What is the difference between solenoid valves and mechanical valves (hand-operated valves, hand-turn valves) in the gas line?

What is the difference between solenoid valves and mechanical valves (hand-operated valves, hand-operated valves) in the gas line?

The solenoid valve is electronically controlled and can complete remote control and complex automatic control actions in conjunction with the circuit.

Mechanical manual or foot-operated valves have a simple structure and are durable. However, because the valve body is installed around the operator, the pipeline is long and messy, and is only suitable for simple equipment.