ESD strictly uses a metal on metal fit to seal off the airflow. Metal on metal alleviates any concerns about rubber O rings drying out and becoming ineffective over time.
ESD Valves has the smoothest actuator in the industry. This small Manual Control valve works great on little diesel engines that need protection from external hydrocarbons.
There are many features about ESD Valves that can be customized. We machine each valve from billet aluminum in our Mori Seiki 9 axis machines to make changes quickly and easily.