A spring fully open safety valve with nitrogen sealing function, with a nozzle type valve seat, a separate valve body from the valve seat, and an enlarged outlet branch pipe. Due to its large opening height, its emission capacity is relatively high. At this opening height, the displacement of the medium passing through is determined by the cross-sectional area of the valve seat channel rather than the cross-sectional area of the annular gap where the valve disc opens. In order to achieve a large opening height, both the principle of increasing the impact area of the medium and the principle of recoil action of the ejected flow beam were utilized.

所以能達到高排放能力還有賴于：由于閥座通道截面積沒有因導向筋的存在而縮小，因而介質流動暢通；不僅在閥座 通道中，而且在閥瓣打開的環狀間隙處都沒有渦流現象。除此而外，閥體和出口支管的通道截面積都較大。由于排放能力高，安全閥的閥座通道截面積可以較小，從而使閥門易于密封。

So achieving high emission capacity also depends on: because the cross-sectional area of the valve seat channel is not reduced due to the presence of guide ribs, the medium flow is smooth; There is no eddy current phenomenon not only in the valve seat channel, but also in the annular gap where the valve disc opens. In addition, the cross-sectional area of the valve body and outlet branch pipes is relatively large. Due to its high discharge capacity, the cross-sectional area of the seat channel of the safety valve can be smaller, making the valve easy to seal.

在通常的安全閥結構中，閥座做成與閥體分離的噴嘴形式。，所以悶座不受變形的影響。閥體與噴嘴之間的螺紋間隙的選擇應使得噴嘴能夠自由 膨脹而不受閥體變形的影響。對于在高溫高壓下使用的安全閥，采用"熱閥瓣"并將其嵌入到閥瓣座中。噴嘴和'熱閥瓣" 的尺寸和材料應選配得當，以使它們的熱膨脹相同，不發生相對位移。

In a typical safety valve structure, the valve seat is made into a nozzle form that separates from the valve body., So the stuffy seat is not affected by deformation. The selection of thread clearance between the valve body and nozzle should enable the nozzle to expand freely without being affected by valve body deformation. For safety valves used under high temperature and pressure, use a "hot valve disc" and embed it into the valve disc seat. The size and material of the nozzle and the 'thermal valve disc' should be appropriately selected to ensure that their thermal expansion is the same and there is no relative displacement.

閥瓣的導向套與閥體的連接為非剛性的，并且不接觸熱 的或臟的介質，從而使安全閥容易開啟和回座。閥桿和閥瓣之間通過淬火鋼球來聯接。這種機構能保證閥桿不受彈簧偏 斜的影響而自動對準，并且能防止閥瓣被卡住。

The connection between the guide sleeve of the valve disc and the valve body is non rigid and does not come into contact with hot or dirty media, making it easy for the safety valve to open and reseat. The valve stem and disc are connected by quenched steel balls. This mechanism can ensure that the valve stem is not affected by spring deflection and automatically aligns with the center, and can prevent the valve disc from getting stuck.

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