30 Series Free-Floating Lever Air/Gas Vents—Forged Steel

For pressures to 1,000 psig (69 bar) or specific gravity down to 0.40

32-AV, 33-AV and 36-AV are forged steel vents using the same proven
free-floating lever mechanisms used in Armstrong steam traps. They are
ideal for applications where high air/gas venting capacity is required,
up to 1,000 psi (69 bar). They are available with screwed, sockeweld or
flanged connections.

High-temperature service

Maximum allowable working pressures of floats decrease at temperatures above 100°F (38°C). Allow for approximately:

• 10% decrease at 200°F (93°C)
• 15% decrease at 300°F (147°C)
• 20% decrease at 400°F (204°C)

The float is not always the limiting factor,
however. Consult with the Armstrong Application Engineering Department
if you have a high-temperature application that also requires maximum
operating pressure.

Sour gas service

Forged steel and stainless steel traps can be
modified to resist hydrogen sulfide stress corrosion. These
modifications involve annealing the float, which will reduce the maximum
working pressure of the float to about half of its normal value.
Consult Armstrong Application Engineering for allowable working
pressures.