Description

Metso Neles B1CU17/55 Double‑Acting Pneumatic Rotary Actuator

Technical Specifications

• Product Model: B1CU17/55
• Brand: Metso (Neles / Valmet)
• Warranty: One Year
• Input Voltage: Pneumatic instrument air supply, no electrical power required
• Operating Temperature: ‑55 °C ~ +70 °C (arctic‑grade sealing)ManualsLib
• Storage Temperature: ‑60 °C ~ +85 °C
• Response Time: 0.6‑2.5 s full 90° stroke, subject to air supply flow capacity
• Protection Class: IP66 / IP67, compliant with IEC 60529Valmet
• Accuracy Class: ±1° mechanical rotary stroke accuracy
• Output Frequency: Not applicable
• Rated Current: Not applicable (pneumatic operation)
• Actuator Type: Double‑acting piston‑style quarter‑turn actuator, stay‑put on air loss
• Rated Torque: B1C17 high‑torque rating; maximum working supply pressure 10 barManualsLib
• Supply Pressure: 4‑10 bar clean, dry instrument air
• Rotation Stroke: Standard 90‑degree quarter‑turn travel
• Mounting Interface: ISO 5211 compliant valve shaft mounting
• Housing Material: Cast iron main housing; hard‑anodized aluminum cylinder
• Sealing: Arctic‑spec low‑temperature seal compound for‑55 °C environmentManualsLib
• Humidity: 0‑100 % RH, suitable for outdoor field installation
• Weight: 78 kgManualsLib
• Dimensions: 785 × 555 × 310 mmManualsLib

Product Overview

The B1CU17/55 belongs to Metso Neles B1C‑series heavy‑duty double‑acting pneumatic rotary actuator family. The suffix “/55” represents arctic‑low‑temperature construction specially engineered for extreme cold‑climate field sites. It delivers high‑output rotary torque for large‑size quarter‑turn ball valves, butterfly valves and plug valves.

Double‑acting piston design holds valve position when instrument air supply is lost; no built‑in spring‑return fail‑safe function. Optimized seal formulation prevents seal hardening and brittleness under‑55 °C ambient conditions. Robust cast‑iron housing and high‑strength lever mechanism support long‑life cyclic operation. It can be assembled with Neles valve positioners, solenoid valves and ATEX‑certified limit‑switch boxes to realize modulating control or on‑off valve functions. Widely used for new‑build arctic‑region projects and spare‑part replacement for legacy valve automation systems.

Application Notes

‑ Instrument air must meet ISO 8573‑1 cleanliness and dryness requirements. ‑ The /55 arctic‑grade sealing kit shall not be interchanged with standard‑25 °C seal assemblies. ‑ Mount to quarter‑turn valves following ISO 5211 mounting standard. ‑ Deploy ATEX‑approved accessories for hazardous classified area installations. ‑ Periodic inspection and seal maintenance are required for high‑cycle service. ‑ Typical deployment: northern‑region oil‑gas pipelines, LNG facilities, arctic refineries, petrochemical plants for heavy‑duty quarter‑turn valve automation.