and calculation data.

3. Which seals are suitable for higher temperatures or chemicals?
For higher temperatures and chemically aggressive media, FKM (Viton) and FFKM are the first choice; PTFE-coated components reduce friction and increase resistance. For extreme chemical loads or food service, consultation regarding material approval is recommended.