Mankenberg M XTRA RP 840 Operating Manual Download Page 8

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• The corrosion protection for the fitting must be adapted to the local conditions.
• A pressure-regulating valve with an exposed spring must be installed in such a way that it presents

no risk of crushing to the operating personnel.

Only valves with open spring:

It is necessary to ensure on site, by an appropriate installation (e.g. not freely accessible)
or providing safety devices and/or positioning a clearly visible warning sign in accordance
with the regulations of EN 292 (formerly accident prevention regulations), that effective pro-
tection is afforded against objects catching on an exposed spring in the pressure-regulating
valve.

If required, MANKENBERG will assist in selecting a suitable type with closed spring cap.

Failure to observe this instruction: danger of crushing for the operating personnel

• Before installing a pressure-regulating valve, it is necessary to make sure that the pipeline section

complies with the recommended installation, as described in the relevant MANKENBERG data
sheet. In particular, a safety valve and a suitable strainer should be installed upstream of the fitting.

In some model series, a control line has to be laid between the pressure-regulating valve
and the pipeline by the customer – this is described in the above-mentioned recommended
installation.

Please note:

- only use control lines made of metal, not of plastic!
- distance of pressure-reducing valve/connection of control line to the pipeline 1 x DN
upstream of the valve and

10x DN downstream of the valve

- distance of backpressure regulator/connection of controllines to the pipeline

5x DN

upstream and downstream of the valve
- distance of vacuum control valve/connection to control line as for a pressure-reducing
valve DM or an backpressure regulator UV, according to design
- when the medium is steam, lay the control line at an angle, with the gradient falling
towards the valve, see (catalogue) section <Know How Pressure-reducing valves>.
- The control line should match the connection on the fitting.
- Adjustable restrictors are integrated in the restrictor assembly to avoid vibrations.

• The pressure-regulating valve should first be adjusted

during the initial start-up

by setting the

adjusting screw on the spring module to the operating conditions – see Section 7 <Initial start-up>.

However, it is necessary to ensure before installation that there is sufficient room for the appropriate
socket or open-jawed spanner above/below the adjusting screw.

As a general rule, pressure-regulating valves should be installed in horizontal lines so that
the pilot valve points upwards.

5.3Installation steps

• Fittings should only be finally unpacked at the installation site and inspected for damage prior to as-

sembly. Damaged fittings must not be installed.

•

It is necessary to ensure that the covers have been removed from all the connection branches befo-
re installation.

The fitting should be inspected to ensure that it is clean. Interior parts must be free of liquid (e.g.
condensate): if necessary, connecting branches should be cleaned before installation with clean
compressed air.

•

The type and dimensions of the line or tank connections must match the fitting to be installed and be
flush with the connecting surfaces of the fitting as well as in a parallel plane to the fitting itself.

If the fitting is marked with an arrow on the housing, the flow in the pipe section must match the mar-
ked direction of flow.

note

important

note

danger

of being
crushed