Globe valve is a linear motion valve mainly designed for fluid isolation or complete shut-off applications. Its trim assembly can be fully retracted from the flow path in the open position or completely seated to block the flow channel when closed.
Globe valves are mainly used for medium shut-off , and their flow resistance characteristics are higher than those of straight-through valves such as gate valves,making them suitable for applications where pressure drop control is not critical.
Globe valves are widely used for precise flow regulation. Their design must incorporate critical considerations of flow control range, pressure drop characteristics, and mechanical load distribution to prevent premature valve failure.
Valves designed specifically for high-pressure differential throttling applications require specially engineered internal trim components.
> Bolt connected valve bonnet, rising stem, lifting stem, metal seal.
> Connection of valve body and valve bonnet
The valve body and valve bonnet of globe valves within Class150~Class900 ( PN10~PN160) pressure ratings typically employ a stud-and-nut connection design.
> Actuation Type
Generally, hand-wheel actuation, worm gear actuation, gear actuation, electric and pneumatic actuation are used.
> Packing
Standard packing is flexible graphite formed packing; PTFE, metal wire reinforced flexible graphite formed packing or composite packing can be selected according to actual requirements.
> Backseat structure
The entire series is equipped with a backseat structure. Carbon steel valves generally have replaceable backseat ring, while stainless steel valves feature a formed backseat through integral machining or overlay welding; The backseat structure ensures reliable sealing when the valve is fully open.
> Seat
Carbon steel globe valves use forged valve seats with spray-welded, user-specified alloy sealing surfaces. For NPS≤10 and DN≤250, the valve seat are default threaded connections to the valve body, with welded connections also available.. Valves with NPS≥12 and DN≥300 typically employ welded connections. Stainless steel globe valves generally feature integral seats (machined from the valve body) or overlay-welded alloy directly on the body. Threaded or welded seats may also be configured based on requirements.
> Design of valve stem
The valve stem is manufactured as an integral forged component, with its minimum diameter strictly adhering to industry standard specifications.
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