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Custom Single Acting Hydraulic Cylinders
Single acting hydraulic cylinders generate hydraulic force in one direction, relying on external force, gravity, or an integrated internal mechanical spring for the return stroke. Compared to double acting cylinders, they require fewer fluid lines, single-directional valves, and simplified...
Description
Tonghesheng Machinery is one of the competitive manufacturers and suppliers of high-quality custom single acting hydraulic cylinders, and we are also equipped with a professional factory, welcome to buy custom single acting hydraulic cylinders products from our company.
Single acting hydraulic cylinders generate hydraulic force in one direction, relying on external force, gravity, or an integrated internal mechanical spring for the return stroke. Compared to double acting cylinders, they require fewer fluid lines, single-directional valves, and simplified control logic, reducing overall hydraulic system footprint and operating complexity.
Manufactured for heavy-duty industrial machinery, agricultural equipment, dump trailers, and mobile lifting applications, these cylinders accommodate custom stroke lengths, mounting configurations, rod platings, and seal arrangements engineered for target operating pressures and duty cycles.
Key Specifications
|
Parameter |
Standard Range / Technical Options |
|
Bore Size |
20 mm – 300 mm (0.8" – 12") |
|
Piston Rod Diameter |
12 mm – 220 mm (0.5" – 8.6") |
|
Stroke Length |
Up to 6,000 mm (236") |
|
Operating Pressure |
Rated 16 MPa to 35 MPa (160 bar – 350 bar / 2,300 psi – 5,000 psi) |
|
Operating Temperature |
Standard: -20°C to +80°C (-4°F to +176°F) High-Temp Seals: -10°C to +200°C (+14°F to +392°F) Low-Temp Seals: -40°C to +80°C (-40°F to +176°F) |
|
Return Mechanism |
Load/Gravity Return, Plunger Type, or Internal Coil Spring Return |
|
Mounting Types |
Clevis, Flange (Front/Rear), Cross-Tube, Trunnion, Pin-Eye, Spherical Bearing |
|
Fluid Compatibility |
Mineral Oils, Water-Glycol, Synthetic Oils, Biodegradable Hydraulic Fluids |
Key Product Features
Honed Barrel Integrity: Cold-drawn seamless steel tubing honed to an internal surface roughness of Ra <= 0.4 μm minimizes seal wear and friction losses.
Hard Chrome Plated Rods: Precision ground carbon or alloy steel rods plated with 20–50 μm micro-crack hard chrome achieve corrosion resistance up to 96 hours Salt Spray Test (ASTM B117) rating 9/10.
Low-Friction Sealing Package: Polyurethane (PU) or PTFE primary rod seals combined with nitrile (NBR) or fluoroelastomer (FKM) energizers prevent bypass leakage while maintaining low breakaway force.
Integrated Wiper Ring: Polyurethane metal-cased wiper prevents entry of dirt, mud, dust, and moisture into the rod guide bushing.
Durable Spring Modules: High-tensile alloy spring steel return modules withstand over 500,000 continuous extension/retraction cycles without mechanical fatigue failure under standard operating limits.
Custom Design Requirements
Selecting or specifying a single acting hydraulic cylinder requires mechanical calculation of load vectors and fluid power variables:
Push Force Calculation:
F_push = P x A_bore
Where P is system pressure and A_bore is the effective piston cross-sectional area.
Buckling Load Limit (Euler's Column Safety): Long-stroke cylinders operated under compressive load must be evaluated against column buckling. The maximum safe push load (F_cr) depends on rod diameter (d), stroke length (L), and mounting geometry end-fixity factor (K):
F_cr = (pi^2 x E x I) / (K x L)^2
Return Force Allocation: For spring-return cylinders, the compressed spring force must overcome both internal friction (seals, guide bushings) and the dead weight of attached mechanical links during retraction.
Hydraulic Port Sizing & Flow Rate: Port size determines fluid velocity. Excessive velocity creates thermal generation and pressure drops; inadequate sizing causes slow cycle times.
Typical Applications
Agricultural & Harvesting Equipment: Hydraulic lift arms, implement height adjustments, tractor hitches, and hay baler ejectors.
Construction & Earthmoving: Trailer tailgates, stabilizer outriggers, compact excavator attachments, and tilt platforms.
Material Handling & Lifting: Scissor lift tables, forklift mast tilt units, hydraulic dock levelers, and pallet stackers.
Truck Body & Transportation: Single-acting telescopic or rod-style dump truck hoists, car haulers, and tail-lifts.
Industrial Machinery: Hydraulic presses, clamping fixtures, punching dies, and waste compactors.
Customization Options
Raw Materials: St52.3, E355, 20# steel, 45# steel, or 42CrMo seamless honed tubes.
Rod Surface Treatments: Hard Chrome (20–50 μm), Double Chrome, Nickel-Chrome Plating, QPQ / Nitriding, or Stainless Steel Rods (304/316/17-4PH).
Sealing Systems: Standard NBR, High-Temp FKM, Low-Temp PTFE, or premium brand seal packs (Hallite, Parker, SKF).
