A Globe valve is a linear valve and is primarily designed to isolate or start flow. Shut-off is accomplished by moving the disc against the flow stream rather than across it as in the case with a gate valve. Globe valves normally have a slightly higher pressure drops than straight through valves (e.g., gate, plug, ball, etc.), they may be used where the pressure drop through the valve is not a controlling factor. Globe valve is considered uni-directional and must be installed with the pressure side or inlet under the seat.