Why the capacity position is a flow, not a displacement
Most vane pumps are chosen by displacement in cm³/r. The 50V is not one of them: its capacity position carries a flow in USgpm — 72, 85, 100 or 109 — and no displacement figure appears anywhere in the string. That one fact decides how the remaining seven positions have to be read, and it is the first thing to check on the nameplate.
The pump itself is a single-cartridge design: an inlet cover and an outlet body with one cartridge between them, and the cartridge lifts out as a unit together with its ring, vanes, rotor and wear plate — so a worn pump is renewed by changing the cartridge, not the whole unit. Three construction details follow from that build. The cartridge carries ten vanes and ten inner vanes. The ring is what changes from one capacity to the next, while the rotor is common to all four sizes. And the capacity itself is catalogued in USgpm — the unit this series is ordered in, 72, 85, 100 or 109.
Note that the number in the model code states a delivery in USgpm. The parts literature for this series carries no pressure or speed tables, so those figures come from the machine documentation rather than from the code.
The 8 positions at a glance
| # | Position | What it sets |
|---|---|---|
| 1 | Series | 50V — vane pump |
| 2 | Capacity | 72 · 85 · 100 · 109 USgpm |
| 3 | Port connections | A = 4-bolt flange on the inlet and on the outlet |
| 4 | Shaft | 1 straight keyed · 4 involute splined · 11 splined |
| 5 | Outlet position | A · B · C · D, read from the cover end |
| 6 | Design | Two digits; the listing covers designs 10 and 11 |
| 7 | Rotation | L for left hand; right-hand builds carry no letter, read from the shaft end |
| 8 | Special modifications | 103 without foot bracket · 132 with foot bracket |
A nameplate code reads as 50V109A 1D11 132: series 50V, capacity 109 USgpm, port A, shaft 1, outlet position D, design 11, right-hand rotation, special modification 132.
Capacity and port: positions 2 and 3
Position 2 carries the delivery the pump was ordered at, in USgpm: 72, 85, 100 or 109. It is a three-figure field on the larger sizes, so the model number is read from the left: everything up to the A belongs to the capacity.
Position 3 describes both connections at once. One code is listed for this series, A, a 4-bolt flange on the inlet and on the outlet, which is why the same letter appears in every 50V model number.
Shaft: position 4
Three shafts were offered, and the parts listing gives each its own shaft and key:
| Code | Shaft | Notes |
|---|---|---|
| 1 | Straight keyed | Supplied with its key |
| 4 | Involute splined | For drives that take a splined coupling |
| 11 | Splined | Straight-sided spline |
The shaft is one of the few parts that is not part of the cartridge, so it is identified separately on the nameplate — together with the outlet position and the design number.
Outlet position: position 5
One letter places the outlet in relation to the inlet, viewed from the cover end of the pump:
| Code | Outlet position, seen from the cover end |
|---|---|
| A | Opposite the inlet port |
| B | 90° counter-clockwise from the inlet port |
| C | Inline with the inlet port |
| D | 90° clockwise from the inlet port |
Because the inlet and the outlet are separate castings bolted to the cartridge, the pair of letters that places them decides how the pump pipes up in the machine — and a pump built for one position will not simply be rotated into another.
Design and rotation: positions 6 and 7
Position 6 is a two-digit design number. The parts listing for the series covers designs 10 and 11, and every 50V pump in our listings carries 11; a code ending in 10 identifies an earlier build of the same pump.
Position 7 gives the direction of rotation, read from the shaft end. The model form printed with the parts listing shows an L in that position for a left-hand pump (50V***A-**11L-13*), and the same listing’s model numbers end at the design number for right-hand builds — which is how the great majority of these pumps were ordered. Left-hand pumps are marked LH in our listings so the rotation is not lost when the code is quoted.
