The Richter RSS/F Bellow-Sealed Control Valve is ISO/DIN design. The RSS/F series features a standard bellows, seat and plug made of modified pure PTFE replaceable, stainless steel stem, with travel stop, rubber protective bellows acc. to German accident prevention regulations. Face-to-face according to DIN EN 558-1 and ISO 5752 series 1 or ANSI/ISA-75.08.01. The RSS/F are available actuator operated.