The 8021 GS4 is the high-pressure variant in Schubert & Salzer's 8021 sliding gate valve series, built with a 1.4571 (316Ti) stainless steel body and rated to PN 160 (ANSI #900) for DN 25–80 sizes. Its wafer-type design bolts directly between flanges, saving installation space without sacrificing flow capacity. The integrated positioner — available in digital (8049) or pneumatic (8047) versions — delivers fast, precise control for demanding industrial processes.

What pressure ratings does the GS4 offer across different sizes?

The pressure rating is size-dependent: DN 25–80 handles up to PN 160 (ANSI #900), DN 100–150 up to PN 100 (ANSI #600), and DN 200–250 up to PN 40 (ANSI #300). This stepped rating ensures the valve body and internals are appropriately sized for the mechanical loads at each diameter.

Which positioner and actuation options are compatible?

Two positioner families cover most applications. The 8049 digital positioner supports 2-wire and 4-wire configurations, IO-Link communication, and is available in ATEX-certified versions for hazardous areas. The 8047 pneumatic/electropneumatic positioner mounts to NAMUR standards and suits conventional 4–20 mA control loops. Actuation covers manual, electric, electropneumatic, and fully pneumatic — all using the same compact short-stroke actuator design.

How does the GS4 differ from the GS1 and GS3 variants?

The GS4 is the highest-pressure member of the 8021 family. GS1 covers general-purpose applications to PN 40, GS3 extends to PN 100 with optional Hastelloy C276 trim for aggressive chemicals, and GS4 reaches PN 160 with a 316Ti body specifically for high-temperature, high-pressure processes — steam systems, refinery services, and chemical reactor control where both thermal and mechanical stress are extreme.