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TA798 Ultra High Flow Relief Valve


The TA798 high-flow vacuum relief valve is designed to offer the maximum air flow possible for a 4-inch diameter valve. It achieves this flow with its unique design that utilizes powerful rare earth magnets instead of the compression springs found on a conventional breather valve. The magnets allow the valve to open quickly and completely once the initial opening resistance is overcome.

The TA798 can be used in any application where rapid, high volume, air intake is required.

Each valve is shipped preconfigured, requires no field maintenance, and is supplied complete with a nut, washer, and gasket. Additionally, the TA798 may be configured with a manual release button, which is used to equalize vacuum differentials in order to make opening the container easier.

The chart below shows the typical flow performance for the TA798 high-flow vacuum relief valve. The dashed lines show varying cracking (opening) points.

TA798 High-Flow Pressure Relief Valve Typical Flow versus Pressure Graph

As shown in the chart above, various cracking pressures are available for the TA798 valve. The reseal pressure of the valve, however, is not selectable due to the valve's high volume of air flow. In many cases, the valve will completely equalize the pressure inside an enclosure with its surrounding atmosphere before the valve closes.

Materials Housing, Cover, Washer & Nut - Aluminum Alloy • Cover Screws - Stainless Steel
Materials (Cont.) Float & Magnet Support - Glass Filled Polycarbonate • Magnets - Nickel Plated Neodymium Iron Boron
Materials (Cont.) Return Spring - Phosphor Bronze • Gasket and Internal Seal - Silicone
Finish Anodize
Mounting Hole Diameter 4.550 ± .04 (103 ± 1 mm)
Maximum Wall Thickness 0.50 (13 mm)
Torque Value for Nut 150 in-lbs (17 N•m)
Weight TA798-V - 2.778 lbs. (1260 grams) • TA798-VR - 2.910 lbs. (1320 grams)

TA798-VR Only:

Manual Release Button Anodized Aluminum Alloy
Lockout Pin & Lockout Pin Retaining Cable: Stainless Steel

Housing and nut have hook spanner notches. Use a 3-inch hook spanner wrench for the nut and a 3.25-inch hook spanner wrench for the housing.
Available in cracking ranges 0.1 - 1.5 psid.

TA798-V Drawing

TA798 High-Flow Pressure Relief Valve Drawing

TA798-VR Drawing

TA798-VR High-Flow Pressure Relief Valve Drawing

Additional information


Housing, Cover, Washer & Nut-Aluminum Alloy, Cover Screws-Stainless Steel, Float & Magnet Support-Glass Filled Polycarbonate, Magnets-Nickel Plated Neodymium Iron Boron, Return Spring-Phosphor Bronze, Gasket & Internal Seal-Silicone



Mounting Hole Diameter

4.550 ± .04 (103 ± 1 mm)

Maximum Wall Thickness

0.50 in. (13 mm)

Torque Value for Nut

150 in-lbs (17 N•m)


TA798-V-2.778 lbs. (1260 grams), TA798-VR-2.910 lbs. (1320 grams)

Operating Temperature

-80°F to +160°F (-62°C to +71°C)

AGM Container Controls, Inc.
3526 E. Fort Lowell Rd.
Tucson, AZ 85716

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