![Photo of v63 and 66 relief valve](https://www.dklokusa.com/wp-content/themes/dk/library/images/uploads/DKLOK_ProductPhotos_forWeb_1380x720_0013_V63-and-66-Relief-Valve.jpg)
V63 Specs:
- Maximum working pressure: 300 psig @ 68°F (20.6 bar @ 20°C)
- Cracking pressure range: 10 to 225 psig (0.68 to 15.5 bar)
V66 Specs:
- Maximum working pressure: 6,000 psig @ 68°F (413 bar @ 20°C)
- Orifice size: 3.4 mm (0.13 in.)
- Cracking pressure range: 50 to 6,000 psig (15.1 to 413 bar)