Precision Machining of Fluid Control Components

Core strengths

This manufacturing process offers the following unique advantages:

- Absence of Casting Defects: Completely eliminates casting flaws such as porosity, shrinkage cavities, and sand inclusions, thereby ensuring the reliability of pressure-bearing components.
- High Material Density: The material itself features continuous metal grain flow lines, resulting in mechanical properties superior to those of cast parts.
- High Dimensional Accuracy: CNC machining ensures that critical mating surfaces achieve micron-level precision.
- Superior Surface Finish: Machined surface roughness can reach Ra 0.8–1.6 μm, leading to enhanced sealing performance.
- Economical for Small Batches: Requires no expensive casting molds, making it ideal for small-to-medium batch customized orders.

Equipment Capabilities

- Machining Centers: 30 units (including 4-axis simultaneous machining equipment)
- CNC Lathes: 32 units
- Drilling & Tapping Centers: Dedicated equipment for drilling and thread tapping
- Inspection Equipment: Coordinate Measuring Machines (CMM), Air Leak Testers, Hardness Testers, Surface Roughness Testers

Core Product Introduction

1. Precision Pump Body Machining

Product Function
The pump body serves as the core housing for pumping equipment; it encloses the impeller or rotor, forms the sealed fluid chamber, connects the inlet and outlet piping, withstands system operating pressures, and provides a mounting datum.

Machining Types
- Centrifugal Pump Bodies: Volute channel machining, inlet/outlet flanges, bearing bores
- Gear Pump Bodies: Precision chamber machining, gear cavities, side plate mounting surfaces
- Plunger Pump Bodies: Plunger bore machining, valve plate mounting surfaces, high-pressure fluid channels
- Vacuum Pump Bodies: Sealed chambers, intake/exhaust ports, cooling water channels

Technical Specifications
- Material Selection: 6061-T6 Aluminum Alloy, 304/316 Stainless Steel, 45Carbon Steel
- Dimensional Range: Maximum machining dimensions: 800 × 600 × 400 mm
- Precision Class:
- Bearing Bore Tolerance: H7 Class (e.g., φ50H7: +0.025 / 0 mm)
- Mounting Surface Flatness: ≤ 0.02 mm / 100 mm
- Coaxiality: ≤ 0.02 mm
- Surface Roughness: Ra 0.8 – 1.6 μm

Machining Features
- Fluid Channel Machining: Utilizes 4-axis simultaneous machining for complex fluid channels
- Seal Groove Machining: Precision machining of O-ring grooves and gasket grooves
- Thread Machining: Various standard pipe threads (NPT, BSP, Metric)
- Leak Testing: 100% airtightness inspection

2. Precision Valve Body Machining

Product Function
The valve body is the core component responsible for controlling fluid direction, pressure, and flow rate; it houses the valve spool, valve seat, and actuator, thereby ensuring precise system control.

Machining Types

Technical Specifications
- Pressure Rating: PN16–PN420 (Max. 42 MPa)
- Temperature Range: -196°C to +450°C (depending on material)
- Sealing Performance: Zero leakage (API 598 Standard)
- Internal Bore Precision: IT6–IT7 Grade (Tolerance: 0.01–0.02 mm)

Machining Features
- Deep Hole Machining: Maximum depth-to-diameter ratio of 20:1
- Cross-Hole Deburring: Specialized processes to ensure internal cleanliness
- Thread Machining: Various standard threads with 6H/6g precision
- Valve Seat Machining: Conical sealing surfaces with a surface roughness of Ra 0.4 μm

3. Precision Tube Fittings & Components

Product Function
Tube fittings are critical components for establishing pipeline connections, directional changes, and branching points, ensuring both the leak-tightness and maintainability of the piping system.

Product Series
- Ferrule Fittings: Precision-machined conical sealing surfaces; suitable for high-pressure pipelines.
- Flared Fittings: Flared conical sealing surfaces; suitable for medium-to-low pressure systems.
- Weld Fittings: Machined weld bevels; suitable for permanent connections.
- Quick-Connect Couplings: Precision-mated sealing surfaces; enable rapid connection and disconnection.
- Tees / Crosses / Elbows: Facilitate multi-directional fluid routing.

