Description

Part-turn Intelligent Actuator Overview

Part-turn intelligent actuator systems represent the backbone of modern industrial valve automation. The BJ/BJM05-IIC Series from Bonray (a specialized factory with over a decade of innovation in motion control) delivers a rugged, high-efficiency solution for quarter-turn valves such as butterfly valves, ball valves, and dampers.

Unlike traditional worm-gear actuators, this part-turn intelligent actuator employs a patented planetary gear transmission. Our factory designed this mechanism to eliminate the manual/electric shift lever, a common failure point in competitor models. The result: a 50% increase in mechanical efficiency, double the service life, and true bi-directional self-locking. You get a compact, high-torque device (50 N.m to 3000 N.m) that operates reliably in extreme conditions, from dust-laden cement plants to explosive gas environments (Ex db IIC T4 Gb).

This part-turn intelligent actuator integrates absolute encoding sensors for position and torque, removing the need for backup batteries. The factory equips each unit with a non-intrusive, infrared-setup interface. Operators adjust parameters without opening the electrical cover, maintaining IP68 protection even during commissioning. Whether you need Profibus-DP, Modbus, or a simple 4-20mA analog control, this actuator adapts to your DCS system. Our manufacturing facility in Jiangsu, China, follows strict ISO5211:2017 standards, ensuring direct mounting to any standard valve flange.

Part-turn Intelligent Actuator Features

1. Patented Planetary Gear Transmission

• The factory eliminates the unreliable manual/auto shift mechanism.

• Mechanical efficiency improves by over 50% compared to worm-gear units.

• The mechanism self-locks at any speed, preventing reverse rotation when power cuts off.

  

2. Non-Intrusive, Full-Command Setup

• Magnetic Hall sensors allow operation through the sealed cover.

• You adjust limits, torque, and control logic using an infrared setting tool or local knobs.

• No need to open the terminal box, so moisture and dust never reach the electronics.

3. Dual Absolute Encoding Sensors

• The part-turn intelligent actuator uses a proprietary BM12 single-turn absolute position sensor.

• The factory integrates an absolute torque sensor that directly measures output torque.

• Both sensors operate non-contactly, so they ignore temperature swings and voltage fluctuations.

• The system retains valve position forever, even during long power outages, without batteries.

4. IP68 Dual-Seal Enclosure

• O-rings at static joints and oil seals at dynamic joints provide double protection.

• The factory tests each unit for submersion at 2 meters for 48 hours.

• A second seal protects the terminal area during field wiring.

5. Multiple Control Modes

• Field control: Local knob or IR setter with “jog” or “hold” behavior.

• Remote digital: Profibus-DP, Modbus, Devicenet, FF, Hart.

• Remote analog: 4-20mA for precise positioning.

• Two-wire control: “Signal open, no-signal close” or reverse.

• ESD override: High or low-active signal bypasses all other commands.

6. Comprehensive Protection

• Automatic phase correction (no need to swap power wires).

• Instant reverse delay to protect the gear train.

• Phase loss and motor overheat protection (thermostat embedded in windings).

• Torque trip with a temporary 0.2-0.3 second override to unstick a jammed valve.

7. Dual-Stable-State Output Contacts

• You configure S1-S4 contacts to indicate any status (limit, torque trip, running, mid-position).

• Contacts retain their state after a power failure – no lost alarms.

Model and Type

The factory organizes the part-turn intelligent actuator series into three performance tiers to match your duty cycle.

1. BJ05-IIC On-Off Type (Switch Type)

• Suitable for infrequent operation: up to 60 starts per hour.

• Maximum continuous running time: 10 minutes.

• Duty cycle: 33.3%.

• No proportional control. Ideal for basic open/close applications like isolation valves.

2. BJ05-IIC Intermittent Modulating Type

• Also supports proportional control (4-20mA positioning).

• Up to 60 starts per hour (600 starts for three-phase models).

• Duty cycle: 33.3%. Perfect for regulating valves in tank level control or simple flow loops.

3. BJM05-IIC Frequent Modulating Type

• The factory equips this variant with solid-state relays (no mechanical contact wear).

• Up to 1200 starts per hour (600 for single-phase).

• Duty cycle: 50%. Higher positioning accuracy.

• Designed for demanding closed-loop control in chemical injection, dosing, or HVAC systems.

Factory custom options: You can order flameproof (Ex db IIC T4 Gb), dust explosion-proof (Ex tb IIIC T130°C Db), or a split-body version (BJM-IICF). The split design places the control unit up to 10 meters away from the actuator, ideal for high-temperature or high-vibration zones.

Specifications

Related product

BJM-IICF Split-Body Part-Turn Intelligent Actuator

• The factory separates the controller from the actuator body for remote mounting.

• Standard 10-meter control cable (extendable on request).

• You keep all functions: absolute encoding, non-intrusive setup, and bus communication.

• Ideal for ambients above 70°C or heavy vibration (e.g., engine rooms, kiln hoods, offshore platforms).

How do I set torque limits without opening the cover?

Use the infrared setting tool or the local knobs. The LCD menu (in English, Chinese, or other languages) guides you to set torque trip points from 30% to 100% of rated torque. The magnetic switches work through the sealed metal housing.