The GST Et-Gun Ethanol HVOF Spray Gun is a high-pressure liquid-fuel High-Velocity Oxygen Fuel (HVOF-LF) torch engineered for industrial deposition of dense carbide, cermet, metal and alloy coatings. The gun uses ethanol and oxygen to generate a high-energy combustion jet and is designed for applications requiring high particle velocity, low coating porosity and repeatable coating performance.
The GST Et-Gun Ethanol HVOF Spray Gun is a high-pressure liquid-fuel High-Velocity Oxygen Fuel (HVOF-LF) torch engineered for industrial deposition of dense carbide, cermet, metal and alloy coatings. The gun uses ethanol and oxygen to generate a high-energy combustion jet and is designed for applications requiring high particle velocity, low coating porosity and repeatable coating performance.
Ethanol and oxygen are injected, mixed and atomized in a pre-combustion stage before entering the main combustion chamber. The optimized multi-stage combustion architecture supports chamber pressures up to 13 bar (188 psi). After combustion, the gas stream is accelerated through the nozzle to form a supersonic jet. Powder is injected radially near the end of the combustion chamber / interconnector region, where it is mixed, heated and accelerated toward the substrate.
Compared with conventional kerosene HVOF technology, ethanol operation provides a wider process window and can reduce oxygen consumption by approximately 30-50% while reducing required cooling power by up to approximately 50%, depending on the coating recipe and system configuration. Ethanol also enables stable operation under neutral, oxygen-rich and fuel-rich conditions without soot formation, helping reduce the risk of carbon contamination.
The GST Et-Gun is suitable for integration with stationary or mobile HVOF-LF systems, industrial robots, gun manipulators and complete coating cells. Final process limits, hardware configuration and utilities are selected according to the coating material, powder size distribution, production rate and required coating properties.
Key benefits
- Ethanol-fueled HVOF-LF architecture with combustion chamber pressure up to 13 bar (188 psi).
- High particle velocity supports dense, low-porosity coatings with strong coating integrity.
- Radial powder injection supports controlled particle heating and efficient acceleration.
- Wide operating window supports neutral, oxygen-rich and fuel-rich HVOF parameter sets.
- Approximately 30-50% lower oxygen consumption than conventional kerosene HVOF under comparable reference conditions.
- Cooling-power requirement can be reduced by up to approximately 50% compared with conventional kerosene HVOF processes.
- Cleaner combustion with no soot formation and reduced risk of carbon contamination during fuel-rich operation.
- Suitable for automated, robotic, stationary and mobile HVOF coating systems.
Reference performance note. Published particle-velocity and comparative utility figures are reference values for the established ethanol-fueled HVOF architecture. Final GST operating limits and approved recipes should be confirmed in the quotation and process documentation.
Optional Accessories and Consumables
The GST Et-Gun can be supplied with process-specific wear parts, cooling components, powder-feed hardware and installation accessories for system integration and lifecycle maintenance.
- Combustion and pre-combustion chamber service components
- Nozzle, barrel and interconnector components
- Radial powder-injection hardware, feed tubes and fittings
- Automatic ignition components and high-voltage ignition hardware
- Water-cooling fittings, hoses, seals and monitoring components
- Oxygen and ethanol check valves, high-pressure fittings and process hoses
- Gun mounting fixtures, manipulator brackets and robotic mounting hardware
- Replacement O-rings, seals and preventive-maintenance kits
The final spare-parts and consumables list is defined according to the supplied GST Et-Gun configuration and selected process hardware.
