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Vacuum isolated gate valve of power plant valves

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unit price: negotiable
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period for delivery: Consignment Deadline Days
area: Beijing
Expiry date : Long Effective
last update: 2017-12-13 02:03
view count: 64
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Product details
Product overview
Chief structure features and usages
1. The main body of this series valve uses a casting and forging structure and has a dual-direction seal of parallel secondary semi-forced dual-sealing and the motions of both the sealing face to its due position and the tapered block to wedge-up are separated to have zero lead age come true.
2. The sealing face is of a small frictional force if motion,lightly opened and closed and has a self compensation function for wearing.
3. Simple structure easy to more than 10 years of long duration.
4. A vacuum sealing structure is set in the filling chamber on the valve cover,which has the action of self-expanding and impacting,the joint faces are sealing with the expansive material of high strength to completely isolate the system from air.
5. Two connection ways of b flange and welding,two ways to drive of heand-and eletric-operation. The valve can be used as the open & close device for the pipelines under the working temperature≤425℃ and 550℃ and the working medium of water,steam or air;especially suitable to act as the vacuum isolating sealing for the system of steam turbine's considernation and vacuum negative pressure in steam power plants.
Valve ctrucure type:
Mode1 NKJ61 Vacuum isolating stop valve;Model NKZ44 and NKZ64 Vacuum isolating gate valves.
Manufacture and acceptance standard:
1.Manufacture,acceptance and technical conditions per GB/T12234,GB/T12235.
2. Face-to face dimensions per GB/T12221.
3. Flange sizes per JB/T78-79,GB/T9112-9124.
Material for main parts
Body,Bonnet: 25 or WCB
Valve stem:Cr.stainless steel,25Cr2MoV
Disc:Cr.stainless steel,12Cr1MoVA。
Sealing face:H: alloy steel,Y: carbide alloy
Yoke nut:Al bronze
Packing:Expanding compound graphite
Fastener:High-grade carbon steel,Cr.Mo steel
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