Type 405 Ball Type Back Pressure or Relief Valves are ideal for use on low or medium pressures because of their large capacity, close regulation, and tight closing features. They are adapted to steam, water, air or similar fluids at pressures between 10 and 75 psi and are made in sizes up to 2112 inches, inclusive. The improved and rugged construction of these valves, combined with careful workmanship and best materials, insure years of trouble-free service. The bodies are heavy steam bronze in sizes below 2 inches.
All sizes have stainless steel seats and stainless steel balls.
The springs are steel, cadmium plated. The bracket screws into the body in sizes below 2 inches and is bolted to the body in the larger sizes. This is stronger and more rigid than the usual construction where the bracket is mounted on the stuffing box. The valve will operate in any position. They are compressed to working length when installed in the bracket.