The use of pneumatic actuators and valve installation accuracy is closely related

The use of pneumatic actuators and valve installation accuracy is closely related pneumatic actuator and the valve installation precision is correct, directly affect the actuator safety operation and service life. Reasonable installation is at the center of the actuator shaft and valve lever must be absolutely coaxial, reasonable connection installation. The actuators and valve assembly before, valve torque measurement, should not exceed the required torque. After the assembly, pneumatic actuators and valve test at the same time, the valve pressure to seal pressure rating, actuators for air pressure. ～. MPa or by air pressure to meet the needs of users, the pneumatic actuators to switch two inlet air intake, observe the pneumatic valves open and close the case, there should be no pause, crawl phenomenon, should switch flexible rotation, should be repeated many times to test. Pneumatic actuators, pneumatic actuators are mainly divided into that of single and double action is single acting spring return type structure, the principle of double action is gas-off, external regulation generally choose double-acting pneumatic actuators. Manual actuators: manual actuators is to improve the current instability and manual control air pressure is insufficient, occurs when the air pressure and current special circumstances can't control current and pressure or installation and maintenance, the open hand feedback device, can be manually controlled rapidly. Electric valve actuators automatically detect power terminal access to the phase sequence of three-phase power supply, through the proper logic operations, to decide which one actuator operation incentive ac contactor, to ensure that motor through to correct phase sequence. If there is no automatic phase sequence adjustment function, may be due to the phase sequence connection errors and damage to the valve. With the function of automatic adjustment phase sequence, actuator power supply connection can not consider the phase sequence.