Quick answer: oil and gas service is decided by three things — whether the medium is sour, whether the line is a pipeline or a process line, and how often the valve is operated. Carbon steel covers clean hydrocarbon and utility duty; stainless steel or higher grades are needed once chlorides, sour service or low temperature enter the picture.
Recommended valve matrix
| Service | Valve type | Body material | Notes |
|---|---|---|---|
| Pipeline isolation | Ball valve, trunnion mounted | WCB / CF8M | Full bore for pigging; fire-safe design |
| Process isolation | Gate valve | WCB / CF8M | Full-open or full-close only |
| Pump discharge | Swing check valve | WCB / CF8M | Check closure behaviour against surge risk |
| Steam and condensate | Globe valve, gate valve | WCB | Trim selected for temperature |
| Corrosive or wet service | Gate, globe, ball | CF8M and above | Confirm chloride level and temperature |
Material decisions that matter most
- Sour service: hardness and chemistry must be controlled, and the material class agreed in the specification
- Low temperature: carbon steel has a lower working limit, so low temperature steels or austenitic stainless steel are used
- Chlorides: stainless steel grade must be chosen against the chloride level and temperature, not by name only
- External environment: offshore and coastal sites need coatings and bolting chosen for the atmosphere
Documentation typically required
- Material certificates traceable to the heat number
- Pressure test records for shell and seat
- Non-destructive examination records where specified
- Third-party inspection and release before shipment where required
待补内容位：待补：本行业实际供货案例（国家 / 介质 / 阀型 / 数量级，客户名可脱敏）；如已进入 ADNOC 或 ARAMCO 供应商体系，在此处按事实说明。