▶ Core structural components

▶ Main types and specifications

1. Classification by structure

2. Common Specifications

Pipe diameters range from DN50mm to DN3000mm and above. Sealing pressure is generally 0.1~0.6MPa. Appropriate models can be selected based on the actual pipeline conditions.

▶ Working principle and operation process

1. Core Working Principle

Inflation → The bladder fits tightly against the inner wall of the pipe → A sealing surface is formed → Water flow is blocked using friction and elasticity → Deflating and contraction → Rapid removal

2. Standard Operating Procedures

1. Preparation: Check the airbag for damage, remove any sharp objects from the pipeline, and select the appropriate size.

2. Installation: Place the airbag in the designated position, ensuring it is centered and avoiding misalignment.

3. Inflation: Connect the inflation device and slowly pressurize to the rated pressure (refer to the instruction manual), observing the pressure gauge.

4. Sealing: Confirm the sealing effect and begin pipeline work (repair, water tightness test, etc.).

5. Deflating: After the work is completed, slowly release the gas, and remove the airbag after it has fully deflated.

▶ Main application scenarios

1. Municipal Pipeline Engineering: Emergency repair of sewage pipelines, dredging of drainage pipelines, and water testing of new pipelines.

2. Building Water Supply and Drainage: Water tightness testing of building pipelines, waterproofing inspection of bathrooms, and pipeline renovation.

3. Pipeline Inspection: Sealing before CCTV endoscopic inspection, pipeline leak detection, and functional testing.

4. Emergency Treatment: Temporary water sealing for pipeline ruptures, tunnel/culvert sealing during flood season, and urban flood control.

5. Industrial Pipelines: Repair of chemical pipelines, sealing of power plant circulating water pipelines, and treatment of mine drainage pipelines.

▶ Advantages and limitations

Advantages and Features:

Rapid Deployment: Installation completed in minutes, far exceeding traditional sandbag/brick sealing methods.

Reusable: High-quality airbags can be used dozens of times, reducing long-term costs.

Highly Adaptable: Compatible with various pipe diameters and materials (concrete, steel, PVC, etc.).

Safe and Environmentally Friendly: No chemical sealants required, avoiding water pollution and meeting environmental protection requirements.

Easy to Operate: Can be completed by a single person, requiring no large equipment, reducing construction difficulty.

▶ Compared with traditional blocking methods

▶ Core Manufacturing Process of Water-Blocking Airbags

Water-blocking airbags are molded products made of rubber composite materials. The core manufacturing process revolves around rubber mixing, reinforcing layer lamination, molding and vulcanization, component assembly, and finished product testing. The core requirements are to ensure the airtightness, tensile strength, tear resistance, and fit of the airbag to the pipeline. Airbags made of different materials (natural rubber, EPDM, neoprene rubber) differ only in rubber mixing formula and vulcanization parameters; the overall process flow is unified. The following is the complete standardized industrial production process, with key process control points marked.

I. Pre-production Preparation: Raw Material Selection and Pre-treatment

1. Core Raw Material Selection (Classified by Function)

Raw materials directly determine the performance of the airbag. The formula must be determined in advance based on the applicable medium, pressure, and temperature of the airbag. The core raw materials and requirements are as follows:

Rubber Raw Material: Natural rubber (NR), EPDM, chloroprene rubber (CR), etc., requiring purity ≥99%, free of impurities and aging;

Reinforcing Skeleton Material: Nylon 66 canvas, polyester canvas, aramid fiber cloth (for large-diameter/high-pressure airbags), requiring pre-impregnation treatment (impregnation with nitrile latex/chloroprene latex) to improve adhesion strength with the rubber;

Compounding Agents: Carbon black (reinforcing), zinc oxide/stearic acid (activating), antioxidants (anti-aging), vulcanizing agents (sulfur/peroxide), plasticizers (improving elasticity), precisely proportioned according to the formula, free from moisture and clumping;

Metal/Plastic Parts: Inflation valve (brass/ 1. Stainless steel components, pressure gauge interfaces, and fixed pressure plates must be rust-free and have intact threaded seals. Plastic parts must be resistant to aging and impact.

2. Raw Material Pretreatment

Raw rubber: Plasticize on a two-roll mill (temperature 50-70℃, roll gap 2-3mm) to soften the raw rubber for subsequent mixing;

Reinforcing canvas: Cut to size matching the airbag mold (including overlap allowance), and dry to a moisture content ≤0.5% to prevent bubbles after vulcanization;

Additives: Accurately weigh according to the formula (error ±0.1%). Powdered additives should be sieved through an 80-mesh sieve to remove impurities.