JRP compact long-stroke hydro-pneumatic booster cylinder — JiuRong
Compact Long-Stroke Series

JRP Compact Long-Stroke Hydro-Pneumatic Booster Cylinder

Long approach stroke. Less installation length.

The JRP places the pneumatic and hydraulic cylinders side by side instead of in-line — delivering a long approach stroke with high final force in a significantly shorter axial envelope. Designed for machines where vertical or horizontal mounting length is the limiting constraint.

1–40THigh-pressure output
Ø63–160Bore range (mm)
50–400Total stroke (mm)
25–45Cycles / min
Configure Your JRP View Dimensions
Why JRP

Why Choose the JRP Compact Long-Stroke Series?

The JRP is JiuRong's side-by-side hydro-pneumatic booster cylinder for machines that need a relatively long approach travel but cannot accommodate the axial installation length of a conventional in-line arrangement. By placing the pneumatic drive cylinder and hydraulic booster cylinder in parallel, the JRP delivers the same long approach stroke and high final force — in a package that is dramatically shorter along the stroke axis.

Conventional In-Line Cylinder

Air Oil Tank Booster Long axial installation length

Pneumatic cylinder, oil reservoir, and booster section stack end-to-end — total length grows with stroke.

JRP Side-by-Side Arrangement

Pneumatic Cylinder Hydraulic Booster Cylinder Shorter axial length — wider lateral profile

Cylinders run in parallel — axial envelope stays compact even at long strokes. Note: lateral width increases.

Compact Axial Envelope

Side-by-side cylinder arrangement reduces total length along the stroke axis — ideal when machine frame height or depth is fixed.

Long Approach Stroke

Total strokes from 50 to 400 mm — the pneumatic approach stage covers long distances quickly at low air consumption before the hydraulic power stroke engages.

High Final Force

1 to 40 tons of high-pressure output from standard 4–7 kgf/cm² (0.4–0.7 MPa) shop air — no hydraulic power unit required.

Fast Cycle Rate

25–45 cycles per minute with approach speeds up to 400 mm/s — the two-stage principle keeps air consumption low while maintaining productivity.

Double-Acting Return

Pneumatic return on both strokes ensures consistent, controlled retraction — no spring fatigue, reliable repeat positioning cycle after cycle.

Proven Two-Stage Principle

Same reliable pneumatic-approach / hydraulic-power-stroke technology as the JRA — just repackaged for constrained envelopes. VG68 anti-wear hydraulic fluid, 0–60°C operating range.

Operating Principle

How the JRP Works

The JRP uses the same two-stage hydro-pneumatic principle as the JRA — a fast low-force pneumatic approach followed by a short high-force hydraulic power stroke. The side-by-side arrangement does not change the operating logic; it only changes the package geometry. Below: the force-displacement profile, the four-step cycle, and the pneumatic circuit that controls it.

Force vs. Displacement Profile

0 Approach force Power force 0 Approach stroke (50–400 mm) Total Power stroke (5–20 mm) Pneumatic approach — fast, low force Hydraulic boost Workpiece contact Displacement → Force →

The long approach stage uses only compressed air for rapid traverse. On workpiece contact, the hydraulic booster engages for the final 5–20 mm at full tonnage.

Four-Step Cycle

  1. 01
    Pneumatic Approach

    Solenoid valve DT1 energizes. Shop air drives the piston down at high speed (up to 400 mm/s) with low force — covering the full approach stroke with minimal air consumption.

  2. 02
    Workpiece Contact

    The ram contacts the workpiece. Pneumatic force alone is insufficient for the operation — this is the trigger point for the hydraulic boost phase.

  3. 03
    Hydraulic Power Stroke

    Solenoid valve DT2 energizes. The booster piston pressurizes the hydraulic oil, multiplying force to the rated tonnage (1–40T) for the final 5–20 mm of travel.

  4. 04
    Pressure Release & Return

    DT2 de-energizes to release hydraulic pressure, then DT1 de-energizes. The double-acting pneumatic return retracts the ram to home position — ready for the next cycle.

