High Pressure Hydraulic Parts | Engineered for Extreme Conditions
At Shanxi Fuding International Trade Co., Ltd. , we combine over 14 years of precision manufacturing expertise with advanced engineering to deliver high pressure hydraulic parts that perform reliably in the most demanding applications. The term "high pressure" typically refers to systems operating above 450 bar . Whether you need components for 700 bar mobile equipment, 1,000 bar industrial systems, or specialized fittings rated to 4,200 bar, our ISO 9001 certified facility ensures material integrity, micron-level precision, and proven performance under extreme conditions.
What Defines High Pressure Hydraulics?
High pressure hydraulics involves the generation, transmission, and control of fluid power at pressures typically exceeding 450 bar . These systems are essential where heavy loads must be moved precisely in tight spaces, or where maximum power density is required in compact equipment .
Why High Pressure Matters
|
Benefit |
Real-World Impact |
|
Power density |
Smaller components deliver higher forces - critical in space-constrained machinery |
|
Weight reduction |
Higher pressure allows lighter systems without sacrificing performance |
|
Precision control |
Enables smooth, metered movement of heavy loads |
|
Energy efficiency |
Optimized systems reduce energy consumption per unit of work |
Pressure Ranges in High Pressure Hydraulics
|
Range |
Typical Applications |
|
350 – 450 bar |
Standard mobile equipment, industrial machinery |
|
450 – 700 bar |
High-performance mobile, heavy lifting, compact tools |
|
700 – 1,000 bar |
Specialized industrial systems, pressure testing |
|
1,000 – 4,200 bar |
Ultra-high pressure systems, research, specialized oil & gas |
Real-world example: Some systems experience pressure peaks up to 1,000 bar. Components selected for these applications must withstand these conditions without issue .
High Pressure Hydraulic Components We Manufacture
High Pressure Pumps
High pressure pumps are characterized by compact, robust designs suitable for demanding applications . Key types include:
|
Pump Type |
Pressure Range |
Typical Flow |
Applications |
|
Radial piston pumps |
Up to 700 bar |
Up to 91 L/min |
High-pressure systems requiring low pulsation |
|
Air-driven hydraulic pumps |
Up to 1,500 bar |
Up to 12 L/min |
Remote areas, explosive environments |
|
Dual-stage pumps |
Up to 700 bar |
Rapid traverse + high pressure |
Applications combining speed with power |
|
Axial piston pumps |
350-400 bar continuous |
Up to 400 L/min |
Heavy-duty mobile and industrial |
Critical specifications:
Radial piston pump elements: Can be installed separately in extremely tight spaces
Double pump elements: Integrate both low-pressure and high-pressure pistons in one unit
D1P series pumps: Feature angled piston bores and spherical valve plates for high efficiency
High Pressure Valves
Many directional valves for high-pressure applications are designed as seated valves. These provide zero-leakage sealing and are completely resistant to fluid contamination .
|
Valve Type |
Pressure Range |
Flow Range |
Key Features |
|
Directional seated valves |
Up to 700 bar |
Up to 120 L/min |
Zero-leakage ball or cone seat design |
|
Pressure control valves |
Up to 1,000 bar |
Up to 160 L/min |
Reliable system protection |
|
Proportional pressure valves |
350 bar inlet |
Up to 19 L/min |
Precise electronic control |
|
Check valves |
Up to 700 bar |
Up to 200 L/min |
Load-holding capability |
|
Flow control valves |
Up to 700 bar |
Up to 29.5 L/min |
Screw-in design for manifold integration |
|
Proportional directional valves |
350 bar |
Up to 290 L/min |
IP67 rating, CAN communication |
Valve features that matter:
Zero-leakage design: Essential for load-holding applications
Direct-acting vs. pilot-operated: Direct-acting offers faster response
Position monitoring: Available for critical applications
Low internal leakage: Some new valves achieve 40-70% less leakage than previous designs
High Pressure Hydraulic Cylinders
High pressure cylinders are linear actuators designed to generate strong push or pull forces in demanding applications .
|
Specification |
Typical Range |
Notes |
|
Operating pressure |
350 – 700 bar |
Verified with hydrostatic testing |
|
Capacity |
5 – 1,000+ tons |
Force = pressure × piston area |
|
Stroke length |
25 – 2,000+ mm |
Custom lengths available |
|
Types |
Hollow plunger, low height, general purpose |
Construction features :
Tubes with finished interior surfaces
Hard chrome plated piston rods to avoid pitting and scoring
Seals and wipers at end caps to eliminate contaminants and prevent leakage
Single-acting or double-acting configurations
High Pressure Fittings and Connectors
For extreme pressures, standard fittings fail. We manufacture specialized connections rated for high-pressure service.
|
Fitting Type |
Pressure Rating |
Features |
|
NPT high-pressure fittings |
Up to 1,035 bar |
Cold-worked AISI 316L construction |
|
Medium pressure fittings |
Up to 1,400 bar |
For demanding industrial applications |
|
Ultra-high pressure fittings |
Up to 4,200 bar |
Precision cone-and-thread design |
|
Cone and thread fittings |
Up to 4,134 bar |
Metal-to-metal seal, weep hole for leak detection |
Cone and thread fitting design features :
Gland: Secures the threaded connection
Collar: Supports tubing during assembly
Female port: Provides precision mating surface
Weep hole: Allows visual leak detection and verifies proper installation
Custom High Pressure Manifolds
We design and machine manifolds integrating multiple high-pressure functions:
Materials: 4140 steel, 316 stainless steel, custom alloys
Pressure rating: Verified to 700 bar and above
Port options: SAE O-ring boss, cone-and-thread, NPT high-pressure
Cartridge cavities: For screw-in high-pressure valves
Complex circuits: Cross-drilled passages with deburred intersections
Materials for High Pressure Hydraulics
|
Material |
Properties |
Applications |
|
High-strength steel / alloy steel |
High tensile strength, fatigue resistance |
Pump components, valve bodies, cylinders |
|
4140 / 42CrMo steel |
Through-hardening, good toughness |
High-pressure manifolds, fittings |
|
316 stainless steel |
Corrosion resistance, cryogenic capability |
Ultra-high pressure fittings, marine systems |
|
Nickel alloys |
Extreme temperature and corrosion resistance |
Specialized applications |
|
Cold-worked AISI 316L |
Enhanced strength, excellent corrosion resistance |
High-pressure fittings |
Material verification: In-house spectrometer ensures correct alloy composition before machining.
