Flush Mounted Internal Relief Valves
Primarily for trucks transporting LP-Gas, NH or other compressed
gases. Types H722 and H732 stainless steel (316/CF8M) relief
valves resist rust and corrosion. Stainless steel makes it easy to
remove the valve from the tank for periodic testing (as prescribed
by DOT), and permits standard tank couplings instead of the more
costly flanged tank openings. Field-Repairable valve seats allow
for seat replacement without affecting relief set point.
Tight fitting protective caps (P297 and P298) are standard on the
valve to ensure no debris blocks the valve discharge. Standard set
points listed with UL and approved by ASME include 125, 156, 250,
265, 275, and 312 psig (8,6, 10,8, 17,2, 18,3, 19,0, and 21,5 bar).
Special setpoints are available from 100 to 400 psig (6,9 to 27,6 bar)
with ASME approvals. The flow area is 1.39 sq. in. for the H722 and
3.20 sq. in. for the H732.
A 1 1/2 and 2 1/2 hex size (Type P304 or P305) wrench can be
inserted into the valve socket when installing/removing the valve
to provide a means of attaching a standard wrench.