Manual valve in pneumatic systems that allows operators to control compressed air flow through manual operation. Available in lever-type, button-type, and rotary-type operation methods, used for emergency stops, manual switching during maintenance, and initial equipment setup. Unlike solenoid valves or automatic control valves, requires direct human operation and is essential for safety devices in production lines, emergency response, and pneumatic circuit isolation during equipment inspection. Features structures such as ball valves, gate valves, and needle valves, specifically designed for maintenance work on pneumatic equipment and manual control in emergency situations.