for installation in pump heating systems, valve body made of corrosion-resistant red bronze, maximum response accuracy due to internal, generously dimensioned setpoint spring made of stainless steel, low-friction central guide for the valve disk, directly readable adjustment scale, stepless adjustment, secured against unintentional adjustment, Setting range 50-500 mbar, factory-set and pre-set to 200 mbar, permissible operating temperature TB 120 °C, permissible operating pressure PB 10 bar