What type of control valve is this?

It’s just a regular control valve with a position switch and solenoid valve; perhaps its installation location is such that the valve body isn’t visible, making it impossible to determine its type

What the arrow in the picture indicates is an explosion-proof flexible tube.

Are there 220V wires inside?

Is this control valve regulated by both gas control and electric control?

The solenoid valve has an actuator with a large grinding element, which is not visible in the image. There is also an air purity gauge on the upper part, indicating that it is a pneumatic valve. However, what is connected to the bottom of the actuator does not resemble a traditional valve; it is likely a pneumatic control valve, though its valve body might be somewhat special

What the poster has seen and marked is a flexible tube; it is relatively thick because in addition to the control signal, this valve also has a position switch. As can be seen from the diagram, the air circuit board adjacent to it is quite complex, and there are two flexible tubes connected to it – it is likely a dual solenoid valve setup； From the air supply pipe on the air circuit board to the valve diaphragm, it can be confirmed that it is a pneumatic valve. No other power cables or similar connections were seen, which rules out the possibility of dual power operation via electricity and air pressure. Judging from the limited images available of the lower part of the valve actuator, it appears to be quite long; however, there are no cooling fins (at least not visible in the images). It’s likely that it’s used in low-temperature pipelines, but the temperature isn’t extremely low, as the lower part seems to be rusty and is not made of stainless steel.

Inside, there should be the valve position feedback signal wire and the solenoid valve power cable. In explosion-proof areas, DC24V is generally used; you can determine whether it is 24V or 220V by checking the voltage of the solenoid coil.

It’s not an electric valve; the explosion-proof flexible pipe is thick because it contains multi-core cables. It was also said upstairs that it’s a pneumatic valve, with valve position switch feedback as well as locator signals and interlock signals, which is why it’s quite thick

The last edit to this post was made by fjw3081585 on 2018-11-7 at 10:04. As can be seen from the diagram, two 1*2*1.5 cables from the valve position switch enter the explosion-proof junction box; there are also two G1/2 flexible hoses that enter the same junction box. It’s not clear where these go – it is assumed that one 1*2*1.5 cable comes from the solenoid valve and enters the junction box, while another 1*2*1.5 cable exits the junction box and goes into a galvanized protective tube leading to the 24V power supply in the cabinet room. The wire marked in your diagram should be the valve position switch signal; it travels via a DCS2*2*1.5 cable, through a G3/4-G3/4 flexible tube, into a galvanized steel pipe, and then to the DCS as a feedback signal. -------------------------------------Please ignore my weird words

Check the valve model, go to the official website or search online for the manual of that model of valve, and then compare it on site using that manual; this will give you a much clearer understanding