Two way plug valve with safety stuffingbox packing, special design for HF alkylation

ASME: NPS ½“ – 8“ / class 150 / 300
PT range: -30 < T < 230/280°C, vacuum 10-8 mbar

Spec Sheet
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Design Features

Design Characteristics

  • free of cavities
  • maintenance free – self lubricating
  • easy accessible adjustment of the plug, even with mounted actuator
  • vacuum tight
  • fugitive emmission resp. clean air act certified (TA – Luft 2002 approval)
  • PED 97/23/EG
  • fire safe design API 607 / ISO 10497
  • special design for hydrofluoric acid (HF alkylation):
    – monel body, plug and cover
    – Flanges and cover seat painted with special acid  detection paint (yellow or orange)
    – plug with relief hole
    – Cover sealing with stuffingbox packing type “FSN”
    – X-ray examination on critical areas



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 material
• Monel, ASTM A494 M35.1

Standard plug material
• Monel, ASTM A494 M35.1

Sealing Systems

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

Type FSN

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Plug Forms





For geometric reasons, threads are used in the flange bores in a few cases



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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
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3 Actuators
Actuators for mounting-flange acc. to DIN ISO 5211
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NEW: Pneumatic actuator AIR GEAR for plug valves with high torque =150.000 Nm
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4 Ratched coupling
To usw on multiport valves with standard 90° actuator for bigger switchpositions than 90°
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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
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