Internal structure diagram of pneumatic valve cylinder, animation of working principle of pneumatic valve cylinder

Internal structure diagram of pneumatic valve cylinder


The main types of cylinders now include GT cylinders, AT cylinders, AW cylinders, etc.
GT appeared earlier. AT is an improved version of GT and is now a mainstream product. It can be installed with ball valves without brackets. It is faster, more convenient and stronger than bracket installation. The 0° and 90° positions can be adjusted to facilitate the installation of various solenoid valves, travel switches, and handwheel mechanism accessories. AW cylinder is mainly used for large-diameter ball valves with large output force and adopts piston fork structure.





Internal structure diagram of pneumatic valve cylinder





AT cylinder manual


1. The cylinder body is made of extruded aluminum alloy, which has been hard-anodized. The inner surface is hard and made of low-friction material. The sliding bearing avoids direct contact between metals, has flexible rotation, low friction coefficient, and long service life.


2. Compact double-piston rack-and-pinion structure, precise meshing and constant output torque.


3. The bottom output shaft of the actuator has a round or double square mounting hole (in compliance with ISO.5211 standards). Users can choose according to their needs, and we can also customize it as required. The top and top holes of the output shaft and the air supply holes comply with NAMUR or VDI/VDE 3845 standards.


4. Provide installation of various devices and configuration interfaces such as solenoid valves, positioners, replyers, etc. according to user needs, all of which comply with VDI/VDE 3845 standards.


5. The same specifications include double-acting type and single-acting type (spring return). Each form has multiple specifications. Each specification has multiple models, such as: normally open type, normally closed type, single electric control, double electric control. , ordinary type, anti-riot type, etc.;the company's products are suitable for pipe valves in various working conditions such as water supply and drainage, heating, petroleum, chemical industry, smelting, papermaking, electric power, pharmaceuticals, food processing, ships, coal, building automation, etc. .


6. The rotation angle of the standard actuator can be adjusted from -5 to +5° from both ends of the cylinder.


7. AT type uses air pressure 4~7bar






Animation of working principle of pneumatic valve cylinder






Animation of working principle of pneumatic valve cylinder


Actuator selection and installation: When using a pneumatic actuator, first determine the torque of the valve and consider the pipeline medium;increase the safety value by 25% for water vapor or non-lubricated media;increase the safety value by 60% for non-lubricated dry gas media;for non-lubricated purposes Increase the safety value by 100% for granular powder media transported by gas;increase the safety value by 20% for clean, friction-free lubricating media, and then look for a double-acting or single-acting torque meter based on the working pressure of the air source to obtain accurate execution. device model. Whether the installation accuracy of pneumatic actuators and valves is correct directly affects the safe operation and service life of the actuators. Proper installation means that the central axis of the actuator and the valve stem must be absolutely coaxial and properly connected and installed. Before assembling the actuator and valve, the valve torque should be measured and it should not exceed the required torque. After assembly, the pneumatic actuator and the valve are tested at the same time, and the valve is pressurized to the rated sealing pressure. The actuator uses a gas source pressure of 0.4~0.7MPa or the gas source pressure required by the user. The two air inlets of the pneumatic actuator are Switch the air intake and observe the opening and closing of the pneumatic valve. There should be no pauses or crawling. The switch should rotate flexibly and multiple repeated tests should be carried out. to





Functions and uses of actuators and accessories:


1. Double-acting pneumatic actuator: two-position control of valve opening and closing.


2. Spring return type: When the circuit or gas line is cut off or fails, the valve automatically opens or closes.


3. Single electric control solenoid valve: When the power is supplied, the valve opens or closes;when the power is cut off, the valve closes or opens. (Explosion-proof type available).


4. Double electronically controlled solenoid valve: the valve opens when one coil is energized, and the valve closes when the other coil is energized. It has a memory function (explosion-proof type is available).


5. Limit switch transmitter: transmits the signal of the valve's switch position over a long distance (explosion-proof type available).


6. Electric positioner: According to the size of the current signal (standard 4-20mA), the medium flow rate of the valve is adjusted and controlled. (Explosion-proof type available).


7. Pneumatic setting