Fall-Through Rotary Airlock Valve

The Fall-Through Rotary Airlock Valve (standard carbon steel/stainless steel construction, custom options available for wear-resistant/non-stick/high-temperature resistant applications) is a precision flow control device specifically designed for pneumatic conveying/gravity unloading of powder and granular materials. Leveraging the company's years of experience in fluid conveying and powder handling system integration, it focuses on "high-precision rotary unloading + leak-proof sealing + wear-resistant long-term operation + intelligent flow control." It employs flange quick-connect/flange direct connection/insertion installation structures, offering advantages such as stable unloading, no leakage, wide adaptability, low energy consumption, and convenient operation and maintenance. It strictly adheres to manufacturing standards such as GB/T 12224, JB/T 7376, and ISO 15604, and is suitable for unloading capacities from 0.5 to 50 tons. With a capacity of m³/h, operating temperature of -20℃ to 150℃ (a 200℃ high-temperature version is available upon customization), and operating pressure of -0.1 to 0.5MPa, this product is widely used in the continuous unloading and flow control of powder materials in industries such as fine chemicals, lithium battery materials, food processing, biopharmaceuticals, mining and building materials, and feed and plastics. It completely solves the industry pain points of traditional unloading devices, such as serious dust pollution, unstable flow, rapid wear, and poor sealing, achieving **zero dust leakage, precise and controllable unloading, and long-term stable operation**, helping enterprises build a dust-free, efficient, and safe powder conveying system.

As a core unloading and flow control component of a powder conveying system, this product focuses on "closed and precise unloading + full-process safety protection + wear-resistant and long-lasting operation and maintenance." These three functions work synergistically to connect upstream and downstream systems such as silos, dust collectors, pneumatic conveying pipelines, and mixing equipment, achieving continuous, stable, and leak-free material conveying and unloading. It is suitable for demanding operating conditions requiring high cleanliness, high wear resistance, and high sealing, meeting the dual needs of powder processing for precise flow control and environmental cleanliness.

High-precision, sealed unloading eliminates dust leakage : Utilizing a core structure of precision rotor + wear-resistant valve body + double-end mechanical seal, the gap between the rotor blades and the inner wall of the valve body cavity is controlled within 0.1~0.3mm, ensuring smooth and residue-free material unloading. Equipped with a double-layer fluororubber/EPDM rubber sealing ring + wear-resistant bushing seal combination, it achieves zero leakage at the shaft end, with a powder leakage rate of <0.01%, completely eliminating workshop dust and material escape. Supports positive/negative pressure pneumatic conveying conditions, serving as a continuous feeding device for pneumatic conveying systems, uniformly supplying powder to the conveying pipeline, preventing backflow and material shoving, and ensuring stable operation of the conveying system. Adaptable to various powder conditions, it can convey everything from ultrafine powders (such as lithium battery cathode materials, pharmaceutical powders, talc) to small particles (such as plastic particles, feed pellets, and ore pellets). Powders with poor flowability, high viscosity, and high abrasiveness can achieve smooth unloading through customized rotor structures (such as widened blades and anti-stick coatings).

Intelligent flow control, adaptable to continuous/intermittent operation : Standard configuration includes a variable frequency motor, speed display, and PLC linkage control module, which can precisely control the unloading volume by adjusting the rotor speed, with a control accuracy of ±2%, meeting the flow requirements of different process stages (such as batching, metering, and conveying); Supports manual/automatic dual-mode switching, and the automatic mode can be linked with the silo level sensor and the conveying system pressure sensor to achieve adaptive adjustment of the unloading volume, avoiding silo blockage, empty material, or overload of the conveying pipeline; The bottom of the valve body is equipped with an inspection port and quick-release structure for easy daily flow calibration and troubleshooting.

Wear-resistant and long-lasting + low-consumption operation and maintenance, suitable for long-term operation : Core components adopt a customized solution with wear-resistant materials: Valve body can be made of 304/316L stainless steel, carbon steel with powder coating/wear-resistant ceramic coating; Rotor blades can be made of high manganese steel, wear-resistant alloy steel, PTFE anti-stick coating material; The shaft end seal adopts a self-lubricating bearing/mechanical seal design, which does not require frequent lubrication and has low maintenance costs; Low operating resistance, the matching motor power is only 0.75~7.5kW, and the energy consumption is more than 20% lower than that of traditional unloading valves; The whole equipment adopts a sealed bearing seat and dustproof design to prevent dust from entering the bearing, extending the bearing life to 1~2 years, and significantly reducing operation and maintenance losses and downtime.

