R983032410 2FRM6B36-2X/3QRV-IN001 Rexroth German made speed control valve
| Full Part Number | R983032410 (IN001 = individual inspection suffix) |
| Base Model | 2FRM 6 - B36 - 2X / 3QRV |
| Valve Type | 2-way throttle check valve with pressure compensator (flow control — constant flow despite pressure fluctuations) |
| Nominal Size (NG) | 6 — sandwich mounting per ISO 6263 / NG6 (DIN 24340 Form C) |
| Function | Adjustable orifice + pressure-compensated spool → constant flow A→B; free reverse flow B→A via check valve |
| Adjustment Type | B36 = Rotary knurled knob with scale & lock setscrew (hand-adjustable) |
| Component Series | 2X (series 20+, dimensionally interchangeable) |
| Max. Adjustable Flow | 3 L/min (fine metering — Q range typically 0.05-3 L/min) |
| Max. Operating Pressure | 315 bar (ports A & B) |
| Cracking Pressure (Reverse Check) | approx. 0.5 bar (standard free-return) |
| Mounting Pattern | NG6 sandwich (4× M5 bolts), between directional valve & subplate |
| Seal Material | NBR (standard, code V — for mineral oil HL/HLP, HFC) |
| Hydraulic Fluid | Mineral oil HL, HLP per DIN 51524; HFC (water-glycol); HLPD, HVLP, HVLPD |
| Fluid Temperature Range | -30 °C to +80 °C (NBR seals) |
| Viscosity Range | 10-800 mm²/s |
| Weight (approx.) | 1.22 kg |
| Body Material | Steel / cast iron, zinc-plated |
No. A simple needle valve lets flow vary with pressure difference. The 2FRM is pressure-compensated — the built-in compensator spool keeps the set flow essentially constant despite load or supply pressure changes (provided ≥~15 bar ΔP across compensator).
- B36 = NG6 sandwich, rotary knurled knob with scale (0-max reference) + locking setscrew — adjustable by hand.
- /3 = maximum adjustable flow = 3 L/min (fine-metering version; also available: /6, /10, /16, /25, /32).
- Q = flow controlled in A→B direction.
- R = free reverse flow B→A via check valve.
- V = NBR seals (standard).
Loosen the lock setscrew, turn the knurled knob clockwise to increase flow, counterclockwise to decrease. The knob has a relative scale — use a flow meter to correlate to actual L/min. Retighten the lock setscrew after setting.
As a sandwich (stackable) valve between a directional control valve and the NG6 subplate, same bolt pattern as ZDR/Z2FS sandwiches (4× M5). Observe the arrow on the valve body — A→B = controlled/metered flow, B→A = free return.
No — one direction is pressure-compensated metered flow (A→B), the opposite direction (B→A) is free return through the check valve (no flow control, minimal pressure drop ~0.5 bar). For bidirectional flow control use two 2FRM valves.
The pressure compensator typically needs min. ~15 bar differential pressure across the compensator to regulate properly. Supply pressure must exceed the highest load pressure + ~15-20 bar + line losses.
- Flow varies with load pressure: compensator spool stuck (contamination) — check oil filtration (ISO 4406 18/16/13 or better); or insufficient ΔP across compensator.
- No flow / very low at max knob: valve installed backwards, or compensator/spool jammed.
- Cannot reach set flow / unstable: partially clogged orifice (critical at low flows — fine filtration essential), cold-start high viscosity.
- Excessive heat: normal for flow controls — P_drop × Q = heat; ensure supply pressure isn't unnecessarily high.
NBR seals = mineral oil (HL/HLP) & HFC (water-glycol). For HEES/HETG biodegradable oils or HFD phosphate ester → specify FKM (Viton) seal variant.
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