Bourgalt Positive Venting Chamber (PVC)
The Bourgault Positive Venting Chamber (PVC) provides for clean and dry air to enter the top port of each cylinder during tyne breakout action. This prevents harmful contaminants such as dust particles, chemicals and atmospheric moisture from entering the cylinder barrel.
High-Quality HVB™ Cylinder
The high-quality HVB™ cylinder is designed and manufactured specifically for the harsh agricultural climate. Each cylinder is manufactured and inspected to strict quality control, conforming to ISO 9000/2000:2000 standards. The front mounted cylinder is always retracted during normal operation, thereby protecting the chrome cylinder shaft from contamination and corrosion eliminating premature seal failures when in work.
Ball & Socket Clevis
The clevis is equipped with a ball-socket where it attaches to the HVB™ Lower Casting to minimise any side loading on the end of the cylinder rod during the tripping action.
The base of the HVB™ cylinder is secured to the top of the trip tower with a machined pin, allowing the cylinder to move forward and back during operation.
Front Mounted Retracted Cylinder
Front mounted retracted cylinders operate with low oil volume, significantly reducing hose and manifold pressure spikes as well as maximising the efficient use of accumulator capacity.
The HD HVB™ III Casting Assembly
The HVB™ casting assembly transfers the force from the ground-engaging tool and tyne to the HVB cylinder. The two castings pivot about a 25 mm diameter grade 8 bolt and nylatron bushing. This long-lasting design does not require greasing, and will provide many seasons of reliable service.