規格
| Design standards | API 6D, ASME B16.34, BS5351, API 608, MSS-SP-72 |
|---|---|
| Face-to-face dimensional standard | ASME B16.10, API 6D |
| Flange standards | ASME B16.5 |
| Fire Safe Design | API 607, API 6FA |
| bore type | Full bore, Reduced bore |
| Nominal valve connection size | DN15 to DN200 |
| End connection types | RF, RTJ, BW |
| Pressure class / nominal rating designation | Class 150 to 600 (PN16 to PN100) |
| Service temperature range | -46 to +200 C |
| Valve body material | WCB, CF8, CF8M, F304, F316, LF2, F22 |
| Bonnet material | WCB, CF8, CF8M, F304, F316, LF2, F22 |
| Ball material | F304, F316 |
| Stem material | WCB, F304, F316, F6a |
| Seat material | PTFE, RPTFE |
| Packing Materials | Graphite, PTFE |
| gasket materials | SS304, Graphite |
| Operation / closure mode | Handle, Gear, Electric actuator, Pneumatic Actuator |
應用與選型指引
Select by bore first (full bore for pigging or high-viscosity lines, reduced bore where a smaller ball is acceptable), then by seat: PTFE and RPTFE cover most duties inside the -46 to +200 C window, and the packing and gasket compounds matter for fugitive-emission or graphite-required plants. End connection follows the piping standard (RF or RTJ flanges, butt weld for welded lines). At high pressure or large bore the floating design reaches its torque limit; move to a trunnion-mounted execution rather than oversizing the actuator.
常見問題
Cast floating ball valve vs forged floating ball valve - which should I specify?
Both seat the same floating-ball way; the difference is the body manufacturing route. Cast bodies (WCB, CF8, CF8M) are the economical choice in the common Class 150 to 600 window, while forged bodies suit higher classes and critical service. Compare the pressure class and material certificate of the two executions rather than treating either family name as a quality grade.
What does the fire-safe designation API 607 / 6FA mean for this valve?
It means the seat-and-seal package is designed to keep a measure of tightness after a fire event: when the soft PTFE seats burn away, metal-to-metal contact and graphite secondary seals take over. Hydrocarbon service normally requires it; utilities and water lines usually do not. Confirm the required fire-safe test standard against the end user specification before ordering.
What information is needed to quote a cast floating ball valve?
Nominal size (DN15 to DN200 on the benchmark page), pressure class or PN rating, body and seat material preference, end connection (RF, RTJ or butt weld), operation (handle, gear, electric or pneumatic actuator), and the medium with its temperature. A quotation-ready inquiry with those points lets the execution, seat compounds and documentation set be confirmed exactly.
訂購與文件
文件
請在詢問時一併說明您需要的文件組合——此結構的常見項目（材質證明、按所列檢驗標準的測試報告、尺寸圖）將於報價時確認並隨附供應。
報價
可直接報價的詢問應說明：公稱口徑與壓力額定、閥體與閥座材質偏好、端部連接、操作方式，以及含溫度的使用介質。本頁的典型值為基準參考範圍；具有約束力的數值於報價時確認。
樣品與供應
供應條件、訂購數量與交期按訂單議定——請在詢問時說明目的地國家與所需時程。
儲存與運輸
閥門儲存時應保護閥座與密封件免受紫外線、臭氧與變形影響，安裝前保留端面保護蓋；彈性體或 PTFE 閥座結構應避免長期戶外存放——閥座材料在陽光直射與冰凍條件下老化最快。