Safety protection and compliant materials, suitable for harsh working conditions : Standard features include overload protection, emergency stop button, and explosion-proof motor (optional) safety devices to prevent rotor jamming and motor overload burnout, ensuring safe equipment operation; the explosion-proof model complies with GB3836 standards and is suitable for flammable and explosive dust environments; the aseptic/food-grade model uses 316L stainless steel with a seamless polished finish, can withstand CIP/SIP online cleaning and sterilization, meets 3A hygiene standards and GMP certification requirements, and all material contact parts have passed food-grade/pharmaceutical-grade material testing; the high-temperature resistant model uses high-temperature resistant ceramic fiber seals and heat-resistant stainless steel, suitable for high-temperature powder unloading conditions of 150~200℃.

1. Precise and stable, with strong controllability of traffic.

The rotor is precision CNC machined, with high blade precision, good dynamic balance, stable operating speed, and small fluctuation in unloading volume. It is suitable for various process requirements such as continuous unloading, intermittent unloading, and quantitative unloading. It has a wide flow control range and can achieve stepless adjustment from 0 to 100%, meeting different unloading volume requirements from small-scale trials to large-scale production.

2. Excellent sealing, zero leakage, and dust prevention.

The combination design of double-end mechanical seal and valve body seal achieves full sealing at both ends of the shaft and valve body, completely solving the problems of powder leakage and dust generation. It is suitable for scenarios with strict requirements for environmental cleanliness, such as clean rooms, dust-free factories, and explosion-proof areas. The seals are made of wear-resistant and high and low temperature resistant materials, and the sealing performance does not degrade during long-term operation.

3. Wear-resistant and durable, suitable for various types of powders.

The core wear-resistant components can be customized according to the material characteristics, and are suitable for a variety of materials such as highly abrasive powders (such as ore powder and cement powder), high-viscosity powders (such as starch and coating powders), and ultrafine powders (such as lithium battery materials and pharmaceutical powders). This avoids problems such as blade wear and valve body jamming. The equipment has a service life of 5 to 8 years, and the replacement cycle of vulnerable parts (seals and blades) is long, resulting in low operation and maintenance costs.

4. Flexible installation, adaptable to various conveying systems

It supports three installation methods: direct flange connection, insertion type, and quick flange installation. It can be seamlessly connected to the discharge port of the silo, pneumatic conveying pipeline, dust collector discharge port, screw conveyor, etc. The flange interface conforms to the GB/T 9113 standard and can be connected to the existing powder conveying system without complicated modification. The machine has a compact structure and small footprint, making it suitable for space-constrained scenarios such as under the silo and next to the conveying pipeline.

5. Materials are compliant and suitable for all industry working conditions.

Material selection covers carbon steel, 304 stainless steel, 316L stainless steel, wear-resistant ceramics, PTFE, etc., which can meet the powder unloading needs of the entire industry, including chemical, lithium battery, food, pharmaceutical, mining, and feed. All materials are provided with material certificates (MTC), and key components have passed third-party wear resistance, sealing, and pressure resistance tests, meeting the product standards and environmental protection requirements of various industries.

Specifically designed for pneumatic conveying, gravity unloading, and flow control of powder materials, it is suitable for industries such as fine chemicals, lithium battery materials, food processing, biopharmaceuticals, mining and building materials, feed and plastics, and is especially applicable to:

Shanghai Hanye Engineering Technology Co., Ltd. specializes in powder conveying and unloading, focusing on the key challenges of precision, sealing, and wear resistance in powder unloading processes. With "precise controllability, zero leakage, and long-term maintenance" as its core principles, and in accordance with stringent industry standards, we provide customers with highly adaptable Fall-Through Rotary Airlock Valve and related system solutions. For detailed parameters, operating condition adaptation selection, unloading capacity calculations, or on-site case studies, please feel free to contact us!