| No. | Article | Name | OEM Article No. |
|---|---|---|---|
| 1 | ST311045 | Spark plug assembly | 311.045 |
| 2 | ST311001 | F-Housing | 311.001 |
| 3 | ST311002 | O-Housing | 311.002 |
| 4 | ST311003 | Chamber housing | 311.003 |
| 5 | ST311004-02 | Pre-chamber HE s-1 | 311.004-02 |
| 6 | ST311005-01 | Combustion chamber s-2 | 311.005-01 |
| 7 | ST311006 | lnterconnector nut #1 | 311.006 |
| 8 | ST311007 | Adapter | 311.007 |
| 9 | ST311008-01 | lnterconnector s-2 | 311.008-01 |
| 10 | ST311009 | 4" Deflector | 311.009 |
| 11 | ST311010-22 | 4" Barrel s-10 | 311.010-22 |
| 12 | ST311011 | 4" Barrel housing | 311.011 |
| 13 | ST311012 | Barrel nut | 311.012 |
| 14 | ST311013 | 4" Water out tube | 311.013 |
| 15 | ST311014 | Water out fitting | 311.014 |
| 16 | ST311015 | lnterconnector nut #2 | 311.015 |
| 17 | ST311016-01 | Fuel injector assembly HE incl. 4x o-rings | 311.016-01 |
| 18 | ST311017 | Rearcover | 311.017 |
| 19 | ST311020-02 | Powder injector*10I s-20 | 311.020-02 |
| 20 | ST311029 | Fitting Powder Port*4I s-20 | 311.029 |
| 21 | ST311019 | Ferrule plastic *101s-20 | 311.019 |
| 22 | ST311018 | Nut ¼"" tube*4ts-20, incl. Ferrule plastic*4I s-20 | 311.018 |
| 23 | ST311035 | Bolts F-Housing*4 | 311.035 |
| 24 | - | DIN 912 socket head cap screw M4×50 | - |
| 25 | ST311034 | Bolts Barrel housing - Water out fitting*4 | 311.034 |
| 26 | ST311033 | Bolts O-Housing*2 | 311.033 |
| 27 | ST311032 | Bolt AMP Connector | 311.032 |
| 28 | ST311049 | AMP Washer | 311.049 |
| 29 | ST311062 | Dowel pin | 311.062 |
| 30 | ST311036 | Oxygen Check Valve s-1 | 311.036 |
| 31 | ST311040 | Fuel Check Valve s-1 | 311.040 |
| 32 | ST311041 | Nipple, 1/8" Fuel check valve to F- housing | 311.041 |
| 33 | ST311038 | Nipple, 1/8" Oxygen check valve s-1 | 311.038 |
| 34 | ST311037 | Adapter oxygen 45° ¼ NPT to O-Housing | 311.037 |
| 35 | ST311039 | Adapter, ¼" NPT | 311.039 |
| 36 | ST311042 | Adapter, 1/8" NPT | 311.042 |
| 37 | ST311043 | Adapter W45°, ¼" NPT | 311.043 |
| 38 | ST311061 | O-ring Fuel assy front*10 | 311.061 |
| 39 | ST311030 | O-ring F-Housing *10 | 311.030 |
| 40 | ST311021 | O-ring Water tube*10, Water out fitting*10 | 311.021 |
| 41 | ST311022 | O-ring lnterconnector*10 | 311.022 |
| 42 | ST311.023 | O-ring Barrel*10 | 311.023 |
| 43 | ST311060 | O-ring Fuel assy 3 *10 | 311.060 |
| 44 | ST311024 | O-ring Fuel assy 1 *10 | 311.024 |
| 45 | ST311028 | O-ring Front Barrel Nut*10 | 311.028 |
| 46 | ST311025 | O-ring Fuel assy, Comb. chamber 2*10 | 311.025 |
| 47 | ST311026 | O-ring O-Housing*10 | 311.026 |
| 48 | ST311027 | O-ring Chamber housing, Barrel housing and Deflector*10 | 311.027 |
| 49 | - | O-ring 3.9×1.78, 70 NBR | - |
| 50 | ST311048 | AMP Connector (M) | 311.048 |
| 51 | - | 6540 6 Tee fitting | - |
| 52 | - | C1/Z 4/2 M5 2351001 Straight connector with male thread and union nut, M5–4/2 mm | - |
| 53 | ST500001 | Power feed hose | 500.001 |
Applications
The GST Et-Gun is intended for high-performance HVOF coatings where high particle velocity, dense microstructure and controlled thermal input are required. Typical applications include:
- WC-Co and WC-CoCr wear-resistant coatings on shafts, hydraulic rods, landing-gear components and other high-wear surfaces.
