What is a pneumatic valve?
Pneumatic valve is a valve driven by compressed air. When purchasing pneumatic valves, only the specification, category and working pressure can meet the procurement requirements. It can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil products, liquid metal and radioactive media. It is not perfect in the current market economy environment. For the purpose of product competition, pneumatic valve manufacturers have carried out different innovations under the concept of unified design of pneumatic valves, forming their own enterprise standards and product personality. Therefore, it is very necessary to put forward technical requirements in detail when purchasing pneumatic valves and coordinate with manufacturers to reach a consensus as an annex to the pneumatic valve procurement contract. This type of valve shall be installed horizontally in the pipeline.
The pneumatic valve is a double-layer cylinder with pneumatic actuator, buffer mechanism, manual and protection mechanism. Due to the double-layer cylinder structure, the lifting force of the valve is doubled compared with the single cylinder pneumatic gate valve. This fundamentally solves the problem that some valve bodies of single cylinder pneumatic gate valves are wedged and cannot be opened.
Pneumatic flange ball valve
What is an electric valve?
The action force distance of electric valve is larger than that of ordinary valve. The opening and closing speed of electric valve can be adjusted. It has simple structure and easy maintenance. It can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil products, liquid metal and radioactive media. The traditional pneumatic valve is not easy to be damaged due to jamming due to the buffer characteristics of the gas itself, but there must be a gas source, and its control system is more complex than the electric valve. This type of valve shall be installed horizontally in the pipeline.
Electric valve is a kind of valve with linear motion. It is matched with Z-type multi rotation actuator, including switch type and intelligent type. This valve is easy to operate. It is a common opening and closing valve. It uses the up and down work of the ram to connect and shut off the fluid medium in the pipeline. It is widely used in electric power, metallurgy, petroleum, chemical industry, papermaking, sewage treatment and other departments.
Electric flange ball valve
Difference between electric valve and pneumatic valve
1. The action force distance of the pneumatic valve is larger than that of the electric valve. The opening and closing speed of the pneumatic valve can be adjusted. The structure is simple and easy to maintain. During the action process, it is not easy to be damaged due to jamming due to the buffer characteristics of the gas itself, but there must be a gas source, and its control system is also more complex than that of the electric valve. Pneumatic valves are sensitive, safe and reliable. Many factories with high control requirements set compressed air stations for pneumatic instrument control elements. The power source of the pneumatic valve actuator is the air source, which comes from the air compressor. The positioner is used to convert the electric control signal into pneumatic control signal to drive the pneumatic actuator for valve position adjustment.
2. The power source of the electric valve actuator is the power supply. If the circuit board or motor fails, sparks are easy to occur, so it is generally used in occasions with low environmental requirements and no danger. Compared with the regulation performance of the pneumatic actuator and the electric actuator, the pneumatic actuator has faster response speed and can be more suitable for regulation conditions, Therefore, the manufacturers of regulating valves also produce pneumatic actuators to match them.
3. The adjustment response speed of the electric actuator is not fast enough, and the pneumatic actuator on the control valve is more applied than the electric actuator.
4. The essential difference between electric valves and pneumatic valves lies in the use of different driving devices, that is, actuators, while there is no difference between the regulating valve itself. Matching with different actuators is mainly required by working conditions, such as chemical industry and other occasions requiring explosion-proof. Pneumatic valves are mostly used because of high safety requirements and low price. They can be connected to the bus with intelligent positioner, and the control mode is also simple.