77A Stainless Steel Coupling
Model # SP-77A
The Model SP-77A is designed for high pressure applications including R/O and desalination systems. The SP-77A is available in strong and anti-corrosive alloys of 304, 316, 316L stainless steel, Duplex CD3MN (2205), Super Duplex CE8MN, CE3MN (2507). The 77A features 304 or 316 bolts and silicone bronze heavy nuts to help prevent galling during repetitive use.
Available in sizes ¾” to 8” (DN20 to DN200) rated to a maximum working pressure of 1500 psi (105 bar) and in sizes 10″ to 12″ (DN250 to DN300) rated to a maximum working pressure of 1200 psi (83 bar).
Material Specification
Housings
- Type 304 Stainless steel to ASTM A351 CF8 or A743 Gr. CF8
- Type 316 to ASTM A351 CF8M
- Type 316Lt0 ASTM A351 CF3M
- CE8MN to ASTM A890 Grade 2A
- Austenic 904L (CN2MCuN) to A351
- Duplex (CD3MN) to ASTM A890 Grade 4A
- Super duplex (CE3MN) to ASTM 890 Grade 5A
- Austenic 254SMO (CK3MCuN) to A743
Rubber Gaskets
See page 13 for all available options.
Nuts
- Type 316 stainless steel nuts ASTM A-193 B-8M
- Silicone bronze heavy duty nuts to ASTM B98 C65100
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