Gate valves give full-bore isolation with a screwed-bonnet, multi-turn stem — the older design ball valves have replaced for most general isolation work, but still the right or required choice for a handful of jobs: WaterMarked potable water lines (Zetco's bronze range is WaterMark certified to AS 1628, several listings under licence WM-020284), underground and meter-pit isolation with a key-cap or T-bar head, lockable valves for fire services and shared plant rooms, and high-pressure large-bore lines rated beyond a standard ball valve's range.
Range includes ACP's general-purpose brass gate valve (not WaterMark-rated), Austworld's lead-free brass lines in wheel, T-bar and underground key-cap patterns, and Zetco's bronze range — standard, PN32 heavy pattern, T-bar, key cap, lockable and large-bore handwheel — plus a replacement handle set for servicing an existing valve. Guide: Gate Valves vs Ball Valves: When a WaterMarked Bronze Gate Valve Still Wins.
