Editorial Technical Reference

Hydraulic Reservoir (Tank)

This page explains how Hydraulic Reservoir (Tank) is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A container that stores hydraulic fluid for a hydraulic power unit, providing fluid supply, heat dissipation, and air separation.

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Product Specifications

Technical details and manufacturing context for Hydraulic Reservoir (Tank)

Definition
The hydraulic reservoir (tank) is a critical component of a Hydraulic Power Unit (HPU) that serves as the storage vessel for hydraulic fluid. Its primary functions include: maintaining an adequate supply of fluid to the pump inlet, allowing entrained air to separate from the fluid, dissipating heat generated by the hydraulic system, and providing a space for contaminants to settle. It typically includes features such as a filler/breather cap, fluid level indicator, drain plug, and internal baffles to improve fluid conditioning. The reservoir is available in carbon steel, stainless steel, or aluminum, with a nominal capacity ranging from 10 to 1000 liters (per ISO 1219-1). The maximum operating pressure is typically 1.0 to 1.6 MPa, with reinforced design required above 1.6 MPa. The operating temperature range is -20 to 80°C (per ISO 4413), and the fluid viscosity range is 15 to 100 cSt (per ISO 3448). Filtration rating is 10 to 25 μm (per ISO 16889). Material options include Q235B carbon steel (per GB/T 700), with surface treatment such as phosphating and powder coating (per ISO 12944). Weight ranges from 50 to 500 kg, and dimensions vary from 600×400×500 mm to 2000×1200×1500 mm. Mounting types include horizontal or vertical. Accessories may include level gauge, breather, and drain plug, with optional oil temperature sensor and level switch. Sealing materials are NBR or FKM (per ISO 3601). These specifications are reference ranges; verify model-specific values with the manufacturer.
Working Principle
The reservoir operates on the principle of fluid storage and conditioning. Hydraulic fluid returns from the system to the reservoir, where it cools as it flows over internal surfaces. Baffles slow fluid movement, allowing air bubbles to rise and escape through the breather and solid contaminants to settle. Clean, cooled fluid is then drawn from a separate compartment by the suction line to the pump, completing the fluid circuit. The reservoir also accommodates fluid volume changes due to temperature and cylinder actuation, maintaining a stable supply to the pump inlet.
Common Materials
Carbon Steel, Stainless Steel, Aluminum
Technical Parameters
ParameterTypical rangeNotes & selection driver
Nominal Capacity10–1000 LSelect based on system flow and heat dissipation requirements.ISO 1219-1
Maximum Operating Pressure1.0–1.6 MPaAbove 1.6 MPa requires reinforced design.
Operating Temperature Range-20–80 °COutside this range, fluid viscosity changes affect performance.ISO 4413
Fluid Viscosity Range15–100 cStEnsure pump inlet conditions are met.ISO 3448
Filtration Rating10–25 μmFiner filtration may require higher maintenance.ISO 16889
MaterialQ235BStainless steel available for corrosive environments.GB/T 700
Surface TreatmentPhosphating + Powder CoatingCorrosion protection for outdoor use.ISO 12944
Weight50–500 kgDepends on capacity and material thickness.
Dimensions (L×W×H)600×400×500–2000×1200×1500 mmCustom sizes available upon request.
Mounting TypeHorizontal / VerticalChoose based on space and maintenance access.
AccessoriesLevel gauge, breather, drain plugOptional: oil temperature sensor, level switch.
SealingNBR / FKMFKM for high temperature or aggressive fluids.ISO 3601

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Tank Body/Shell Part
    Main structural container that holds the hydraulic fluid.
    Material: Carbon Steel
  • Baffle Plate Part
    Internal plate that separates return and suction zones, promoting heat dissipation and air separation.
    Material: Steel
  • Filler/Breather Cap Part
    Allows fluid filling and permits air exchange while filtering incoming air.
    Material: Plastic or Metal with filter element
  • Sight Glass/Level Gauge Part
    Visual indicator for monitoring hydraulic fluid level.
    Material: Glass or Polycarbonate
  • Drain Plug Part
    Located at the bottom for complete fluid drainage and sludge removal.
    Material: Steel

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Hydraulic Reservoir (Tank).

