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Whether in Alaska, Norway or Russia: Industrial valves, such as those used in chemical plants or the oil industry, are exposed to extreme cold as low as -55°C in some regions. However, not all industrial valves are suitable for operation in extreme cold. Three criteria are decisive.
Direct mount manifolds for direct mounting on pressure and differential pressure transmitters are normally protected against overheating by hot process media by means of correspondingly long impulse pipings. Nevertheless, many users demand that the manifolds and their flange connection to the transmitter can easily withstand even higher temperatures. For this, the manifolds must be equipped with gaskets made of graphite. This means they can easily be used at up to 550 degrees Celsius – much more than required by the current EN 61518 / IEC 61518 standards.
Our customers are often faced with the challenge of determining exactly the right valve/manifold application for extreme operating conditions. For process plants I can recommend the use of metal seated ball valves if abrasive products, high temperatures and pressures are present. Extreme operating conditions with temperatures up to 450 °C and pressures up to 420 bar require a special sealing technology for ball valves. Standard soft seated ball valves simply aren’t ready for this kind of requirements. Their plastic seats would fail.