Pneumatic Circuit Diagram

JRP pneumatic circuit diagram showing DT1 and DT2 solenoid valves, booster cylinder, and air-oil tank
DT1 — Approach / return solenoid valve
DT2 — Booster solenoid valve
Booster cylinder (side-by-side arrangement)
Air-over-oil tank
Air filter / regulator / lubricator (FRL)
Muffler / exhaust port
Specifications

Technical Specifications

Standard JRP series parameters. All models operate on standard shop air (4–7 kgf/cm²) and use VG68 anti-wear hydraulic fluid. Custom bore, stroke, and force configurations available on request.

Performance

High-pressure output force
1–40 tons (nominal)
Operating air pressure
4–7 kgf/cm² (0.4–0.7 MPa / 4–7 bar)
Bore diameter
Ø63 / 80 / 100 / 125 / 150 / 160 mm
Total stroke (approach)
50 / 100 / 150 / 200 / 300 / 400 mm
Power stroke (high-pressure)
5 / 10 / 15 / 20 mm
Cycle rate
25–45 cycles / min
Operating speed
50–400 mm/s
Operating temperature
0–60 °C

Construction

Actuation
Double-acting
Cylinder arrangement
Side-by-side (pneumatic + hydraulic in parallel)
Hydraulic fluid
VG68 anti-wear hydraulic oil
Hydraulic proof pressure
120 kgf/cm² (12 MPa)
Pneumatic proof pressure
30 kgf/cm² (3 MPa)
Mounting orientation
Vertical, rod-down (standard)
Rod treatment
Hardened & ground alloy steel, chrome plated
Seals
NBR / polyurethane, service-replaceable

Interface & Control

Air supply port
ZG3/8" – ZG1 1/2" (by model)
Control valves
Two 5/2-way solenoid valves (DT1, DT2)
Control voltage
DC 24 V (standard) / AC 220 V (optional)
Rod end thread
M30×1.5 – M100×3 (by model)
Position sensing
Magnetic reed / solid-state switches (optional)
Noise level
≤ 75 dB(A) at 1 m
Lubrication
Oil-mist lubricator in FRL unit
Compliance
ISO 6432 / ISO 15552 mounting patterns
Dimensions

Installation Dimensions

Standard JRP installation dimensions by bore size. Total length (N) varies with power stroke selection (5/10/15/20 mm). All dimensions in mm unless noted. Custom configurations available on request.

Ø63 mm
Ø80 mm
Ø100 mm
Ø125 mm
Ø150 mm
Ø160 mm

Ø63 mm Bore — All Tonnage Options

Tonnage ABCDE F (Air)G (Oil) HIJKL M (Thread) N (5mm)N (10mm)N (15mm)N (20mm) OP
5T 180 250 100 65 72 ZG3/8" ZG3/8" 100.5 50 75 35 22 M30x1.5 310 395 480 565 75 95
10T 160 200 100 65 72 ZG3/8" ZG3/8" 100.5 50 75 35 22 M30x1.5 330 406 482 558 75 95

N = total installed length at the selected power stroke (5/10/15/20 mm). All other dimensions are constant regardless of power stroke. Scroll horizontally to view all columns on small screens.

Ø80 mm Bore — All Tonnage Options

Tonnage ABCDE F (Air)G (Oil) HIJKL M (Thread) N (5mm)N (10mm)N (15mm)N (20mm) OP
5T 190 310 132 65 89 ZG3/8" ZG1/2" 125 50 75 35 25 M30x1.5 380 470 560 650 95 120
10T 190 275 118 65 89 ZG3/8" ZG1/2" 125 50 80 40 25 M30x1.5 415 510 605 700 95 120
15T 225 330 145 85 112 ZG1/2" ZG1/2" 159 85 110 60 35 M40x2 493 600 707 814 120 150

N = total installed length at the selected power stroke (5/10/15/20 mm). All other dimensions are constant regardless of power stroke. Scroll horizontally to view all columns on small screens.

Ø100 mm Bore — All Tonnage Options

Tonnage ABCDE F (Air)G (Oil) HIJKL M (Thread) N (5mm)N (10mm)N (15mm)N (20mm) OP
10T 235 375 170 95 127 ZG1/2" ZG3/4" 180 110 135 75 42 M42x2 598 720 842 964 140 180
15T 200 325 110 85 120 ZG1/2" ZG3/4" 169 85 110 60 35 M40x2 585 710 835 960 120 150
20T 290 400 190 110 157 ZG3/4" ZG1" 220 150 170 90 50 M56x2 710 855 1000 1145 175 220

N = total installed length at the selected power stroke (5/10/15/20 mm). All other dimensions are constant regardless of power stroke. Scroll horizontally to view all columns on small screens.

