V10 and V20 vane pumps: model code, ring sizes and how to choose
V10 and V20 are the two industrial single-pump platforms of our balanced vane pump family. The V10 covers the small flows (ring sizes 1 to 7), the V20 the larger ones (ring sizes 6 to 13). Both are fixed-displacement pumps for open circuits, and both are ordered with a code in which every position changes the pump you receive. This guide explains that code, the ring sizes behind it, and the two versions people most often mix up: the high-pressure V10H / V20H and the double V2010 / V2020.
The short version
- Ring size = rated flow in USgpm at 1200 r/min and 7 bar (100 psi). A V10 ring 5 delivers 5 USgpm, a V20 ring 13 delivers 13 USgpm.
- V10: ring sizes 1–7, displacement 3.3–22.8 cm³/r, up to 172 bar, speeds up to 4800 r/min.
- V20: ring sizes 6–13, displacement 19.5–42.4 cm³/r, up to 172 bar, speeds up to 3400 r/min.
- Maximum pressure falls as the ring size rises: 172 bar to ring 5 (V10) and ring 11 (V20), 152 bar at ring 6 / 12, 138 bar at ring 7 / 13.
- Need more than 200 bar? That is the V10H (207 bar) and V20H (204 bar).
- Two circuits from one shaft? That is the V2010 or V2020 double pump.
- Order by the complete nameplate code: mounting, ports, shaft and rotation all sit inside it.
How to read a V10 / V20 model code
A single-pump code reads from left to right as series, mounting, inlet, ring size, outlet, shaft, outlet position and design. Take V20 1S13S 62A11:
| Position | Value | Meaning |
|---|---|---|
| Series | V20 | V20 platform, industrial single pump |
| Mounting | 1 | SAE A, 3.25 in pilot (6 = SAE B, 4.00 in pilot) |
| Inlet | S | 1.625-12 UN O-ring boss (P = NPT, B = BSP, F = 2-bolt flange) |
| Ring size | 13 | 13 USgpm at 1200 r/min and 7 bar |
| Outlet | S | 1.0625-12 UN O-ring boss (P = NPT, R = 1.1875-12 UN) |
| Shaft | 62 | 9T spline (1 = straight key, 11 / 38 = spline) |
| Position | A | Outlet position A, B, C or D |
| Design | 11 | Design number of that platform (V10 uses 20) |
The same positions appear on a V10 code such as V10 1S7P 1C20: SAE A mounting, 1.3125-12 UN inlet, ring 7, 1/2 in NPT outlet, straight key shaft, outlet position C, design 20. On double pumps an extra group appears in the middle for the second section, and the mounting numbers follow the double-pump convention — 1 means SAE B (4.00 in), not SAE A.
Ring sizes and performance
V10 — ring sizes 1 to 7:
| Ring | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
|---|---|---|---|---|---|---|---|
| Displacement | 3.3 | 6.6 | 9.8 | 13.1 | 16.4 | 19.5 | 22.8 cm³/r |
| Max speed | 4800 | 4500 | 4000 | 3400 | 3200 | 3000 | 2800 rpm |
| Max pressure | 172 | 172 | 172 | 172 | 172 | 152 | 138 bar |
| Typical flow | 13.6 | 27.6 | 35.6 | 41.3 | 48.5 | 55.3 | 60.6 l/min |
| Max input power | 5.2 | 10.1 | 13.3 | 15.2 | 17.0 | 18.3 | 17.9 kW |
V20 — ring sizes 6 to 13 (there is no ring 1–5 and no ring 10):
| Ring | 6 | 7 | 8 | 9 | 11 | 12 | 13 |
|---|---|---|---|---|---|---|---|
| Displacement | 19.5 | 22.8 | 26.5 | 29.7 | 36.4 | 39.0 | 42.4 cm³/r |
| Max speed | 3400 | 3000 | 2800 | 2800 | 2500 | 2400 | 2400 rpm |
| Max pressure | 172 | 172 | 172 | 172 | 172 | 152 | 138 bar |
| Typical flow | 60.9 | 63.2 | 67.0 | 75.0 | 86.7 | 87.1 | 98.4 l/min |
| Max input power | 21.6 | 22.0 | 24.2 | 26.5 | 28.0 | 26.8 | 29.1 kW |
Both platforms are balanced designs: the radial hydraulic loads cancel inside the cartridge, so the shaft bearings only carry the drive load. That is why these pumps run quietly and keep their performance over a long service life.
High-pressure versions: V10H and V20H
If your circuit runs above the standard platform limit, the square-body high-pressure versions are the answer. The V10H covers ring sizes 1–7 (3.21–22.44 cm³/r) at a rated 207 bar (3000 psi) and speeds to 4800 r/min; the V20H covers ring sizes 5–13 (15.8–41.7 cm³/r) at 204 bar (3000 psi) and speeds to 3400 r/min. Both offer cover options such as priority valve, flow control and relief, and both must be derated when fire-resistant fluids are used (maximum 1800 r/min; water-glycol around 124 bar, water-oil emulsion around 103–109 bar, synthetic fluids around 138 bar).
Double pumps: V2010 and V2020
A double pump puts two cartridge sections on one shaft inside one housing, with one inlet and two outlets — two independent circuits, or one combined flow. The V2010 pairs a V20-class shaft-end section (rings 6–13) with a V10-class cover-end section (rings 1–7) and weighs about 13.6 kg; the V2020 uses V20-class sections at both ends (cover end without rings 12 and 13) and weighs about 15.9 kg. Both are ordered with a single combined code, so always quote the whole string.
Five things that go wrong when ordering
- Ring size is not displacement. Ring size is a flow class in USgpm at 1200 r/min and 7 bar; the displacement in cm³/r is a different number.
- Pressure and ring size are linked. A ring 7 V10 is a 138 bar pump, not a 172 bar pump.
- V20 has no ring 1–5 and no ring 10. Substituting a nearby size changes flow and shaft load.
- Double-pump mounting codes read differently. On a double pump, mounting 1 is SAE B (4.00 in), while on a single pump 1 is SAE A (3.25 in).
- Shaft and rotation matter. Straight key and spline shafts are not interchangeable, and left-hand rotation is a distinct code position.
Which one do you need?
Start from the flow your machine needs at its normal drive speed, then check the pressure the circuit actually holds. Up to about 23 l/min at 1200 r/min with pressures to 172 bar, the V10 range covers it; from roughly 20 to 42 cm³/r, the V20 takes over. Above 200 bar, move to the H versions. If the machine needs two separate flows, a double pump usually saves a whole pump station.
You can browse the platforms directly: V10 · V20 · V200 · VTM42 series, V10 single pumps, V20 single pumps, V2010 double pumps and V2020 double pumps.
Send us the nameplate code
The fastest way to get the right pump is to send the complete model code from the nameplate — every position is meaningful, and one wrong character changes the mounting, the ports or the shaft. Send us the code and we will confirm the replacement, including the ring size, port type and rotation, before you order. All units we ship are new aftermarket replacements, quality checked before dispatch.
