| Model | AL-4 Standard | AL-4 Mid. Pressure | AL-4T Standard | AL-4T Mid. Pressure | AL-4S | AL-4ST |
| Size | 2-1/2″ (65 mm) 3″ (80 mm) 4″ (100 mm) 5″ (125 mm) 6″ (150 mm) |
2-1/2″ (65 mm) 3″ (80 mm) 4″ (100 mm) 5″ (125 mm) 6″ (150 mm) |
2-1/2″ (65 mm) 3″ (80 mm) 4″ (100 mm) 5″ (125 mm) 6″ (150 mm) |
2-1/2″ (65 mm) 3″ (80 mm) 4″ (100 mm) 5″ (125 mm) 6″ (150 mm) |
2-1/2″ (65 mm) 3″ (80 mm) 4″ (100 mm) |
2-1/2″ (65 mm) 3″ (80 mm) 4″ (100 mm) |
| Connection Type | JIS 10K FF Flanged | JIS 16K FF Flanged | JIS 10K FF Flanged | JIS 16K FF Flanged | JIS 10K FF Flanged JIS 16K FF Flanged JIS 20K FF Flanged |
JIS 10K FF Flanged JIS 16K FF Flanged JIS 20K FF Flanged |
| Body Material | Grey Cast Iron | Grey Cast Iron | Grey Cast Iron | Grey Cast Iron | Grey Cast Iron Carbon Steel Stainless Steel |
Grey Cast Iron Carbon Steel Stainless Steel |
| Maximum Operating Pressure | 0.05-1.0MPa @ 220℃ | 0.05-1.5MPa @ 220℃ | 0.05-1.0MPa @ 120℃ | 0.05-1.5MPa @ 120℃ | 0.05-2.0MPa @ 220℃ | 0.05-2.0MPa @ 120℃ |
The AL-4 Series can be used as a safety valve after a pressure reducing valve, and can be used in small boilers and various pressure vessels. The recommended application is steam. Metal-to-metal seals provide excellent corrosion resistance.