Ø125 mm Bore — All Tonnage Options

Tonnage ABCDE F (Air)G (Oil) HIJKL M (Thread) N (5mm)N (10mm)N (15mm)N (20mm) OP
10T 300 460 220 130 182 ZG3/4" ZG1" 257 160 220 120 70 M64x2 905 1090 1275 1460 240 300
15T 290 400 145 100 148 ZG1/2" ZG3/4" 201 110 150 80 45 M42x2 710 855 1000 1145 175 220
20T 300 490 240 140 203 ZG3/4" ZG1" 288 180 240 130 75 M64x2 970 1165 1360 1555 260 320

N = total installed length at the selected power stroke (5/10/15/20 mm). All other dimensions are constant regardless of power stroke. Scroll horizontally to view all columns on small screens.

Ø150 mm Bore — All Tonnage Options

Tonnage ABCDE F (Air)G (Oil) HIJKL M (Thread) N (5mm)N (10mm)N (15mm)N (20mm) OP
20T 360 570 290 175 254 ZG1" ZG1 1/4" 360 240 310 170 100 M80x3 1210 1450 1690 1930 340 420
30T 300 490 200 140 203 ZG3/4" ZG1" 288 180 240 130 75 M64x2 970 1165 1360 1555 260 320
40T 360 580 300 175 254 ZG1" ZG1 1/4" 360 240 310 170 100 M80x3 1280 1530 1780 2030 360 440

N = total installed length at the selected power stroke (5/10/15/20 mm). All other dimensions are constant regardless of power stroke. Scroll horizontally to view all columns on small screens.

Ø160 mm Bore — All Tonnage Options

Tonnage ABCDE F (Air)G (Oil) HIJKL M (Thread) N (5mm)N (10mm)N (15mm)N (20mm) OP
30T 390 660 340 195 284 ZG1 1/4" ZG1 1/2" 403 270 350 195 115 M90x3 1450 1730 2010 2290 400 510
40T 420 720 380 220 320 ZG1 1/2" ZG2" 455 310 400 225 130 M100x3 1650 1970 2290 2610 460 580

N = total installed length at the selected power stroke (5/10/15/20 mm). All other dimensions are constant regardless of power stroke. Scroll horizontally to view all columns on small screens.

Force Data

Theoretical Output Force vs. Air Pressure

Theoretical high-pressure output force in kgf at various supply pressures. Actual force varies with seal friction, back-pressure, and mechanical efficiency. For critical applications, apply a 0.85 derating factor or contact our engineering team.

Bore Nominal Force 4 kgf/cm² 5 kgf/cm² 6 kgf/cm² 7 kgf/cm²
Ø63 mm 5T 1,800 2,250 2,700 3,150
Ø63 mm 10T 3,600 4,500 5,400 6,300
Ø80 mm 5T 2,800 3,500 4,200 4,900
Ø80 mm 10T 5,600 7,000 8,400 9,800
Ø80 mm 15T 8,400 10,500 12,600 14,700
Ø100 mm 10T 4,500 5,625 6,750 7,875
Ø100 mm 15T 6,750 8,438 10,125 11,813
Ø100 mm 20T 9,000 11,250 13,500 15,750
Ø125 mm 10T 9,375 11,719 14,063 16,406
Ø125 mm 15T 14,063 17,578 21,094 24,609
Ø125 mm 20T 18,750 23,438 28,125 32,813
Ø150 mm 20T 12,000 15,000 18,000 21,000
Ø150 mm 30T 18,000 22,500 27,000 31,500
Ø150 mm 40T 24,000 30,000 36,000 42,000
Ø160 mm 30T 30,720 38,400 46,080 53,760
Ø160 mm 40T 40,960 51,200 61,440 71,680

Values are theoretical at 100% efficiency. 1 kgf = 9.807 N. Nominal force ratings are at 6 kgf/cm² supply pressure.

