WCB ball valve manufacturer
API 608 / 6D, Class 150–600, fire-safe option.
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WCB Ball vs Gate vs Globe vs Swing Check
ASTM A216 Grade WCB is the cast carbon-steel body grade for non-corrosive steam, water, oil and process lines. The four types below share that material — the choice is function: quarter-turn isolation, rising-stem isolation, throttling, or backflow prevention.
Quick rule: Ball = fast on/off and automation. Gate = full-open isolation, low ΔP. Globe = throttle and regulate. Swing check = prevent reverse flow on pump discharge. Match ASME Class 150 / 300 / 600 to the pipe class — never mix flange ratings.
Side-by-side comparison
| Factor | Ball | Gate | Globe | Swing check |
|---|---|---|---|---|
| Primary duty | On/off isolation | Full open/close isolation | Throttling / stop | Backflow prevention |
| Operation | Quarter-turn | Multi-turn rising stem | Multi-turn | Automatic (flow) |
| Pressure drop (open) | Low (full bore) | Very low | Higher (path change) | Low when disc open |
| Throttle? | Avoid (seat wear) | No | Yes | N/A |
| Typical standard | API 608 / 6D | API 600 / 602 | BS 1873 / API 623 | API 594 / BS 1868 |
| Common classes | 150 / 300 / 600 | 150–2500 | 150–600+ | 150–600 |
| Steam / boiler | Utility / fire-safe option | Isolation standard | Stop & regulate | Condensate / discharge |
| Automation | ISO 5211 ready | Gear / actuator | Gear / actuator | None (passive) |
Manufacturer pages (one URL per type)
WCB gate valve manufacturer
API 600 OS&Y, Class 150–2500.
WCB globe valve manufacturer
BS 1873 / API 623 steam throttle.
WCB swing check manufacturer
API 594 / BS 1868 flanged NRV.
Typical train on a WCB Class 150 / 300 header
- Gate or ball — isolation upstream of equipment
- Y-strainer — debris protection (see WCB Y-strainer)
- Globe — where flow must be regulated
- Swing check — pump discharge / reverse-flow risk
Same ASTM A216 WCB body and RF flanges across the train keeps flange kits and MTC packages consistent. Step Class 150 → 300 → 600 only when the line list requires it.
RFQ checklist (any WCB type)
- Valve type (ball / gate / globe / swing check)
- Size (NPS or DN) and quantity
- ASME Class 150, 300 or 600 — RF / RTJ
- Trim (13Cr typical; Stellite / SS316 where specified)
- Operator (handwheel, gear, actuator) — N/A for check
- Fire-safe / IBR / NACE if applicable
- Destination port and document set (3.1 MTC, API 598)
Frequently asked questions
When should I use a WCB ball valve instead of a gate valve?
Use a WCB ball valve for fast quarter-turn on/off isolation, tight shut-off with soft seats, and automation (ISO 5211). Use a WCB gate valve for full-open isolation with minimal pressure drop on steam and process lines where rising-stem OS&Y indication is preferred.
Gate or globe for WCB steam service?
Gate for isolation (full open/close). Globe for throttling, frequent operation and steam stop/regulating duty. Do not throttle on a gate — seat wire-drawing follows.
Where does a WCB swing check belong in the train?
On pump discharge and lines that must prevent reverse flow. Swing checks give low pressure drop on horizontal runs; for slam-sensitive or vertical duty consider dual-plate wafer checks instead.
Are Class 150 and Class 300 WCB valves interchangeable?
No. Flange drilling, face-to-face and pressure–temperature ratings differ. Match the ASME pipe class on the line list and RFQ Class 150, 300 or 600 separately.
Send your WCB BOQ
List type, size, class, trim and quantity. Engineering response within 24 hours from Ahmedabad.
Or call +91 97732 78770 · info@supremevalves.in
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