閘閥 · 暗桿閘閥（non-rising stem）
BS 碳鋼暗桿（NRS）閘閥
BS 碳鋼暗桿閘閥是依 BS 5163 建造的彈性閥座楔形閘板暗桿（NRS）閘閥：閥桿旋轉但不上升，閥門開關時安裝高度不變——這是無頭部空間的埋地供水幹線的標準選擇。基準頁涵蓋 DN50 至 DN600，PN16 至 PN40，碳鋼閥體、EPDM 包覆閘板，法蘭依 EN 1092。
屬於 暗桿閘閥（non-rising stem） 系列
最後更新： 2026-11
規格
| Valve body material | Carbon Steel |
|---|---|
| Disc Materials | Carbon Steel + EPDM |
| Stem material | Stainless Steel, Inox |
| gasket materials | EPDM, Graphite |
| Bonnet material | Carbon Steel |
| Seat material | EPDM |
| Packing Materials | EPDM (O-ring) |
| Nominal valve connection size | DN50 to DN600 |
| Pressure class / nominal rating designation | PN16 to PN40 |
| Design standards | BS5163 |
| Face-to-face dimensional standard | BS5163 |
| Flange standards | EN1092 |
應用與選型指引
Choose this execution for buried or space-constrained water and utility lines on BS/EN standards: NRS means no rising stem above the handwheel, so a key or extension spindle works in a valve chamber. The EPDM-sealed wedge suits clean water and neutral media; for hydrocarbons or high temperature the elastomer seat is the limit and a metal-seated wedge execution is the alternative. Note the benchmark page declares PN16 to PN40 only, and no actuation options are listed on the source page - confirm actuated variants at quotation.
常見問題
What does NRS (non-rising stem) mean, and when does it matter?
In an NRS gate valve the stem rotates in place and the wedge travels along it inside the body, so nothing rises above the bonnet as the valve opens. That keeps the installed height constant - essential for buried service, valve chambers and tight plant rooms. The trade-off is that the open position is not visible from outside; a rising-stem execution is preferred where visual position indication matters.
Resilient-seated vs metal-seated gate valve for water lines?
A resilient-seated wedge (EPDM encapsulation on this benchmark page) closes with low torque and achieves bubble-tight shutoff in clean water at PN16 to PN40, which covers most distribution mains. Metal-seated wedges tolerate dirty, abrasive or hot media better but need higher torque and do not always seal bubble-tight. Match the seat to the medium and temperature first.
What information is needed to quote a BS NRS carbon steel gate valve?
Nominal diameter (DN50 to DN600 on the benchmark page), pressure rating (PN16 to PN40), flange standard (EN 1092 on the benchmark page), the medium and temperature, and whether the installation is buried (spindle extensions, valve-box interface) or above ground. State any actuation requirement explicitly - the source page lists manual execution only, so actuated variants must be confirmed at quotation.
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。