Pump-solutions-group Neptune Series 560 dia-PUMP Manuel d'utilisateur télécharger pdf (Page 10)

2.0

SUCTION PIPING

2.0.1 The suction piping to the pump must be absolutely air tight. It is suggested that the suction piping be tested with

low air pressure and a soap solution to assure that no leaks exist.

2.0.2

Neptune recommends that the "dia-Pump" be operated with a flooded suction, as this will facilitate start up and

increase the service life of the pump. It is, however, possible to operate the ‘‘dia-Pump’’ with a suction lift of up to 5

feet, if absolutely necessary. A foot valve strainer must be used on this type of application.

2.0.3 It is highly recommended that all solution tanks be purchased with a low level cut off switch or low level alarm and

cut off switch to prevent the pump from running dry. OPERATION AGAINST A DRY SYSTEM WILL CAUSE

DAMAGE TO THE PUMP DIAPHRAGM AND REDUCE THE OPERATING LIFE OF THE PUMP.

3.0 DISCHARGE PIPING

3.0.1 It is recommended that the ‘‘dia-Pump’’ operate against a minimum discharge pressure of 50 psig. An

anti-siphon spring is supplied loose with the pump. If 50 psig back pressure is not provided by the

application, the anti-siphon spring (FIG. #5666*) should be installed on the pin under the vent plug (FIG.

#5604*). Installation of the anti-siphon spring artificially creates a discharge head.

An external Back Pressure valve should be used with PVC or KYNAR head pumps.

*Refer to part list on page #14

4.0 ADJUSTMENT OF INTERNAL RELIEF VALVE

4.0.1 All Neptune Series 560 dia-Pumps are supplied with an internally pre-set relief valve. THIS

RELIEF VALVE IS SET AT 175 PSI AND IS DESIGNED TO PROTECT THE PUMP SHOULD

A DISCHARGE PRESSURE BEYOND THE RATED LIMIT OF THE PUMP OCCUR. If a customer

order specifies a relief valve setting above those indicated above, the specified setting will be set at the

factory. All pumps are tagged with the relief valve setting used by the factory.

To protect the external piping system, it is recommended that a relief valve as manufactured by

Neptune Chemical Pump Company, or equal, be placed in the discharge line of the pump. It is further

recommended that this relief valve be piped into return of the tank with clear PVC tubing so that it can

be determined if the solution is by-passing through the valve and returning to the tank, indicating a line

blockage.

Drawing 5670 on page#18, illustrates the location of the Internal Relief Valve (FIG. #5648 through

#5652).

The drawing shows a passage connecting the hydraulic fluid reservoir with the hydraulic fluid side of the

diaphragm.

The passage is interrupted by the Relief Valve Ball (FIG. #5648) which is backed up by a Relief Valve

Spring (FIG. #5650).

If, during the pump operation, the pressure on the hydraulic fluid side of the pump exceeds the set

pressure of the internal relief valve, the ball is forced from its seat allowing the hydraulic fluid to flow

back to the reservoir.

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Pump-solutions-group Neptune Series 560 dia-PUMP Manuel d'utilisateur Page 10