Watson-Marlow 620RA - Manual (Page 9)

ATEX: Watson-Marlow 620RA, 620REA and 620RE4A pumpheads User Manual 9
10 Materials of construction:
620RA pumpheads
Description Part No. Material Finish
Rotor body MR2269M PPS Fortron/10% Celstran
SF50
Rotor arm MR2270M PPS Fortron/10% Celstran
SF50
Link bar MR2263M PPS Fortron
Rotor cover MR2055M Hytrel G5544
Guard MR3134T Aluminium alloy LM24 Powder coated
Track MR2267T Aluminium alloy LM24M Powder coated
Seal MR3133B Closed cell Neoprene
Spindle roller MR2014T Stainless steel 303S31
Pin pivot MR2265T Stainless steel 303S31
Pin reset MR2017T Stainless steel 303S31
Spindle roller
support MR2015T Stainless steel 303S31
Thrust washer MR2010T Stainless steel 303S31
Leaf spring MR2266S Stainless steel 303S31
Lever adjuster MR2264M Stainless steel 316
Roller assembly
(620RA) MRA0250A Stainless steel 303S31
Roller assembly
(620REA, 620RE4A) MRA0249A AlSl440C
Bearing roller BB0059 MOS2 filled Nylon
Roller support MR2012T Zinc alloy
Circlip CX0179 Carbon spring steel to
BS1449, CS80
Earth lead MRA0330A Copper Tin coating
The above materials have been carefully selected and have a well proven track
record. However, if there are any aggressive chemicals present then it is imperative
that a risk assessment is conducted. This must not be limited to just the pumped
fluid but should also include any other aggressive fluids in the intended operating
environment.