AZ Armaturen Sealing Systems
Cover and stem sealing systems
suitable for general applications
Type STANDARD
Standard sealing suitable for general applications
plug adjustment
thrust collar
cover sealing (PTFE)
stainless steel diaphragm
Secondary sealing: V-diaphragm (PTFE), delta thrust collar (PTFE)
Primary sealing: sleeve*
Type FS2 Fire-Safe-Sealing (API 607)
with additional graphite packing
TA Luft / ISO 15848-1 certified
Class BH, SSA0 – No readjustment of the seal required!
plug & packing adjustment
Tertiary sealing: Packing to atmosphere (graphite)
thrust collar
cover sealing (graphite)
stainless steel diaphragm
Secondary sealing: V-diaphragm (PTFE) and delta thrust collar (PTFE)
Primary sealing: sleeve*
Type CA2 Chemistry sealing
with additional PTFE packing
TA Luft / ISO 15848-1 certified
Class BH, SSA0 –No readjustment of the seal required!
plug & packing adjustment
Tertiary sealing: Packing to atmosphere (PTFE)
thrust collar
cover sealing (graphite)
stainless steel diaphragm
Secondary sealing: V-diaphragm (PTFE) and delta thrust collar (PTFE)
Primary sealing: sleeve*
*) The sleeve material has a decisive influence on the maximum operating temperature; Material selection acc. to PT-diagram
More safety
for severe applications
Typ FSN Fire-Safe-Sealing (API 607)
with safety seal for use at alternating temperatures
plug adjustment
triple safety stem packing adjustment
Tertiary sealing: triple safety stem packing (graphite)
cover sealing (graphite)
Secondary sealing: V-diaphragm (PTFE) and delta thrust collar (PTFE)
Primary sealing: sleeve*
Material for type CASN and CASN-SL chemistry safety sealing: packing and cover sealing in PTFE
plug adjustment
triple safety stem packing adjustment
Quaternary sealing: three o-rings at the stem
Tertiary sealing: triple safety stem packing
Secondary sealing: V-diaphragm (PTFE) and delta thrust collar (PTFE)
cover sealing (graphite)
Primary sealing: sleeve*
Type FSN-SL Fire-Safe-Sealing (API 607)
with automatic adjustment of the packing by means of disk springs
plug adjustment
o-rings protect the springs against corrosion
disk springs (optionally made of Inconel)
Tertiary sealing: triple safety stem packing (graphite)
Secondary sealing: V-diaphragm (PTFE) and delta thrust collar (PTFE)
cover sealing (graphite)
Primary sealing: sleeve*
Material for type CASN and CASN-SL chemistry safety sealing: packing and cover sealing in PTFE
*) The sleeve material has a decisive influence on the maximum operating temperature; Material selection acc. to PT-diagram
Sealing systems
for lined plug valves
Type CA Chemistry sealing
with additional PTFE packing
plug & packing adjustment
Tertiary sealing: Packing to atmosphere (PTFE)
thrust collar
Secondary sealing: V-diaphragm & delta thrust collar (PTFE)
stainless steel diaphragm
Primary sealing: lined body
Type SAFE-LINED Chemistry sealing
for use at alternating temperatures
plug adjustment
triple safety stem packing adjustment
Tertiary sealing: triple safety stem packing (PTFE) to atmosphere
lined cover
Secondary sealing: V-diaphragm (PTFE), delta thrust collar (PTFE)
Primary sealing: lined body*
Typ SAFE-LINED-SL Chemistry-Safety Sealing
with automatic adjustment of the packing by means of disk springs
plug adjustment
triple safety stem packing adjustment
disk springs (optionally made of Inconel), o-rings protect the springs against corrosion
Tertiary sealing: triple safety stem packing (PTFE) to atmosphere
Secondary sealing: V-diaphragm (PTFE), delta thrust collar (PTFE)
lined cover
Primary sealing: lined body*
*) Lining and plug material have a decisive influence on the maximum operating temperature; Material selection according to PT-diagram.
Special sealing systems
Chevron packing
- increases the contact pressure (when pressure builds up on the safety stem packing towards plug stem)
- for toxic and fugitive media
- high wear resistance
Type CL Chlorine / gas applications
- approved for chlorine applications and other toxic gases
- ideal for media with changing state of aggregate (e.g. liquid to gas, vice versa)
- vacuum capable
Detection ports for monitoring purpose of lethal gases (phosgene, etc.)
- detection ports for early recognition of potential leakages
- sniffing at sealing surfaces to atmosphere
stem packing
cover sealing
flange sealing