Rummel RWFR120: brass where a plastic body is not enough
The RWFR120 is a mechanical flow regulator that distributes mold temperature control water from a single manifold to several mold circuits in parallel and shows the flow of each circuit separately. What sets it apart from the plastic-bodied entry models is that all parts in contact with water are brass; this allows it to run with pressurized hot water up to 120 °C. It is preferred for technical parts produced with hot molds, in applications where the mold temperature rises above 90 °C for surface quality.
Circuit control: ball valve
Each circuit has a shut-off ball valve on its supply and return line. A ball valve is a fast and reliable element for closing or opening a circuit completely; during a mold change, or when a single circuit needs maintenance, the other circuits keep running. The individual flow indicators can be replaced quickly, and the unit is insensitive to pressure surges.
Measuring principle
The measuring tubes work on the variable area principle: the medium moves a float and the flow is read on the indicator. A spring returns the float to its starting position. The brochure recommends vertical mounting with flow from bottom to top; the same document also states that the spring return makes mounting independent of position. We recommend confirming the mounting direction together at the ordering stage.
The measuring accuracy is ±10% of the full-scale value; this precision is sufficient to catch imbalances between circuits and the loss of flow over time.
Two indicator types, seven measuring ranges
On the RWFR120 the measuring tube can be selected in two designs. In the sight glass tube the float is visible directly; in the closed tube with side indicator version the measuring tube is closed and the value is read on the indicator at the side. The two types have different measuring ranges:
| Indicator type | Measuring ranges |
|---|
| Closed tube with side indicator | 1–9 L/min · 2–14 L/min · 2.5–20 L/min · 3–45 L/min |
| Sight glass tube | 1–6 L/min · 2–10 L/min · 2–16 L/min |
The range should be selected so that the normal operating flow of the circuit falls in the middle zone of the indicator; a flow read at the bottom end is weak in both accuracy and visibility.
Body options
- Standard design: solid brass manifold bar
- Compact design: stainless steel manifold bar
- Bimetal thermometer for temperature indication
- 2 to 12 circuits
Technical data
| Feature | Value |
|---|
| Max. temperature | 120 °C |
| Max. operating pressure | 10/15 bar |
| Pressure loss | 0.02–0.3 bar |
| Measuring accuracy | ±10% of full-scale value |
| Manifold supply/return connection | 1" female thread |
| Mold supply/return connection | 1/2" female thread |
| Body, connections, float, nozzles | Brass MS58 |
| Seal | FKM |
| Number of circuits | 2–12 |
The brochure gives the operating pressure with two values, "max. 10/15 bar"; if your system pressure exceeds 10 bar, we clarify the version suited to the application at the quotation stage.
Contribution to the process
Because the circuits are measured individually, a blocked or scaled circuit is located exactly. Distributing from a manifold instead of hose bridges reduces pressure loss, increases the flow and lowers installation costs. If you need to go up to 160 °C, the RWFR160 is the next step; if you want electronic logging and alarms, the RWFR160 e-flow is.
