Ningguo Kingcool Import and Export Co., Ltd supplies liquid line filter driers and oil separators for refrigeration and air conditioning systems, alongside a one-stop range of HVAC and appliance parts. As a China-based Filter Drier & Oil Separator For Refrigeration System manufacturer, we combine component production experience with an agent-based supply model that covers compressors, controls, copper fittings, refrigerant and installation material for complete refrigeration projects.
What We Supply in This Category
As a Refrigeration Parts-Filter Drier & Oil Separator For Refrigeration System Manufacturers, we match product configuration to the application, operating limits, interfaces and acceptance criteria defined for each project.
Our refrigeration parts range includes two core product families for refrigerant circuit protection and compressor lubrication: liquid line filter driers and SPLY series oil separators. Both are positioned for commercial refrigeration, cold room, condensing unit and air conditioning applications where moisture, acid and oil circulation affect system reliability.
Because we also supply compressors, condensate drain pumps, copper tubes, brass and copper fittings, control valves and manifold gauges, these components can be quoted together with the drier and separator selection. That reduces the number of separate shipments and keeps connection sizes, refrigerant compatibility and installation accessories aligned across one purchase order.
Product Range and Application Fit
Liquid Line Filter Driers
Designed for high moisture dissolution and acid removal, with a 50 micron sieve that retains solid contaminants in the liquid line.
- Liquid line installation ahead of expansion devices
- Moisture and acid control after system assembly or repair
- Protection of compressors, valves and capillary tubes
SPLY Series Oil Separators
Oil separators built to improve compressor efficiency and reduce oil carry-over into the refrigerant circuit.
- Discharge line installation on condensing units
- Support for stable oil return to the compressor
- Useful in larger systems with long pipe runs
Where Each Component Fits in the Circuit
| Component | Circuit Position | Primary Function | Typical Application |
|---|---|---|---|
| Liquid line filter drier | Liquid line, before expansion device | Moisture and acid removal, 50 micron filtration | Cold rooms, display cabinets, split and packaged A/C |
| SPLY series oil separator | Discharge line, after compressor | Oil separation and return, efficiency support | Condensing units, racks, long-line refrigeration |
| Filter drier for refrigerator | Domestic sealed circuit | Moisture control in small refrigerant charges | Refrigerator and freezer service and production |
| Copper tube, brass and copper fittings | Interconnecting pipework | Leak-free joints and matched connection sizes | Installation and field repair kits |
Specification Variables We Confirm
Filter drier and oil separator selection depends on the working point of the system rather than on a single catalogue number. We confirm the following variables before preparing a proposal, so that the delivered component matches the circuit it will serve.
- Refrigerant type – HFC, HCFC and blended refrigerants require compatible desiccant and seal materials.
- Connection size and type – flare, solder or ODF connections matched to the copper tube schedule.
- System capacity – nominal cooling capacity and refrigerant charge determine the required drier and separator volume.
- Operating pressure and temperature – discharge line conditions for oil separators, liquid line conditions for driers.
- Filtration requirement – the 50 micron sieve rating is the reference point for liquid line protection.
- Oil charge and compressor type – mineral or POE oil, reciprocating, scroll or rotary compressor.
- Installation orientation – flow direction and available space in the unit or pipe run.
Materials, Construction and Quality Control
Our manufacturing background is built on metalized polypropylene film capacitor production, supported by high-precision slitting and winding equipment, production lines and testing equipment. That same discipline in dimensional control and incoming material inspection is applied to the refrigeration components we supply, where internal cleanliness and joint integrity directly affect service life.
Quality control covers raw material intake, production monitoring and finished product inspection. For filter driers and oil separators, the practical checks are shell and connection integrity, internal cleanliness, desiccant condition and freedom from contamination before packing. Components are inspected against the confirmed specification before shipment, and inspection records can be referenced in the shipping documentation.
Installation, Commissioning and Maintenance Notes
Correct installation protects both the component and the compressor. Filter driers are installed in the liquid line with flow in the marked direction, and oil separators in the discharge line with the oil return connection routed back to the compressor crankcase through the appropriate return arrangement.
