MultiStar Parts – Your Source for Bus Air Conditioner Parts
Multistar Parts Co., Ltd. offers high-quality hydraulic fittings manufactured in China, designed as direct replacements for internationally recognized brands including Manuli and Goodyear.
Our fittings deliver exceptional value for both aftermarket and OEM applications, combining competitive pricing with reliable performance.
Key Selection Parameters for Bus AC Fittings
When selecting the correct fitting for your bus air conditioning system, the following parameters are essential for accurate identification:
1. High/Low Pressure
Bus AC fittings are categorized based on internal diameter (ID) to distinguish between high-pressure and low-pressure lines:
| Pressure Type | Internal Diameter (ID) | Application |
|---|---|---|
| High Pressure | 22mm | Discharge line from compressor to condenser |
| Low Pressure | 28mm | Suction line from evaporator to compressor |
Important: These internal diameter measurements are the primary method for identifying the correct fitting. Incorrect sizing can lead to system leaks, pressure loss, and compressor failure.
2. Crimping Type
Our fittings support two primary connection methods:
| Crimping Type | Description | Best For |
|---|---|---|
| Self-Locking | Push-to-connect design with internal locking mechanism | Quick installation, emergency repairs, frequent maintenance |
| Crimped | Permanent connection using hydraulic crimping machine | OEM production, high-vibration applications, maximum reliability |
Application Guidance:
- Self-locking fittings are ideal for workshop repairs and fleet maintenance
- Crimped fittings are recommended for original equipment and heavy-duty installations
3. Connection Port Types
We offer multiple port configurations for system compatibility:
| Port Type | Description | Common Applications |
|---|---|---|
| Flat Port | Seals via O-ring on flat face | Standard bus AC connections |
| OR Port | O-ring boss seal | Common in European and Asian bus systems |
| Flare Port | 45° or 37° conical seal | Older systems and specific OEM designs |
| Cone Port | Tapered metal-to-metal seal | Not recommended; limited use |
Note: Flat ports and OR ports are the most common configurations we supply. Flare and cone ports are available upon request.
4. Bend Angles
Fittings are available in various angles to accommodate routing constraints:
| Angle | Application |
|---|---|
| 45° | Gentle bends, space-limited installations |
| 90° | Most common, right-angle routing |
| 135° | Reverse routing and specific OEM designs |
| 180° | Straight-through connections |
Multistar Parts Co., Ltd. – Your trusted partner for bus air condidtioner parts and complete thermo king parts and carrier transicold parts . OEM-grade quality, competitive pricing, global shipping from China.
Application Guide
| System | Recommended Fitting Type | Port Type | Pressure Rating |
|---|---|---|---|
| Compressor Discharge | Crimped, 90° elbow | Flat or OR port | 22mm ID |
| Condenser Connections | Self-locking, 45°-90° | Flat or OR port | 22mm ID |
| Evaporator Suction | Crimped, 90°-180° | Flat or OR port | 28mm ID |
| Expansion Valve Lines | Self-locking, 45°-90° | OR port | 28mm ID |
Aftermarket (Repair & Maintenance)
- Bus & Coach HVAC Systems – Refrigerant and coolant line connections
- Heavy Equipment – Construction, mining, and agricultural machinery
- Industrial Hydraulics – Factory automation and material handling
OEM (Original Equipment Manufacturing)
- Commercial Vehicle Manufacturers – Factory-installed hydraulic systems
- Equipment Builders – Integrated hydraulic solutions
- System Integrators – Custom fitting configurations
OEM & Customization Services
We support OEM/ODM services based on customer drawings or samples, with capabilities including:
- Branding: Logo imprinting and custom packaging
- Material Options: Carbon steel, stainless steel (304/316), brass
- Surface Treatment: Zinc plating (yellow, white, trivalent chrome), phosphate coating
- Custom Sizes: From 1/4″ to 2″ (DN06 to DN50)
- Special Threads: Custom metric and inch standards
Why Multistar Parts?
| Advantage | Benefit |
|---|---|
| Factory Direct Pricing | No middlemen – lower costs for customers |
| OEM-Grade Quality | Fittings designed to meet international standards |
| Flexible MOQ | Small orders accepted for trial |
| Fast Turnaround | 25-30 days standard production |
| Global Shipping | Worldwide delivery via sea or air freight |
| Technical Support | Expert assistance for cross-referencing |
Quick Selection Checklist
Before ordering, confirm the following parameters:
| Parameter | Your Specification |
| High / Low Pressure | ☐ High (22mm ID) ☐ Low (28mm ID) |
| Port Type | ☐ Flat ☐ OR ☐ Flare (please confirm if required) |
| Crimping Type | ☐ Self-locking ☐ Crimped |
| Bend Angle | ☐ 45° ☐ 90° ☐ 135° ☐ 180° |
| Thread Standard | ☐ DIN ☐ BSP ☐ SAE ☐ NPT ☐ ORFS |
| Hose Size | #___ (e.g., #6, #8, #10, #12, #16) |
Multistar Parts Co., Ltd. – Your trusted partner for bus air conditioning compressors and complete HVAC spare parts. OEM-grade quality, competitive pricing, global shipping from China.