Armstrong developed the high-leverage series of air-relief traps especially for venting gases from low-specific- gravity fluids at high pressures. They use standard Armstrong forged steel bodies with very high leverage air-relief mechanisms. They are available with screwed, socketweld or flanged connections.


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 its normal value. Consult Armstrong Application Engineering for allowable working pressures.