SPX TG H15-50, Instruction Manual, Page: 37 / 110

37
Fr
1 3 2
suck-back grooves
A.0500.351 – IM-TGH/07.02 EN (10/2015)
3.18.3.2 Radial load on shaft end
The shaft end of the pump shaft may be loaded in radial sense with the maximum radial force (Fr).
See table.
• This force is calculated on the maximum allowable torque and the maximum allowable working
pressure of the pump.
• In case a direct drive with a flexible coupling is used, the indicated force will not be exceeded
when pump and drive are well aligned.
• Starting with the TG H15-50, V-belt drive can be used.
In case of V-belt drive
The maximum allowable radial force Fr as indicated in the table may be chosen higher but
must be calculated case by case in function of pressure, torque and size of the pulley. Consult
your local supplier for advice.
3.18.4 Shaft rotation for pump without safety relief valve
The shaft rotation determines which port of the pump is suction and which is discharge.
The relation between the shaft rotation and the suction/discharge side is indicated by the rotation
arrow plate attached at the top cover of a pump without safety relief valve.
Note! Shaft rotation is always viewed from the shaft end towards the pump.
Unless otherwise specified on the order, TopGear pumps are built at the factory for clockwise
rotation (left figure above), which we define as the standard direction of rotation.
The small arrows 2 and 3 indicate the flow direction of the pumped liquid.
Always make sure that shaft rotation corresponds with the position of the discharge and suction
ports and the direction indicated by the rotation arrow plate.
If the shaft rotation is correct in relation to the port position but different from the direction indicated
by rotation arrow plate, the top cover must be disassembled and turned around by 180°. The two
suck-back grooves will help to evacuate air or gases during start-up or whilst running. As they only
function in one direction of rotation, the
top cover should be positioned in such
a way that the suck-back grooves are
placed towards the suction side.In case
of doubt, contact your local distributor.
If the pump rotates in both directions,
the top cover should be positioned in
such a way that the suck-back grooves
are placed towards the most used
suction side.
TG H pump size Fr (N) - max
2-32/3-32 400
6-40 700
15-50/23-65 1000
58-80/86-100 2000
185-125 3000
360-150 6000
1 Direction of rotation of pump shaft
2 Suction side
3 Discharge side