Spring full-open safety valve acting as nitrogen sealing valve, with nozzle type valve seat, valve body separated from valve seat and enlarged outlet branch pipe. Due to its large opening height, its discharge capacity is high. At this opening height, the displacement of the medium passing through is determined by the sectional area of the valve seat channel rather than by the sectional area of the annular clearance of the valve disc opening. 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 jet beam are used.

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。

Therefore, achieving high discharge capacity also depends on: since the sectional area of the valve seat channel is not reduced due to the existence of the guide rib, the medium flow is smooth; There is no eddy current not only in the valve seat channel, but also in the annular gap where the valve disc opens. In addition, the channel sectional area of valve body and outlet branch pipe is large. Due to the high discharge capacity, the sectional area of the valve seat channel of the safety valve can be small, which makes 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 the normal safety valve structure, the valve seat is made into a nozzle separated from the valve body., Therefore, the closed seat is not affected by deformation. The thread clearance between the valve body and the nozzle shall be selected so that the nozzle can expand freely without being affected by the deformation of the valve body. For safety valves used under high temperature and high pressure, use "hot disc" and insert it into the disc seat. The size and material of the nozzle and the "thermal disc" should be properly selected to ensure that their thermal expansion is the same without 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 contact hot or dirty media, so that the safety valve is easy to open and reseat. The valve rod and valve disc are connected by hardened steel ball. This mechanism can ensure that the valve rod will not be affected by spring deflection and automatically align with the center, and can prevent the valve disc from being stuck.

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