4 Valve Description
26 of 72
0570.81/22-EN
4.7 Swing check valves with pressure seal cover
4.7.1 AKR/AKRS
Fig. 13:
AKR/AKRS
4.7.1.1 General description
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Swing check valve with pressure seal cover
Valve for preventing backflow in industrial plants, power stations, process
engineering and shipbuilding.
4.7.1.2 Design details
Design
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Body of forged or welded steel construction
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Pressure seal design
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Internally mounted hinge pin
Variants
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Other flange designs
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Other butt weld end versions
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Inspections to technical codes such as TRD/TRB/AD2000 – German Steam Boiler /
Pressure Vessel Regulations – or to customer specification
4.7.1.3 Function
Design
The swing check valve is equipped with a pressure seal cover. The pressure inside
body 100 presses bonnet 139 against joint ring 411.1; the latter is supported by
segmental ring 501, which rests in a groove inside the body, via compression ring
500. Studs 902.2 and hexagon nuts 920.6, which are supported by cover 161, ensure
that bonnet 139 is held in place against joint ring 411.1, even if there is no pressure
inside body 100.
Sealing
Hinge pin 210 held by bearing bushes 545 acts as a pivotal point for hanger arm 570
with valve disc 746. Together with plate 198, the hanger arm forms a complete
assembly that is inserted into body 100 and clamped and locked in place in a
circumferential groove inside the body by locking plates 196.
4.7.2 ZRS
Fig. 14:
ZRS
4.7.2.1 General description
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Swing check valve with pressure seal cover
Valve for preventing backflow in industrial plants, power stations, process
engineering and shipbuilding.
4.7.2.2 Design details
Design
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Body made of forged steel
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Pressure seal design
▪
Internally mounted hinge pin
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Seat/disc interface made of wear-resistant and corrosion-proof Stellite
