本公司生产的系列自力式氮封调节阀主要由控制阀门、执行 器、指挥器、压力弹簧等部件组成。主要用于保持容器顶部保护 气体(一般为氮气)的压力恒定，以避免容器内物料与空气直接接 触，防止物料挥发、被氧化，以及容器的安全。适用于各类大型 储罐的气封保护系统。 

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.