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儀表針閥（needle gauge）
儀表針閥將壓力儀表與製程隔離，具三通與阻塞排放（block-and-bleed）設計，使壓力表與變送器可在不停管線的情況下拆卸或排放。產品範圍涵蓋螺紋區下方的活載閥桿填料、不可旋轉閥桿、工作壓力至 6000 psig（413 bar）、溫度 -73°C 至 648°C，閥體為 316 SS、Alloy 400 或 Alloy C-276，填料為 PTFE、PEEK 或石墨。選型取決於依介質危害選擇阻塞排放或單純隔離、填料材料對管線溫度，以及端接組合（NPT、承插焊、外螺紋管或廠商卡套端）。通用資料補充工作原理（以錐形螺紋針逐漸開啟小孔實現低流量微調）、細螺紋閥桿手緊關斷、直通與角式流道、硬化不可旋轉針桿實現無洩漏關斷、各填料材質的溫度上限（通用結構 PTFE 約 232°C、石墨填料約 343°C）、棒料與鍛造閥體、可更換閥座，以及泵調速器阻尼用途。
屬於 針閥 系列
最後更新： 2026-10
系列規格
| Service temperature range | -73°C to 648°C (-100 to 1200°F) |
|---|---|
| End connection types | NPT, tube socket weld, pipe socket weld, male pipe, Duolok tube ends, Griplok tube ends, Unilok tube ends |
| Valve body material | 316 SS, Alloy 400, Alloy C-276 |
| Packing Materials | PTFE, PEEK, Graphite |
| Pressure range (source-defined) | up to 6000 psig (413 bar) |
| stem types | Non-rotating vee, Soft seal (PCTFE), regulating, metering |
| working principle | Small port with a threaded, needle-shaped plunger; the tapered pin gradually opens the seat space for fine flow control |
| flow regulation character | Precise regulation of flow; generally only capable of relatively low flow rates |
| shut off effort | Shuts off completely with finger-tight stem pressure (fine-thread stem gives high mechanical advantage) |
| needle geometry | Long, tapered, needle-like point on the stem end acts as the disc; the stem needle passes through the seat orifice before seating |
| stem packing styles | O-ring with TFE backing rings, or TFE packing cylinder |
| body designs | Bar-stock body common; in globe-type builds a ball swivel on the stem provides rotation for seating without stem damage |
| replaceable seats | Often equipped with replaceable seats for ease of maintenance |
| pump governor application | Used on constant-pressure pump governors to damp discharge-pressure fluctuations |
| flow patterns | Straight and angle patterns |
| needle design | Hardened stainless steel non-rotating needle for leak-tight shutoff and long service life |
| packing temp limits | Up to 450°F (232°C) with PTFE packing; up to 650°F (343°C) with flexible-graphite packing |
| orifice size example | 0.31 in. (8.0 mm) orifice on a 3/4 in. general-utility execution |
| cv max example | Cv 1.2 maximum on the 3/4 in. general-utility execution |
| service scope | General-purpose service: isolate or vent system media |
範圍與來源備註
| packing temperature ceiling | Packing temperature ceiling: the referenced general-utility execution tops out at 650°F (343°C) with graphite packing, while the tenant envelope reaches 648°C (1200°F) - the tenant upper band relies on higher-temperature series/executions not covered by the referenced page. |
|---|---|
| flow capacity framing | Flow-capacity framing: generic references describe needle valves as low-flow fine-metering devices, while the referenced OEM general-utility series is positioned for isolation/vent duty with Cv up to 1.2 - metering vs isolation scope depends on execution. |
| stem packing split | Stem-packing split: generic two-style framing (O-ring/TFE cylinder) vs the tenant PTFE/PEEK/graphite live-loaded packing list - the referenced executions are simpler than the tenant high-pressure build. |
| body design | Body design: bar-stock construction is cited as the common generic design, but the tenant range also covers forged-body executions for high pressure - both exist across the family. |
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。
常見問題
儀表針閥（needle gauge）的報價詢問應包含哪些內容？
執行標準與壓力等級、公稱口徑、閥體與閥座材質、介質及溫度、目的地——缺失的資訊會在報價過程中確認。
儀表針閥（needle gauge）提供哪些口徑與壓力等級？
本頁面尚未公布該閥門經驗證的口徑與壓力等級範圍——適用於您工況的口徑與壓力等級會在報價過程中提出並確認。請在詢問時附上工況條件，選型結果會在報價中說明。
儀表針閥（needle gauge）提供哪些閥體材質？
本頁面尚未公布該閥門經驗證的閥體材質範圍——適用於您工況的閥體材質會在報價過程中提出並確認。請在詢問時附上工況條件，選型結果會在報價中說明。