Viking Pump TSM000: General Information - Manual (Page 3)

SECTION TSM 000 ISSUE I PAGE 3 OF 8
CAuTiON !
internal type relief valves mounted on
viking pumps should always have the
cap or bonnet pointed toward the suction
side of the pump. return-to-tank-type
relief valves should always be mounted
on the discharge side of the pump. if
pump rotation is reversed, change the
relief valve. Turn the internal type end for
end; move the return-to-tank type to the
other port. if, on a particular installation
rotation is reversed, e.g., using one pump
to fill a tank and then by use of a reversing
switch or other means changing the rotation
to permit the same pump to circulate the liquid
through a heater or to load out) then pressure
protection must be provided on both sides
of the pump for both rotations. This may
be a combination of relief valves, torque
limiting devices or rupture disks.
NOTE: on some models the relief valve is mounted on the pump
casing instead of the pump head.
The spring loaded poppet-type valve is strictly a differential valve,
sensing only those pressures on each side of the poppet It should
not be used as a pressure or flow control device it is intended
strictly as a relief valve.
The pressure at which either the return-to-tank or internal relief
valve bypasses can be changed by turning the adjusting screw
Do not back the adjusting screw all the way out Stop when spring
tension is off the screw (the screw starts to turn easily) For details
on maintenance of the relief valve see Technical Service Manual
covering your model series
6. Motor - follow local electrical codes when hooking up motors
figurE 5A
iNTErNAL prESSurE rELiEf vALvE
figurE 5b
rETurN-TO-TANk prESSurE rELiEf vALvE
CAuTiON !
pumps or systems without relief valves
should have some form of pressure
protection, e.g. torque limiting devices or
rupture disks.
Viking pumps can be furnished with either an internal pressure relief
valve - one which directs the flow from the valve back to the suction
side of the pump - or a return-to-tank valve which directs the flow
through piping back to the supply tank See figures 5A and 5b. An
inline relief valve mounted in the discharge piping also directs the
flow back to the supply tank This type of valve should be mounted
close to the pump so that the pressure drop through the piping
between the pump and the valve is at a minimum Be sure there are
no shutoff valves between the pump and relief valve Piping from a
return-to-tank or an in-line valve to the supply tank should also be as
short and large as possible
fOuNdATiON
Every pump should have a solid foundation It may be any structure
sufficiently strong to hold the pump rigid and to absorb any strain or
shock that may be encountered
A certified print of the pumping unit should be used in
preparing the foundation If a separate foundation is provided, make
it at least four inches wider and longer than the base of the unit
When the unit is placed on the foundation it should be leveled and
checked for position against the piping layout and then fastened
down
CHECK ALIGNMENT AFTER MOUNTING
For detailed coupling alignment procedures see Viking service
bulletin ESB-61.
The pump, drive, and motor were properly aligned at the time they
were assembled During shipping and mounting the alignment is
often disturbed bE SurE TO rEChECk ALigNMENT AfTEr
ThE puMp uNiT iS iNSTALLEd!
1. Check pump ports to be sure they are square and in the proper
position; shim or move the pump as required Do not force
piping to line up with the ports
2. If the pump is driven by a flexible coupling(s) either direct
connected to the motor or through a reducer, remove any
coupling guards or covers and check alignment of the coupling
halves A straightedge (a piece of key stock works nicely) across
the coupling must rest evenly on both rims at the top, bottom,
and sides See figure 6, page 4.
ALigNMENT
diSChArgE
SuCTiON
puMp hEAd
diSChArgE
SuCTiON
puMp hEAd
vALvE ALwAyS
MOuNTS ON
diSChArgE
SidE Of puMp
rELiEf vALvE AdjuSTiNg
SCrEw CAp (ShOuLd ALwAyS
pOiNT TOwArd SuCTiON pOrT)