Hydraulic Tank Oil Reservoir Fluid Reservoir

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Hydraulic Power Unit (HPU)
View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Atmospheric to 1.5 bar (gauge)
flow rate: Dependent on pump capacity, typically 10-500 L/min
temperature: -20°C to 100°C
slurry concentration: Not applicable - designed for clean hydraulic fluids only
Media Compatibility
✓ Mineral-based hydraulic oils (ISO VG 32-68) ✓ Synthetic ester fluids ✓ Water-glycol fire-resistant fluids
Unsuitable: Highly corrosive chemicals or abrasive slurries
Sizing Data Required
  • Required fluid volume (including system volume + 10-20% reserve)
  • Maximum operating temperature and ambient conditions
  • Pump flow rate and duty cycle for heat dissipation calculation

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Corrosion
Cause: Chemical attack from water contamination, acidic fluid degradation, or exposure to corrosive environments, leading to pitting, thinning, and eventual leaks or structural failure.
Contamination-induced component wear
Cause: Ingress of particulate matter (dust, metal shavings) or water into the hydraulic fluid, causing abrasive damage to pumps, valves, and seals, and promoting sludge formation that clogs filters and passages.
Maintenance Indicators
  • Visible external leaks, especially around welds, fittings, or seals, indicating potential corrosion, fatigue, or seal failure.
  • Audible knocking or gurgling sounds from the tank, suggesting air entrainment or cavitation due to low fluid levels, clogged breathers, or suction line issues.
Engineering Tips
  • Implement routine fluid analysis (e.g., particle counting, water content testing) and strict filtration (using offline or kidney-loop systems) to maintain ISO cleanliness codes and prevent contamination-driven failures.
  • Ensure proper tank design and maintenance: install and regularly inspect desiccant breathers to prevent moisture ingress, maintain correct fluid levels to avoid aeration, and use corrosion-resistant coatings or materials in corrosive environments.

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 4413: Hydraulic fluid power - General rules and safety requirements for systems and their components ANSI/B93.5M: Hydraulic fluid power - Reservoirs

Quoted from the published standard.

Manufacturing Precision
  • Flatness of mounting surfaces: +/-0.1mm
  • Internal cleanliness: ISO 4406 Class 18/16/13 or cleaner
Quality Inspection
  • Pressure test: 1.5x maximum operating pressure for 30 minutes (no leaks)
  • Internal visual inspection: No contamination, burrs, or sharp edges per ISO 4413

Manufacturers of Hydraulic Reservoir (Tank)

2 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Hydrath Power
Zhejiang, CN
Also makes: Directional Control Valve, Pressure Reducing Valve, Hydraulic Power Unit and 9 more
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Hydraulic Tank”
View source page ↗ hydrath.com · checked 2026-08-22
View profile Send enquiry
Target Hydraulics
Shanghai, CN
Also makes: Hydraulic Power Unit, Hydraulic Power Unit (HPU), Hydraulic Manifold and 8 more
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Steel Hydraulic Tank”
View source page ↗ target-hydraulics.com · checked 2026-08-22
View profile Send enquiry

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 16 September 2026

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Frequently Asked Questions

What is the primary function of a hydraulic reservoir?

The primary function is to store hydraulic fluid for the hydraulic power unit, ensuring an adequate supply to the pump inlet. It also allows entrained air to separate, dissipates heat, and provides a space for contaminants to settle.

What materials are available for hydraulic reservoirs?

Common materials include carbon steel (e.g., Q235B), stainless steel, and aluminum. The choice depends on the application, with stainless steel recommended for corrosive environments.

How do I select the correct reservoir capacity?

Capacity selection is based on system flow and heat dissipation requirements. The reference range is 10 to 1000 liters, but the actual size must be confirmed with the manufacturer based on your system's specific needs.

What maintenance signals indicate a problem with the reservoir?

Signs include excessive fluid temperature, visible contamination, air bubbles in the fluid, or low fluid level. Regular checks of the breather, level gauge, and drain plug are recommended. If the fluid appears degraded or the reservoir shows signs of corrosion, service may be required.

Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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