What is a Safety Valve? 安全閥

“Simmer” is the phase just before a safety valve fully opens (pops), characterized by an audible or visible micro-discharge of fluid as system pressure approaches the set limit.

在系統壓力逼近設定壓力、但安全閥尚未「完全開啟」前，流體開始出現微量洩漏或發出聲響的階段，稱為「初噴」。

It typically occurs at approximately 3% below the set pressure.

其通常發生在設定壓力前的 3%。（數字待確認）

Set pressure is the predetermined pressure at which a safety valve is adjusted to open under operating conditions.

設定壓力是安全閥在運行條件下，被設定開始作動（開啟）的預定壓力值。

Every valve is strictly tested and set to meet customer-specific requirements before shipment, and is lead-sealed to prevent unauthorized adjustment.

每一顆安全閥出廠前，皆須依據客戶的實際需求，進行嚴格的測試與設定，並以鉛封確保數值不被隨意竄改。

“POP” refers to the rapid and sudden full opening of the safety valve disc when the system reaches the set pressure, overcoming the spring force. According to the ISO 4126 standard, the overpressure after full opening can reach 110% of the set pressure.

什麼是全開作動（POP）？ POP（或稱突開作動）是指當系統壓力達到設定點時，安全閥閥瓣克服彈簧壓力，瞬間且快速完全開啟的動作。依據 ISO 4126 規範定義，安全閥全開後的超壓（Overpressure）可達設定壓力的 110%。

Blowdown is the difference between the set pressure and the actual reseating pressure at which the safety valve disc returns to the seat and closes tightly after discharging. We set the reseating pressure of our safety valves at 15% below the set pressure.

回關（或稱啟閉壓差）是指安全閥在洩壓後，隨著系統壓力下降，閥瓣重新回到閥座並緊密關閉的過程。我們將安全閥的回關壓力設定在設定壓力的 -15%。

Static leakage (or seat leakage) refers to the minute escape of fluid between the valve seat and disc sealing surfaces when the safety valve is closed under normal operating pressure. Thanks to our mirror-grade turning technology, we have reduced unintended emissions by 35% (compared to the API 527 standard).

靜態洩漏是指在正常工作壓力下，安全閥處於關閉狀態時，流體從閥座與閥瓣密封面之間微量滲漏的現象。得益於我們的鏡面級車削技術，我們得以降低 35% 的無效排放（以 API 527 標準對比）。

Reducing micro-leakage minimizes physical erosion on the sealing surfaces, further prolonging the safety valve’s service life.

並且降低微量洩漏能減少對密封面的物理沖刷，進一步延長安全閥的使用壽命。