Marking Of The Fitting - Mankenberg M Xtra Rp 840 Betriebsanleitung

These valves are no shut-off elements ensuring a tight closing of the valve. In accordance
with DIN EN 60534-4 and/or ANSI FCI 70-2 they may feature a leakage rate in closed positi-
on in compliance with the leakage classes II – V:
Leakage class II (metal sealing double seat cone) = 0.5% K
Leakage class III (metal sealing cone) = 0.1 % K
Leakage class IV (PTFE seal cone) = 0.01 % K
Leakage class V (soft seal cone) = 1.8 x 10
*D=seat diameter
Consequently, according to DIN EN ISO 2503 and DIN EN ISO 7291, a safety valve has to
be installed on the control side, which is dimensioned and adjusted in such a way that the lo-
wer one of both pressure indications as mentioned below is relevant as response pressure:
danger of
- 1.5 times the maximum set pressure and/or (P out) of the valve (see nameplate),
fatalities
whichever is the lowest
- PS out (see nameplate)
The response pressure of the safety valve should be abt. 40 % above the max. set pressure
of the pressure control valve.
Contrarily to the Pressure Equipment Directive, Annex 1, Paragraph 7.3, the short-term ma-
ximum excess pressure is limited to 5 % of the max. allowable pressure (see above).
Failure to observe this regulation means danger to life and limb and may cause da-
mage to the pressure-regulating valve.
Pressure-regulating valves are generally supplied with an open spring cap to facilitate main-
tenance.
Valves with a sealed spring cap and leakage line connection can be supplied for toxic or
caution
hazardous media. In this case the user must make sure that a suitable leakage line is installed.
Service life
The valve is designed for quasi-static operation. 1000 full load variations between 0 bar and
PS max (PN or MAWP) are permitted, based on the entire service life of the pressure vessel;
see No. 1.4 AD 2000 sheet S 1.
caution
Relevant pressure surges or dynamic loads are not permissible. The estimated service life is
approx. 5 years.
MANKENBERG valves are supplied as standard for screw-mounted or flange-mounted pipeline/tank
connections – also for special connections if required.
The upper limit of the permitted operating data is permanently marked on each fitting supplied.
In the following sections the two valve types DM and UV are combined under the heading of "Fitting" or
"Pressure-regulating valves" apart from a few sections that only apply to the valve types mentioned.

2 Marking of the fitting

Each fitting bears the following markings as a minimum:
For Marking
Manufacturer MANKENBERG
Pressure-reducing + type or
Fitting design
backpressure regulator + type
e.g. DN or G and numerical
Nominal diameter
value
PN or Class and numerical va-
Nominal pressure
lue
Druckbereich Druckbereich und Zahlenwerte
Max. permitted Temperature and numerical va-
temp. lue
Body material e.g. CrNiMo
Flow direction Indicated by an arrow
value
vs
value
vs
value
vs
-5
x Δp x D* [l/h]
Remark
See Section 11 <Further information> for the address
Design name as per accompanying MANKENBERG
data sheet
Numerical value for DN in [mm], for G in [inches]
Numerical value for PN in [bar], for Class in [lbs/square
inch]. Unless otherwise indicated, all data give the
overpressure above atmospheric.
If 2 numerical values are given, these apply to the inlet
and outlet pressure.
Temperatures above 50 °C entail a reduced pressure
resistance. This must be considered for the correspon-
ding material in accordance with the DIN EN 1092
standard
CrNiMo = high-alloy austenitic steel
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