Product Catalog

Vacuum Isolation Gate Valve (NKZ41H)

Industrial valves and fittings dispatch fast — wear parts and complete machines quoted on request.

Power Plant High-Pressure Valves

High-pressure valves for power plants, desalination and boiler systems: gate, globe and check, PN100 to PN320 and Class 600 to Class 2500, chrome-moly bodies for steam up to 540 °C. Images are representative renderings of each series; finish, accessories and nameplate follow the confirmed drawing.

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A condenser runs below atmospheric pressure, so a normal gate gland leaks air inwards instead of water outwards, and air in a condenser destroys the vacuum and the heat transfer with it. This valve carries two packing rings with a sealing-water nipple between them: the water layer seals against inward air. Cast steel body, flanged, rising stem, DN50 to DN600.

General Specifications

Size RangeDN50 – DN600
Pressure RatingPN10 / PN16
Design StandardGB/T 12234 / ASME B16.34
End ConnectionDouble flanged (ASME B16.5 / EN 1092-1)
PackingDouble packing with sealing-water injection nipple
StemRising stem, OS&Y
MediaSteam, condensate, vacuum — condenser and evaporator duty
Max. Working Temperature200 °C

Materials & Coating

Body / BonnetWCB cast steel
WedgeFlexible wedge, 13Cr faced
Seat13Cr overlay
GasketSpiral wound, graphite filled
PackingGraphite, two rings with water seal between

Applications

Condenser isolation Vacuum systems Turbine exhaust Evaporators

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