1. The reliability of the switch-type actuator is still a little different from that of foreign products, and the failure rate is relatively high, and the user is not at ease;

2. The electric actuator with high torque and high speed is lacking, which can not meet the requirements of users;

3. The adjustment type actuator mainly has a certain gap with foreign countries in terms of control accuracy and reliability.

 

Pneumatic actuators do not have much difference on the body, mainly because of the large gap between the control components, solenoid valves, transmitters, latching valves and other components and diaphragm life; gas-liquid actuator domestic production The number of manufacturers is small, and the products of individual enterprises are better, but the quality stability and reliability of some enterprise products are different from those of foreign countries; the electro-hydraulic linkage actuators have almost no professional production in China. However, this product is only used in applications where fast switching is required, and the amount of use is extremely small.

 

In recent years, the domestic manufacturing organization's manufacturing capacity in R&D, processing and manufacturing, testing and testing has been significantly improved, the quality control level has been significantly improved, and the products of key enterprises have reached or are close to the advanced level of foreign countries. Some products have been gradually applied to super (super) ) Critical thermal power units and large petrochemical plants.

 

In terms of electric actuators, Changzhou Power Plant Auxiliary Machinery Factory Co., Ltd., Yangzhou Power Equipment Repair Factory, Yangzhou Hengchun Electronics Co., Ltd., Teflon Group Co., Ltd., Tianjin Ecotech Measurement and Control Technology Co., Ltd. and Shenzhen Nanfang General Electric Co., Ltd. Some electric actuators produced by companies and other companies have been used in super (super) critical thermal power units.

 

In terms of pneumatic actuators, there are few well-known domestic brands that specialize in the production of valve pneumatic actuators. The general pneumatic actuators are made by valve manufacturers. Shanghai Electric Power Repair General Factory Co., Ltd., Shanghai Wald Power Station Valve Co., Ltd., Shanghai Automation Instrument Seven Factory and other enterprises used self-made actuators for some pneumatic valves for super (super) critical thermal power units.

 

The application results show that the domestic valve actuator can basically meet the requirements of the safe and reliable operation of the thermal power unit, and has the conditions and capabilities for localization. At the same time, domestic valve actuators have also been widely used in nuclear power, metallurgy, water treatment and petroleum and petrochemical industries.