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Dyna-Flo

Dyna-Flo · Control Valves

Ritec partner

Dyna-Flo DFC, DFO, DFN and DFR spring and diaphragm actuators

Pneumatic spring and diaphragm actuators for sliding stem (DFC, DFO, DFN) and rotary (DFR) control valves, fail-open or fail-closed, travel to 4", for −40 °C to +82 °C.

Spring and diaphragm actuators are the simplest way to move a control valve: instrument air on one side of a diaphragm, a spring on the other, so the valve goes to a defined position when the air fails. DFC actuators push the stem down (fail closed on a push-down-to-close valve), DFO pull it up (fail open), DFN is the high thrust version for larger valves, and DFR is the rotary counterpart for the 570 series.

They accept the standard 3–15 psi signal or a positioner output, and are supplied with handwheels, limit switches and positioners as required.

Selection data we need

Medium and its properties, inlet and outlet pressure, flow rate at minimum, normal and maximum conditions, temperature, allowable noise level, required shutoff class, pipe size and rating, actuator air supply and control signal, and any fail position. We size the valve and actuator in Dyna-Flo’s FloSpec software.

Applications

  • Dyna-Flo sliding stem valves 320 to 390 and DF2000
  • Dyna-Flo 570 and 570S rotary valves
  • Retrofit of existing control valves

Models: Control Valves

Dyna-Flo

Dyna-Flo 360 series sliding stem control valve

Standard pressure globe and angle control valve, 1/2" to 8", ASME Class 150 to 600, cage or top guided, shutoff Class II to VI. The general-purpose Dyna-Flo control valve.

Dyna-Flo

Dyna-Flo 390 series high pressure sliding stem control valve

High pressure globe and angle control valve, 1" to 8x6", ASME Class 900 to 1500, cage or top guided, shutoff Class II to V, with reduced port and severe service trim options.

Dyna-Flo

Dyna-Flo 320 series axial flow anti-cavitation control valve

Axial flow anti-cavitation sliding stem valve, 2" to 8", ASME Class 300 to 1500, linear, cage guided, shutoff Class V, for high pressure drop liquid service.