The document is a product manual for cylindrical valves from Swissfluid AG. It describes the valves as being suitable for shut-off, flow control, and throttling of corrosive, abrasive, or toxic process media. The valves have a modular design and are available in DIN or ANSI styles with manual operation handles. They have sturdy cast steel or stainless steel bodies lined with resistant materials like PFA or PFA-AS for maximum permeation protection and zero stem leakage.