This device by nominal size from DN15 to DN150 and nominal pressure from
PN16 to PN40 is usable for controlling the flow rate of fluids in
professional and industrial plants and projects for steam and liquids in
the working temperature range -10…350˚C.
control valve cans control the flow rate by compressed air force and diaphragmatic actuator. This valve cans be opened or closed in normal condition that this is possible by movement the springs in the actuator. The actuator of this valve by different compressor air pressure and in gradually by changing the pressure of actuator's air , moves the shaft in the middle of actuator and change the distance between the seat and plug and accordingly the flow rate of the fluid is controllable by this way.
The pressure of the actuator air can control by regulator or I to P convertors via 4…20mA current.
This valve has two below operations:
1- Normal close actuator (Fail close): When the compressed air power is
disconnected , the valve is normal close.
2- Normal open actuator (Fail open): When the compressed air power is
disconnected , the valve is normal open.
The KV is dependent on valve curse. This dependence in most of the time
is linear and in some case is percentage. In first case the KV rate
changes with curse changes linear and in second case changes percently
If the fluid is hot oil or corrosive materials for
plug steam sealing , bellows seal mechanism is used instead of packing.
Installation: This valve is suitable for install in horizontal pipelines.
The valve actuator suspend downwards in installation.
The direction of fluid must be correspond with the
arrow on the valve body.
1- I to P positioner: Used for control the valve flow
rate by 4…20mA current.
2- Compressed air reduction regulator: Used for
setting the pressure rate of compressed air according to
3- Limit switch: Used for get switching from valve
Note: If you need ON-OFF pneumatic valve , you can
use without I to P positioner according to
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