29
2
1
3
suck-back grooves
A
B
C
C
B
A
A.0500.751 – IM-TGBLOC/01.00 EN (10/2020)
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 safety relief valve must be disassembled and turned around by 180°.
If the pump rotates in both directions, a double safety relief valve is required.
When a double safety relief valve is installed three arrow plates are attached – one on each valve
(A and B) indicating the liquid flow direction of each valve (small arrows 2 and 3) and one on the
Y-casing (C) indicating the most favourable direction of rotation of the pump (arrow 1).
Be sure that the safety relief valves are mounted opposite each other so that the arrow plates on the
safety relief valves (A and B) are indicating opposite liquid flow directions.
