Title: Motorventiler til kjølebatterier 36.01 og .02 - VUE DN15-50.pdf
Other information regarding hydraulics and noise in systems The valves can be used in a low-noise environment. To prevent noise, the pressure differences ∆pmax listed below should not be exceeded. The pressure difference ∆pv is the maximum pressure that may act on the valve regardless of the stroke position, in order that the risk of cavitation and erosion is limited. These values are irrespective of the actuator force. Cavitation accelerates wear and causes noises. To prevent cavitation, the pres- sure differential on the valve should not exceed the value ∆pkrit: ∆pkrit = (p1 – pv) × 0.5 p1 = upstream pressure before the valve (bar) pv = steam pressure at operating temperature (bar) The calculation works with absolute pressure. For the spring return, the stated ∆ps values are also the permissible differential pressure up to which the actuator can guarantee that the valve is closed in the event of an incident. Because this is a quick-closing function with a “fast” stroke movement (using a spring), this value