Bill of Materials
All pneumatic ports standardized to G1/4 unless noted. Tubing is 6 mm OD / 4 mm ID throughout. FS 2026 rules: push-in fittings are allowed for ASB/EBS, but we prefer compression (union nut) fittings. Exception: the SDE5 sensor has an integrated QS-6 push-in port.
This BOM covers the validated design (parallel VPPM + EBS, merged by the OR valve, no series ASB isolation valve — see the design page). The ASB valve, its coil, and its connector are still listed below because we own them, but they are not part of the validated circuit (kept as spares).
The BOM follows the pneumatic path from compressor/tank to actuator.
Compressor & Tank
12V portable compressor with integrated 6 L tank. Fills the system and maintains pressure.
| Status | Part No. | Description | Link |
|---|---|---|---|
| Buy | — | VEVOR air compressor, 12V, 90-120 psi (6.2-8.3 bar), 6 L tank | VEVOR |
Tubing
| Status | Part No. | Description | Festo link |
|---|---|---|---|
| Buy | 197384 | PUN-H-6X1-BL tubing, 6 mm OD / 4 mm ID, blue (3 m) | Festo |
Datasheet (local): 197384datasheet.pdf
Pressure Sensor 1 (tank side, before regulator)
Monitors tank/supply pressure. Connects directly to tubing via integrated 6 mm push-in fitting. Max measurement range: 10 bar — no overpressure rating documented.
| Status | Part No. | Description | Festo link |
|---|---|---|---|
| Reuse | 567465 | SDE5-D10-NF-Q6E-V-M8 pressure sensor, 0-10 bar, 0-10V analog, M8 connector, QS-6 push-in | Festo |
Datasheet (local): 567465datasheet.pdf
Warning: This sensor is rated 0-10 bar. The tank side may see up to 8.3 bar (compressor max). If placed before the regulator, ensure supply pressure stays within 10 bar or the sensor may be damaged.
Supply voltage — needs a boost from the 12 V rail (TODO). The SDE5 requires a 15–30 V DC supply (datasheet), but the kart runs a single 12 V rail (48 V → 12 V buck). Both SDE5 sensors therefore need a small step-up (boost) converter — planned, not yet fitted. The 0–10 V analog output is unaffected and feeds the ESP32 ADC as usual.
Manual Valve (brake release / isolation)
Manual valve for brake release during maintenance and system isolation. Reuse existing on-hand valve.
| Status | Part No. | Description | Notes |
|---|---|---|---|
| Reuse | — | Manual valve, G1/4 | On-hand from previous seasons |
Low-Pressure Regulator
Adjustable regulator to set maximum system working pressure downstream of the tank. Updated to D7 variant for higher output range (0.5-12 bar vs D6's 0.5-10 bar).
| Status | Part No. | Description | Festo link |
|---|---|---|---|
| Buy | 527690 | MS4-LR-1/4-D7-AD10 pressure regulator, G1/4, 0.5-12 bar | Festo |
Datasheet (local): 527690datasheet.pdf
Note: The D7-AD10 subtype is selected within the same Festo product page as the D6 variant. The D6 maxes out at 7 bar (confirmed on unit label: p2 max 7 bar / 105 psi), which is too low for our system. The D7 extends output to 0.5-12 bar — there is no intermediate variant capping at 10 bar.
Warning — max system pressure is 10 bar. The D7 regulator can output up to 12 bar, but all downstream components are rated at 10 bar or below (VUVS valves: 10 bar, SDE5 sensors: 10 bar, ADN-S actuator: 10 bar, VPPM inlet: 11 bar). Never set the regulator above 10 bar or downstream components may be damaged. There is no MS4-LR variant that caps at exactly 10 bar (D6 = 7 bar, D7 = 12 bar), so operational discipline or a downstream relief valve is required.
Pressure Sensor 2 (regulated side, before valves)
Monitors regulated pressure entering the valve stage. Same model as sensor 1.
| Status | Part No. | Description | Festo link |
|---|---|---|---|
| Buy | 567465 | SDE5-D10-NF-Q6E-V-M8 (second unit) | Festo |
Datasheet (local): 567465datasheet.pdf
EBS Electrovalve (emergency braking)
Normally-open solenoid valve. When powered (driving): closed. When unpowered (emergency): opens and delivers full supply pressure to the actuator. Max operating pressure: 10 bar (2.5-10 bar range).
| Status | Part No. | Description | Festo link |
|---|---|---|---|
| Reuse | 8035174 | VUVS-LT25-M32U-MD-G14-F8, 3/2-way, Normally Open, G1/4, 2.5-10 bar | Festo |
| 575488 | Datasheet (local) | (matches VUVS-L25-M32U-MD-G14-F8) |
ASB Electrovalve (VPPM supply isolation) — not in validated circuit
Normally-closed solenoid valve that would sit in series before the VPPM to cut its supply on power loss. Removed from the validated design — the VPPM blocks all ports when unpowered and the OR valve already isolates the branch, so this valve is redundant (see Why no isolation valve in series with the proportional valve). We own the part; kept as a spare. Max operating pressure: 10 bar (2.5-10 bar range).
