Anti-backpressure double-seal spring type safety valve

The utility model relates to an anti-backpressure double-seal spring type safety valve, which comprises a valve body, a valve seat, a valve clack, a recoil disc, a guide sleeve, a valve cover and a pressure setting device, when the valve clack is in a closed state, a middle cavity and an outlet cavity are isolated, and a medium in the outlet cavity is prevented from influencing the sealing specific pressure between a valve clack sealing surface and a valve seat sealing surface; the inconsistency between the setting pressure and the preset setting pressure is avoided, the valve is prevented from being opened in advance or lagged, and the beneficial effects that the setting pressure is accurate and stable and the like are achieved. 本实用新型涉及一种防背压双密封弹簧式安全阀，包括阀体、阀座、阀瓣、反冲盘、导向套、阀盖、压力整定装置，在阀瓣关闭状态下，隔离中腔与出口腔，防止出口腔介质影响阀瓣密封面与阀座密封面之间的密封比压，避免了整定压力与预设定的整定压力的不一致性，避免阀门提前开启或滞后开启，具有整定压力准确、稳定等优点。