Brass vacuum relief valve 0-30" Hg Vacuum Range 1/4" Male NPT

Brass Vacuum Relief Valve – Adjustable 0–30" Hg, 1/4" Male NPT

Compact, adjustable vacuum relief valve for protecting pumps, tools, and parts by limiting maximum vacuum. Turn the knurled adjustment screw to set the opening point anywhere from 0 to 30 inches of mercury (inHg), then lock the setting with the jam nut for repeatable results. Durable brass body with 1/4" male NPT inlet threads integrates easily into catch pots, manifolds, and vacuum panels.

Key Features

• Adjustable relief range: 0–30" Hg (vacuum)
• Connection: 1/4" male NPT (tapered pipe thread)
• Body material: brass
• Proportional action opens as vacuum rises to the set point
• Positive lock with jam nut for stable, repeatable settings

Typical Uses

• Protect vacuum pumps and gauges from over-vacuum
• Prevent excessive vacuum on molds, delicate parts, or test fixtures
• Stabilize process vacuum level in bagging/infusion systems

Installation & Notes

• Install on a suitable port of your manifold, catch pot, or panel using 1/4" FNPT.
• Use a compatible thread sealant/tape on NPT threads.
• With the system running, adjust the knurled screw to the desired limit and lock the jam nut.