- Keep the circuit sealed until the moment of brazing; moisture ingress shortens desiccant life.
- Use nitrogen purge during brazing to prevent internal oxidation scale.
- Evacuate the system to the required vacuum level before charging.
- Replace the filter drier after any compressor burn-out, major repair or prolonged open-circuit exposure.
- Check oil return and compressor oil level after commissioning an oil separator.
Related Parts for Complete Refrigeration Projects
Filter driers and oil separators are usually ordered together with other circuit components. Our wider refrigeration range covers the parts that sit around them, so a single enquiry can be built into a complete kit for a cold room, condensing unit or service programme.
- Refrigeration Parts – the full category covering valves, fittings, refrigerant, tools and installation material.
- Compressor – rotary and scroll compressors matched to the system capacity and refrigerant.
- Filter Drier For Refrigerator – compact driers for domestic refrigerator and freezer circuits.
- Copper tube, brass and copper fittings – pipework and joints sized to the drier and separator connections.
Information We Use to Configure Your Solution
To prepare a configuration and quotation for filter driers and oil separators, we work from the project data below. The more precisely the working point is described, the closer the first proposal will be to the final requirement.
| Project Input | Why We Need It | Typical Format |
|---|---|---|
| Refrigerant and oil type | Determines desiccant and seal compatibility | R404A, R134a, R410A, POE oil |
| Cooling capacity and charge | Sizes the drier and separator volume | kW or BTU/h, refrigerant charge in kg |
| Connection size and type | Matches existing pipework and fittings | 1/4", 3/8", 1/2" flare or ODF |
| Compressor model | Confirms oil return and discharge conditions | Brand and model reference |
| Quantity and delivery scope | Sets packing and shipment planning | Units per order, destination port |
| Documentation requirement | Aligns inspection records with project acceptance | Inspection list, packing list format |
Packaging, Delivery and Support
Components are packed to protect connections and internal cleanliness during transport, with quantities and labels matched to the confirmed order. Our export experience covers the Middle East, Africa, South America and Southeast Asia, and we handle documentation for consolidated shipments that combine refrigeration parts, air conditioner parts and refrigerator parts in one container.
Each employee works directly with the market, which allows us to respond to fragmented and individual requirements quickly. Technical questions on connection sizing, refrigerant compatibility or replacement intervals are handled by the same contact who prepares the quotation, so the specification and the commercial terms stay consistent from enquiry to delivery.
Frequently Asked Questions
What is the difference between a filter drier and an oil separator?
A filter drier is installed in the liquid line to remove moisture, acid and solid particles before the refrigerant reaches the expansion device. An oil separator is installed in the discharge line to separate compressor oil from the hot gas and return it to the crankcase, which supports compressor efficiency and reduces oil migration through the circuit.
What filtration level do your liquid line filter driers provide?
Our liquid line filter driers are specified with a 50 micron sieve, combined with high moisture dissolution and acid removal capability. This rating retains the solid contaminants typically generated during system assembly, brazing and compressor wear.
Which oil separator series do you supply?
We supply the SPLY series oil separator, designed to enhance the efficiency and energy savings of refrigeration systems. Selection is based on compressor type, discharge line size, refrigerant and oil charge, which we confirm from the project data before quoting.
Can filter driers and oil separators be ordered with other refrigeration parts?
Yes. We operate as a one-stop supplier for air conditioner, refrigerator and refrigeration accessories, so driers and separators can be combined with compressors, copper tubes, brass and copper fittings, control valves, refrigerant and installation material in a single order.
When should a filter drier be replaced?
Replace the filter drier after a compressor burn-out, after any major repair that opens the circuit, or when the system has been exposed to atmosphere for an extended period. Routine replacement during scheduled maintenance also protects the expansion device and compressor from accumulated moisture and acid.
What information do you need to quote a filter drier or oil separator?
Send the refrigerant type, cooling capacity or refrigerant charge, connection size and type, compressor model, required quantity and destination. With those details we can confirm the suitable model, connection configuration and packing scope, and prepare the quotation together with any related refrigeration parts on the same enquiry.