Quality Assurance for High Pressure Components
Testing Capabilities
|
Test |
Purpose |
Standard |
|
Hydrostatic pressure testing |
Verify integrity at 1.5× rated pressure |
Up to 4,200 bar capability |
|
Air leak testing |
Detect microscopic leaks |
Pressure decay method |
|
Functional testing |
Verify valve operation |
Per customer specifications |
|
Cycle testing |
Endurance verification |
Up to 1 million+ cycles |
|
Material verification |
Confirm alloy composition |
Spectrometer analysis |
Inspection Equipment
CMM with scanning capability for complex geometries
Surface roughness testers for sealing surfaces
Hardness testers (Rockwell, Brinell)
Thread gauges for high-pressure connections
Ultrasonic thickness testing
Documentation Provided
First Article Inspection reports with CMM data
Material certifications (Mill Test Reports)
Heat treatment records
Pressure test certificates
Surface finish measurements
Applications - Where High Pressure Hydraulic Parts Are Used
Mobile Equipment
Construction: Excavators, loaders, skid steers requiring 350-400 bar
Agricultural machinery: Tractors, harvesters with high-pressure implements
Forestry equipment: Mulchers, harvesters requiring compact power
Mining machinery: Explosion-proof applications, high-force tools
01
Industrial Applications
Machine tools: Hydraulic clamping, tool changing at 350+ bar
Presses: Metal forming, plastic molding requiring precise pressure control
Material testing: High-pressure test stands
Wind turbines: Pitch control, braking systems
Pulp and paper processing: Heavy-duty hydraulic systems
02
Demolition and Construction Tools
Concrete demolition shears: High-force cutting and crushing
Stone and concrete splitting devices: Wedge systems for controlled splitting
Hydraulic splitters: Rock excavation without explosives
Tank cutters: Cold cutting of vessels
03
Specialized Applications
High-pressure instrumentation circuits: Up to 4,134 bar
Oil and gas testing: High-pressure test loops
Research and development: Custom test rigs
Underwater operations: Adapted high-pressure tools
ATEX zones: Non-sparking hydraulic solutions
04
Heavy Lifting and Tunneling
Hydraulic cylinders: For pushing/pulling in confined spaces
Tunnel construction: Sequential advance systems
Bridge construction: High-force lifting applications
05
Real Customer Examples
Example 1: 700 bar Radial Piston Pump for Demolition Tool
Customer: European demolition equipment manufacturer
Challenge: Compact power source for handheld concrete splitting tool requiring 700 bar operating pressure
Our solution:
Custom radial piston pump element configuration
0.46 cc/rev displacement for high-pressure stage
Integrated low-pressure stage for rapid approach
Compact design fitting within tool handle
Result: Tool achieved 50-ton splitting force in 12 kg package. Zero field failures in first year.
Example 2: High-Pressure Manifold with Zero-Leakage Valves
Customer: Industrial press manufacturer requiring leak-free operation at 500 bar
Challenge: Multiple valve functions in compact envelope with absolute zero external leakage
Our solution:
4140 steel manifold with integral passages
Cartridge cavities for seated directional valves
SAE O-ring boss ports for all connections
100% pressure tested at 750 bar
Result: Zero leaks after 18 months continuous operation. Eliminated fluid loss and environmental concerns.
Example 3: Ultra-High Pressure Fittings for Test Stand
Customer: Research laboratory building 3,500 bar test system
Challenge: Fittings capable of reliable service at extreme pressures with frequent connection/disconnection
Our solution:
Cone-and-thread fittings in 316 stainless steel
4,134 bar pressure rating
Weep hole design for leak detection
Certified installation training provided
Result: System operating safely for 3+ years with zero fitting failures.
Design Considerations for High Pressure Components
General Guidelines
|
Parameter |
Recommendation |
Why |
|
Safety factor |
1.5× minimum at proof pressure |
Accounts for pressure spikes and fatigue |
|
Wall thickness |
Calculate per Lame's formula for pressure vessels |
Prevents burst and excessive stress |
|
Stress concentrations |
Avoid sharp internal corners |
Fatigue failure starts at stress risers |
|
Surface finish |
Ra 0.4μm or better on sealing surfaces |
Ensures reliable sealing at high pressure |
|
Thread selection |
Unified (UN/UNF) or metric with sufficient engagement |
Prevents thread stripping under load |
Material Selection Factors
Yield strength: Must exceed maximum stress at proof pressure
Fatigue strength: Critical for cyclic pressure applications
Toughness: Prevents brittle fracture, especially at low temperatures
Corrosion resistance: Essential for aggressive fluids or environments
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Get a Quote for Your High Pressure Hydraulic Parts
We need:
Component type (pump, valve, cylinder, fitting, manifold)
Operating pressure (maximum and cyclic)
Flow requirements (L/min)
Fluid type and temperature range
Connection types
Quantity and timeline
We provide:
Fixed-price quote
Material recommendations with certifications
Engineering drawings for approval
Lead time commitment
Test documentation
