Pump-solutions-group Neptune Series 560 dia-PUMP Manuel d'utilisateur télécharger pdf (Page 25)

APPENDIX

ADDENDUM: Special instructions for Series 500, 500-A & 560 “dia-Pumps” with Double Diaphragm

THEORY OF OPERATION

VACUUM AIR FROM INTERMEDIATE SPACE

1.0.6 Open valve Item No. 5 (Figure 2).

1.0.7 To remove air, attach the vacuum pump with a

hose connection Item No. 6 to the valve Item

No. 5 (Figure 5). The intermediate space is

evacuated to 3 psig for normal operating

conditions.

The instructions below are for Neptune’s optional Double

Diaphragm Kit which is available for the Neptune Series

500, 500-A, and 560 “dia-Pumps”.

Use of a double diaphragm allows diaphragm to be

monitored and provides an early warning upon failure of

either diaphragm allowing repairs to be made before

process fluid mix with the pump hydraulic fluid.

Neptune’s double diaphragm is a kit which may be

retrofitted to any pump currently in service or may be

installed on a new pump at the factory.

Figure 1 illustrates a Double Diaphragm Assembly. An

intermediate plate is located between the oil and liquid

heads with one diaphragm on each side of the

intermediate plate. The Intermediate Plate is connected

to a rupture alarm or pressure switch via a capillary

system. The area between the diaphragms is

evacuated. Rupture in either diaphragm produces an

increase in volume and, therefore, a pressure increase,

which can be sensed by a pressure switch for alarm

purposes.

DISASSEMBLY OF INTERMEDIATE PLATE

1.0.0 Shut pump off and disconnect suction and dis-

charge piping. Remove drain plug and drain

hydraulic fluid from the gearbox.

1.0.1 Remove 8 Screws and remove the liquid head

assembly. Some hydraulic oil and process fluid

will spill out when the head is removed.

1.0.2 The intermediate plate, which is between the

pump heads can be removed easily.

1.0.3 Remove the rupture alarm (pressure switch) and

clean the capillary system.

1.0.4 Replace one or both diaphragms if needed.

1.0.5 To reassemble reverse above procedure. Be

certain that parts align properly.

DOUBLE DIAPHRAGM OPTION

560 PUMP

FIGURE 1

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 35 36

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