The ball valves are classified as “Pressure accessories” in the sense of PED Directive 2014/68/EU, Article 2, paragraph 5 and are subject of Article 4, paragraph 1, letter (c), of the same Directive. All the products range is suitable for use with refrigerant R744 (CO2), classified in Article 13, paragraph 1, letter (b), of PED Directive 2014/68/EU as part of Group 2, therefore not toxic, not inflammable and not explosive fluid and indicated in A1 Group of Annex E of standard EN 378-1.
The valves are specifically designed to guarantee maximum safety both during operation and during system stops. On the sphere, in addition to the main passage hole, there is a relief hole that prevents any pressure increase due to the volumetric expansion of possible liquid trapped inside the sphere when it is closed. The innovative design allows rotation of 180° the position of the relief hole which must always be towards the high-pressure side for an optimal seal guarantee. This solution allows maximum flexibility of use, thus simplifying both the system design phase and the maintenance operations. The valves are approved for use in all parts of the system with pressure values equal to or less than the maximum working pressure indicated, typically: the liquid line, suction line and gas bypass line.
The body and the chrome-plated sphere are manufactured in hot-forged brass EN 12420 – CW617N and the solder connections are in reinforced copper UNI EN 12735-1 – CuFe2P. The TIG welding of the body and the EPDM O-ring assembled on the spindle, assure the perfect seal of the valves, while the special modified PTFE gaskets around the ball, ensure low working torque. The design of ball valves permits the bidirectional flow of the refrigerant, the equilibrium of internal pressures when the valve is closed and prevents any risk of ejection of galvanized steel spindle. The groove is made of stainless steel.
The brazing of the valves to the system shall be done with a low melting point alloy. During this process do not point the flame directly towards the body keeping it cooled in order to avoid compromising the seal of the gaskets. Carefully follow all the steps described in the instructions; the drain hole must always be directed to the high-pressure side.