Technical Specifications
- Size Range: 1/8" to 4" (DN6 – DN100)
- Thread Types: NPT, BSPP, BSPT, Metric Threads
- Sealing Methods: Conical Seal, Face Seal, O-Ring Seal
- Pressure Rating: Up to 70 MPa (depending on specific size/configuration)

Manufacturing Features
- Thread Processing: Rolled or cut threads; precision tolerance of 6g/6H.
- Conical Surface Machining: Sealing cone surface roughness Ra ≤ 0.4 μm.
- Drilling & Tapping: Side ports and mounting holes completed in a single fixturing setup.
- Polishing Treatment: Polished internal surfaces to minimize fluid flow resistance.

4. Precision Flanges

Product Function
Flanges are critical components for establishing pipeline connections and equipment interfaces; they provide bolted connection surfaces and sealing faces, facilitating easy assembly, disassembly, and maintenance.

Product Types
- Slip-On Flanges: Feature a machined welding neck; suitable for medium-to-low pressure applications.
- Weld Neck Flanges: Feature a tapered neck transition; suitable for high-pressure applications.
- Socket Weld Flanges: Feature a machined socket bore; suitable for small-bore piping.
- Blind Flanges: Feature a machined sealing face; used for capping pipelines.
- Specialty Flanges: Non-standard shapes designed to meet specific installation requirements.

Technical Specifications
- Standard Series: ANSI B16.5, DIN EN 1092, JIS, GB
- Pressure Ratings: 150lb to 2500lb (PN16–PN420)
- Sealing Face Types: RF, RTJ, FF, MFM
- Size Range: DN15–DN600

Machining Features
- Sealing Face Machining: Flatness ≤ 0.05mm; Surface Roughness Ra 1.6–3.2μm.
- Bolt Hole Machining: Positional Tolerance ± 0.1mm; circumferentially equidistant spacing.
- Spigot/Recess Machining: Precision-fit spigot/recess profiles to facilitate alignment.
- Neck Bevel Machining: Precision forming of the tapered neck profile for Weld Neck Flanges.

5. Hydraulic Valve Blocks

Product Function
The hydraulic valve block serves as the core component of an integrated hydraulic system. It integrates multiple hydraulic valves onto a single metal block, featuring complex internal oil passages that enable the hydraulic system to be compact and highly integrated.

Technical Features
- Integrated Design: Replaces traditional piping connections, thereby reducing potential leak points.
- Compact Structure: Offers high space utilization efficiency, making it ideal for complex hydraulic systems.
- Stable Performance: Features short internal oil passages, resulting in minimal pressure loss.
- Convenient Maintenance: Valves are externally mounted, facilitating easy inspection, repair, and replacement.

Processing Capabilities
- Maximum Dimensions: 800 × 600 × 400 mm
- Drilling Capabilities:
- Minimum Hole Diameter: φ3 mm
- Maximum Depth: 500 mm
- Depth-to-Diameter Ratio: Max. 20:1
- Intersecting Holes: Up to 100+ oil passages

Precision Requirements
- Hole Diameter Tolerance: H8–H9 Grade
- Hole Position Tolerance: ±0.05 mm
- Surface Roughness: Ra 0.8–1.6 μm
- Perpendicularity/Parallelism: ≤0.02 mm / 100 mm

Machining Challenges and Solutions

Performance Comparison: Extrusion + CNC vs. Traditional Casting

Material Selection Guide

Quality Control System

Inspection Equipment
- Coordinate Measuring Machines (CMM): 3 units (Zeiss, Hexagon); Accuracy: ±0.002 mm
- Leak Testers: Testing pressure up to 70 MPa
- Roughness & Profile Testers: Inspection of sealing surface quality
- Hardness Testers: Verification of material properties
- Spectrometers: Confirmation of material composition

Inspection Items
- Dimensional Inspection: 100% measurement of critical dimensions
- Geometric Tolerances: Coaxiality, Perpendicularity, Flatness
- Thread Inspection: Go/No-Go gauges, Thread micrometers
- Sealing Tests: Leak testing, Hydrostatic testing
- Cleanliness Inspection: Inspection for internal residues and burrs

