5, plug valve: refers to the closing parts into a plunger shaped rotary valve, through 90° rotation to make the valve plug on the channel opening and valve body opening or separate, to open or close a valve. Plug can be cylindrical or conical in shape. Its principle is basically similar to ball valve, ball valve is developed on the basis of plug valve, it is mainly used for oilfield exploitation, but also used in petrochemical industry.
6, safety valve: refers to the pressure vessel, equipment or pipeline, as the overpressure protection device. When the pressure rise in the equipment, container or pipeline exceeds the allowable value, the valve automatically opens, and then full discharge, to prevent the equipment, container or pipeline and pressure continue to rise; When the pressure is reduced to the specified value, the valve should be automatically closed in time to protect the safe operation of equipment, container or pipeline.

Nortech is one of the leading industrial valve manufacturers in China with quality certification ISO9001.

Major products: Butterfly Valve, Ball Valve,Gate Valve, Check Valve, Globe Vavlve,Y-Strainers, Electric Acurator , Pneumatic Acurators .

 For more interest, welcom to contact  at: Email: sales@nortech-v.com