Everyone, please help me understand the working principle of this cut-off valve

This can only be achieved by combining the valve diagrams for each individual component, linking them together in stages to form a complete control process, and drawing it out; this is the only way to learn it. Understand the principle of each individual solenoid valve and pneumatic valve. First, understand the part related to the instrument air supply; on that basis, it’s time to deal with the solenoid valves. Finally, there is the actuator with the cylinder. You might as well give it a try.

The image is a bit blurry; it’s not easy to see clearly. It’s better to teach someone how to fish rather than giving them fish. To explain my approach briefly: I start by looking at the air supply inlet; once I find the filter pressure regulator, I’ve essentially located it. Then I follow the pipes – the thicker pipes represent the power air (as defined by me as the air supply used to drive cylinders), while the thinner pipes represent the control air (as defined by me as a smaller air supply used to control the larger air supply). The ultimate result is that the two exhaust pipelines at each end of the cylinder enter the cylinder to enable valve operation. All the components in between (solenoids, pneumatic actuators, valve positioners, etc.) serve the process requirements; a position holding valve is added to ensure position retention, and one is added as well to achieve rapid opening or closing. Following this line of thought, it becomes clear what the air circuit on the valve is used for. Don’t know the process conditions? (Check the instrument data sheet; assemblage drawings need to be prepared upon completion of this project.) There is usually an electronic version.)

The small pipes are not visible, making it difficult to analyze

It is best to provide the manufacturer’s air circuit diagram; it is usually included in the handover documents

This post was last edited by imysm on 2019-8-14 at 15:50. Were the photos not taken in their entirety? There should also be a air storage tank; it’s likely a double-acting pneumatic gate valve with valve position protection (which allows switching to the air storage tank for supply when air pressure is too low). There’s also a manual air inflation pump, along with a circuit switching balance device that enables manual operation of the valve.

The KOSO 400H pneumatic double-plate parallel gate valve features a parallel double-plate design. It requires more thrust compared to spring-loaded double-plate valves, but its advantage lies in the ability to achieve a high level of sealing performance in both high and low pressure conditions, along with no jamming and tight sealing； The valve shown is equipped with a double-acting actuator accompanied by a hydraulic handwheel. The actuator consists of two cylinders connected in series, one above the other, and it provides high output force ； The attachment consists of a pressure reducing valve with filtering function, solenoid valves, a 2-position 5-way control valve, 2 two-position 3-way control valves, a lockout valve, and an air storage tank ； The on/off of the valve is achieved by reversing a two-position five-way solenoid-controlled valve using a solenoid valve ； The lockout valve detects the pressure of the gas supply at the site to determine whether there is a fault ；

I really guessed right; it’s indeed a control valve from Wuxi Industrial Equipment. Generally used on lava coolers or larger reactors. There’s nothing special about bipolar valves