Abbreviation
Explanation
NC
Normally Closed; direction of action spring-closing/air-opening
Nm
Unit of measurement of work [newton metre]
Unit of torque 1 Nm = 0.737 lbft
Pound-Force (lb) + Feet (ft)
NO
Normally Open; direction of action air-closing/spring-opening
OD
Outside diameter; short name for outside diameter for inch tubes
according to DIN 11866-C
PA
Pneumatic actuator
PTFE
Polytetrafluoroethylene
Material designation, short designation according to DIN/ISO 1629
SW
Width across flats; indicates the size of spanners
TEFASEP
®
Sealing material for the valve seat seal
T.VIS
Tuchenhagen valve information system
TV
Divisible valve disk; to valve seat seal system “divisible”
TIG
Tungsten inert gas welding
Appendix
430BAL011547EN_2
70
08.07.2019