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下部填料針閥
下部填料針閥將閥桿填料置於閥桿螺紋下方，使潤滑劑保留在螺紋上、腐蝕或磨蝕介質遠離螺紋——較大流量儀表用途的確定關斷。產品範圍涵蓋工作壓力至 5000 psig、-40°C 至 232°C 服務，316 SS 閥體直通或角式、316 SS V 型閥桿或 PCTFE 軟密封尖端、孔徑至 0.562 in.、端接至 1 in.，流量高於典型儀表針閥。選型取決於相對 5000 psig 上限的流量增益，以及面板布局所需的卡套/管牙組合。多來源資料補充運行框架：閥桿螺紋下方的活載填料配不可旋轉閥桿以延長循環壽命與無洩漏關斷、與一體閥帽及苛刻工況產品線並列的專用 400 系列下部填料定位、錐銷漸進開啟實現精細流量控制、柱塞完全收回前顯著的節流阻抗、基於閥桿的調節、手輪圈數與流量直接對應的線性流量特性計量任務、每吋 40 牙的參考計量閥桿，以及通用 O 型環/TFE 與 TFE 填料缸型式。
屬於 針閥 系列
最後更新： 2026-10
系列規格
| End connection types | Duolok tube fitting, Unilok tube fitting, Griplok tube fitting, MNPT pipe fitting, FNPT pipe fitting, tube socket weld |
|---|---|
| Valve body material | 316 SS |
| Maximum allowable working pressure (MAWP) | Up to 5000 psig |
| Temperature (source-defined) | -40°C to 232°C (-40° to 450°F) |
| Maximum orifice diameter | up to 0.562 in. |
| end connection size max | up to 1 in. |
| stem tip | 316 SS V-Stem, PCTFE soft-seal |
| patterns | Straight, Angle |
| end connection sizes | 1/8 in. to 1 in. |
| packing below threads ref | All packed bonnets feature live-loaded packing below the stem threads and non-rotating stems for better cycle life, lower maintenance and leak-tight shut off even in severe service conditions. |
| series placement | Offered as a dedicated lower-packing series (400 Series) alongside integral-bonnet and severe-service needle valve lines |
| tapered pin principle | An instrument needle valve uses a tapered pin to gradually open a space for fine control of flow. |
| retract impedance | As the screw is turned and the plunger retracted, flow between the seat and the plunger is possible; however, until the plunger is completely retracted, the fluid flow is significantly impeded. |
| spindle control | The flow can be controlled and regulated with the use of a spindle. |
| metering fine control | Metering valves are used for extremely fine flow control. The thin disk or orifice allows for linear flow characteristics. |
| handwheel turns correlation | Therefore, the number of handwheel turns can be directly correlated to the amount of flow. |
| metering thread pitch ref | A typical metering valve has a stem with 40 threads per inch. |
| packing styles generic | Needle valves generally use one of two styles of stem packing: an O-ring with TFE backing rings or a TFE packing cylinder. |
| pump governor duty | Most constant pressure pump governors have needle valves to minimize the effects of fluctuations in pump discharge pressure. |
| combustion control duty | Needle valves are also used in some components of automatic combustion control systems where very precise flow regulation is necessary. |
| lower packing component ref | Reference integral-bonnet parts list carries lower packing as a numbered component (item 7) |
| packing gland component ref | Reference integral-bonnet parts list carries a packing gland in 316 SS (item 5) |
| packing springs component ref | Reference integral-bonnet parts list carries packing springs (item 4) |
| peer turns large bore | 3/4 in and 1 in executions open fully in as few as 3 turns. |
| peer quick open turns | A quick-open execution is fully open in as little as 1-3/4 turns. |
| peer gland preload lock | The packing gland uses a preload locking internal thread form that resists vibration, eliminating the need for a separate locking device. |
| peer stem lift seat life | Stem geometry lifts the stem off the seat more than 2X faster than conventional designs, reducing throttling and extending seat life. |
| peer high temp packing | Temperature capability extends through graphite packing to 800 °F and extended stuffing boxes to 1200 °F on the hot end and -423 °F on the cryogenic end. |
| peer nace option | Valves can be manufactured to meet NACE MR-01-75. |
| peer brass envelope | Brass executions (screwed-bonnet or integral-bonnet forms) are rated for pressures up to 3,000 PSI and temperatures to 350 °F. |
| peer ptfe gland rationale | PTFE gland packing is used for its chemical resistance, low coefficient of friction and wide temperature tolerance. |
| peer nitrogen test limit | Factory acceptance testing: nitrogen at 1000 psig (69 bar) with a maximum allowable leak rate of 0.1 SCCM. |
| peer shell test option | Hydrostatic shell test at 1.5 times the working pressure is available as an option. |
| peer barstock orifice body | High-pressure bar-stock executions use a 0.197 in (5.0 mm) orifice with 316 stainless steel or carbon steel bodies. |
| peer union bonnet envelope | Union-bonnet instrument line envelope: orifice 0.156-0.437 in (4-11 mm), flow coefficient 0.35-2.2, end connections 1/4-1 in (6-25 mm). |
範圍與來源備註
| packing scope | Packing scope: the reference statement covers all packed SSP bonnets with live-loaded packing below the stem threads, while the tenant page dedicates the term to the 400-series higher-flow instrumentation family - the reference phrasing is broader than the tenant family split. |
|---|---|
| thread pitch | Thread pitch: reference metering stems use 40 threads per inch as the typical pitch, while the tenant page states no stem thread pitch for its higher-flow line. |
| packing style | Packing style: the generic reference split of O-ring with TFE backing rings versus TFE packing cylinder does not map to the tenant V-stem/PCTFE soft-seal stem-tip framing - packing-system vocabulary differs between reference and tenant pages. |
| component inventory | Component inventory: the referenced integral-bonnet parts list includes lower packing, a lower gland and packing springs as separate components, while the tenant lower-packing page does not itemize its packing-stack components. |
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
下部填料針閥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。
下部填料針閥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。
下部填料針閥提供哪些閥體材質？
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。