Quarter-turn electric devices serve 90° valves — ball valves, butterfly valves and dampers — completing the other half of the TET portfolio; pneumatic and manual device groups round out a full "electric + pneumatic + manual" offering.
IQT series quarter-turn intelligent devices (image source: TET official website)
| Series | Positioning | Forms |
|---|---|---|
| QT | Self-developed compact quarter-turn | QT, QT0, QT.IN, QT.Ex, QT.Ex.IN, QT4/JS, QT4.IN/JS, QT4Ex/JS, QT4Ex.IN/JS (JS = speed-adjustable variant) |
| QB | Quarter-turn (QBR/NQB variants) | QB, NQB, QBR with .IN/.Ex/.Ex.IN forms |
| IQT1-4 | Non-intrusive intelligent (small-torque group) | IQT1-4, IQT1-4.Ex |
| IQT5-7 | Non-intrusive intelligent (large-torque group) | IQT5-7, IQT5-7.Ex |
| QAT | Quarter-turn extension | QAT series |
QT compact quarter-turn device (image source: TET official website)
QB/QBR series (image source: TET official website)
Two pneumatic series — GT and QZ — drive ball and butterfly valves on compressed air, complementing the electric line: on power loss, pneumatic actuators with hold-in-position or spring schemes are the standard safety-interlock practice (see our article on valve positions after loss of power or air).
