R983032394 2FRM6A36-2X/1.5QRV-IN001 Rexroth speed control valve made in Germany

R983032394 2FRM6A36-2X/1.5QRV-IN001 — Proportional Pressure-Compensated Flow Control Valve (Sandwich Plate, FKM Seals)

FAQ — Frequently Asked Questions

Q1: What is the difference between "A" and "B" versions of 2FRM6?

A:​

• 2FRM6A…​ = Throttling in A → A₁​ direction (meter-in control when valve is between directional valve and subplate on Port A). Free return A₁ → A via check valve.

• 2FRM6B…​ = Throttling in B → B₁​ direction (meter-in on Port B).

  Choose based on which actuator line you want to control. For bidirectional speed control, two valves (one A + one B) are typically stacked.

Q2: Why does this valve need an external drain (Y port)?

A:​ The integrated pressure compensator (which keeps ∆P across the orifice constant) requires a zero-backpressure drain to tank (Y port)​ to sense and balance correctly. If the Y line is blocked or sees backpressure, the compensator will malfunction and flow will become unstable. Run Y directly to the tank reservoir.

Q3: How accurate is the flow vs. a simple needle throttle (Z2FS6)?

A:​ Unlike the Z2FS needle valve (which is notpressure-compensated), the 2FRM6 has a pressure compensator​ that maintains a constant pressure drop across the orifice. This means the set flow stays nearly constant despite load-induced pressure fluctuations on P or A — ideal for consistent cylinder speed control. Accuracy is typically ±3–5% of set flow within rated ∆P.

Q4: The valve is set for 0.03–1.5 L/min — can it be used for higher flows?

A:​ No.​ The "1.5Q"​ code fixes the maximum flow at 1.5 L/min. For higher flows (e.g. 6 L/min, 16 L/min), select a 2FRM6 with a different Q-code (e.g. /6Q, /16Q). Oversizing the flow range reduces fine-adjustment resolution — match the Q-range to your application.

Q5: Why FKM (Viton) seals and what if I use mineral oil only?

A:​ The V suffix = FKM seals, required for:

• Higher temperature service (up to +80°C)

• Water glycol (HFC)​ or phosphate ester (HFD)​ fluids

  For mineral oil only at ≤70°C, an NBR-sealed version is acceptable and slightly lower cost. The FKM version (this part R983032394) gives broader fluid compatibility and higher temp rating.