Features
Stainless Steel Construction
Stainless Steel springs
True Internal Design for Mobile Applications
Standard Spring Settings
Nitrile (NBR) Seat
Serial Numbers for Identification
 
Specifications: 
Connection Sizes and Style
2-inch MNPT
3-inch MNPT
3-inch CL300 RF Flange
 
Construction Materials
Stainless Steel, Brass
 
Maximum Inlet Pressure (Body Rating)
480 psig / 33,0 bar
 
Start to Discharge Pressure Range
100 to 400 psig / 6.9 to 27.5 bar
 
Temperature Capabilities
Nitrile (NBR): -40° to 180°F / -40° to 82°C
 
Approximate Weights
H722 Series: 2.75 Pounds / 1 kg
H732 Series: 7.5 Pounds / 3 kg
 
 
Primarily for trucks transporting LPG, Anhydrous Ammonia (NH3) or other compressed gases.
Type H722 stainless steel relief valves resist rust and corrosion, including a 300 Series stainless steel spring for additional resistance to product contaminants. A thickly molded main seal improves service life and resistance to severe applications. 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. Standard product temperature rating is -20 to 160°F / -29 to 71°C.
Tight fitting protective caps Type P297 are standard on the valve to ensure no debris blocks the valve discharge. Standard setpoints listed with UL® for the Type H722 include 125, 156, 250, 265, 275 and 312 psig / 8.6, 10.8, 17.2, 18.3, 19.0 and 21.5 bar.  All set points between 100 and 400 psig / 6.9 and 27.6 bar are available with ASME approvals.
A 1 1/2" hex size Type P304 wrench can be inserted into the valve socket when installing/removing the valve to provide a means of attaching a standard wrench.