Compare

JRP vs. JRA vs. JRE

The choice between JRP, JRA, and JRE depends on your machine envelope, approach stroke length, and whether a pre-press stage is needed. All three deliver hydro-pneumatic force from standard shop air — the difference is packaging and operating mode.

JRP compact long-stroke hydro-pneumatic booster cylinder

JRP — Compact Long-Stroke

Side-by-side arrangement

  • Best for: Machines with limited axial length but available lateral width
  • Long approach stroke (50–400 mm) in a short package
  • Two-stage: pneumatic approach + hydraulic power stroke
  • 1–40T output, double-acting
  • Vertical mount, rod-down
JRA standard pre-press hydro-pneumatic cylinder

JRA — Standard Pre-Press

In-line arrangement

  • Best for: Machines with ample axial installation length
  • Same two-stage principle, conventional in-line geometry
  • Wider bore and tonnage range
  • 1–100T output, vertical or horizontal mount
  • Most cost-effective when envelope allows
JRE direct-acting hydro-pneumatic booster cylinder

JRE — Direct-Acting

Single-stage, no approach

  • Best for: Short-stroke pressing, riveting, marking
  • No pre-press / approach stage — direct hydraulic force
  • Single solenoid valve, simpler circuit
  • 1–13T output, 25–45 cycles/min
  • Most compact overall when no approach stroke needed
Selection Guide

How to Select a JRP

Follow these seven steps to configure the right JRP for your application. Our engineering team can review your requirements and confirm the selection.

  1. 1
    Check the Installation Envelope

    Measure the available axial length (along the stroke direction) and lateral width. The JRP is the right choice when axial length is constrained but lateral space is available. If axial length is not a constraint, the JRA may be more cost-effective.

  2. 2
    Determine Required Force

    Calculate the pressing, forming, or joining force your process requires. Select a nominal tonnage that provides at least 15% margin over the calculated requirement. Refer to the force table above for actual output at your shop air pressure.

  3. 3
    Choose Bore Size

    Bore determines the available tonnage options. Match the bore to your required force: Ø63 for 5–10T, Ø80 for 5–15T, Ø100 for 10–20T, Ø125 for 10–20T, Ø150 for 20–40T, Ø160 for 30–40T.

  4. 4
    Set Approach Stroke

    The total (approach) stroke covers the distance from home position to workpiece contact. Standard options: 50, 100, 150, 200, 300, 400 mm. Choose the shortest stroke that clears your tooling and workpiece — longer strokes increase the N dimension.

  5. 5
    Set Power Stroke

    The high-pressure power stroke is the final 5–20 mm where full tonnage is applied. Standard options: 5, 10, 15, 20 mm. This should be just enough to complete the forming, pressing, or joining operation — not the full travel distance.

  6. 6
    Verify Cycle Rate & Duty

    The JRP is rated for 25–45 cycles/min. If your application requires sustained high-cycle operation above 40 cycles/min, or continuous duty at maximum force, contact engineering for a high-cycle configuration review.

  7. 7
    Check Return Force & Mounting

    Confirm the double-acting pneumatic return can overcome any die spring or stripping force. Verify mounting bolt pattern and rod-end thread (M) match your tooling. Standard mount is vertical, rod-down.

Configure

Build Your JRP Model Number

Select your bore, tonnage, and strokes below. The model number updates automatically — use it when requesting a quote.

4567
Your Model Number JR-P-100-100-10L-15T
Estimated Output Force 0 kgf
Applications

Where the JRP Fits

The JRP is typically specified when the machine frame has a hard limit on cylinder length along the stroke axis but can accommodate the wider side-by-side profile. Common applications include:

Press Forming

Sheet metal bending, shallow drawing, and profile forming where the ram must travel to the die surface before applying high force — the long approach stroke reaches the workpiece, then the power stroke forms it.

Riveting & Clinching

Self-pierce riveting, solid rivet setting, and sheet-metal clinching. The approach stroke positions the tool, and the short high-force stroke sets the fastener — all within a compact head assembly.

Precision Assembly

Bearing insertion, bushing press-fit, dowel pin installation, and component joining where controlled approach speed prevents part damage before the high-force press-fit stroke.

Press Fitting & Insertion

Inserting threaded inserts, connectors, pins, and seals into housings. The long approach stroke clears fixturing; the power stroke delivers controlled insertion force.

