HVG Valve Grinding Machine — IOP Marine. HVG Valve Grinding Machine For grinding of valves on high and medium speed diesel engines, Technical specification. Machine capacity Stem.For grinding of valve spindles on high and medium speed diesel engines The BSP is an electrically driven machine for grinding of valve spindles on high and medium speed diesel engines. The machine is available in semi- or fully automatic versions and comes delivered with precision settings for required grinding angles and can also be adjusted.