These valves, normally orientated at an angle of 45° (“Y-pattern”), are frequently employed in power generation plants, in the presence of superheated steam or feed water. They can also be installed in process lines (i.g. refining plants) for medium/ high pressures and temperatures. They work as non-return valves (so they can be compared to “lift piston check” valves) and can be locked close. They are normally supplied with a pressure seal bonnet and manual actuator, with exception to those when they are mounted on site that is difficult to reach (in this case the actuator is electric).
FLUITEK ORSENIGO VALVES has a great experience in the supply of these valves. Field application has shown potential functioning problems in relation to the fluid type and flow rate. As a consequence, FLUITEK ORSENIGO VALVES has adopted a computational system that allows to simulate valves fluidynamic behaviour and, if necessary, to modify the disc according to the operating conditions in order to optimise the functioning.
The operating pressures are normally high (classes 900, 1500 and 2500 ASME).
The available materials range from carbon steel to low-alloy steels and austenitic steels, both forged and cast (examples: A105/WCB, F22/WC9, F91/C12A, F92, F347/CF8C).
Several design alternatives to ASME standards are available: UNI EN 12516, with materials that can be PED harmonised or not (example: 15NiCuMoNb5 for medium temperatures and very high operating pressures, 600 bar).