R17 vs R19 Constant-Pressure Hose

Fifty-five bar and the burst ratio. On the same 9.3 to 10.1 mm inner diameter R17 is rated 22.5 MPa (225 bar) with 90.0 MPa burst, and R19 is rated 28.0 MPa (280 bar) with 56.0 MPa burst. The bend radius is 65 mm on both, so the routing does not change; what changes is whether you buy working pressure or burst margin.

Every code in the range carries the same working pressure, so bore size does not change the rating. R17 is 22.5 MPa from 8 mm to 16 mm and R19 is 28.0 MPa across its seven codes. A standard braided range does the opposite, falling from 250 bar at 5 mm to 40 bar at 2 inch.

The 10 mm code is rated 22.5 MPa working (225 bar, 3,263 psi) with 90.0 MPa (900 bar) minimum burst. Minimum bend radius is 65 mm, mass is 0.28 kg/m, and the inner diameter is held between 9.3 and 10.1 mm.

The 12.5 mm code is rated 22.5 MPa (225 bar, 3,263 psi) with 90.0 MPa burst, on an inner diameter of 12.3 to 13.5 mm. Bend radius is 90 mm and mass is 0.38 kg/m. R19 on the same inner diameter is 28.0 MPa at 90 mm but 0.59 kg/m.

R17 if every circuit sits at or below 225 bar, because one class then covers the whole fleet at 0.22 to 0.68 kg/m. If any machine runs between 225 and 280 bar, standardise on R19 instead: putting both in the store defeats the point of constant pressure.

Yes, and it is a good fit: 8 mm and 10 mm codes at 22.5 MPa with a 55 mm and 65 mm bend radius. A pilot line sees low flow and a fixed pressure, which is exactly the duty constant-pressure hose is built for.

That is what the table says: 28.0 MPa working against 56.0 MPa minimum burst, where R17 is 22.5 MPa against 90.0 MPa. A 2:1 ratio is a different design decision, not a defect, but it does mean R19 has less headroom above its rating, so pressure spikes on the circuit matter more.

Because 55 mm is the minimum on the smallest code, and both ranges are compact bodies with little spare wall. Lay the line out at 70 mm and it runs; clamp it at exactly 55 mm with a fitting at an angle and the bore ovalises on the first heat cycle.

YIBO, in Luohe, Henan, braids both constant-pressure ranges on the same line: R17 from 8 mm to 16 mm at 0.22 to 0.68 kg/m, R19 across seven codes to 1.45 kg/m. A distributor stocking both can take one shipment and one test record.

Price follows the body: R17 runs 0.22 kg/m at 8 mm to 0.68 kg/m at 16 mm, R19 runs 0.17 to 1.45 kg/m across its seven codes. Send bore, length, ends and destination and a firm figure comes back the same working day.