Pump Solutions Group Neptune Series 600 dia-PUMP MODELS 610 thru 647 - Manual (Page 31)

SECTION VII
SPECIAL INSTRUCTIONS FOR SERIES 600 ‘DIA-PUMPS” WITH PNEUMATIC STROKE CONTROL
Refer to Drawing No. B-001743
11.0 FUNCTION OF THE PNEUMATIC STROKE CONTROL UNIT.
The Neptune pneumatic stroke control unit controls the capacity of the “dia-PUMP’ over the full operating range.
Control is normally effected by an instrument air signal of 3 to 15 psi applied to a Moore Products Model 73N
control valve (Part #100265), (other air signal parameters also available), which is an integral part of Neptune
stroke control unit.
The variation of instrument air signal changes the air pressure on the diaphragm (Part #100287) in the control
unit, which in turn changes the position of the pump capacity control rod (Part #000375, 000385, 000419).
The position change of the control unit can be observed on a capacity percentage scale (Part #100284) seen
through the clear plexi-glass shell of the control unit.
The pneumatic control unit may be attached to any Series 600 “dia-Pump”.
The operating range of supply air may vary between 40 and 80 psi. The Moore control valve is preset at the
factory for a supply air pressure of 60 psi.
The “Pneumatic Stroke Control Unit” is accurately preset and tested at the factory. If the unit does not appear to
perform correctly, please contact your local representative or the factory. Do not attempt to adjust the unit in the
field without factory advice.
11.0.1 The Moore control valve (Part #100265) which is attached to the Neptune actuator supplies a varying
air pressure to the flexible diaphragm (Part #100287) which is, in turn, balanced by operating spring
(Part #100290). The capacity control rod (Part #000375, 000385, 000419) is attached to this system.
With the required air signal, the Moore control valve maintains the correct constant air pressure on the
flexible diaphragm (Part #100287); i.e., constant position of the capacity control rod (Part #000375,
000385, 000419). The springs in the actuator and Moore control valve insure that the controlled
position is maintained without fluctuation. Only changes in the air signal will cause variations in position
of the diaphragm (i.e., capacity control rod). Supply air and instrument input ports are clearly marked
on the Moore Control Valve.
The Moore control valve connections are marked for “Supply Air” and “Instrument Air”. It is important
that clean, dry air be furnished to the “Pneumatic Stroke Control Unit”. Cross sectional drawings of the
complete unit and the Moore control valve are included with the instruction manual.
11.0.2 Maintenance.
The Neptune “Pneumatic Stroke Control Unit” is normally maintenance free. Should, however, any
parts be required, use attached drawing No. B-001743 and the parts list as an assembly guide.
11.0.3 Moore Control Valve
If more complete information is required on the Moore Model 73N control valve, request Moore bulletin
#SD73-5 in writing from Neptune.
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