Kerr Pump Corporation KT-3350XP Parts And Service Manual page 9

the valve a couple of good blows utilizing a brass bar and hammer to seat the valve seat in the fluid end valve bore. Replace the valve
spring and cover cap after inspecting the spring and the seal of the cover cap.
ii. SUCTION VALVES: The suction valves are located in the chamber directly below the suction or end valve cover caps. The suction
valves are serviced in the identical manner as the discharge valves. Note: Discharge valves must be removed prior to any removal of
the suction valves.
Service Procedure for KZ‐3150 Valves
iii. DISCHARGE VALVES: The discharge valve and seat can be exposed by first removing the discharge valve cover plate. Once the
discharge cover cap has been removed you may lift out the discharge valve spring, discharge valve and valve seat. Once the valve and
seat have been removed they should be replaced if badly worn. To replace discharge valve, first clean and inspect the seat bore for
wash out defects and then drop the seat into the bore. Replace valve in seat then valve spring and cover cap, always‐inspecting o'ring
seals between seats and cover caps.
iv. SUCTION VALVES: The suction valves are located in the chamber directly below the discharge valve seat. The suction valves are
serviced in the identical manner as the discharge valves.
B. DISC TYPE VALVES: All disc‐type valves are exposed for removal in a similar manner as the wing‐guided valves. Instead of removing the valve
body; the upper portion of the valve is removed by removal of the valve capscrew, spring retainer, valve spring, and valve spacer sleeve. The
valve seat is then "pulled" from the fluid‐end utilizing an authorized Kerr Valve Puller. Note: In all Kerr Pumps with disc‐type valves the
discharge and suction valves are identical.
C. BALL AND SEAT VALVES: In pumps with block/billet type fluid‐ends the valves are ball and seat design. These are exposed for
removal/inspection by removal of the appropriate valve cover. The flat seats are kept in place by a screw‐in valve retainer that can be best
removed with a Kerr Valve Wrench made for the appropriate pump. Springs are normally incorporated with the discharge valves while the
suction valves operate with a "free ball". A copper washer/gasket is used under all valve seats for a seal. When installing or removing a flat
type valve seat a good "rap" on top of the valve wrench will "seat/unseat" the seat and copper gasket prior final tightening or removal.
Failure to "seat" the valve seat in this manner can result in the "washing out" of the fluid‐end. For pressurized suction, valves will need to be
spring loaded. Call Kerr Pumps for this change.
D. PLUNGERS: Following the removal of the suction valve, the plunger may be removed by breaking the union between the plunger and pony
rod and forcing the plunger out the back of the fluid‐end. Loosening the packing nut/gland will facilitate the removal of the plunger. The
reverse of this procedure is used to install a plunger. Lubrication and some slight force may be used to pass plunger through the packing.