Pneumatic stop valve is used to natural gas

The utility model discloses a pneumatic stop valve is used to natural gas, belong to pneumatic stop valve technical field, it includes manual valve valve core group spare, the pneumatic valve subassembly, valve body and welded joint, an at least annular groove has been seted up on the valve rod periphery wall of manual valve valve core group spare, be provided with O type circle and first retaining ring in the annular groove, and the circle of the O type in the preferred pneumatic stop valve is metal O type circle, the retaining ring is the polytetrafluoroethylene retaining ring, and sealed piece seals the piece for polychlorotrifluoroethylene. The utility model discloses a pneumatic stop valve is used to natural gas, simple structure, it is rationally distributed, effectively promoted theleakproofness of pneumatic stop valve under low temperature high pressure operating mode, promoted the security of pneumatic stop valve greatly, enlarged the range of application of pneumatic stop valve. 本实用新型公开了种天然气用气动截止阀，属