4 Valve Description
24 of 72
0570.81/22-EN
4.6 Swing check valves with bolted cover
4.6.1 STAAL 40 AKK/AKKS
Fig. 11:
STAAL 40 AKK/AKKS
4.6.1.1 General description
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Swing check valve with bolted cover
Valve for preventing backflow in industrial plants, power stations, process
engineering and shipbuilding.
4.6.1.2 Design details
Design
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Body of forged or welded steel construction
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Bolted cover
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Internally mounted hinge pin
Variants
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Extended hinge pin from DN 300 (for lever and weight)
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Other flange designs
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Other butt weld end versions
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Drain branch
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Seat/disc interface made of wear-resistant and corrosion-proof Stellite
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Inspections to technical codes such as TRD/TRB/AD2000 – German Steam Boiler /
Pressure Vessel Regulations – or to customer specification
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DN 500 and above on request.
4.6.1.3 Function
Design
Swing check valves comprise forged body 100 with hard-faced seating faces. Fluid
flow is shut off by hard-faced valve disc 746, which is flexibly mounted on hanger
arm 570. This connection is secured by means of a nut and a safety pin.
Sealing
Body 100 is bolted to cover 161 using studs 902.1 and sealed to atmosphere by joint
ring 411.1. The disc assembly is pivot-mounted on hinge 230 welded to cover 161 or
on hinge pin 210 mounted in the body.
