Nor-Cal Products' poppet valves are fully opening for high conductance and to prevent bellows contamination while the valve is in the open position, reducing particle contamination when the valve is cycled. Our poppet valves are available in most port configurations with CF, NW, ISO or ASA flanges. Valves through 3 inches (76mm) OD’s are available with manual or pneumatic actuators and Viton or copper bonnet seals. Valves over 3 inches (76mm) are available with pneumatic actuators only. Custom port lengths, flange configurations, and bellowless valves are also available. Bodies are die-formed from 304 stainless steel to eliminate sharp inside corners and improve conductance. Valves are electropolished for faster pump down, lower outgassing, and better corrosion resistance. Welded bellows are made from AM-350 stainless steel to provide corrosion resistance and excellent flexibility. The bellows fully retract from the side port when the valve is open, eliminating the buildup of by-products on the bellows and subsequent particle generation during operation. They are designed with additional segments to provide extended life. They can be operated in any position and actuators can be removed quickly for routine inspection without disassembling the system.