Manual instrumentation ball valves are compact and rated for high-pressure applications and are suitable for control and measurement systems. They're used for collecting samples and installing flow-measuring devices and other instruments without shutting down the system. Manual valves open and close with a handle, which visually indicates whether the valve is open or closed depending on the handle's position relative to the valve body. Valve construction material is important to the intended application and must be chemically compatible with the system media. Always refer to the manufacturer's Chemical Compatibility guide. Two-way valves have one inlet port and one outlet port. Three-way have multiple inlet and outlet ports configured in different flow patterns (e.g., Y, T, or L) for mixing, splitting, or directing media flow.