The Coal Mine Gas Emission Initial Velocity Tester is a throttling differential pressure flow meter that operates on the principle of flow measurement. After a borehole is formed in the coal seam, the permeability of the coal seam increases due to the formation of fractured and plastic zones around the borehole, allowing gas to flow into the borehole. It consists of a coal dust filter, housing, panel, and shoulder strap. The panel is equipped with a flow display, an intake nozzle, and a shift flow meter, which are connected via hoses and quick-seal connectors. Gas enters the flow display and shift flow meter through the intake nozzle via the hose. Due to the throttling effect of the shift flow meter, the gas pressure in the sealed chamber increases, causing the flow display pointer to swing, thereby measuring the initial gas emission velocity from the coal seam borehole.

ZWS-1 Borehole Gas Emission Initial Velocity Tester Technical Parameters
Measurement Range: 0.5–30 L/min
Maximum Sealing Depth: 10 m;
Sealed Borehole Diameter: 42–50 mm;
Sealing Pressure: 0.06 MPa;
Rated Inflation Pressure: 0.2 MPa;
Sealer Dimensions: φ38 × 410.
Accuracy Grade: At an ambient temperature of 20 ± 10°C, ±2.5% for 10%–90%, and ±4% for below 10% and above 90%.
Weight: 0.97 kg
Dimensions: 155 × 100 × 125 mm
Operating Environment Conditions: -25 to 55°C, relative humidity ≤85%

Zhengzhou Aidi produces Coal Mine Gas Emission Initial Velocity Testers, supplying coal drill cuttings desorption testers, deep-hole sampling devices, pressure testers, geological exploration desorption testers, borehole flow meters, mine extraction and outburst prevention equipment, coal true density testers, gas content testers, automatic gas emission initial velocity testers, diffusion velocity testers, coal extraction pipeline gas parameter testers, borehole coal powder circulation devices portable gas extraction comprehensive parameter testers, mine-intrinsic safety coal seam gas pressure testers, coal gas content testers, gas outburst parameter testers, coal drill cuttings gas desorption testers, underground gas desorption testers, coal sample cans/coal sample cylinders, geological exploration gas desorption testers, and multi-stage borehole flow meters.

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