Gate and globe valves look similar from the outside — rising stems, handwheels, bolted bonnets — and are often ordered from the same API 600 / BS 1873 family. Internally they are opposites: one is built to stay fully open or fully closed, the other to hold any position in between.
A gate valve opens into a straight, unobstructed bore with almost zero pressure drop — but its wedge seals only at full closure, and a partially open wedge chatters against the seats and erodes them. A globe valve turns the flow through an S-path onto a plug and seat. The geometry costs significant pressure drop, and buys precise, stable flow adjustment at any opening.
This is the distinction that destroys valves when ignored. Throttling with a gate valve concentrates high-velocity flow across the last millimetres of wedge travel, wire-drawing the seating faces in weeks. A globe valve's plug is designed for exactly that duty — velocity is taken across the plug contour, not the seal faces, and the seat survives years of regulation. Conversely, using a globe valve for rare open/close isolation wastes its cost premium and pressure drop.
Globe valves need fewer handwheel turns (shorter stroke) but higher seating force — line pressure acts on the full plug area. On larger sizes or higher classes, check the required rim force or specify a gear operator. Flow direction matters too: globe valves are directional (normally flow-under-seat); gate valves are bidirectional.
A typical steam line uses both: gate valves at the header for isolation, a globe valve downstream for regulation. VTXFLOW casts and forges both families to API 600 / API 602 / BS 1873 with 100% API 598 testing — request a quotation with your P&ID tag list.