Damcos BRC 012 A1 051-4252 Hydraulic Balanced Rotary Actuator

Damcos BRC 012 A1 Hydraulic Double-Acting Balanced Rotary Actuator (MPN: 051-4252)

The Damcos BRC 012 A1 (Part Number: 051-4252) is a double-acting balanced rotary actuator engineered specifically for quarter-turn marine and offshore valve automation. Designed on a patented balanced rotary principle utilizing dual opposed curved racks and a central pinion or helical spline design, the BRC series transmits pure symmetrical torque directly into the valve stem without introducing axial side loads, bending moments, or asymmetric radial stress.

Constructed in a heavy-duty ductile cast iron (GGG 40 / EN-GJS-400-15) housing with AISI 316 stainless steel trim options and marine-grade epoxy coatings, the BRC 012 A1 provides reliable 90° operation in submerged, open-deck, bilge, ballast tank, and engine room environments. It interfaces directly with modular direct-mounted cross-over valve blocks, position indicators (DPI/VPI), and emergency hand pumps, serving as a core component of Emerson / Danfoss Marine Valve Remote Control Systems (VRCS).

Model Details

• Manufacturer: Damcos (Emerson Process Management / Danfoss Fluid Power)
• Series: BRC (Balanced Rotary Compact)
• Model Code: BRC 012 A1
• Manufacturer Part Number (MPN): 051-4252
• Actuation Principle: Double-acting hydraulic, balanced dual-piston rotary drive
• Stroke / Angle of Rotation: 90° ± 1° (mechanically adjustable via external end stops)

Key Features

1. Zero-Side-Load Balanced Rotary Mechanics: Dual-opposed balanced drive equalizes all internal hydraulic and mechanical thrust forces, eliminating lateral side loading and extending valve gland packing and stem seal life.
2. High-Torque to Minimal-Footprint Ratio: Delivers continuous high break-away, intermediate, and seating torque across its entire 90° travel while maintaining a compact exterior envelope and minimal displacement volume.
3. 315 Bar Test / 675 Bar Burst Structural Integrity: Rated for nominal 135 bar working pressure with factory test proofing at 315 bar and burst limit test exceeding 675 bar for maximum offshore safety.
4. Universal 360° Omnidirectional Mounting: Operates with full specification in any orientation (horizontal, inverted, or vertical stem position) with modular ISO 5211 or specialized intermediate adaptors.
5. Submersible & Severe-Atmosphere Enclosure: Marine ductile iron casing (GGG 40) treated with zinc-phosphate primer (Hempel EE 13140) and alkyd topcoat suitable for continuous sea-water submersion or salt spray.

Technical Details:

Compatibility:

• Quarter-Turn Valve Compatibility: Marine butterfly valves (centric and eccentric disc), high-pressure ball valves, rotary plug valves, and ventilation dampers.
• Direct-Mount Control Modules:
  • Damcos Cross-Over Valve Blocks (enabling double-pipe to single-pipe emergency crossover).
  • Damcos CB (Counter Balance) and block-mounted safety check valves.
  • Damcos DPI-E / DPI-C mechanical-hydraulic continuous or open/close position indicators.
  • Emerson VPI (Valve Position Indicator) modules and inductive microswitch boxes.
• Valve Mechanical Mounting Patterns:
  • ISO 5211 / DIN 3337 flange bolt circles via Damcos intermediate adaptor flanges (F05, F07) with square, keyed cylindrical, or double-D valve stem sleeves.

Frequently Asked Questions

What is the maximum working pressure of the Damcos BRC 012 A1?

The standard continuous operating working pressure range is 30 to 135 bar (435 to 1958 psi). The unit is factory proof pressure tested to 315 bar, with a minimum burst pressure threshold of 675 bar.

How does a balanced rotary actuator differ from a conventional rack-and-pinion design?

Conventional rack-and-pinion actuators use a single piston rack pushing one side of a pinion gear, transferring significant lateral side-thrust to the pinion bearing and valve spindle. The Damcos BRC uses opposed balanced pressure forces that eliminate transverse loads, ensuring only pure rotational torque is transferred to the valve stem.

What hydraulic oil viscosity is recommended for Damcos BRC actuators?

Damcos recommends acid-free mineral hydraulic oil with an operating viscosity between 15 and 200 cSt. The fluid must be kept filtered to at least ISO 4406 cleanliness class 21/19/16 or better to prevent seal degradation.

Can the BRC 012 A1 051-4252 be installed submerged inside seawater or ballast tanks?

Yes. The BRC series is engineered specifically for submerged service in sea air, seawater, and ballast tanks. The nodular cast iron housing and specialized multi-layer coating system isolate mechanical components from corrosion.

How do I verify whether I have an NBR or Viton seal kit installed?

Standard operational units feature Nitrile (NBR) seals operating between -25°C and +80°C. For high-temperature cargo oil handling or steam tracing applications up to +120°C, a Viton (FKM) seal set is required and identifiable on technical inspection sheets or overhaul overhaul documentation.