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Xi'an Dinghua Electronics Co., Ltd
DHE-EH intelligent electro-hydraulic actuator: building a dual fortress of safety and efficiency for storage tanks!
Date: 2025-06-17Read: 2
In the field of industrial automation, actuators serve as the "power heart" of equipment, with electric, pneumatic, and electro-hydraulic actuators each having their own strengths. Electric actuators have high control accuracy but complex structure and slow response; Pneumatic actuators are safe and cost-effective, but they suffer from issues such as slow response and poor control accuracy.
The electro-hydraulic actuator cleverly integrates the simplicity of electric operation, powerful hydraulic power, and fast response, which can not only output greater thrust and control accuracy up to level 0.5, but also have high reliability and flexible configuration, making it the preferred solution under harsh working conditions.
National strategic reserve large storage tanks are mainly used to store flammable and explosive finished oil products, which have high risks. As a key control point of the storage tank, the tank root valve is the "safety gate" between the storage tank and the external pipeline system. Once the root valve of the tank malfunctions, it may cause medium leakage, leading to catastrophic accidents such as fire and explosion. Therefore, its reliability and response speed have become the core elements for the safe operation of the entire storage tank system.
Difficult problems and core requirements faced by customers
According to the engineer's in-depth understanding of the on-site working conditions, traditional electric actuators have exposed many problems when facing the complex working conditions of the root valve of a storage tank in a certain warehouse of the National Energy Storage Hunan Bureau
1. Insufficient thrust of traditional actuators
The diameter of the root valve of the storage tank in this enterprise is DN250, and the pipeline pressure is as high as 8MPa. Under such harsh working conditions, the thrust of traditional electric actuators is far from meeting the requirements.
In actual operation, valve opening and closing are difficult, and frequent jamming occurs, which not only seriously affects work efficiency but also increases the risk of equipment damage.
2. Delayed response to emergency shutdown
Traditional electric actuators have a response time exceeding 40 seconds during emergency shutdown (ESD) operations, which cannot meet user needs.
In the fast-paced security protection scenario, this means that in the event of an emergency, it is impossible to cut off the medium delivery in a timely manner, greatly increasing the risk of medium leakage, which may expand the scope of the accident and cause incalculable losses.
3. Failure to meet safety standards
The tank area belongs to Zone 1 explosive gas environment, which requires high explosion-proof performance of the actuator. However, the explosion-proof rating of traditional actuators' electrical components cannot meet the safety requirements of higher risk levels in the area.
After understanding the on-site working conditions for the first time, we clarified the core monitoring requirements with the user:
1. High torque: Control gate valve, valve diameter DN250, pipeline pressure 8MPa, requiring 32KN thrust;
2. Quick response: Emergency shutdown (ESD) action time<2s;
3. High reliability: operates year-round;
4 Strict safety standards: The actuator must meet IP68 protection level and Ex d IIC T4 explosion-proof certification, and also pass SIL3 safety certification to ensure the safe operation of the tank area.
Application site diagram of △ DHE-EH intelligent electro-hydraulic actuator
Application site diagram of △ DHE-EH intelligent electro-hydraulic actuator
In response to the above issues, our technical engineers strongly recommend users to use our DHE-EH intelligent electro-hydraulic actuator, which meets customer needs with a series of advanced technologies and functions.
Performance of DHE-EH intelligent electro-hydraulic actuator
Integrated structure:
Integrated structural design, with built-in power and oil source, built-in oil circuit, no risk of oil leakage, and easy installation.
■ Servo control system:
The pump control principle adopts a servo motor to directly switch the oil circuit forward and backward, with a compact structure, fast response, high accuracy, and low noise.
Multiple fault safety:
Control shutdown under normal conditions (DCS system); Control rapid shutdown in emergency situations (SIS system); Electromagnetic valve (power-off type) automatically and quickly shuts off; Automatic action and rapid shut-off of fire relief valve, etc
Segmented speed control:
Multi level speed setting, stable and efficient operation, effectively reducing water hammer effect and protecting valves.
■ No opening operation:
Parameter setting and debugging can be completed through magnetic induction or infrared remote control, without the need to open the cover, making it easy to use.
■ User friendly interface:
High brightness and low-temperature resistant OLED screen, suitable for various climates, displaying real-time information such as opening, pressure, temperature, and fault prompts.
Functional safety:
Produced according to the IEC61508 standard, reaching SIL3 level to enhance safety.
Diagnostic protection:
Equipped with fault diagnosis function, it can achieve temperature protection, locked rotor protection, stall protection, pressure protection, over torque/thrust and limit protection, etc.
Highly recognized and trusted by customers
From the following data, it can be clearly seen that the application of DHE-EH intelligent electro-hydraulic actuator has greatly improved the emergency cut-off response speed of the tank root valve by 95%, reached a higher risk level of explosion-proof, and achieved 12 months of operation, greatly improving reliability.
The DHE intelligent electro-hydraulic actuator has solved the problems of difficult opening and closing of the tank root valve and slow emergency shutdown response. The equipment operates stably and maintenance costs are significantly reduced, providing strong security for our safety. ”
The high recognition of our product by the relevant personnel also proves the performance of DHE intelligent electro-hydraulic actuators in practical applications.
The successful application of DHE intelligent electro-hydraulic actuator in a warehouse of China National Petroleum Reserves Corporation Hunan Branch provides an excellent example for the safe operation of storage tanks in the petrochemical industry.