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Brass safety valve with 1/4 inch male threads, 200 PSI rating

Milton S-1090-200 1/4" MNPT ASME Safety Valve 200 PSI

SKU CH-YGZB-1PTBA

ASME-coded safety valve with 1/4" MNPT threads pops at 200 PSI and flows 170 CFM

  • 1/4" MNPT threads fit standard air lines
  • ASME certified 200 PSI pop-off protects equipment
  • Bubble-tight seal holds to 10% of set pressure
  • 170 CFM capacity handles high-flow compressors
  • Milton quality since 1943 for pneumatic systems

1/4" MNPT ASME Safety Valve

The Milton S-1090-200 is a 1/4" male national pipe thread safety valve rated at 200 PSI pop-off pressure. It provides automatic pressure relief for compressed air systems. The valve meets ASME standards and is manufactured in the USA. It suits industrial, automotive, agricultural and fleet maintenance applications.

Installers needing 200 PSI relief

This valve fits systems requiring a 200 pounds per square inch set point with 1/4" MNPT connections. It delivers 170 cubic feet per minute flow capacity and remains bubble tight to 10% of pop-off pressure. Buyers needing a different pressure setting or thread size should select another model. Those requiring electronic controls or adjustable relief will not find those features here.

Sustained over-pressure behaviour

Under continuous over-pressure the valve opens at the 200 PSI threshold and vents air at the rated flow until system pressure drops below the reseat point. The bubble-tight seal holds up to 10% below the set pressure to prevent leakage during normal cycling. The all-metal construction withstands repeated actuation without degradation. The design has been in production since 1943 with over 1400 SKUs in the range.

Highlights

  • 1/4" MNPT threads fit standard air lines
  • ASME certified 200 PSI pop-off protects equipment
  • Bubble-tight seal holds to 10% of set pressure
  • 170 CFM capacity handles high-flow compressors
  • Milton quality since 1943 for pneumatic systems

Specifications

BrandMilton

Questions about this item

What thread size must my tank or manifold have to accept the 1/4" MNPT connection?

The valve has 1/4" male national pipe threads, so the mating port must be a 1/4" female NPT fitting.

Will the 200 PSI pop-off pressure protect a system rated below that level?

The valve opens at 200 PSI and reseats within 10% of that pressure, so downstream components should be rated for at least 200 PSI.

How can I verify the valve is flowing its rated capacity after installation?

At full pop-off the valve passes 170 cubic feet per minute; measure flow during a test release to confirm performance.

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