Single-Acting Spring Diaphragm Actuators (DSA)

Surface Actuation

The DSA-Series single-acting spring diaphragm actuators by Master Flo are engineered for robust, long-lasting performance. These actuators feature a generous diaphragm area, allowing operation at low pneumatic pressures, while an opposing spring ensures fail-closed (standard) or optional fail-open action. You can mount various positioners and instruments directly to the actuator for added flexibility.

Tailored Performance for Your Needs

Choose from 4 diaphragm sizes and a range of springs to meet your specific thrust requirements. Additional options such as manual handwheel overrides, adjustable travel stops, and special materials are available to tailor the actuator to your exact needs. Plus, positioners can be selected to meet various hazardous-area certification requirements.

Key Features:

Reliability: Rugged construction with minimal moving parts ensures a long service life with minimal maintenance.
Interchangeability: Actuator yokes incorporate standard industry mounting bosses, allowing for universal interchangeability.
Protective Coatings: External surfaces are powder coated for maximum protection against harsh environments, and special coatings like offshore epoxy are also available.
Instrument Mounting: Kits are available with mounting options for most commercial positioners, promoting field standardization.

Operating Medium

Instrument air
sweet instrument gas also available

Fail Action

Spring Fail Close
Spring Fail Open
Fail Last

Control Signal (positioner dependent)

4–20 mA
HART
Fieldbus
Profibus

Feedback Signal (positioner dependent)

4–20 mA
HART
Fieldbus
Profibus

Maximum Supply Pressure

DSA069: 70 psig (4.8 barg)
DSA105: 65 psig (4.5 barg)
DSA156: 55 psig (3.8 barg)
DSA220 & DSA2204: 50 psig (3.4 barg)

Diaphragm Area (in² / cm²)

DSA069: 69 / 445
DSA105: 105 / 677
DSA156: 156 / 1006
DSA220 & DSA2204: 220 / 1419

Hazardous Area Certification (positioner dependent)

CSA/FM/UL: Explosion Proof or Intrinsically Safe
ATEX/IEC: Intrinsically Safe or Flameproof

Operating Pressure

3–15 psig (0.2–1.0 barg)
6–30 psig (0.4–2.0 barg)

Operating Temperature

Standard: -40 to 180 F (-40 to 82 C)

Get Started

Quote Request Form

Company

Name

City

State

Country

Fail Action

Control Signal

Feedback Signal

Diaphragm Area (square inches / square centimetres)

Operating Pressure

Operating Medium

Hazardous Area Certification

Details

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