Two minutes let you know the cast steel globe valve

Globe valve, also known as the cut-off valve, is a forced-sealed valve, so the valve is closed, the pressure must be applied to the valve flap to force the sealing surface does not leak. When the medium from below the valve into the valve, the operating force needed to overcome the resista

Weld repair 4L-208 air compressor large pulley

Head mine machine city table paper number one part nominal size regulation gap first stage piston gas rainbow matching clearance to fit one or two piston cylinders fit clearance sand first stage piston ring scraper ring in the cylinder heat gap secondary piston ring scraping oil The ring