Excess Flow Valves are an additional feature to be used in combination with bursting discs to protect a refrigeration system from overpressure.
The use of excess flow valves is recommended in accordance with fact sheet AD2000 A1 and ASME Boiler & Pressure Vessel Code VIII Div.1 (paragraphs UG 125 through UG 137) when bursting discs or relief valves are being used in series or in combination. Excess flow valves keep the space between safety valve and bursting disc pressureless in case smaller leaks occur. They prevent the build-up of counter pressure. They work with a ball that gets pushed into its seat, if an overpressure occurs, e. g. when the bursting disc opens, thus preventing ventilation and enabling the safety valves to perform as intended. Furthermore pressure manometers and controllers can be connected
Excess Flow Valves | |
material | stainless steel |
nominal size | appropriate for bursting discs DN 15-100 |
nominal pressure level | DN15-25: PS 25, 40, 63
DN 32-100: PS 40 |
temperature range | -60 °C to +150 °C |
temperature range for
HT Valve Series | -10 °C to +200 °C |
connection | to be connected to the bursting disc holder
via a G1/4″ or NPT1/4″ thread |
PR-OLEO® 优质氨制冷润滑油是高度精制的 2 阶段氢化裂解润滑剂,采用专门配方制成,可在采用往复式压缩机或螺杆压缩机的氨制冷系统中使用。
制冷系统的实用补充设备。氨干燥机可从制冷剂循环中除去水分,它与过滤器和放空气器一起成为氨制冷系统的完美补充。
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