Coupling (DN20.DN25.DN40)
The stainless steel high pressure coupling is designed for high pressure applications, such as RO and desalination systems. The 77A series is available with strong and anti-corrosive alloys of CF8 (ss304), CF8M (316), CF3M (316L), Duplex CD3MN (2205), super duplex CE8MN, CE3MN (2507). The 77C features 304 / 316 botls and silicone bronze heavy nuts to prevent galling during repetitive use.
Sizes - inches / DN & Operation pressure rating
3/4" to 8" (DN20 to DN200) 1500 psi (105 bar)
10" to 12" (DN250 to DN300) 1200 psi (83 bar) (cut groove only)
Material specification:
Super duplex 2507 (CE3MN) to ASTM A890 Grade 5A
-CE8MN TO ASTM A 890 GRADE 2A
-Duplex 2205 (CD3MN) to ASTM A 890 Grade 4A
-Austenic 254SMO (CK3MCuN) TO A743
-Austenic 904L (CN2MCuN) TO A351
-316 to ASTM A743 CF8M
-316L to ASTM A743 CF3M
Rubber gaskets:
The gasket seal is C-shaped, made of EPDM for cold water, hot water, acid, oil-free air and multiple chemical solution (-50C to 150C).
Bolts: Type SS304 or 316 stainless steel track bolts ASTM A193- B8M
Nuts: Type SS304 or 316 stainless steel nuts ASTM A-193 B-8M
Optional silicone bronze heavy duty nuts to ASTM B98 C65 100.
Model |
Material options |
Seal |
Size |
Pressure
rating |
Work
Temperature |
| Inch |
DN |
| 75L |
CF8: ss304
CF8M: 316
CF3M: 316L
Duplex CD3MN: 2205
Super Duplex CED8MN,
CE3MN: 2507 |
EPDM |
3/4"-8" |
DN20-DN300 |
300psi |
-50~150 ºC |
| 76M |
600psi |
| 77H |
1200psi |
| 77AH |
1200psi |
| 77AH-E |
10"-12" |
DN250-DN300 |
1500psi |
Audited Supplier 
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