Custom Hydraulic Rotary Unions for Excavators, Grapples, and Marine Reels
Begapunk manufactures custom hydraulic-oil rotary unions (rotary joints). Typical layout is 2 passages; custom work goes up to 12. We evaluate and manufacture up to 30 MPa (300 bar / ≈ 4350 psi). That figure is a custom ceiling, not a stock catalog rating and not a conversion of the pneumatic catalog.
Used on excavators, grapples, and marine reels
Excavators
Hydraulic-oil rotary unions for excavator duties. Send operating pressure and speed so we can review the envelope and passage count.
Log and timber grapples
Custom unions for log and timber grapple circuits. Typical work is 2-passage; we will confirm whether more passages are required.
Marine reel and coil-handling equipment
Hydraulic-oil rotary unions for marine reel and coil-handling machines. Indexed or oscillating motion is part of the first review.
How we review a hydraulic inquiry
Engineer to engineer. Start with operating pressure and speed; we will say what else is needed.
- 1
Send pressure and speed
Operating pressure in bar and psi or MPa, plus speed (RPM or indexed / oscillating).
- 2
Seal stack and passages
We size the carbon-fiber Glyd ring (PTFE slide ring) stack and the passage count: 2 typical, custom up to 12.
- 3
Ports, envelope, feasibility
We confirm ports, envelope, and whether the duty is feasible to manufacture.
- 4
MOQ 1, within 30 days
One piece is enough to start. Custom hydraulic is completed within 30 calendar days after payment. It is not the catalog pneumatic ≈20-day item.
Two different offers
Do not treat the drawing-listed 1 MPa catalog model as the excavator 30 MPa custom union.
Drawing-listed oil/water: BP-1P-0003
BP-1P-0003 is the published catalog model whose drawing lists air, oil, and water at its published 1 MPa / 500 RPM. Use that product page for published values. We do not restate a hydraulic catalog bar rating here, and this is not the excavator 30 MPa union.
High-pressure custom hydraulic
Hydraulic oil. Carbon-fiber Glyd ring (PTFE slide ring). Evaluate and manufacture up to 30 MPa (300 bar / ≈ 4350 psi). Typical 2 passages, custom up to 12. MOQ 1 piece. This is a custom ceiling, not a stock rating on every unit.
Factory behind the work
Custom hydraulic rotary unions are built at our Ningbo facility. See manufacturing and quality, and production inspection and leak testing.
The standard production leak test on catalog units is compressed air at 1.0 MPa. That is not a 30 MPa oil-pressure test. Hydraulic acceptance is written per order.
What to send
Lead with operating pressure and speed. Incomplete information is acceptable for the first inquiry.
| What you may have | What it helps us check |
|---|---|
| Operating pressure (bar and psi, or MPa) | Whether the duty is within the custom ceiling of 30 MPa (300 bar / ≈ 4350 psi) |
| Speed (RPM or indexed / oscillating) | Seal stack and whether continuous or intermittent motion is feasible |
| Medium, if not hydraulic oil | Whether the inquiry is still this hydraulic-oil path or needs a different review |
| Passage count (2 typical, up to 12 custom) | Circuit layout |
| Ports and envelope | Interface and housing |
Need a custom hydraulic rotary union?
Send operating pressure and speed. We review every hydraulic inquiry type: excavators, grapples, marine reels, and other hydraulic duties.
Hydraulic rotary union questions
Can you make hydraulic rotary unions?
Yes. Begapunk manufactures custom hydraulic-oil rotary unions. Typical layout is 2 passages; custom work goes up to 12. We evaluate and manufacture up to 30 MPa (300 bar / ≈ 4350 psi). That is a custom ceiling, not a stock rating on every unit.
Is this the air catalog?
No. The 16 published catalog models are almost all compressed air with PTFE/O-ring seals. Only the BP-1P-0003 drawing lists air/oil/water at its published 1 MPa / 500 RPM. That is a different offer from the 30 MPa custom hydraulic path.
What seal do you use for this custom hydraulic work?
A carbon-fiber Glyd ring (PTFE slide ring) on this custom hydraulic work.
What is the MOQ and lead time?
MOQ is 1 piece. Custom hydraulic is completed within 30 calendar days after payment. Catalog pneumatic remains about 20 days; custom hydraulic is not that 20-day item.
What do you need first?
Operating pressure (bar and psi or MPa) and speed (RPM or indexed / oscillating). A duty sheet or sketch is enough to start.
Do you only want certain industries?
No. We want every hydraulic inquiry type: excavators, log and timber grapples, marine reel and coil-handling equipment, and other hydraulic duties. Send the duty.