Air & Gas Safety Valves — Compressor & Pneumatic Protection

Compressed air and gas systems require specialized safety protection to prevent dangerous overpressure and uncontrolled discharge. Aquatrol’s air and gas relief valves deliver reliable, rapid response protection for compressor outlet protection, pneumatic lines, gas cylinders, and sealed equipment. All valves are ASME-certified with full capacity documentation.

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Why Aquatrol Air & Gas Valves

Air and gas systems experience rapid pressure spikes, vibration, and temperature swings that demand robust, fast-responding relief. Aquatrol’s direct-acting and pilot-operated designs are specifically engineered for gas media, with tight set-pressure tolerances and rapid lift response. Each valve undergoes capacity testing to verify flow rating at your exact operating pressure.

Compressor outlet protection is critical—sustained overpressure degrades gaskets, fatigues vessels, and creates safety hazards. Our valves are sized specifically for compressor displacement, outlet temperature, and downstream pressure to ensure proper relief without starving your pneumatic system. We help you avoid undersizing (inadequate protection) and oversizing (system deadheading).

From low-pressure pneumatic tools to high-pressure industrial gas systems, from dry air to moisture-laden compressor discharge, our series handle diverse conditions. Stainless steel options protect systems in corrosive environments, while standard carbon steel provides economy for general shop air. All designs include adjustable set pressure and straightforward field maintenance.

Series Pressure Range Media Connection
55 30–1,000 PSIG Air, nitrogen, gas NPT, SAE
140 20–800 PSIG Compressed air NPT, ISO
140 20–1,000 PSIG Industrial gas NPT, SAE
88/89 50–600 PSIG Gas, air NPT
120 50–1,000 PSIG High-pressure gas ISO, SAE

Common Applications

  • Rotary and reciprocating compressor outlet relief
  • Pneumatic line pressure limiting and system protection
  • Gas cylinder safety limiting and overpressure relief
  • Industrial nitrogen and process gas system protection
  • HVAC compressor and refrigeration charge protection
  • Portable compressor and air tool system relief
  • Pilot supply pressure regulation in control systems

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Our valve engineers can help you select the perfect valve for your application.

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Frequently Asked Questions

How do I size an air compressor relief valve?
Size based on compressor displacement (CFM), maximum discharge pressure, and inlet/outlet line sizes. A relief sized too small will cause system deadheading and excessive heating; too large and the compressor cycles constantly. Our sizing tool factors in inlet/outlet area ratios and discharge temperature to recommend the correct series and pressure setting.
Should I use a direct-acting or pilot-operated relief valve?
Direct-acting valves are simpler, lower-cost, and ideal for systems under 500 CFM. Pilot-operated designs provide better pressure stability and lower back pressure for larger systems or where tight control is critical. They’re also preferred for high-pressure gas applications above 1,000 PSIG.
What causes relief valve leak-by and how do I fix it?
Leak-by—sustained low flow despite normal operating pressure—usually indicates seat damage from dirt or moisture. Clean or replace the poppet seat. Use an adequate inlet strainer and maintain proper lubrication in compressor discharge. If leak-by persists, the valve may need service or replacement.
Can I use the same relief valve for different gases?
Generally yes, provided pressure and flow ratings are compatible. However, some gases (hydrogen, acetylene) require special consideration due to flammability. For safety and compliance, verify your gas type with our technical team before selecting a valve.
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