Blowguns and kits with blowgun and hose

Blow Guns and Sets with Blow Gun and Hose – Precise Cleaning, Modular Configuration

Blow guns are workshop and production-relevant tools for the targeted removal of chips, dust, coolant residues, and particles from components, machine tools, and assembly surfaces. In this category, we offer blow guns, nozzles, extension tubes, and complete sets made of polymer and metal from the Legris brand, designed for industrial applications with requirements for safety, energy efficiency, and process integration.

Construction and Materials

Blow guns typically consist of a handle housing, valve mechanism, nozzle, and connection fitting. Legris products feature hardened metal housings for high mechanical stress and chemically resistant polymer versions (PA, polypropylene) for corrosive environments or when weight reduction and insulation are required. Nozzles are made of brass, stainless steel, or technical plastics; brass nozzles offer good formability and thermal conductivity, while stainless steel nozzles provide maximum corrosion resistance and wear resistance. Extension tubes are available in round and beveled shapes, with diameters typically ranging from 4–10 mm and lengths from 50 mm to 600 mm, to reach hard-to-access areas.

Connection Types, Seals, and Hoses

Connections and seals are essential for operational safety. Standard connections for Legris are G 1/4" or 1/8" (BSP/ISO) as well as quick-release pneumatic connectors according to ISO 6150 or DIN 2353. Seals are often made of NBR (Buna-N) for general applications or FKM (Viton) for high temperature and chemical resistance. Hose sets typically combine an outer hose made of PVC, PU, or NBR with a suitable fitting; PU hoses offer high abrasion resistance and flexibility, PVC hoses are cost-effective and resistant to oils, and NBR hoses are suitable for contact with oil and grease.

Safety and Energy-Saving Features

Industrial blow guns must comply with safety standards and pressure limits. Legris models often integrate pressure-limiting valves that reduce maximum nozzle pressures, and check mechanisms that prevent sudden pressure drops. Coanda and Venturi nozzles are special variants: The Coanda nozzle uses adjacent airflows for wider, uniform air distribution with lower pressure consumption; the Venturi nozzle creates a suction effect through clever cross-section guidance, drawing in ambient air and thus removing material more efficiently without putting more strain on the compressor. Such nozzles save energy and reduce noise emissions because lower operating pressures are sufficient for the same cleaning effect.

Application-Oriented Design and Ergonomics

The choice between metal and polymer versions depends on the application: In heavy industry and near welding areas, metal housings are robust against impacts, sparks, and high temperatures. Polymer versions reduce product weight and prevent scratches on sensitive surfaces. Ergonomic handles with non-slip inserts improve operating comfort during continuous use; angled extension tubes allow cleaning of internal edges without structural disassembly. For potentially explosive areas, ATEX-compliant variants are available that prevent electrostatic charging and spark formation.

Maintenance, Wear Parts, and Replacement Intervals

Regular inspection of the nozzle opening, valve seat, and seals ensures consistent performance. Visual and pressure tests should be scheduled during shift operation; worn nozzle openings lead to turbulent flows, increased pressure requirements, and uneven cleaning effects. Replacement intervals depend on material and usage: In abrasive environments, stainless steel nozzles are preferable and should be checked annually; NBR seals should be replaced more frequently when exposed to oil or temperature. Legris spare parts are modular, allowing nozzles, O-rings, and valve springs to be changed quickly without replacing the entire tool.

Practical Application Examples

Practical Example 1 – Machine Tool Cleaning: In a CNC workshop, a Legris metal blow gun with a 300 mm extension tube and stainless steel nozzle is used to blow chips out of drilled holes and threads. The combination of a Venturi nozzle and lower operating pressure reduces compressed air consumption by up to 20% compared to conventional nozzles, while the suction effect removes small chips from cavities. The nozzle is briefly checked for wear after each shift and replaced if visible edge abrasion is present. Practical Example 2 – Assembly Line and Sensor Technology: On an assembly line with sensitive electronic components, a polymer blow gun with a Coanda nozzle is used to remove dust without damaging delicate components. The wide air distribution reduces point pressure on circuit boards and prevents components from flying around. Hose sets with antistatic PU hoses prevent static charge and ESD damage. Practical Example 3 – Paint Shop Preparation: Before painting, components are freed from particles using a Legris blow gun and splash guard. The operator also uses an extension tube to reach internal contours and an FKM seal at the connection point to ensure solvent vapor resistance. The combination of targeted airflow and protective shield minimizes overspray while protecting the user.

Blow Gun Sets: Combinations and Advantages

Sets consist of a gun, a variable range of nozzles, extension tubes, and suitable hose lines. Advantages include immediate readiness for use and compatible connections. Configurable sets allow for individual replacement of nozzles (Coanda, Venturi, conical, or flat jet nozzles) as well as suitable quick couplings for mobile applications. Dealer-provided sets usually include an operating manual on pressure limits and application limits, as well as information on permissible media temperatures.

Purchase Criteria and Selection Aid

Choose according to the application: metal housing for robust industrial environments, polymer for sensitive surfaces and low weight. Pay attention to connection sizes (G 1/4" vs. 1/8"), sealing material (NBR vs. FKM), and certified safety features (pressure limitation, ATEX if required). Check whether Coanda or Venturi nozzles reduce air consumption and whether quick couplings facilitate process integration. Spare parts should be available and easy to change. More technical information on connection and sealing solutions can be found on our technical page: https://maku-industrie.de/technik.

Compatibility and Process Integration

Blow guns can be integrated into manufacturing cells, assembly lines, and automated deburring units. For robotic applications, compact, lightweight models with standardized threads and mounting interfaces are suitable. For stationary systems, fixed mounting of an extension tube with hose guide and inline filter is recommended to keep moisture and particles out of the compressed air. Information on practical applications and system examples can be found at: https://maku-industrie.de/anwendungsbeispiele.

FAQ

* Which nozzle is suitable for sensitive electronics? Coanda nozzles distribute air broadly and reduce point pressure; polymer nozzles and antistatic hoses minimize ESD risks. * How do I reduce compressed air consumption when blowing? Using Venturi or Coanda nozzles reduces the required operating pressure; additionally, pressure limiting valves and regular nozzle inspection help prevent leaks. * Which connection and sealing options are available? Common connections: G 1/4" and 1/8"; seals: NBR for general applications, FKM (Viton) for higher temperatures and chemical resistance; quick couplings according to ISO standards are standardized.