Page 7 - Drilling Rig&Spare Parts
P. 7
PISTON
Roughneck Type
The piston assembly is the main part at fluid end of mud
pump, produces discharge pressure of pump from
reciprocating straight-line motion in
the liner. Small piston produces higher pressure and lower
slow, while large piston produces lower pressure and
higher slow. Pumps in different systems should be
assembled with pistons in according systems, and φ170, φ160, φ150, 6″, 6-1/2″and 7″are often
used. The metric pumps F800, F1000, F1300 and F1600 are equipped with metric pistons of
general use; however the piston bore of F500 is smaller than others. The pumps from F500 to
F1600 are equipped with pistons of general use. Piston bore of F500 is φ25.4, piston bore of F800
—1300 is φ42 and piston bore is φ38.1. Piston core is manufactured in 42CrMo and rubber is
Buna N or polyurethane.
Replaceale Rubber Piston
The piston core is forged from 40Cr, and then heat
treatment. The material of rubber is polyurethane, NBR or
HNBR
Bonded Piston
Piston rubber is bonded on the hub, without snap ring
and platc, suitable for many kinds of drilling condition,
especially for high pressure jetting drilling and ceramic
liners.
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