Mankenberg DM 555 ATEX H2 Originalbetriebsanleitung Seite 7

Original operating manual
Pressure reducing valve DM 555 ATEX H2
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 position in
compliance with the leakage classes II – V:
danger of
Leakage class II (metal sealing double seat cone) = 0.5% K
fatalities
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 lower
one of both pressure indications as mentioned below is relevant as response pressure:
- 1.5 times the maximum set pressure and/or (P out) of the valve (see nameplate), 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
maximum 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 damage
to the pressure-regulating valve.
Pressure-regulating valves are generally supplied with an open bonnet to facilitate
maintenance.
Valves with a sealed bonnet and leakage line connectionv can be supplied for toxic or
caution
hazardous media. In this case the user must make sure that a suitable leakage line is installed.
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 for pressure and temperature is permanently marked on each
fitting supplied.
Pressure gauge option - The technical data of the pressure gauge (connection size and temperature) must
match those of the valve and the plant.
The valve is not ready for use in the delivered condition because the pressure gauge connection is open and no
pressure gauge is supplied. The technical tightness between pressure gauge connection and pressure gauge is
established by the operator.
Option vakuum proof designThe valve is vacuum-proof and thus can be exposed to external overpressure to
a limited extent.
DM 555 ATEX H2-4.X.22.4 Issue 21.12.2022
value
vs
value
vs
value
vs
-5
x Δp x D* [l/h]
7
Made in Germany