HYDAC賀德克比例溢流閥PDB16221PE 英文描述 The proportional pressure relief valve PDB16221PE is a pilot-operated cartridge valve - spool type. It permits continuous adjustment of the relief pressure, depending on the electrical current. It has an additional tank connection with spring chamber relief. Cavity (metric) M 33 x 2. Qmax = 300 l/min Pmax = 350 bar