BYT1-180Z/12 Series Explosion-Protected Electro-Hydraulic Thruster

The BYT1-180Z/12 Series​ is a specialized, heavy-duty explosion-proof (Ex) electro-hydraulic thruster​ designed for safe and reliable operation in hazardous environments where flammable gases, vapors, or dusts may be present. It is a linear actuator primarily used to engage or disengage industrial brakes on equipment operating in such classified areas.

Core Design & Certification

This thruster shares the fundamental oil-immersed electro-hydraulic working principle of the standard YT1 series but is housed within a robust, certified explosion-proof enclosure. Its design prevents internal electrical sparks or high surface temperatures from igniting the surrounding hazardous atmosphere.

Key Explosion Protection Feature:​ The entire assembly, including the terminal box, is constructed to meet stringent international explosion-proof standards, such as:

ATEX (Europe):​ Typically certified for both Gas (II 2G) and Dust (II 2D) environments.

IECEx (International).

Other regional standards (e.g., NEC for North America).​ Common certifications would be for Ex d IIC T4 Gb / Ex tD A21 IP66 T135°C Db, indicating a flameproof enclosure for gases and dust ignition protection.

Operating Principle

The principle is identical to standard thrusters: An integrated explosion-proof motor drives a centrifugal hydraulic pump. The pump pressurizes the oil inside the sealed body, forcing the piston to extend and compress the brake spring (releasing the brake). Upon power loss, the spring force returns the piston, automatically applying the brake-a critical fail-safe feature for hazardous areas.

Key Features & Specifications

Explosion-Proof Construction:

Flameproof Enclosure ('d'):​ The motor and terminal housing are designed to contain any internal explosion without letting flames propagate to the outside atmosphere.

Increased Safety ('e'):​ Applied to terminal connections to prevent sparks and excessive temperatures.

Dust Ignition Protection:​ The enclosure prevents dust ingress and limits surface temperatures.

High Thrust & Long Stroke:​ The "180" indicates a high thrust class (approximately 1800 N / ~180 kgf), and the "/12" denotes a long stroke of 120mm, suitable for brakes requiring significant actuator travel.

Oil-Immersed & Self-Cooling:​ All running parts operate in an oil bath, ensuring lubrication, cooling, and quiet, durable operation. The oil also helps dissipate heat from the motor, keeping external surface temperatures within safe limits (Temperature Class T4, max. 135°C surface temp).

Rugged Cast Iron Housing:​ The body is constructed from heavy-duty, corrosion-resistant cast iron to withstand harsh industrial and potentially corrosive atmospheres.

Specialized Sealing:​ High-integrity shaft seals and housing gaskets prevent internal oil leakage and the ingress of external contaminants or flammable media.

Typical Technical Data

Thrust:​ ~1800 N

Stroke:​ 120 mm

Power Supply:​ 380V/415V/660V, 3-phase, 50/60 Hz (with Ex-d motor).

Motor Power:​ ~0.75 kW - 1.1 kW (explosion-proof rated).

Duty Cycle:​ High (e.g., 60% or more).

Protection Class:​ Minimum IP65, often higher (IP66/IP67).

Temperature Class:​ Typically T4 (≤135°C).

Primary Applications

It is exclusively used in hazardous areas (Zones 1, 2, 21, 22)​ to actuate failsafe brakes on:

Overhead Cranes in Chemical Plants, Oil & Gas Refineries, Paint Shops.

Hoists and Winches in Mining (where combustible dust is present).

Conveyors in Grain Silos, Fertilizer, and Pharmaceutical Plants.

Equipment in Offshore Platforms, Petrochemical Facilities, and Spray Booths.

Advantages

Intrinsic Safety for Hazardous Areas:​ Enables the use of powerful electro-hydraulic actuation where standard devices are prohibited.

Maintains All Thruster Benefits:​ Delivers the same smooth, powerful, and durable performance as the standard YT1 series.

Fail-Safe Operation:​ Spring-applied braking is automatic on power loss-a critical safety requirement.

Proven and Robust Design:​ Based on a widely trusted thruster platform with added Ex protection.

Summary

The BYT1-180Z/12 Series Explosion-Protected Electro-Hydraulic Thruster​ is a purpose-built safety device. It combines the reliable, high-thrust (1800N), long-stroke (120mm) linear actuation of a standard thruster with a certified explosion-proof enclosure. This allows it to safely operate industrial brakes in flammable atmospheres, providing essential motion control and safety for material handling equipment in the oil & gas, chemical, mining, and pharmaceutical industries.

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