Parallel single ram valve scope limits

Parallel scope deficiency in single ram valve gate mainly for cutting in line, average diameter DN of 50 mm or cutting device how to choose it, sometimes diameter small cutting device also chooses gate valves. Generally used in coal mine, petrochemical and power plant ash. The dimensions and open height are larger. Install the required space. Opening and closing process, has the relative friction sealing surface, easy to cause scratches. Gate valves are generally have two sealing surface, adds some difficulties to machining, grinding and maintenance.