平衡閥 · 雙調節平衡閥（DRV）
青銅雙調節閥 PN25
青銅雙調節閥以兩個步驟平衡水力迴路：手輪設定設計流量的精確開度，記憶止動鎖定該位置，閥門可關閉隔離後重新開啟至恰好平衡設定點。基準結構為 PN25 青銅閥體閥門，內螺紋對接端，飲用水接觸 WRAS 批准，手輪操作尺寸適合供暖與冷凍水系統中迴路級雙調節工作。
屬於 雙調節平衡閥（DRV） 系列
最後更新： 2026-11
規格
| weight | 0.5562kg |
|---|---|
| product finish | Bronze |
| size mm | 20 |
| valve type | Double Regulating Valve |
| model designation | D921 |
| Nominal valve connection size | DN15 to DN50 |
| Pressure Rating | PN25 |
| Service temperature range | 10 - 120°C |
| End connection types | Sizes 1" to 2" taper threaded, Sizes 1/2" & 3/4" DN15 & DN20 parallel threaded |
| thread standards | BS EN 10226-2 (ISO 7-1) formerly BS 21, BS EN ISO 228-1(formerly BS 2779) |
| measurement accuracy | accuracy of +/-5% on all settings |
| orifice design | integral fixed oriface design |
| Valve body material | Bronze |
| adaptor kits | Adaptor kits for use with copper tube also available |
| ansi thread option | Also available threaded to ANSI B1.20.1. Please add suffix AT to denote American Thread i.e. D921AT/D923AT |
應用與選型指引
Select this execution as the circuit-level static balancing and isolation point on heating, chilled water and potable-acceptable systems inside the PN25 envelope, wherever commissioning must set design flow once and later isolation must not lose that setting. Pair it with a flow measurement device at metering points, and size the valve so the balancing duty sits in the upper part of the handwheel travel for resolution and repeatability.
常見問題
What makes a double regulating valve different from a plain balancing valve?
The double regulating function couples the throttle to a memory stop: once the handwheel is set to design flow and locked, the valve can be fully closed for isolation and reopened to exactly the same setting. A plain throttle valve loses its setting at every closure, so recommissioning starts from zero.
Which materials, size and rating does this execution cover?
The benchmark product page lists a bronze body and finish, PN25 pressure rating, female-female threaded ends, a 20 mm size execution weighing about 0.5562 kg, handwheel operation, and WRAS approval supporting potable water contact.
What information is needed to quote a double regulating valve?
Line size and end connection (threaded or flanged per the circuit), design flow rate and the target pressure drop for balancing, system pressure class against PN25, medium and temperature against the bronze body, and any potable water requirement covered by the approval.
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。