Union
Copper Pipe Fittings & Accessories
| Part | Description | Size 1 | Bag | Box |
|---|---|---|---|---|
| RFUN78 | 7/8" UNION | 7/8" | 20 | 200 |
| RFUN1.58 | 1.5/8" UNION | 1.5/8" | 5 | 50 |
- Manufactured to ASME B16.22 Lawton’s ACR fittings are all seamless, one piece fittings, which makes them stronger and easier to use.
- All Lawton’s fittings are available from 1/4” to 4 1/8” for use with our entire range of ACR tubes.
- Regularly needed for large supermarket projects we can supply high pressure fittings for CO2 applications. All fittings from stock for quick delivery.
- Wherever possible all Lawton fittings are engraved for additional traceability.
- We offer a variety of silver solder brazing alloys suitable dependent upon product type and application.
Specific benefits include:
All sealed in protective polythene bags and are product labelled.
Fittings are supplied in reinforced cardboard boxes, labelled with product information and outline drawing of fitting.
Each fitting is engraved with unique branding, space permitting
Fittings for Co2
Degreased copper fittings specifically for ACR and manufactured to ASME B16.22-2001 which can be used in assemblies subject to the Pressure Equipment Directive.
The burst pressure of each fitting size at 55ºc has been determined and a safety factor of at least 3 has been applied to establish a recommended maximum working pressure.
All testing has been conducted in accordance with BS EN 378-2:2008 (+A1:2009).
Maximum Working Pressures
| Size | Burst Pressure | up to 55ºC | up to 100ºC | up to 150ºC |
| 1/4 “ | 500 bar | 150 bar | 150 bar | 131 bar |
| 3/8 ” | 360 bar | 120 bar | 120 bar | 105 bar |
| 1/2 “ | 320 bar | 100 bar | 100 bar | 87 bar |
| 5/8 “ | 300 bar | 100 bar | 100 bar | 87 bar |
| 3/4 “ | 280 bar | 90 bar | 90 bar | 79 bar |
| 7/8 “ | 240 bar | 80 bar | 80 bar | 70 bar |
| 1 1/8 “ | 220 bar | 75 bar | 75 bar | 66 bar |
| 1 3/8 “ | 220 bar | 65 bar | 65 bar | 57 bar |
| 1 5/8 “ | 180 bar | 55 bar | 55 bar | 48 bar |
| 2 1/8” | 100 bar | 33 bar | 33 bar | 29 bar |
| 2 5/8” | 93 bar | 31 bar | 31 bar | 27 bar |
| 3 1/8” | 87 bar | 29 bar | 29 bar | 25 bar |
| 3 5/8” | 84 bar | 28 bar | 28 bar | 24.5 bar |
| 4 1/8” | 81 bar | 27 bar | 27 bar | 23.5 bar |
Technical Data
Product Overview
Lawton Capillary Refrigeration Fittings are designed for use in air conditioning, refrigeration and CO₂ piping systems. Manufactured from high-purity copper and available in sizes from 1/4″ to 4.1/8″ (6.35mm – 104.775mm), the range provides a reliable solution for soldered and brazed refrigeration installations.
Applications
- Air Conditioning Systems
- Refrigeration Piping Systems
- CO₂ Refrigeration Systems
Market Sectors
- Domestic
- Commercial
Product Specifications
| Property | Specification |
| Size Range | 1/4″ – 4.1/8″ (6.35mm – 104.775mm) |
| Material | CW024A Copper |
| Jointing Method | Soldering, Brazing |
| Electrical Continuity | Yes |
| Product Marking | Permanent Marking, Lawton Logo, Size |
| Form of Supply | Bags and Boxes |
| Inner Surface Quality | Clean and Smooth, Carbon Content ≤ 0.38 mg/dm² |
| Thread Specification (Male) | ASME B1.20.1 (NPTE) |
| Thread Specification (Female) | ASME B1.20.1 (NPTI) |
| Standard | ASME B16.22 |
| PED Compliance | Compliant Component in Pressure Equipment Directive Assemblies |
| Warranty | 75 Years* |
*Subject to standard Terms & Conditions. Please refer to our website for full details.
Compatible Refrigerants
Suitable for use with:
- R32
- R134a
- R410A
- R404A
- R407C
- R407F
- R1234yf
- R1234ze
- R744 (CO₂)
- And other common refrigerants
Standards & Compliance
| Category | Standard |
| Fittings Standard | ASME B16.22 |
| Male Thread Specification | ASME B1.20.1 (NPTE) |
| Female Thread Specification | ASME B1.20.1 (NPTI) |
| Pressure Equipment | PED Compliant Component |
Material Composition & Properties
| Property | Value |
| Copper Content Including Silver | 99.90% |
| Phosphorus | 0.015 – 0.040% |
| Total Impurities (Excluding Phosphorus and Silver) | 0.060% |
| Melting Point | 1083°C |
| Density | 8.96 g/cm³ |
Maximum Operating Pressure (BS EN 378-2)
| Size | Burst Pressure | Up to 55°C | Up to 100°C | Up to 150°C |
| 1/4″ | 500 bar | 150 bar | 150 bar | 131 bar |
| 3/8″ | 360 bar | 120 bar | 120 bar | 105 bar |
| 1/2″ | 320 bar | 100 bar | 100 bar | 87 bar |
| 5/8″ | 300 bar | 100 bar | 100 bar | 87 bar |
| 3/4″ | 280 bar | 90 bar | 90 bar | 79 bar |
| 7/8″ | 240 bar | 80 bar | 80 bar | 70 bar |
| 1.1/8″ | 220 bar | 75 bar | 75 bar | 66 bar |
| 1.3/8″ | 220 bar | 65 bar | 65 bar | 57 bar |
| 1.5/8″ | 180 bar | 55 bar | 55 bar | 48 bar |
| 2.1/8″ | 100 bar | 33 bar | 33 bar | 29 bar |
| 2.5/8″ | 93 bar | 31 bar | 31 bar | 27 bar |
| 3.1/8″ | 87 bar | 29 bar | 29 bar | 25 bar |
| 3.5/8″ | 84 bar | 28 bar | 28 bar | 24.5 bar |
| 4.1/8″ | 81 bar | 27 bar | 27 bar | 23.5 bar |