- Cr3C2-NiCr coatings for elevated-temperature wear, erosion and corrosion resistance.
- Wear and erosion protection of pump, valve, compressor and process-industry components.
- Hydropower components such as runners, guide surfaces and other erosion-prone areas.
- Industrial rolls, sleeves, plungers, mandrels and dimensional-restoration applications.
- Nickel-, cobalt- and iron-based alloy coatings for corrosion and surface restoration.
- Applications requiring fuel-rich / reducing HVOF conditions to limit oxidation or carbon contamination.
- Automated production coating in robotic cells and mobile repair or field-service applications.
FAQ
What is the GST Et-Gun HVOF Spray Gun used for?
The Et-Gun is used for high-performance HVOF deposition of carbide, cermet, metal and alloy coatings where high coating density, wear resistance, erosion resistance or corrosion protection is required.
Which fuel does the GST Et-Gun use?
The GST Et-Gun is a liquid-fuel HVOF torch designed to operate with ethanol and oxygen.
What combustion pressure does the Et-Gun operate at?
The gun is designed for combustion chamber pressures up to 13 bar (188 psi). Actual production pressure depends on the qualified coating recipe.
What spray deposition rate does the Et-Gun support?
The published GST system specification lists a spray deposition rate of 60-170 g/min. Actual throughput depends on powder density, particle-size distribution and process parameters.
What cooling water does the Et-Gun require?
The GST configuration specifies approximately 28-35 l/min cooling-water flow, 10 bar minimum / 15 bar recommended pressure, and an inlet temperature of 10-21 °C.
How much oxygen and ethanol are required?
The GST system configuration provides for oxygen flow up to 700 Nl/min and ethanol consumption up to 40 l/h. Actual consumption is recipe dependent and can be substantially lower for individual coating parameters.
Why use ethanol instead of kerosene for HVOF?
Ethanol provides a wide operating window, cleaner soot-free combustion and, under comparable reference conditions, can reduce oxygen consumption by approximately 30-50% and cooling-power requirements by up to approximately 50% compared with conventional kerosene HVOF.
Can the GST Et-Gun be integrated into automated coating systems?
Yes. The Et-Gun is suitable for integration with stationary or mobile GST HVOF-LF systems, industrial robots, manipulators and complete coating cells. The final mounting and process interfaces are confirmed for each project.
|
Oxidizer
|
Oxygen (O2) |
|
Powder carrier gas
|
Nitrogen; maximum flow up to 20 Nl/min in the GST system configuration |
|
Gun type
|
Industrial ethanol-fueled HVOF spray gun |
|
Cooling medium
|
Water |
|
Cooling water inlet temperature
|
10-21 °C |
|
Cooling water pressure
|
10 bar minimum / 15 bar recommended |
|
Installation
|
Stationary, robotic, manipulator-mounted or mobile HVOF-LF systems |
|
Powder injection
|
Radial injection into the interconnector / barrel entrance region |
|
Sprayable materials
|
Carbides, cermets, metals and alloy powders qualified for HVOF spraying |
|
Fuel
|
Ethanol (C2H5OH) |
|
Spray deposition rate
|
60-170 g/min, powder and parameter dependent |
|
Maximum combustion chamber pressure
|
Up to 13 bar (188 psi) |
|
Maximum oxygen flow rate
|
700 Nl/min |
|
Maximum ethanol consumption
|
40 l/h |
|
Reference measured particle velocity
|
Up to approx. 1,000 m/s for metallic powders; material and parameter dependent |
|
Cooling water flow rate
|
28-35 l/min |
|
Process
|
High-pressure High-Velocity Oxygen Fuel - liquid fuel (HVOF-LF) |
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