Product overview: swing check valve is suitable for dry nominal pressure of pn1.0mpa-42.0mpa, class150-2500; nominal diameter of dn15-1200mm, nps1 / 2-48; working temperature of - 196-540 ℃ on various pipelines, dry to prevent backflow of media. By selecting different materials, it can be applied to dry water, steam, oil, nitric acid, sound acid, strong oxidizing medium, urea and other media. It is suitable for cleaning medium, not suitable for medium with solid particles and high viscosity.