API · ASME · DIN · EN 標準工業閥門
洩壓/持壓閥
洩壓/持壓閥守護上游壓力：常閉先導閥感測進水側管線，上游壓力低於先導設定時主閥保持關閉，超過設定時先導閥調節膜片腔使閥門開啟、洩放多餘流量並維持最低上游（持壓/背壓）水位。同一先導控制閥體可服務純洩壓、背壓與卸荷任務，且在上區與高需求下區之間的管線上，可阻止下區「搶奪」上區水量。響應具備水擊意識——快開、緩關——設定值在離散彈簧區間內於先導閥上調整。基準覆蓋為 500X 等級液壓膜片閥，DN20 至 DN800，PN1.0/1.6/2.5，球墨鑄鐵閥體配膜片執行與先導控制；標準彈性體的水服務溫度至約 82 degC。
屬於 減壓閥 系列
最後更新： 2026-10
系列規格
| Nominal valve connection size | DN20-DN800 |
|---|---|
| Pressure class / nominal rating designation | PN1.0, PN1.6, PN2.5 |
| Valve body material | Cast Iron, Ductile Iron, Carbon Steel, Stainless Steel |
| model designation | 500X pressure relief valve (water control valve line) |
| Connection (source-defined) | Flanged; per-size D/D1/D2 and bolt pattern tabulated for PN1.0, PN1.6 and PN2.5 |
| dimension tables | Face-to-face (L), face-to-centre (A/A1), height (H/H1) and flange dimensions tabulated per DN from 20 to 800 |
| diaphragm materials | EPDM, NBR |
| Disc Materials | Cast Iron, Ductile Iron, Carbon Steel, Stainless Steel |
| pilot valve materials | Stainless Steel, Brass |
| Operation / closure mode | Hydraulically operated, pilot-controlled, modulating |
| operating principle | A hydraulically operated, pilot-controlled modulating valve that maintains constant upstream (inlet) pressure within close limits; actuated by line pressure through a pilot control system. |
| functions supported | The same pilot-controlled body serves pressure relief, pressure sustaining, back pressure, or unloading functions in a bypass system. |
| zone protection | Installed between an upper zone and a lower area of heavy demand, the valve maintains desired upstream pressure to prevent "robbing" of the upper zone. |
| surge response | The valve opens fast to maintain steady line pressure but closes gradually to prevent surges; operation is fully automatic and pressure settings are easily changed. |
| pilot adjustment ranges | 0 to 75 psi, 20 to 105 psi, 20 to 200 psi, 100 to 300 psi |
| fluid temperature limit | Water service to 180 degF (approx. 82 degC) for the standard elastomer configuration. |
| vfd pump duty | Complements VFD pump control: controls the maximum system pressure when VFD-driven pumps run at minimum speed. |
| pilot setpoint behavior | The normally-closed pilot senses upstream pressure through a connection at the valve inlet; valve and pilot remain closed until inlet pressure exceeds the pilot setting, and the pilot modulates the diaphragm chamber pressure to hold the set-point. |
| low pressure failsafe | If upstream pressure falls below the set-point, the valve closes or modulates so the set-point is maintained; the valve ensures minimum upstream pressure for critical use. |
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
洩壓/持壓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。
洩壓/持壓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。
洩壓/持壓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。
此子類型的型號與結構
型號
洩壓及持壓閥
洩壓及持壓閥是減壓閥家族中守護上游壓力的先導控制版本：上游壓力高於設定點時保持關閉，並調節開啟以洩放流量、維持最低上游（持壓）水位，同一先導迴路亦可對抗水擊執行純洩壓任務。基準結構涵蓋法蘭 DN50 至 DN600，PN1.6/2.5/4.0，閥體與閥盤為鑄鐵、球墨鑄鐵、碳鋼或不鏽鋼，EPDM 或 NBR 膜片，SS3
查看規格 →型號
500X 洩壓閥
500X 洩壓閥是水控洩壓家族的液壓操作、膜片執行版本：先導閥感測上游壓力並調節主膜片閥在設定點洩放多餘壓力，在多餘流量排放時維持上游（持壓）水位，在可服務純洩壓任務的同一閥體內保護泵與上游幹線免於超壓。基準結構涵蓋 DN20 至 DN800，法蘭尺寸在 PN1.0、PN1.6 與 PN2.5 下列表，依來源頁安裝於水
查看規格 →