Tyco - Anderson Greenwood & Varec Pressure Relief Valves
Series 400 Modulating Action
PORV - Pilot operated relief valve
Soft seat design
Metal-to-metal seat design
Bubble-tight seats near set pressure
Pop action available
Modulation action available
Field test connection
Balanced design
Externally adjustable blowdown
Patented, piston wedge ring
Full lift at set pressure
Replaceable soft seats and seals
Series 2010B/2020B
For use on atmospheric and low pressure storage tanks
2010B vents to atmosphere
2020B allows vapors to be piped away for recovery or destruction
Oversized pressure and vacuum ports for maximum flow capacity
Removable hood and cover
Interchangeable and field replaceable seat rings
Protective screens at ports prevent entrance of foreign matter
Series 80 Direct Spring Operated 
Soft seat design as standard
Leak-tight performance near set pressure
Replaceable soft seat and seals
External adjustable blowdown on types 81, 83, 86
Full lift at set pressure on types 81, 83, 86
Balanced spindle design on type 81P
Meets ASME Section VIII requirements
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