Equipped with filtering acid mist flame-proof device, more safe and reliable.
装备了过滤酸雾隔爆装置，更安全可靠。
2
For the actuators with pneumatic diaphragms or air cylinders the matching flame-proof type electric-gas valve positioner shall be provided together with the valve.
执行机构采用气动薄膜或气缸执行机构的，随阀提供配套隔爆型电？气阀门定位器。
3
By the theory of material mechanics, the stress situation of mining flame-proof electrical apparatus enclosure is analyzed, and the method of design is introduced.