Control plugs with equal-percentage or linear control characteristic
Flexible
- 11 standard control plugs per size in stock
- easy exchangeability of control plugs in case of process modification
- free passage possible with open valve
Equal percentage
- plug form PR setting ratio up to 1:400
- plug form EXTRA setting ratio up to 1:1000
Linear
- plug form LR setting ratio up to 1:300
Technical comparison:
AZ control plug valve vs globe valve / segmented ball valve
AZ control plug valve
- cavity-free
- adjustable
- space-/weight-saving
- automation with standard quarter turn actuator
Seat tightness
- leakage class 6 acc. to ANSI FCI 70.2
- double in-line sealing
Sealing to atmosphere
- primary sealing already on the plug / sleeve
- multiple sealing systems
Globe valve
- cavities
- not adjustable
- actuator acc. to manufacturer‘s standard, no compatibility with other valves
- additional space requiered
Seat tightness
- leakage class 4 acc. to ANSI FCI 70.2
Sealing to atmosphere
- full pressure on the stem packing
- sealing only on the shaft
- linear actuation pulls medium into the packing
Segmented control ball valve
- cavities
- not adjustable
- automation with standard quarter turn actuator
Seat tightness
- leakage class 4 acc. to ANSI FCI 70.2
Sealing to atmosphere
- full pressure on the stem packing
- sealing only on the shaft
- additional sealing area due to bolted bottom cover (leakage risk!)
Corrosive, crystallizing and polymerizing media
AZ control plug valve
- sleeve encloses and protects the whole control plug
- no clogging under crystallizing and polymerizing media
Globe valve
- valve seat completely and permanently exposed to aggressive media
- deposits in the cavities
Segmented control ball valve
- segmented ball completely and permanently exposed to aggressive media
cavities!
cavities!
