Model GF2GGT530110000
Gemels RF unidirectional flow regulator: an adjustable throttle in one direction with free flow through an integral check in the other. The unit photographed is item code GF2GGT530110000 — RF G 1, DN25, BSP female, carbon steel, rated 40 MPa (400 bar).
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The RF is what Gemels calls a check valve flow control: a needle throttle that meters flow in one direction and a poppet that lifts to pass full flow in the other. In practice it is fitted in a cylinder line to set the speed of the working stroke while leaving the return stroke unrestricted. The knurled knob sets the orifice against a graduated collar and is held by a locking screw; the check opens at a cracking pressure of 0.05 MPa (0.5 bar, 7.25 psi) in every size.
The body of the unit photographed is laser-marked GF2GGT530110000 and MADE IN ITALY. That 15-character string is Gemels' own item code and it appears verbatim in the RF datasheet against RF G 1: DN25, BSP parallel female ends to DIN/ISO 228, carbon steel body, weight 2 kg. The same valve in NPT to ASME B1.20.1 is item code GF2NNT530110000.
The RF series runs DN6 to DN40, that is G 1/4 to G 1 1/2 BSP or N 1/4 to N 1 1/2 NPT. DN6 to DN25 are rated 40 MPa (400 bar, 5800 psi) and DN32 and DN40 at 35 MPa (350 bar, 5075 psi). Rated flow rises with size from 25 L/min at DN6 to 300 L/min at DN40 — 150 L/min at the DN25 shown. Temperature range is −20 to +100 °C; the carbon steel body is galvanised. Specify size, thread family and the flow to be metered when ordering.
| Series | RF — Gemels 'check valve flow control', edition 21.3 |
|---|---|
| Item Code (unit photographed) | GF2GGT530110000 — RF G 1, DN25, carbon steel |
| Nominal Size (unit photographed) | DN25 (G 1) |
| End Connections | BSP parallel female to DIN/ISO 228 (GF2GGT… codes); NPT to ANSI/ASME B1.20.1 available as GF2NNT… codes |
| Maximum Working Pressure | 40 MPa (400 bar / 5800 psi) for DN6–DN25; 35 MPa (350 bar / 5075 psi) for DN32 and DN40 |
| Maximum Flow | 150 L/min at DN25 (the unit photographed). Series range: 25 L/min at DN6, 35 at DN10, 50 at DN13, 90 at DN20, 150 at DN25, 200 at DN32, 300 at DN40 |
| Cracking Pressure (check direction) | 0.05 MPa (0.50 bar / 7.25 psi), all sizes |
| Temperature Range | −20 to +100 °C |
| Body Material | Carbon steel |
| Surface Treatment | Galvanised |
| Series Size Range | DN6 to DN40 (G 1/4 to G 1 1/2 BSP, or N 1/4 to N 1 1/2 NPT) |
| Weight (unit photographed) | 2 kg (4.41 lb), RF G 1 |
