The MARSILI Standard valves are divided in four main categories: bypass valves, non-return valves, antishock valves and valve groups. The bypass valves are used in line to bypass the tubing or the cylinders in case of emergency. The non-return valves can be installed both on along the tubing or directly on the components and are used to block the return of oil flow. The antishock valves are safety valves which are installed to avoid that eventual high pressures damage the tubing or components of the system. The valve groups can integrate various functions on the same valve.