Goulds Pumps CV 3196 i-FRAME - IOM User Manual

Page 40

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background image

Check

Explanation/comment

Checked

Check that a check valve is installed in

the discharge line, between the

isolation valve and the pump

discharge outlet.

The location between the isolation valve and the

pump allows inspection of the check valve.
The check valve prevents damage to the pump and

seal due to the back flow through the pump, when

the drive unit is shut off. It is also used to restrain

the liquid flow.
See Example: Discharge piping equipment for

illustrations.

If increasers are used, check that they

are installed between the pump and

the check valve.

See Example: Discharge piping equipment for

illustrations.

If quick-closing valves are installed in

the system, check that cushioning

devices are used.

This protects the pump from surges and water

hammer.

Example: Discharge piping equipment

Correct

Incorrect

1

2

3

4

1.

Bypass line

2.

Shut-off valve

3.

Check valve

4.

Discharge isolation valve

2

1

1.

Check valve (incorrect position)

2.

The isolation valve should not be positioned
between the check valve and the pump.

Installation

38

Model CV 3196 i-FRAME Installation, Operation, and Maintenance Manual

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