Spring return manual ball valves on drain line in high-risk environment 

Draining hydrocarbon lines can be random and with a potential for high-risk. Traditionally the process is done by an operator who manually opens a drain valve and visually detects the transformation from water to oil and subsequently closes the valve. In case the valve is ‘forgotten’ in the open position, flow of hydrocarbon to the surrounding may pose a potential for high risk. In such applications using a fail-safe manual valve is mandatory.