4 Valve Description
17 of 72
0570.81/22-EN
4.3.2 STAAL 100 AKD/AKDS
Fig. 5:
STAAL 100 AKD/
AKDS
4.3.2.1 General description
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Gate valve with bolted bonnet
Valve for preventing backflow in industrial plants, power stations, process
engineering and shipbuilding.
4.3.2.2 Design details
Design
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Body of forged or welded steel construction
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Bolted cover
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Non-rotating stem with external screw
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Split wedge
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Yoke head suitable for mounting electric and pneumatic actuators (DIN ISO 5210)
Variants
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Stem protecting tube
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Stem protecting tube with position indicator
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Limit switch(es)
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Bypass
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Drain branch
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Hard-faced back seat
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Threaded bush free from non-ferrous metals
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Electric actuators
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Pneumatic actuators
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Spur gear
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Bevel gear
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Actuating bush for remote actuation
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Other flange designs or butt weld end designs
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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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Die-forged model for DN 300/250 on request.
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DN 600 and above on request.
4.3.2.3 Function
Design
The gate valve comprises the pressure-retaining parts, i.e. body 100 and yoke 166, the
functional unit (stem 200, wedge/disc holder 367 and flexibly mounted wedge discs
360), and the actuating element.
Function
The valve is actuated using a handwheel, manual gearbox or electric actuator.
Sealing
Body 100 and yoke 166 are connected by studs 902.1 or grub screws 904 and nuts
920.1, and the joint is sealed to atmosphere by joint ring 411.1.
The seating faces of body 100 and wedge discs 360 are hard-faced. Gland packing
461, which seals off stem 200, is tightened via gland follower 452 by means of studs
902.3 or hinged bolts and nuts 920.2.
Содержание STAAL 100 AKD
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