Single seat regulator, Parabolic plug cage type, high pressure fuild medium Parabolic Plug Single Seat Cage Type Control Valve is German Technical design, single seat ... flow adjusting mechanism,Stated in institutions, including flow regulating valve seat stated, a valve spool and seat allocation, a stem end fixed ... operating noise.Size: DN15-400Pressure: PN16, 25, 40 Parabolic Plug Control Valve