Series A is a wafer type butterfly valve with a one piece body and soft seat meant for automatic on/ off and control applications. It is particularly well suited for the gas industry, PSA (Pressure Swing adsorption) plants where fast stroking and high cycling combined with long lasting tightness is a standard requirement. Full rating from PN40 and PN63 (ASME PN 300, 600) makes the series A valve a sound control or shut-off valve and a reliable choice.

Excellent on-off capabilities

• Uniquely functioning soft seat design assures tightness over long time periods.
• Contact between disc and seat is mechanically induced and does not rely on assistance from differential pressure.
• Bi-directional long term tightness is maintained even in high cycle application services and the tightness is not affected by large thermal cycling either.
• Low friction and excellent wear resistance.
• Lowered operational torque reduces actuator size
• Heavy-duty stem and bearings arrangement extends service life and is insensitive to thermal cycles and impurities.
• Clear marking of the disc position

Low cost of ownership

• Extremely high life cycle minimizes the need for maintenance, and increases Mean Time Between Failure (MTBF).
• Interchangeable seat can be replaced without disassembling the disc and shaft. Seat replacement does not require any adjustment or special tools.

Increased safety and minimized emissions

• Field proven single piece seat design guarantees a reliable operation during the whole life time
• Double packing to minimize the emissions
• Double bearing construction for both the drive shaft and the bottom shaft to minimize the bearing load and extend the life time
• Anti-blow out shaft construction standard in all valves
• ATEX

Reliable long term operation

• Eccentric Disc: No seat/disc contact in the open or intermediate position
• Eliminates wear points at top and bottom of seats for higher life cycle\
• Reduced torque requirements, allowing for smaller actuator
• Actuator designed for high cycling operations
• Two piece shaft to maximize the capacity

Easy Maintenance

• Simply remove body insert and replace seat – disassembly of disc and shaft is not required
  Modular design of bearing cartridge enables easy
  maintenance without disassembling the valve

Materials suitable for a broad range of applications

Standard body materials: Carbon steel (plates ASME A516 Gr. 60/70 and DIN/EN 1.0566 castings ASME A352LCC and DIN/EN 1.6220