One more question about the flow control orifice plate
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For heat pump pipelines, why are flow control orifice plates and valves (gate valves) used together in some cases, while in other cases only a valve is sufficient?
In my opinion, there may be three reasons for installing both flow control orifices and valves at the same time: 1. The pressure of the fluid in the heat pump is too high, or a significant drop in this pressure is not allowed. 2. The pressure or temperature of the pump body must not rise too rapidly. 3. The diameter of the heat pump pipe is too large.
As a supplement: 1. When draining some pipes, high pressure within the pipes causes significant noise during the drainage process; in such cases, flow control orifice plates are used. 2. When the minimum flow rate of the pump is greater than the flow rate required by the subsequent process, a minimum circulation loop needs to be established, and in this case a flow-limiting orifice plate can be used. 3. When a single pump supplies multiple devices, and some of these devices require a relatively low pressure, a flow-limiting orifice plate can be installed in this case. 4. A flow control orifice plate can be used when the heat pump is returning fluid.
1. When the pressure drop across a valve is insufficient, 2. a globe valve is needed to open and close it, while an orifice plate is used to reduce the pressure
Noise reduction, helps to reduce the pressure on the valve, I guess.