What Are the Differences Between the Mission Series and the QL Series?

Both the Mission series and the QL series are mainstream DTH (down‑the‑hole) hammer interface systems, but they differ noticeably in structural design, airflow configuration, suitable working conditions, and market positioning.

I. Basic Comparison (Core Differences)

II. Structural and Performance Characteristics

Mission Series Features

· Advantages: simple construction, easy maintenance, and relatively low air‑supply requirements (can operate at low pressure).

· Disadvantages: slightly lower energy efficiency; under high‑pressure conditions, its performance is inferior to the QL series; wear is somewhat faster under prolonged high‑load operation.

QL Series Features

· Advantages: better airflow distribution, higher impact efficiency, energy savings (faster penetration at the same air volume), more stable drilling (especially in deep holes), and generally longer service life.

· Disadvantages: requires higher‑quality air supply and more capable equipment.

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III. Comparison of Applicable Formations

The Mission Series is more suitable for:

· Soft to medium‑hard rock (e.g., limestone, sandstone, shale)

· Sites with unstable air pressure

· Small‑scale mines, water wells, and general construction projects

· Cost‑sensitive operations

The QL Series is more suitable for:

· Medium‑hard to ultra‑hard rock (e.g., granite, basalt, quartzite)

· Deep‑hole drilling

· Large‑scale mining and high‑intensity operations

· High‑pressure equipment (e.g., above 25 bar)

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Summary

· If working conditions are unstable, choose the Mission series.

· If you pursue efficiency, have premium equipment, and drill hard rock, choose the QL series.

· With a small compressor / low air pressure → Mission is more reliable.

· With a large compressor / high air pressure → QL delivers faster penetration.