FLUITEK ORSENIGO VALVES S.r.l.

This type of valve (also called “equilibrated disc non return valve”) is coupled with on-off valves in high pressure lines to protect the system from the fluid reversing flow, when regular flow is stopped. The characteristic of this valve is “non slamming”. The disc, with its shape, is maintained in the open position by the fluid flow and its return to closed position does not cause a sudden violent hit against the seat. Design can be to ASME B16.34 but, also, to EN 12516. Cast body construction and forged body construction are both available. Materials range from carbon steel to low alloy steel (including the widely used modified 9% Cr alloys) to austenitic stainless steels, to nickel alloys. Pressure classes (per ANSI standard) are normally ranging from 600# to 900#, 1500# and 2500#. Size range depends on pressure class requirements, FLUITEK ORSENIGO VALVES having no limits in relation to market requirements.

This type of valve, non-return, is coupled with on-off valves in high pressure lines to protect the system from the fluid reversing flow, when regular flow is stopped. The disc resistance to flow is keeping it open, a minimum flow rate being needed. FLUITEK ORSENIGO VALVES can supply, based on service conditions (fluid, temperature, pressure, flow rate) the analysis of the behavior of the valve and its limits. One of the limits of this type of valve is “slamming” to close position when fluid flow stops. FLUITEK ORSENIGO VALVES can supply counter weights, rotary dumpers (also called “dashpot systems”) to prevent “slamming”, all requiring the hinge mounted outside of the body. Design can be to ASME B16.34 but, also, to EN 12516. Cast body construction (both flanged and with butt weld ends) and forged body construction (with butt weld ends) are both available. Materials range from carbon steel to low alloy steel (including the widely used modified 9% Cr alloys) to austenitic stainless steels, to nickel alloys. Pressure classes (per ANSI standard) are normally ranging from 600# to 900#, 1500# and 2500#. 4500# class is also available in the forged body construction only. Size range depends on pressure class requirements, FLUITEK ORSENIGO VALVES having no limits in relation to market requirements.

FLUITEK ORSENIGO VALVES has a very long experience in supplying this type of non return valve. It’s the most used one by the industry, normally coupled with on-off bolted bonnet gate valves and globe valves. Most used standard of reference are API 6D, regular opening, API 594, BS 1868. EN and ISO standard can also be referred to. Constructions with internal hinge pin are available, together with the more traditional construction with hinge pin inserted from the side. The latter allows application of optional requests, such as position indicator (with or without limit switches), locking systems in the open position (to exclude the unidirectional non return function), anti-slam external counter weights. A rotary anti-slam system applied to the external part of the hinge pin is also available (industry calls it “dash pot system”). Materials available include carbon steel, low temperature carbon steel, low alloy steel, austenitic stainless steels, austenitic-ferritic duplex stainless steel, nickel alloys. ANSI classes normally available are 150#, 300# and 600#.

FLUITEK ORSENIGO VALVES has a very extended experience in supplying this type of valve for high pressure applications. The manufacturing features: fully guided disc in the body alternative shapes of disc (plug type, needle type, parabolic shape) swivel type stem-to-disc connection Are all deemed to allow adaptation to various service conditions, including throttling service. The Y-pattern fluid path shape helps to reduce fluid turbulence and consequent cavitation phenomenon. Design can be to ASME B16.34 but, also, to EN 12516. Cast body construction and forged body construction are both available. Materials range from carbon steel to low alloy steels (including the widely used 9% Cr alloys), to austenitic stainless steel, to nickel alloys. Packing systems are based on graphite material, but ceramic fiber yarn packing sets are also available for temperature exceeding 600°C. Materials are either to ASTM/ASME standards or to EN standards, either harmonized or calculated to design conditions. Pressure classes (per ASME standard) are normally ranging from 900# to 1500#, 2500# and 2500#. Class 4500# is also available but only in the forged body construction.

FLUITEK ORSENIGO VALVES has applied its extended experience in high pressure applications of gate valves to a line of small size (1/2” to 2”) forged construction specially designed gate valves. Standard of reference is API 602 / ISO 15761 and/or EN 12516. Materials are either the traditional ASTM/ASME materials, harmonized EN materials or special non-harmonized materials (ranging as usual from carbon steel, low temperature carbon steel, low alloy steel, austenitic stainless steel, austenitic-ferritic stainless steel, nickel alloys). Pressure classes are normally on the high range side (900#, 1500#, 2500#, 4500#). Construction is either with bolted bonnet, seal welded bonnet, full penetration welded bonnet, pressure seal bonnet (as below sketched). Dimensions are per specific design, depending on customer specifications. Compliance with AD2000 requirements is available.

FLUITEK ORSENIGO VALVES provides considerable experience in the production of gate valves for low temperature service (below -50°C). Low temperature test in accordance with BS 6364:1984 Appendix A is available. Standard materials are austenitic steels (e.g. CF8/CF3; CF8M/CF3M) with metal seals and /or soft inserts (usually based on PTFE). The implementation requires extremely accurate machining for a smooth functioning of the valve in service. A special kind of service is the oxygen service in the air liquefaction plants. For that application FLUITEK ORSENIGO VALVES has developed a procedure and a dedicated production shop. The valves are cleaned and treated in order to meet the industry requirements, with the capability of performing quantitative verification of the degree of cleanliness. The valves are supplied on request with mounting plate for installation in “cold box”. Equalizing systems are provided to prevent trapping of fluid in the body and bonnet estension cavities.

The most traditional, widely used, on-off valve FLUITEK ORSENIGO VALVES’s approach to manufacture this type of valve is to maintain high integrity of components, traceability, process controls and tests in order to supply a superior product to for particular customers demands. Specific attention is given to products in other than day-to-day used material, i.e. carbon steel. In particular: low temperature carbon and low alloy (nickel) steels, chrome-moly low alloy steels, austenitic and austenitic-ferritic duplex stainless steels, nickel alloys. Basic standard of reference is API 600, but also EN 12516 can be referred to. Materials are either to ASTM/ASME standards or to EN standards, either harmonized or calculated to design conditions. Pressure classes are normally ranging from 150# to 300# and 600#. Flanged or butt weld ends configurations are both available. Size range depends on pressure class requirements, FLUITEK ORSENIGO VALVES having no limits in relation to market requirements.