Valves must be operated at pressure and temperature, set out in the table of technical characteristics. It is strictly forbidden to allow the working environment to freeze. inside the tap. When draining the system in winter, the valve must be left half-open so that the work environment does not remain in cavities behind the shutter. Ball valves are operated simultaneously with only one maximum parameter (pressure or temperature). Use product with simultaneous parameters is prohibited. After cleaning the filter element, the plug seal must be change to a new one, in order to avoid a loose connection.