Corken 91 - Page 33

Appendix B—Specifications for Vertical Single-Acting Models 91–691
Material Specifications
Part Model Standard Material
Head, Cylinder All Ductile iron ASTM A536
Crosshead guide crankcase, flywheel, bearing carrier All Gray iron ASTM A48, Class 30
Flange 691 Ductile iron ASTM A536
Valve seat and bumper
91, 291 17-4 PH stainless steel
491 Ductile iron ASTM A536
691 17-4 PH stainless steel
Valve plate
91, 291 410 stainless steel
491 17-7 PH stainless steel
691 PEEK
Valve spring
91, 291, 691 17-7 PH stainless steel
491 Inconel
Valve gaskets None Soft aluminum
Piston All Gray iron ASTM A48, Class 30
Piston rod None 1045 steel Nitrotec
®1
coated
Crosshead All Gray iron ASTM A48, Class 30
Piston rings
91, 291, 491 PTFE, glass and moly filled
691 Alloy 50
Ring expanders All 302 stainless steel
Packing cartridge, connecting rod All Ductile iron ASTM A536
Packing V-rings
91, 291, 491 PTFE, glass and moly filled
691 Alloy 50
Crankshaft All Ductile iron ASTM A536
Connecting rod bearing All Bimetal D-2 babbit
Wrist pin All C1018 steel
Wrist pin busing All Bronze SAE J461
Main bearing All Tapered roller
Inspection plate All Aluminum
O-rings All Buna-N, Neoprene
®2
(optional)
Retainer rings All Steel
Misc. gaskets All Rubber compositions
1
Registered trademark of TTI Group Ltd.
2
Registered trademark of the DuPont company.
33