Pulsafeeder Pulsa Series 680 EN User Manual download pdf (Page 7)

1.5 Hydraulic Bypass Valve

Any excess hydraulic pressure buildup within the pump compression chamber or chemical end due to

accidental valve closure or line stoppage is relieved through the hydraulic bypass valve. It blows off oil

under excess pressure ahead of the plunger back into the oil reservoir thus terminating the pumping action

and protecting the pump mechanism. Hydraulic bypass valves are factory set at full design pressure unless

specified differently by purchaser.

1.6 Pressure Relief Valve

A separate process relief valve should be installed in the process piping to protect piping and sensitive

process equipment.

1.7 Bleeder Valve

The function of this valve is to release any air or oil vapors from ahead of the piston and maintain a solid

hydraulic medium to transmit infinite movements of the piston to the diaphragm. In large piston models

where adequate oil movement exists, the bleed valve functions automatically weeping a minute quantity of

oil plus any air or vapor out of the hydraulic system. In small piston models where oil movement and

hydraulic instabilities are minimal a manual bleed valve is used.

Additional detail on the function of these valves will be given as applicable in the Operation, Maintenance

and Trouble Shooting Sections.

1.8 Reagent Head Assemblies

Flat diaphragm reagent head assemblies are available in several basic configurations. They are:

Figure No. 5 ¼” through 1 ½” piston metal reagent head and plastic diaphragm

Figure No. 6 ¼” through

5/8” metal reagent head and metal diaphragm

Figure No. 7 ½” through 1 ½”, plastic reagent head and plastic diaphragm

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Pulsafeeder Pulsa Series 680 EN User Manual Page 7