4

Necessity

Principle

reflex ’V in-line vessel’

reflex ’V in-line vessels’ protect the diaphragms of expansion vessels from impermissible temperature loads. According to DIN 4807 Part 3, the continuous temperature on the diaphragm must not exceed 70°C. In cooling systems, tempera-tures of � 0°C should be avoided, so as to eliminate the possibility of the diaphragm freezing to the vessel.

t > 70°C

t � 70°C

Vn

t > 0°Ct � 0°C

Vn

� reflex ’V in-line vessels’ > 5,000 l, > 120°C, and pressures � 10 bar avail-able on request

� reflex ’V in-line vessels’ can also be used as buffer tanks in heating and cool-ing systems

Type Article No. � D H h A Weightmm mm mm mm kg

V 6 7403100 206 245 --- R ¾ 2V 12 7403200 280 285 --- R ¾ 3V 20 7402000 280 360 --- R ¾ 4V 40 7403400 409 562 113 R 1 ?V 60 7402600 409 760 174 R 1 23V 200 7701800 634 900 142 DN 40/PN 16 43V 300 7701900 634 1200 142 DN 40/PN 16 48V 350 7702400 640 1385 210 DN 40/PN 16 51

V 500 7852800 750 1660 210 DN 40/PN 6 79V 750 7851800 750 2310 210 DN 40/PN 6 325V 1000 7851905 1000 2020 305 DN 65/PN 6 560V 1500 7852305 1200 2020 305 DN 65/PN 6 780V 2000 7852405 1200 2480 305 DN 65/PN 6 940V 3000 7852505 1500 2560 340 DN 65/PN 6 1405V 4000 7853405 1500 3130 340 DN 65/PN 6 1930V 5000 7854805 1500 3637 340 DN 65/PN 6 2015

V 1000 7400205 1000 2055 285 DN 65/PN 16 675V 1500 7400305 1200 2055 285 DN 65/PN 16 935V 2000 7400405 1200 2055 285 DN 65/PN 16 960V 3000 7400505 1500 2600 315 DN 65/PN 16 1685V 4000 7400605 1500 3180 315 DN 65/PN 16 2315V 5000 7400705 1500 3720 315 DN 65/PN 16 2420

10 bar / 120°C

6 bar / 120°C

10 bar / 120°C

Vn nominal volume/liters

In heating systems In cooling circuits

If the reflex ’V in-line vessel’ is connected from above, hot expansion water > 70°C displaces cooler water into the diaphragm of the expansion vessel.

If the reflex ’V in-line vessel’ is connected from below, cold expansion water � 0°C displaces warmer water into the diaphragm of the expansion vessel.

Selection

No general formula exists for calculating the nominal volume Vn of ’V in-line vessels’. Local conditions also vary too greatly. We would therefore like to refer you to our calculation program and the brochure for “Pressurization, Degassing, and Make-up Systems – Planning, Calculation, Equipment”.

reflex ’V in-line vessel’

Ø D

H

A

h

Ø D

A

A

500 - 750 liters 1000 - 2000 liters 3000 - 5000 liters60 - 350 liters

Ø D

A

H

H

Ø D

A

6 - 20 liters

Technical data

� Required for systems with return temperatures > 70°C or in cool-ing systems at � 0°C � Approval in accordance with pressure equipment directive 97/23/EC � Application as buffer tank � Red coating

H H

Ah

Ahh

Ø DA

A