Features

• Lightweight aluminum construction is resistant to environmental and internal corrosion.
• Repetitively consistent opening pressure.
• Smooth relief action.
• Positive reseating with minimal pressure drop.
• Soft seat option provides repeatable leak-tight performance; allows reduced maintenance costs, multiple cycles with tight shut-off and high seating integrity (Models 330, 330S and 333S).
• Model 230 (non-code) is direct spring-loaded design with synthetic disc insert.
• Model 330 series’ differential mechanism maintains a predetermined seat contact load.
• Full spring load is never imparted to synthetic disc insert (Models 330, 330S and 333S).
• Seat tightness increases as inlet pressure approaches set (opening) pressure.
• Each valve tested and inspected for pressure setting and leakage.