Valmet Flowrox Expulse Series, Installation, Operation And Maintenance Instructions

11

4EXP70EN - 9/2023

The maximum filling air pressure for the dampener 

is 6 bar (0,6 MPa).

In case the process pipeline pressure is changed readjust 

the dampener pressure.

When a dampener is decommissioned, dispose the parts 

according to the local regulations and the instructions given 

by the part or device manufacturer.

Collect and dispose dangerous process media, so that people 

and environment are not endangered. Follow the local 

regulations.

Servicing and Maintenance

6.2  General maintenance and checks

 WARNING!

High pressure injection hazard.

Isolate the dampener completely from the process, 

depressurise and drain it before changing the hoses. 

Follow the factory safety regulations.

Do not step on the dampener installed in horizontal or 

angled position.

Only personnel with appropriate training are allowed to 

service the dampeners.

Check the condition of the dampener regularly. When the 

dampener actuates flawlessly, periodic inspection is the only 

mandatory maintenance task. Do not neglect it as hoses wear 

over time depending on conditions and process. 

Scheduled maintenance

Include the dampeners in your factory maintenance program. 

Maintenance tasks and service intervals are offered as a 

guideline in Table 4. Schedules will vary with applications.

Table 4. 

Maintenance schedule.

Maintenance task

Frequency & advice

Check the dampener pressure.

Every month.

Check the dampener doesn’t hit 

anything and there’s no leakage.

Every month.

Spare parts

To ensure correct and quick delivery of spare parts, the order 

must contain the following information:
•  Dampener type number as in type plate (example: 

FPD65-10-0-2-NR)

•  Spare part name and quantity (example: Damping Hose, 

1 piece)

You can order the spare parts from Valmet's Flow Control 

offices, distributors or agents. Contact information is available 

at https://contact.neles.com/
It is recommended to keep 1 set of hoses and clamps as spare 

parts at your factory warehouse. For part numbers refer to 

figures 1 and 2.

6.3  Changing the hoses

To change the hoses, the dampener needs to be removed 

from the pipeline. Part numbers refer to 

Figures 1 and 2.

 WARNING!

High pressure injection hazard.

Do not disconnect a pressurized dampener from the 

pipeline for any reason.

Removing the hoses

1.  Shut down the pump and lock it to OFF position.
2.  Depressurise and drain the pipeline according to factory 

specific orders.

3.  Depressurise the dampener with the valve (part 7) on the 

hose flange.

4.  Loosen the flange connections and lift the dampener 

to a suitable working surface. Use lifting equipment on 

dampeners weighing over 25kg.