What is the main difference between a globe valve and a gate valve?
The fundamental difference is in function: globe valves are designed for both throttling (flow regulation) and shut-off, while gate valves are designed only for full-open / full-close isolation. Globe valves have an S-shaped flow path that provides progressive flow control as the stem moves — this makes them excellent for precise regulation but creates higher pressure drop. Gate valves have a straight-through flow path with minimal pressure drop when open but cannot throttle because partially open operation causes vibration and seat erosion. Choose a globe valve when you need to control flow; choose a gate valve when you need simple on/off isolation with low head loss.
What are globe valves used for?
Globe valves are used wherever flow regulation, throttling, or frequent operation is required. Key applications include: steam system pressure and flow control, boiler feedwater and condensate regulation, cooling water bypass circuits, fuel oil and gas flow metering stations, chemical injection and dosing systems, high-pressure vent and drain services in power plants, bypass lines around larger gate or ball valves, compressor recycle and anti-surge control, and sampling stations in process plants. TANGGONG globe valves are available in straight, angle, and Y-pattern configurations to suit different piping layouts and flow conditions.
What is a bellows seal globe valve?
A bellows seal globe valve incorporates a metallic bellows element (typically multi-ply 316L stainless steel or Inconel 625) that is welded to both the valve stem and the bonnet. This creates a hermetic, zero-leakage primary seal that completely prevents process fluid from escaping to the atmosphere through the stem packing area. Bellows seal globe valves are essential for: toxic or lethal service media (ammonia, chlorine, phosgene), flammable hydrocarbons where fugitive emission regulations apply (ISO 15848, EPA Method 21), heat transfer oil systems (thermal fluid at 300°C+), vacuum service where air ingress must be prevented, and any application where environmental or personnel safety demands zero stem leakage. TANGGONG bellows seal globe valves include a secondary graphite packing as a safety backup and are helium mass spectrometer tested.
Why choose Y-pattern globe valve over straight pattern?
Y-pattern globe valves position the seat and stem at approximately 45° to the pipeline axis rather than 90° (straight/T-pattern). This angled flow path provides several key advantages: 30–50% lower pressure drop compared to standard straight pattern valves; reduced turbulence and lower risk of cavitation at high differential pressures; better performance at high flow velocities in steam, gas, and hydrocarbon services; more compact installation profile in some piping arrangements; and the ability to handle higher pressure ratings (Class 150–2500) more efficiently. Y-pattern globe valves are the preferred choice for main steam isolation in power plants, high-pressure refinery steam headers, and pipeline depressurization systems where minimizing valve-induced energy loss is economically important.
What materials are TANGGONG globe valves made from?
TANGGONG manufactures globe valves in an extensive range of body and trim materials: body materials include ASTM A216 WCB (carbon steel), A217 WC6/WC9 (chrome-molybdenum for high-temperature steam), A351 CF8/SS304 and CF8M/SS316 (austenitic stainless for corrosive and cryogenic service), A105 (forged carbon steel) and A182 F304/F316 (forged stainless steel). Trim (disc and seat) materials include 13% Cr stainless steel (standard), SS304, SS316, Stellite 6 hard-faced overlay (for severe erosion service up to 600°C), Monel and Hastelloy for highly corrosive acids and chlorides. Bellows seal options use multi-ply 316L or Inconel 625 bellows rated for thousands of full-stroke cycles. We also manufacture specialty alloys — please contact our engineering team with your material requirements.
