Pietro Fiorentini 919 Reflux Control

Technical Brochure

Operation & Installation Manual


The Reflux 919 Control is a pneumatic control valve, specifically designed for use with  normal gas, commonly operated by a direct-acting type diaphragm actuator (mod. 200) or reverse acting type diaphragm actuator (mod. 300).


The control loop is 6-30 psig: other signals available on application
The absolute tight shut off is obtained by soft-seated patented Fiorentini design
•    Very high rangeability due to special plug guiding (1:500)
•    The actuator design has a special balanced valve plug for minimum actuator requirements
•    Maximum inlet pressure 85 bar
•    maximum pressure drop 83 bar
•    Nace MR 01/75 version available on request
•    Retrofitting capability by built-in special silencer and Fiorentini patented channel flow trim.


Pneumatic actuated control valve Pzul: up to 99,6 bar
Rangeability: 500:1
Sizes (DN): 1″-2″-3″-4″-6″-8″-10″
Flanges: ANSI 150/300/600 RF or RTJ
Options: direct-acting, reverse action; built-in silencer; pneumatic positioner, electropneu-matic positioner.
Built-in silencer.
Options: gas flow control application, liquid flow control application.


Sizes (DN): 1″-2″-3″-4″-6″-8″
Flanges: ANSI 150/300/600 RF or RTJ, PN 16 UNI/DIN
Options: built-in silencer.