What is the impact of reducing the weight of the spool in a lift-type check valve?
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It is suspected that the low amount of water used for temperature reduction is due to the check valve not being able to open fully when cooling water is used in the boiler superheater; what problems could arise if the weight of the valve element in the lift-type check valve located in the cooling water pipeline of the boiler superheater is reduced?
It only affects the opening pressure of the valve; generally, standards for check valves do not specify any requirements in this regard, with only axial flow check valves having restrictions on the opening pressure.
Could it affect thermal expansion and thus cause sticking?
The check valves used for cooling water are usually not large; moreover, with such valves, as long as the diameter is 1/4 of the required size, the flow can be at full capacity. It seems there might be some issue with the valve. Reducing the weight of the valve core isn’t the main focus; I guess it’s to increase the tolerances in order to account for thermal expansion and contraction