• The guide is held in place using the method employed by all the leading high-pressure safety valve manufacturers, thus eliminating the age-old industry problem of the guide-to-body threads corroding in service, which can require major repairs.
• The HL valve has a full nozzle that threads into the body, making it easy to remove and less expensive to repair should it be damaged in service. The full nozzle is designed with spanner wrench slots for easy removal and installation.
• An external blowdown adjustment makes final minor blowdown adjustments in the field very easy and minimizes the testing time.
• The HL’s Flexi-Disc®, which is more common in high pressure safety valves, offers improved seat tightness.
• The special designed cover and overlap collar form a unique back pressure chamber for improved blowdown and prevents steam from heating the spring, which might affect set pressure.
• The built-in mechanical lift stop prevents overlift and ensures stability during the relieving cycle.

Sizes: 1-1/4" x 1-1/2" to 6" x 8"
Orifices: 0.339 to 12.174 in2 [2.187 to 78.54 cm2]
Inlet Ratings: ANSI Class 300 and 600
Maximum Temperature: 1000°F [538°C]
Maximum Set Pressure: 725 psig [50 barg]
Code: ASME I and VIII