5 Valve Description
28 of 60
Part No. Description DN Material Material number
543 Spacer bush 15-65 Plastic, glass-fibre reinforced -
549 Collar bush - Stainless steel -
550 Disc - Steel -
580
16)
Cap 15-150 Plastic, glass-fibre reinforced, impact-
resistant
-
200-350 Steel -
901
16)
Hexagon head bolt - 8.8 on EN-GJL-250 variant -
902
16)
Stud - C35E on EN-GJS-400-18-LT variant -
904
16)
Grub screw - Steel -
916
16)
Plug - Plastic -
920
16)
Hexagon nut - C35 on EN-GJS-400-18-LT variant -
925 Stem nut - Coated steel -
961
16)
Handwheel 15-150 Die-cast aluminium on EN-GJL-250
variant
-
200-300 EN-GJL-200 on EN-GJL-250 variant 5.1300
15-350 EN-GJL-200 on EN-GJS-400-18-LT
variant
5.1300
5.4.1.6 Function
The valve consists of the pressure-retaining parts, i.e. body 100 and body bonnet 161.
The functional unit consists of valve disc 350, stem 200, and handwheel 961. Body 100
and body bonnet 161 are joined by means of hexagon head bolts 901 and hexagon
nuts 920 for body material EN-GJL-250. Studs 902 are used for body material EN-
GJS-400-18-LT. The joint is sealed to atmosphere by joint ring 411.
The functional unit basically consists of valve disc 350 and stem 200, bellows 442, and
handwheel 961. Back-up gland packing 461 is tightened by means of two stuffing
box screws 45-6 at stuffing box ring 454.
Fig.4: Sectional drawing of
BOA-H
When delivered, the back-up gland packing is not fully tightened. In the event of a
bellows failure, stuffing box screws 45-6 must be tightened to prevent fluid leakage
(ðSection2.7,Page9) .
The bellows-type stem seal is maintenance-free. As standard, the seat/disc interface
of body 100 and valve disc 350 is made of rust-proof materials or PTFE rings (valve
disc / PTFE variant).
5.5 Lift Check Valves to DIN/EN
5.5.1 BOA-R
5.5.1.1 Operating data
Table20: Operating properties
Characteristic Value
EN-GJL-250 EN-GJS-400-18-LT
Nominal pressure PN 6/16 PN 16
Nominal size DN 15 - 300 DN 15 - 350
Max. permissible pressure [bar] 16 16
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