Marking & Stamping

Metal stamping, part marking, and coining operations where the die must descend to the part surface before applying tons of force for a clean impression.

Custom Automation Equipment

Automated assembly lines, rotary index tables, and custom machinery where the cylinder must fit within a predefined head envelope — the JRP's shorter axial length simplifies machine design.

Engineering Review

Engineering Boundaries

The JRP is a robust and proven design, but the following conditions require engineering review before final selection. Contact our team with your application details — we will confirm suitability or recommend a modified configuration.

Lateral Loads / Side Force

The rod is designed for axial force only. Guide the tooling separately if the process applies lateral or offset loads to the ram.

Long Stroke + High Cycle Rate

Approach strokes above 200 mm combined with cycle rates above 35/min may require a high-cycle seal package and increased lubrication.

Non-Standard Mounting

Horizontal or angled mounting changes oil distribution and return dynamics. The standard JRP is designed for vertical, rod-down operation.

High-Temperature Environments

Ambient temperatures above 60°C require fluoroelastomer (FKM) seals and high-temperature hydraulic fluid.

Die Spring / Stripping Force

If the return stroke must overcome significant die spring or stripping force, verify the double-acting return capacity at your supply pressure.

Custom Stroke or Force

Strokes beyond 400 mm, force above 40T, or non-standard bore combinations are available as engineered specials — contact us with your requirements.

FAQ

Frequently Asked Questions

What is the difference between the JRP and a standard JRA cylinder?

The JRP and JRA use the same two-stage hydro-pneumatic principle and deliver the same force range. The difference is the physical arrangement: the JRA stacks the pneumatic cylinder, oil tank, and booster in-line, while the JRP places the pneumatic and hydraulic cylinders side by side. This makes the JRP significantly shorter along the stroke axis but wider laterally. Choose the JRP when axial installation length is constrained; choose the JRA when you have ample vertical or horizontal space and want the most cost-effective option.

Does the JRP require a hydraulic power unit?

No. Like all JiuRong hydro-pneumatic cylinders, the JRP operates entirely from standard compressed air at 4–7 kgf/cm² (0.4–0.7 MPa). The hydraulic oil is sealed inside the cylinder and pressurized by the pneumatic booster piston — no external hydraulic pump, hoses, or power unit is needed.

Can the JRP be mounted horizontally?

The standard JRP is designed for vertical, rod-down mounting. Horizontal or angled installation affects oil distribution and return dynamics. If your application requires non-vertical mounting, contact our engineering team — we can provide a modified configuration or recommend the JRAA (horizontal JRA variant) or JREB (horizontal JRE variant).

How do I choose between JRP and JRE?

Choose the JRE if your application has no approach stroke requirement — the tooling is already close to the workpiece and you only need a short, direct high-force stroke (up to 25 mm). Choose the JRP when you need a long approach stroke (50–400 mm) to reach the workpiece before applying force, but your machine has limited axial length. The JRE is simpler (single valve) and more compact overall; the JRP offers longer reach in a shorter package.

What maintenance does the JRP require?

Routine maintenance is minimal: keep the FRL (filter-regulator-lubricator) supplied with clean air and proper oil-mist lubrication, periodically inspect the air filter element, and check for external oil leaks. The VG68 hydraulic fluid is sealed for life under normal operation; seal replacement is recommended after approximately 2 million cycles or 2 years, whichever comes first. All seals are service-replaceable.

What information do you need to provide a quote?

To quote a JRP, we need: (1) required pressing force in tons, (2) total approach stroke in mm, (3) power stroke in mm, (4) available shop air pressure, (5) mounting orientation, (6) cycle rate (cycles per minute), and (7) application description. You can use the model builder above to generate a model number, then send it to us with your contact details.

Resources

Documentation & Support

2D / 3D CAD Models

Step, IGES, and DWG files for all bore and tonnage combinations.
Online Configurator

Build your model number and get an estimated output force in real time.
Engineering Support

Talk to our application engineers for selection review and custom solutions.

Need a Compact Long-Stroke Solution?

Send us your JRP model number and application details — our engineering team will confirm the selection and provide a quote within 24 hours.

Request a Quote Configure Your JRP