Reverse Circulation Bits
Varel has developed a range of reverse circulation bits with various bearing packages. These bits are suitable for soft/medium formation drilling and have;
- Open non-sealed roller bearings,
- Semi sealed non-compensated roller bearings,
- Fully sealed compensated journal bearings.
Varel provides a range of products for reverse circulation applications. These bits are developed to provide exceptional performance in a wide variety of formations typically encountered during mineral exploration. The center hole is the maximum diameter possible for superior hole cleaning and cuttings retrieval. All RX and RSX circulation bits are precision machined to work with most existing R/C systems.
Products featuring both sealed and open bearings are available. Varel sealed bearing products for reverse circulation applications feature fully pressure compensated, non serviceable lubrication supplied to the industry’s most sophisticated journal bearing. The bearing features hardmetal inlays on all contact surfaces with silver-plated cone bearings, specially formulated seal compounds, and high-temperature lubricant. The bearings and seals are developed for long life.
Open bearing products feature precision roller bearings with special thrust elements to prevent axial wear. The cones are retained by ball bearings and the pilot pin features hardmetal inlays against a tool steel bushing.
Regardless of bearing type, the cutting structures on all reverse circulation products are designed to provide a combination of fast penetration and durability. These bits consistently provide the lowest cost per foot of drilled hole in mineral exploration applications.
