本公司生產的系列自力式氮封調節閥主要由控制閥門、執行 器、指揮器、壓力彈簧等部件組成。主要用于保持容器頂部保護 氣體(一般為氮氣)的壓力恒定，以避免容器內物料與空氣直接接 觸，防止物料揮發、被氧化，以及容器的安全。適用于各類大型 儲罐的氣封保護系統。 

Serial self-operated nitrogen seal regulating valve of the company is mainly composed of several parts including actuated valve， actuator， director and pressure spring.It is utilized to maintain constant pressure of protective gas(generally nitrogen) on the top of containers for avoiding direct contacts of containers and materials， preventing materials from vol at il izing and being oxidized and ensuring containers safeties.It applies to air seal protection systems of all kinds of large-scaled storage tank.