A ProVia Relay Emergency Valve (REV) controls a two-line trailer brake system actuated by the braking system of the tractor. The product controls the emergency brake function, triggering automatic trailer braking when a partial or total pressure drop is detected in the supply line.
Valves comply to ECE R13 brake system regulations. They come with 3 unified delivery ports 16 x 1.5 for all variants and configuration of add on valves (Trailer Release Valve) meeting majority of market application of trailer builders and agriculture market. A new default silencer decreases noise level of all valves advancing market regulation meeting ECE R51 norm.
From now, all our Relay Emergency Valves are delivered to you in a new design. Discover all the rebuilt variants with full product functionality.
| ProVia part number | Predominance | Ports |
| PRO 648 001 0 | Yes (0 up to 0.7 bar) | 1, 1 – 2: M22×1.5; 2: 3xM16×1.5; 4: M16x1,5 |
| PRO 648 002 0 | No | |
| PRO 648 003 0 | Yes (0 up to 0.7 bar) | |
| PRO 648 004 0 | Yes (0 up to 0.7 bar) |
* With Trailer Release Valve.