DI bellow seal globe valve

The ductile iron bellows globe valve, fully named ductile iron bellows-sealed globe valve, is an upgraded high-end cut-off and regulating valve optimized on the basis of ordinary globe valves, specially designed for high-temperature steam, heating pipe networks and industrial high-temperature fluid working conditions. The valve body is integrally cast from high-strength QT450 ductile iron, featuring high toughness, strong impact resistance and excellent pressure resistance without cracking, thoroughly overcoming the defects of ordinary gray cast iron valves such as brittleness and poor high-pressure resistance. Adopting a full stainless steel bellows sealing structure instead of traditional packing sealing, the valve fundamentally eliminates common industry problems of ordinary globe valves, including stem leakage, packing aging failure and sealing failure under high temperatures. It is the preferred special valve for high-temperature heating systems and clean fluid pipelines.

Detail

Parameters

The ductile iron bellows globe valve adopts a dual sealing principle of bellows elastic sealing + forced end face sealing, delivering

stable, precise operation and ultimate sealing performance. The handwheel drives the valve stem to lift and lower, moving the

disc vertically along the center line of the valve seat to realize pipeline medium cut-off and opening adjustment. The core sealing component is a stainless steel bellows, precisely welded to the valve stem at one end and

fixed inside the bonnet at the other. The entire lifting movement of the valve stem relies on the elastic expansion and contraction of the

bellows, which completely seals the medium inside the bellows and isolates it from the external stem area.

When the valve opens, the bellows stretches with the movement of the valve stem, separating the disc from the seat for smooth medium

flow and precise regulation of flow rate and pressure. When the valve closes, the disc tightly presses against the valve seat to achieve

end face sealing and block medium circulation. Equipped with graphite packing for auxiliary backup sealing, it forms a double protection

structure. It effectively prevents stem leakage and packing aging failure even under long-term frequent operation. The valve perfectly

adapts to the thermal expansion and contraction of high-temperature steam and can absorb minor pipeline thermaldisplacement

to protect the pipe network system.

Core Product Advantages

✅ Zero external leakage, completely eliminating dripping and leaking

Adopting a fully enclosed bellows sealing structure with no packing wear and leakage risks. It fundamentally solves stem

leakage caused by high-temperature steam and corrosive media. With a high sealing grade, it is suitable for clean,

environmental-friendly and explosion-proof working conditions.

✅ High temperature and aging resistance for harsh conditions

Equipped with professional stainless steel bellows and graphite sealing components, the valve can withstand long-term

operation with high-temperature steam and hot water. It resists thermal expansion and contraction, maintaining

stable sealing performance under high temperatures, far superior to traditional packing globe valves.

✅ High-strength ductile iron body for durable performance

Made of QT450 ductile iron with excellent toughness, impact resistance and high-pressure resistance. It is crack-proof,

temperature-resistant and corrosionresistant, effectively avoiding fracture and leakage failures common with

ordinary cast iron valves.

✅ Dual functions of cut-off and precise throttling

It achieves complete medium cut-off with zero internal leakage and accurate opening adjustment to fine-tune pipeline flow and pressure. It delivers outstanding pressure stabilization and throttling effects, meeting refined pipe

network control requirements.

✅ Maintenance-free design and long service life to reduce operating costs

No regular packing replacement is required. The fatigue-resistant and wear-resistant bellows provides a service life

3–5 times longer than ordinary globe valves. Minimal daily maintenance greatly reduces later repair and replacement costs.

✅ Pipe network stress buffering to protect pipeline equipment

The bellows structure provides micro-deformation compensation, absorbing thermal expansion and contraction displacement of pipelines, relieving thermal stress and reducing structural damage to pipes and valves, improving overall system stability.

✅ Wide compatibility and complete specifications

Available in multiple calibers and pressure grades with flange connection. It is applicable for various media including steam,

hot water, oil products, air and mildly corrosive fluids, covering civil and industrial application scenarios.

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