Pneumatic actuator

• Main Authors: ZHANG KEWEN, WANG JIAHAO, SUN ANYUAN, YANG GANG, WANG YANGFENG
• Format: Patent
• Language: English
• Published: 25.02.2015
• Subjects: ACTUATING-FLOATS; BLASTING; COCKS; DEVICES FOR VENTING OR AERATING; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MECHANICAL ENGINEERING; TAPS; THERMAL INSULATION IN GENERAL; VALVES; WEAPONS

The utility model relates to an actuator, in particular to a pneumatic actuator used for controlling a valve. According to the technical scheme, the pneumatic actuator is characterized in that an air cylinder body, an air cylinder cover, a piston, compression springs, an upper valve rod and a lower valve rod are included, the air cylinder cover is connected in the air cylinder body in a screwed mode through threads, the piston is arranged in a cavity of the air cylinder cover, the upper valve rod is fixedly arranged on the upper side of the piston, the lower valve rod is fixedly arranged on the lower side of the piston, the compression springs are arranged in a containing cavity in one side of the piston, a pressurizing cavity is formed in the other side of the piston, a first through hole and a second through hole are formed in the air cylinder cover, the first through hole is directly communicated with the pressurizing cavity or the containing cavity, and the second through hole passes through a channel formed between the air cylinder cover and the air cylinder body and then is communicated with the containing cavity or the pressurizing cavity. By means of the scheme, the pneumatic actuator overcomes the defects existing in the prior art, and is good in structure and good in valve rod guidance quality.