15.4 - Maintenance of Type BR hydraulic diaphragm pump heads
15.4.1 - Operations to be performed on the Type BR pump head
N.B. The chapters described for the "Pump head Type B" apply to the operation and maintenance
programs
15.4.2 - Recirculation vessel calibration and oil filling
After completing service operations, in order to calibrate recirculation and fill the oil reservoir and the tank
with oil (NUTO H 32 or PHARMA), proceed as follows:
1 Make sure that the drain plug located below is tight.
2 Rotate the adjustment knob clockwise to bring the piston
to 0% of the stroke.
3 Loosen the nut adjusting the recirculation valve spring
(pos 105).
4 Loosen the nut adjusting the reset valve spring (pos 104).
5 Start the pump
6 Pour oil in the tank until it reaches the mark and press the
reset valve; the oil will start flowing into the oil reservoir.
7 Repeat the operation until it is possible to see oil
oscillating inside the tank. At this point, the oil reservoir is
full.
8 Slowly tighten the load nut of the reset spring (pos.104)
until the oil in the tank is still. This operation must be
carried out in the effective system conditions but without
discharge pressure (opening valve "1" – closing valve "2").
9 Pressurise the system by closing valve "1" and opening valve
"2"; the oil in the tank will oscillate.
10 Slowly tighten the load nut of the recirculation spring (pos
105) until oil is still and the pressure gauge "3" indicates the
system’s pressure.
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