PVCu Air Release Valve Threaded
Technical Specification
- Valve Type: Vertically Mounted Air Release Valve
- Material:
- Body: Unplasticised Polyvinyl Chloride (PVCu)
- Seals: EPDM
- Sizes: 3/8" to 4"
- Pressure rating:
- 3/8" to 2": 16 bar at 20°C
- 2 1/2" and above: 10 bar 20°C
- Temperature range: 5°C to 60°C
- Connection type: Threaded Union Ends
- Installation Orientation: Vertical Only
- Features:
- No metal parts in contact with fluid
- Marine application approval


Description
This PVCu air release valve is designed to automatically discharge trapped air from pressurised pipelines, helping to maintain efficient flow, reduce pressure losses and prevent air-related system issues such as cavitation and flow restriction. By continuously venting air pockets as they form, the valve supports smoother system operation and improved hydraulic performance.
Manufactured from unplasticised PVC, the valve offers excellent corrosion resistance and long service life in water and chemically compatible fluid systems. The internal non-return mechanism ensures controlled air discharge while preventing fluid escape during normal operation. EPDM seals are supplied as standard, providing reliable sealing performance across the full operating temperature range.
Designed for vertical installation only, the valve features threaded union ends that allow secure integration into PVCu pipework, it should be installed at the highest point in the system. The union design also allows the valve to be easily removed for inspection or maintenance. With no metal parts in contact with the fluid, the valve is suitable for corrosive environments and marine applications where material compatibility is critical.
For more information, please visit our PVCu Pressure Pipe Guide!
Key Features & Benefits
- Automatic air release: Continuously vents trapped air to maintain efficient pipeline flow.
- PVCu construction: Lightweight, corrosion-resistant and suitable for aggressive environments.
- No metal-wetted parts: Ideal for corrosive fluids and marine applications.
- EPDM seals: Provide dependable sealing and long-term reliability.
- Vertical installation: Optimised for upright pipework layouts.
- Wide size range: Available from 1/2" to 4" to suit a variety of systems.
Dimensions


| SKU | Nominal Size (inch) | DN | L Min (mm) | Z Max (mm) | E (mm) | Weight (kg) |
| 359988 | 3/8 | 15 | 13.2 | 53.6 | 49 | 0.103 |
| 356318 | 1/2 | 15 | 13.2 | 53.6 | 49 | 0.103 |
| 356319 | 3/4 | 20 | 14.5 | 63 | 60 | 0.169 |
| 356320 | 1 | 25 | 16.8 | 72.4 | 69 | 0.254 |
| 356321 | 1 1/4 | 32 | 19.1 | 82.8 | 80 | 0.378 |
| 356322 | 1 1/2 | 40 | 19.1 | 91.8 | 96 | 0.595 |
| 356323 | 2 | 50 | 23.4 | 103.2 | 116 | 1.025 |
| 356325 | 3 | 80 | 29.8 | 153.4 | 167 | 3.000 |
| 359989 | 4 | 100 | 61 | 157 | 179 | - |