Special modifications: position 8
The last position records a modification made to the standard pump. Two are listed for this series:
| Code | Modification |
|---|---|
| 103 | Omit foot bracket |
| 132 | With foot bracket |
The foot bracket is a separate mounting item on this series, carried on the bracket-less and bracket-fitted builds respectively. A third value, 130, is seen on pumps in the field; it is not printed on the listing page that covers the other two, so it is confirmed from the pump itself when one is quoted.
What changes with capacity
Capacity is set inside the cartridge, and it is the ring that carries it. That shapes what has to be matched when a pump is replaced:
| Item | Changes with capacity? | What it means |
|---|---|---|
| Cartridge | Yes — renewed as a complete unit | The cartridge carries the capacity, so it is chosen by the capacity in position 2 |
| Ring | Yes — one per capacity | Four rings cover the four sizes |
| Rotor | No — one rotor for all four | A larger pump is not a larger rotor |
| Vanes | No — ten vanes plus ten inner vanes | The same vane set is used across the series |
| Seal kit | No — one kit for the series | The F3 seal option is listed separately for fire-resistant fluids |
Service figures that come with the pump
The parts listing also carries the figures needed to put a 50V back together, and they are worth keeping with the machine:
- Body screws: torque the four body screws to 250–270 lb·ft, with the threads oiled at assembly.
- Felt wiper: saturate the wiper with oil before assembly.
- Shaft seal: apply a small amount of grease to the inner circumference of the seal before the shaft goes in.
- Filtration: full-flow filtration to ISO cleanliness code 20/18/15 or cleaner, which the listing recommends as the condition for satisfactory component life.
50V parts are listed for 50V pumps
The cartridge, ring, shaft and seal kit for this series are listed under their own drawing and their own numbers, separate from the V and VQ series. A 50V takes 50V parts: the cartridge designs differ, and the rotor and vane set that make up a V cartridge are not the ones used here. When a pump is identified as a 50V, the parts are ordered against the 50V capacity and design number on the nameplate.
Five stock codes, decoded
| Code | How it reads |
|---|---|
| 50V72A 1A11 130 | 72 USgpm capacity; port A on inlet and outlet; shaft 1, straight keyed; outlet A, opposite the inlet; design 11; right-hand rotation; special modification 130 |
| 50V85A 1C11 130 | 85 USgpm; port A; straight keyed shaft; outlet C, inline with the inlet; design 11; right-hand rotation; modification 130 |
| 50V100A 1A11 130 | 100 USgpm; port A; straight keyed shaft; outlet A, opposite the inlet; design 11; right-hand rotation; modification 130 |
| 50V109A 1D11 132 | 109 USgpm; port A; straight keyed shaft; outlet D, 90° clockwise from the inlet; design 11; right-hand rotation; 132, built with the foot bracket |
| 50V109A 1A11 132 LH | 109 USgpm; port A; straight keyed shaft; outlet A, opposite the inlet; design 11; left-hand rotation; modification 132, with the foot bracket |
Five checks before you order a 50V
- Read position 2 as a flow. The figure there is a delivery in USgpm — 72, 85, 100 or 109 — and the series is catalogued in that unit.
- Order 50V parts by their own numbers. The cartridge, ring, shaft and seal kit are listed for this series separately, and the rotor and vane set differ from the V cartridge.
- Take capacity from the code, and pressure or speed from the machine documentation. The model number fixes capacity, port, shaft, outlet position, design, rotation and modification; the parts literature for this series carries no pressure or speed tables.
- Confirm whether a foot bracket is wanted — only the 132 build carries one, and the mounting differs without it.
- Quote the rotation together with the code. Right-hand is written without a letter and left-hand is marked, so give both when a pump is checked.
Ordering
Send the complete model number from the nameplate, or the code you need — capacity, shaft and outlet position — and we confirm the build before the order is placed. Where the nameplate is unreadable, photographs of the pump, the port end and the mounting foot, together with the machine model, are usually sufficient to place it.
All pumps are supplied as new replacement units, inspected individually before dispatch.
Browse the 50V vane pumps or the wider V, VQ and 50V series.
