Nuclear Grade Plug Valves – High-Pressure Solutions for Critical Applications

High-pressure plug valve for nuclear facilities

DIN: 15 – 250 / PN 10 – 160
ASME: NPS ½“ – 8“ / class 150 – 900
PT range: -30 < T < 230/280°C, vacuum 10-8 mbar

Design Features

Design Characteristics

  • high-pressure design
  • replacement of sleeve of installed valve
  • free of cavities
  • maintenance free – self lubricating
  • adjustable safety spindle packing
  • firesafe – API 607 / ISO 10497 (outside)
  • nuclear approval
  • forged steel
  • complete chain of documentation for all parts

Operating temperatures < -30°C and > 220 °C have to be checked and approved by AZ according to the operating conditions.

Besides the P/T value of the sleeve the limitations of the valve bodies also have to be considered. Please refer to the EN 12516-1 resp. ASME B16.34 in order to choose a proper pressure rating (PN/class). The shown values refer to austenitic stainless steel 1.4408 (A351 Gr. CF8M).

1) For operating temperatures below -10°C low temperature / austenitic steels are required.
2) Sleeve: There are different sleeve materials / compounds available.


Standard body materials

  • forged steel 1.4301, ASTM A240/A182

Standard plug materials

  • forged steel 1.4301, ASTM A240/A182 (304)
  • forged steel 1.4541, ASTM A240/A182 (321)

other materials on request

Sealing Systems

Type FSN

Firesafe safety sealing (API 607) for fluctuating temperatures
with 3x graphite packing (adjustable) for additional
stem sealing; Tmax 280°C

Port Forms

1 Locking Devices
Pilot valve combinations, pad lock eyelets, linear key conception, indexing plunger arrestor.

2 Plug stem extension
Solid construction in stainless steel with T-wrench, Standard extension 100 mm or 150 mm, non standard lengths are available on request

3 Actuators
Actuators for mounting-flange acc. to DIN ISO 5211

NEW: Pneumatic actuator AIR GEAR for plug valves with high torque =150.000 Nm

4 Ratched coupling
To usw on multiport valves with standard 90° actuator for bigger switchpositions than 90°

5 Cover extension
Solid construction in stainless steel, Standard extension 100 mm or 150 mm high,  non standard lengths are available on request . Hexagonal bolts on adjustment ring freely accessible. Note: Don’t use with sealing FSN/FSN-SL and CASN/CASN-SL