| Status | Part No. | Description | Festo link |
|---|---|---|---|
| Spare | 8035167 | VUVS-LT25-M32C-MD-G14-F8, 3/2-way, Normally Closed, G1/4, 2.5-10 bar | Festo |
VPPM Proportional Valve (ASB)
Proportionally controls brake pressure during autonomous driving. All ports blocked when unpowered (see VPPM analysis). Max inlet pressure: 11 bar (port 1). Output regulation range: 0-10 bar.
| Status | Part No. | Description | Festo link |
|---|---|---|---|
| Buy | 571293 | VPPM-8L-L-1-G14-0L10H-V1P-S1C1, 0-10 bar output, max 11 bar inlet, 0-10V setpoint, G1/4 | Festo |
| VPPM catalog documentation (local) | online | ||
| Part-specific datasheet (local) | online |
Shuttle Valve (OR valve)
Ball-type shuttle valve that merges the EBS and VPPM output lines. Whichever side has higher pressure pushes the ball to seal the other port. Required — it stops the active branch from losing its air through the inactive branch's open exhaust (see Why the OR / shuttle valve is required).
| Status | Part No. | Description | Festo link |
|---|---|---|---|
| Buy | 6682 | OS-1/4-B shuttle valve, G1/4 | Festo |
Pneumatic Actuator
Spring-return cylinder. G1/8 ports — requires G1/4 → G1/8 adapter. Max operating pressure: 10 bar (0.4-10 bar for 50mm bore).
| Status | Part No. | Description | Festo link |
|---|---|---|---|
| Reuse | 8084714 | ADN-S-50-45-I-P-A, bore 50 mm, stroke 45 mm, G1/8, 0.4-10 bar | Festo |
Datasheet (local): adn-s-enus.pdf
Compression Fittings
| Status | Part No. | Qty | Description | Festo link |
|---|---|---|---|---|
| Buy | 2029 | ~15 | CK-1/4-PK-4 straight, G1/4 → tube 6 mm (all valve ports, NPFC-T ports, and general connections) | Festo |
| Buy | 8030236 | 2 | NPFC-T-3G14-F threaded T-adapter, 3× G1/4 female (split to parallel valves + merge outputs). Each port needs a CK-1/4 fitting. | Festo |
| Buy | 4469 | 1 | LCK-1/8-PK-4 elbow, G1/8 → tube 6 mm (actuator connection) | Festo |
| Buy | — | 1 | G1/4 female → G1/8 male adapter (actuator port) | TODO: find part number |
Note: CK-1/4 qty increased from ~10 to ~15. The 6 extra fittings are for the NPFC-T threaded ports (3 ports × 2 T-adapters = 6 CK fittings).
Change: TCK-1/4-PK-4 (4487) replaced by NPFC-T-3G14-F (8030236). The TCK was a push-in T-fitting; the NPFC-T is a threaded T-adapter that accepts CK compression fittings at each port, giving a more secure connection.
Datasheets (local):
Silencers
On exhaust ports of all valves and the actuator exhaust.
| Status | Part No. | Qty | Description | Festo link |
|---|---|---|---|---|
| Buy | 2316 | 2 | U-1/4 silencer, G1/4 (EBS valve exhaust + VPPM exhaust) | Festo |
| Buy | 2307 | 1 | U-1/8 silencer, G1/8 (actuator exhaust port) | Festo |
Datasheet (local): 2316datasheet.pdf
Cables & Connectors
| Status | Part No. | Qty | Description | Festo link |
|---|---|---|---|---|
| Buy | 542256 | 1 | NEBU-M12W8-K-2-N-LE8, M12 8-pin shielded cable (VPPM control) | Festo |
| Check | 541333 | 2 | NEBU-M8G3-K-2.5-LE3, M8 3-pin cable (pressure sensors) | Festo |
| Reuse | 8030810 | 1 | EBS valve coil VACF-B-C1-5, 12 V DC / 3.4 W, connector form C (EN 175301-803) | Festo |
| Buy | 151687 | 1 | MSSD-EB connector (form C) for the EBS coil | Festo |
| Spare | 8030801 | 1 | ASB valve coil VACF-B-B2-5, 12 V DC / 3.4 W, connector form B (DIN, 11 mm). Only needed if the spare ASB valve is fitted | Festo |
Coil compatibility (12 V supply). Both VUVS-LT25 coils are electrically identical — 12 V DC, 3.4 W (≈0.28 A), insulation class H, IP65 — so both run directly off the kart's 12 V rail and are interchangeable electrically. They are not connector-interchangeable, though: the EBS coil (VACF-B-C1-5, 8030810) is form C and mates with the MSSD-EB (151687); the spare ASB coil (VACF-B-B2-5, 8030801) is form B (11 mm DIN) and needs its own form-B plug — an MSSD-EB will not fit it. The validated circuit uses only the EBS coil + MSSD-EB, so this only matters if the spare ASB valve is ever wired in.