The Keystone 8865 is a double-acting pneumatic valve designed for use in a variety of industrial environments. It is typically used in applications from process valves, to clean room valves, to solenoid valves. The valve has two aluminum bodies, one for inlet and one for outlet, and two stainless steel control rods. It has a built-in safety latch and a fail-safe design to keep air pressure from exceeding maximum pressure rates and to protect downstream components. It includes an adjustable travel and pressure setting, a manual override and flow control option, and an external override port. It can also be used to monitor upstream and downstream pressure and position, as well as provide feedback signals to a control system.