規格
| body | Cast Iron, Ductile Iron, Carbon Steel, Stainless Steel |
|---|---|
| diaphragm | EPDM, NBR |
| disc | Cast Iron, Ductile Iron, Carbon Steel, Stainless Steel |
| pilot valve | Stainless Steel, Brass |
| spring | SS304 |
| shaft | SS304 |
| Working pressure (source-defined) | PN1.6, PN2.5, PN4.0 |
| dimensions size mm | 50-600 (50,65,80,100,125,150,200,250,300,350,400,450,500,600) |
| length l mm | 205-1230 per size |
| height h mm | 270-1370 per size |
| height h1 mm | 200-950 per size |
應用與選型指引
Select this execution where a minimum upstream pressure must be held while excess flow spills - pump discharge sustaining, zone back-pressure control, or surge relief on DN50 to DN600 mains. Confirm the working pressure class (PN1.6, PN2.5 or PN4.0) covers the worst upstream case, pick body and disc material against the medium, verify the diaphragm compound (EPDM or NBR) suits the fluid and temperature, and match the per-size face-to-face and height dimensions tabulated for the selected DN against the installed pipework envelope.
常見問題
How does a pressure relief and sustaining valve differ from a standard pressure reducing valve?
A reducing valve senses and holds a steady downstream pressure; a relief and sustaining valve senses upstream pressure, staying closed while upstream pressure is above set-point and modulating open to spill flow so the minimum upstream (sustaining) level is held. The same pilot-controlled main valve can therefore serve back-pressure sustaining duty and pure relief duty against surges.
Which materials are used in the pressure boundary and trim?
The benchmark page lists body and disc in cast iron, ductile iron, carbon steel or stainless steel, a diaphragm in EPDM or NBR, a pilot valve in stainless steel or brass, and SS304 for the spring and shaft. That spread lets the execution be matched to water duties across PN1.6, PN2.5 and PN4.0 systems from DN50 to DN600.
What information is needed to quote a pressure relief and sustaining valve?
Nominal size within DN50 to DN600, the working pressure class (PN1.6, PN2.5 or PN4.0) against the line rating, the upstream set-point to sustain or relieve, medium and temperature so the EPDM/NBR diaphragm and body material can be confirmed, and the per-size face-to-face (L), height (H/H1) envelope from the dimension table against the mating pipework.
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。