Application Scenarios

Construction Machinery
- Excavator Hydraulic Valve Blocks
- Loader Control Valve Bodies
- Crane Rotary Joints
- Concrete Pump Truck Fittings

Oil & Petrochemical
- Christmas Tree Valve Bodies
- Oil Pipeline Flanges
- Refinery Equipment Pump Bodies
- High-Pressure Pipe Fittings

Industrial Automation
- Pneumatic Solenoid Valve Bodies
- Hydraulic System Valve Blocks
- Lubrication System Distributors
- Cooling System Fittings

Marine & Offshore
- Seawater Desalination Pump Bodies
- Ballast System Valves
- Bilge Water Piping
- Offshore Platform Flanges

Metallurgy & Power
- Hydraulic Servo Valve Bodies
- Lubrication System Distributors
- Cooling Water System Flanges
- Steam Turbine Lubrication Oil Piping

Technical Support and Services

Phase 1: Requirements Consultation (1–2 Days)
- Drawing Analysis
- Material Selection Recommendations
- Process Feasibility Assessment

Phase 2: Technical Solution (2–3 Days)
- Process Route Design
- Quotation & Lead Time
- DFM Feedback

Phase 3: Sample Production (7–10 Days)
- CNC Programming
- Sample Machining
- Full-Dimensional Inspection
- Sample Approval

Phase 4: Mass Production
- Raw Material Procurement
- Automated Production
- Process Control
- Full Inspection & Packaging

Phase 5: After-Sales Service
- Quality Tracking
- Technical Support
- Continuous Improvement

Frequently Asked Questions

Q: What is the Minimum Order Quantity (MOQ)?
A: The MOQ starts at 1 piece for samples; for batch production, the MOQ generally ranges from 10 to 50 pieces, depending on the complexity of the part.

Q: What is the maximum weight of a valve block you can machine?
A: The maximum weight for a machinable workpiece is 500 kg, with dimensions up to 800 × 600 × 400 mm.

Q: Can you machine deep holes? What is the maximum depth?
A: Yes, we can. We utilize gun drilling technology to achieve a maximum depth of 500 mm, with a depth-to-diameter ratio of 20:1.

Q: How do you ensure the cleanliness of intersecting holes?
A: We employ a process involving high-pressure flushing, ultrasonic cleaning, and endoscopic inspection.

Q: What surface treatments do you offer?
A: We offer polishing, anodizing, electroless nickel plating, Dacromet coating, Teflon coating, passivation, and other treatments.

Q: Do you provide design optimization services?
A: Yes, we offer free DFM (Design for Manufacturability) analysis to optimize port layouts and reduce manufacturing complexity.

Get a Quote & Samples

We offer complimentary technical consultation and sample services:

For a Quote, Please Provide:
1. 2D/3D Drawings (in STEP, IGS, or DWG format)
2. Material Specifications
3. Surface Finish Requirements
4. Quantity and Delivery Requirements

Sample Requests:
- Samples are available for verification purposes for new orders
- Sample costs may be refunded upon placement of the bulk order
- Comprehensive inspection reports are provided

Why choose us

Professional Manufacturing Capabilities
- Cluster of 30+ Machining Centers
- Dedicated Deep-Hole Machining Equipment (Gun Drilling)
- Automated Drilling and Tapping Units
- Annual Production Capacity: 500,000 Fluid Components

Technical Team Expertise
- 15+ Years of Experience in Fluid Component Machining
- Proficient in Various Sealing Structures and Standards
- Capable of Designing Integrated Hydraulic Solutions
- Rapid Technical Problem Resolution

Rapid Response Capabilities
- Sample Lead Time: 7–10 Business Days
- Batch Orders: 15–25 Days
- Urgent Orders: 72-Hour Expedited Service

Quality Assurance
- ISO 9001:2015 Quality Management System
- Key Dimensions: CPK ≥ 1.33
- 100% Outgoing Inspection
- Material Certificates and Inspection Reports Provided