The hard seats on these valves form a leak-tight seal to contain the pressure between the fixed and moving portions of the valve. Unlike soft seats, hard seats are integral to the body and allow a small amount of leakage.
Use these valves in most pneumatic systems to release excess air and prevent overpressurization.
Brass Body with Brass Seat
Stainless Steel Spring with Lead Seal
Stainless Steel Body with Stainless Steel Seat
Stainless Steel Spring with Steel Seal
These rugged valves are often used in compact systems, such as with intercoolers and aftercoolers.