Soft start-up valves enable the user to set the initial rate of system pressurization to minimize system shock. When deactivated, the valve quickly exhausts the system air pressure and isolates the supply. Models are available with a lock-out capability that permits safe servicing of the equipment once the pneumatic supply has been shut off.  A red button on a safety yellow body aids in identifying the valve as a pneumatic disconnect and provides for the use of a lock-out tag.