Gas Ball Valve
Flowserve Naval Gas ball valves is designed for shut-off applications in natural gas pipelines. All valves fulfil the requirements of European Pressure directive (97/23/EY) and are manufactured to category lll.(module H). Flowserve Naval Oy has acertified quality system IS
Flowserve Naval Gas ball valves is designed for shut-off applications in natural gas pipelines. All valves fulfil the requirements of European Pressure directive (97/23/EY) and are manufactured to category lll.(module H). Flowserve Naval Oy has acertified quality system ISO 9001 and certified environmental management system ISO 14001. Naval gas valves can upon request be manufactured in accordance with the EU ATEX-directives (94/9/EC), equiment group ll. The Atex-requirement shall always be mentioned in the inquiry and order.
DESIGN: The valve has all-welded body and is fitted with carbonreinforced Teflon seals which are long-lasting againstfrequent operation, impurities and chemicals. A ground and polished stainless steel ball gives easy turning and reliable operation over many years. A floating ball construction is used. Bevel spring washers keep the seals pressed against the ball to ensure that the valve remains leak- tight regardless of pressure fluctuations. The blow-out proof stem is sealed with 2 O-rings. In smaller valves, the upper one can be changed and in sizes 65 to 300 both can be changed. The Teflon thrust washer between the stem shoulder and stem housing also acts as a seal. Stem housings of DN65 valves and above are fitted with stainless steel bearings.
CHARACTERISTICS: The valve needs no servicing - no adjustment or lubrication and is easy to install, long working life with low running costs. It is easy to insulate because of the long, circular stem housing. The operating lever is detachable and can be re-positioned at 180 degrees. Heavy and unreliable cast components are not used in the construction of the valve body. It is easy to retrofit actuating equipment.
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NAVAL Gas Ball Valve brochure
NAVAL Gas Ball Valve Pressure/ Temperature curves: Pressure resistance as a function of temperature
NAVAL Gas Ball Valves KV-Values technical brochure
NAVAL Gas Ball Valve Actuating Torque table
NAVAL Gas Ball Valve pressure loss diagram
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