Ports & Mounting Options: SAE Thread, BSPP, NPT, metric threads, custom Clevis, Flange, Cross-Tube, or Trunnion mountings.
Integrated Valve Options: Counterbalance valves, pilot-operated check valves, orifice restrictors, or velocity fuses integrated into the cylinder end cap.
Manufacturing Process
Material Inspection: Ultrasonic flaw detection and spectral material verification on incoming raw seamless steel tube and solid bar stock.
Deep-Hole Boring & Honing: CNC turning of cylinder heads, pistons, and rod ends; skiving and roller burnishing of tube IDs to achieve Ra <= 0.2-0.4 μm.
Rod Centerless Grinding & Plating: Multi-pass precision grinding followed by electro-plating and automated polishing to ensure dimensional tolerance (ISO f7/h8).
Welding Operations: Automated MIG/MAG and GTAW welding of end caps, ports, cross-tubes, and trunnions adhering to ISO 3834 / AWS D1.1 welding standards.
Skived Seal Assembly & Cleanroom Prep: Cleanroom seal installation to eliminate particulate contamination before final gland torque tightening.
100% Hydraulic Testing: Complete pressure, bypass, and functionality testing.
Shot Blasting & Surface Prep: Mechanical surface preparation prior to painting.
Polyurethane Coating & Delivery: Final protective painting, drying, protective cap fitting, and export packaging.
Inspection and Testing
Every manufactured cylinder undergoes quality verification prior to dispatch:
100% Hydrostatic Pressure Testing: Cylinders are tested at 1.5x rated working pressure (e.g., tested at 31.5 MPa for a 21 MPa working rating) to confirm structural integrity.
Internal Leakage (Bypass) Test: Pressure held at full extension to verify zero fluid bypass across seals over a defined dwell time.
Low-Pressure Breakaway Test: Verifies minimum pressure required to initiate piston movement, ensuring seal concentricity and low sliding friction.
Dimension & Alignment Checks: CMM and laser micrometer inspection of mounting pin centers, stroke length tolerance (+/- 1 mm standard), and rod runout.
Coating Thickness & Adhesion: Magnetic gauge dry film thickness (DFT) measurement (> 80 μm standard paint coat) and cross-hatch adhesion testing.
What Buyers Should Provide for a Quotation
To receive an accurate engineering drawing and commercial proposal within 24–48 hours, provide the following parameters:
Dimensional Specifications:
Bore Diameter (mm or inches)
Piston Rod Diameter (mm or inches)
Required Stroke Length (mm or inches)
Retracted Length (Pin-to-Pin distance / Closed length)
Operating Limits & Conditions:
Maximum Working Pressure (MPa, bar, or PSI)
Working Medium (e.g., ISO VG 46 mineral oil)
Target Cycle Rate / Operating Speed
Environment:
Operating Temperature Range
Outdoor / Corrosive Environment Exposure (e.g., marine corrosion, road salt, dust)
Mounting & Ports:
Mounting Type (e.g., Rear Clevis, Front Flange, Cross Tube, Trunnion)
Port Thread Type & Size (e.g., SAE-8, 3/8" BSPP, M18x1.5)
Pin Diameter and Bushing Requirements
Commercial Details:
Estimated Initial Sample Quantity and Annual Volume (EAU)
Required Surface Finish/Color (e.g., Primer only, Custom RAL Paint, Black Oxide)
FAQ
Q: What is the primary operational difference between a single-acting cylinder and a double-acting cylinder?
A: A single-acting cylinder uses hydraulic power to move the piston in one direction only (push or pull), using gravity, external load, or an internal spring to return it. A double-acting cylinder uses hydraulic power supplied to alternate ports to extend and retract the piston rod in both directions.
Q: How do I select between a Spring-Return and a Load-Return single acting cylinder?
A: Use a spring-return cylinder when the external mechanism or attached load does not exert enough mechanical force to push the fluid back out of the cylinder during retraction (e.g., horizontal clamping fixtures or small tooling). Use a load-return (or weight-return) cylinder when gravity or the external load reliably pushes the rod back (e.g., dump truck hoists, hydraulic jacks, or vertical lift platforms).
Q: Can your custom single acting hydraulic cylinders replace existing OEM cylinders?
A: Yes. By matching pin-to-pin distance, bore diameter, rod diameter, port configuration, and mounting geometry, custom cylinders can be engineered as direct drop-in replacements for original equipment manufacturer (OEM) units on agricultural, mining, or industrial machinery.
Q: What surface treatments are available to prevent rod corrosion in harsh outdoor environments?
A: Standard applications utilize 20–30 μm hard chrome plating. For harsh environments-such as marine, chemical exposure, or road-salt conditions-options include 40–50 μm double chrome plating, Nickel-Chrome plating (30 μm Ni + 20 μm Cr), or stainless steel rods (304/316 or 17-4PH).
Q: What is the typical lead time for custom prototypes versus production batches?
A: Engineering drawings are finalized within 2–4 business days following technical parameter alignment. Prototype manufacturing typically requires 3 to 4 weeks. Standard production batch orders are completed in 4 to 6 weeks depending on volume, raw material availability, and specific testing/certification requirements.
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