Small flange valve, open type, made of nickel-plated aluminium.

• Prevents positive pressure rises over the maximum permissible level
• Protects the pump against overload
• Leak rate 10^-2 mbar L/s
• Opening pressure 1100 mbar (abs.) or 100 mbar (overpressure)
• Polyamide valve body, Perbunan seals
• Stainless steel compression springs
• PTFE-coated aluminium sealing plate