NK series vacuum isolation valveDetailed product description：

NK series vacuum isolation valve performance specifications:

Product Type	Shell strength test (MPa)	Upper sealing test (MPa)	Sealing test (MPa)	Applicable media	Applicable temperature (℃)
NKJ61H-40	six	four point four	four point four	Water, steam, air	≤425
NKJ61H-64	nine point six	seven	seven
NKJ61H-100	fifteen	eleven	eleven
NKJ61Y-401	six	4.4.	four point four	Water, steam, air	≤425
NKJ61-601	nine point six	seven	seven
NKJ61Y-1001	fifteen	eleven	eleven

Product Usage:

The NK series vacuum isolation valve is suitable for pipelines with working temperatures ≤ 425 ℃ and ≤ 550 ℃ and working media of water, air, and steam, as a starting and closing device. Especially suitable for steam turbine condensation and vacuum negative pressure systems in thermal power plants, it plays a role in vacuum sealing and isolation.  

Product Structure Features:

The main body of the NK series vacuum isolation valve adopts a cast and forged structure, with parallel double sealing pairs and semi forced bidirectional sealing. The sealing surface moves in place and the wedge-shaped block moves step by step to achieve zero leakage.  
2. The friction coefficient between the sealing surfaces is small, making it easy to open and close, and the wear of the sealing surfaces has an automatic compensation function.  
3. The structure is simple, compact, easy to maintain, and has a long service life.  
4. The valve cover packing chamber is equipped with a vacuum sealing mechanism, which has a self expanding deposit compression effect, and each connecting surface is sealed with high-strength expansion material to ensure the system
Isolated from the atmosphere, it has excellent vacuum sealing performance.
5. The connection forms of this series of valves are divided into flange connection and welding connection, and the driving modes are manual and electric.  

Material Description of NK Series Vacuum Isolation Valve Parts:

Part Name	Valve body and valve cover	valve stem	valve disc	sealing surface	stem nut	filler	fastener
NKJ61H-C type	25 or WCB	Chromium stainless steel	Chromium stainless steel	H: Alloy steel	aluminum bronze	Expanded composite graphite	high-quality carbon steel
NKJ61Y-1 type	chromium-molybdenum steel	20Cr1M01VA or 38CrMoAIA	12Cr1mo1VA	Y: Hard alloy			chromium-molybdenum steel