Technical Specifications Parameter Specification Model 299HS Type Pilot-Operated Safety Relief Valve Operation Pop-action, full lift Orifice Designation Various sizes available (e.g., P, Q, R per API 526) Set Pressure Range 50-600 psig (3.4-41.4 bar) - depending on specific configuration Maximum Inlet Pressure 600 psig (41.4 bar) or higher based on design Blowdown Adjustable (typically 2-7%) Temperature Range -20°F to 1000°F (-29°C to 538°C) - depending on materials Body Materials Carbon Steel (WCB) standard, with Stainless Steel and other alloys available End Connections Flanged (ANSI Class 150-600) Pilot System Diaphragm-operated with stainless steel components