Vacuum Flange Globe Valve

NKJ41H Vacuum Flange Globe Valve
Product Name: Vacuum Flange Globe Valve
Product model: NKJ41H
Product caliber: DN10-150
Product pressure: 1.0-10.0 Mpa
Connection form: flange and welding
Material: cast steel (forged steel A105), stainless steel (F304), alloy steel (F11, F22), etc.
Driving mode: manual and electric.
NKJ41H Vacuum Flange Globe Valve Overview:
The main body of vacuum isolation globe valve is cast-forged structure, with parallel double sealing pairs and semi-forced two-way sealing. The seals move in place and wedge-shaped block moves step by step to achieve zero leakage. The friction coefficient between the sealing surfaces is small, and it is convenient to start and close. Moreover, the wear of the sealing surfaces can be compensated automatically. The utility model has the advantages of simple structure, compact structure, convenient maintenance and long service life. The filling chamber of the valve cover has a vacuum sealing mechanism, which has the function of self-expanding deposit compression. Moreover, the connecting surfaces are sealed with high-strength expansion material, which isolates the system from the atmosphere and has good vacuum sealing performance. This series of valves can be divided into flange connection and welding connection. The driving mode is manual and electric. This series of valves are suitable for pipelines with working temperature (< 425 C) and (< 550 C) and working medium (water, air and steam) as starting and closing devices. It is especially suitable for steam turbine condensation and vacuum negative pressure system in thermal power plant, and plays the role of vacuum sealing and isolation.
Technical parameters of NKJ41H vacuum globe valve:
Vacuum isolation globe valve is suitable for cutting off or connecting medium in the condensation system pipeline of return water of thermal power plant with nominal pressure PN4.0-10.0 Mpa and working temperature less than 200 C. Applicable media are: water, steam, etc. The sealing surface has the advantages of small friction force, light opening and closing, and automatic compensation for wear and tear of the sealing surface. The utility model has the advantages of simple structure, compact structure, convenient maintenance and long service life. The filling chamber of the valve cover has a vacuum sealing structure, which has the function of self-expanding and compacting, and the sealing is sealed with high-strength expanding material, so that the system is completely isolated from the atmosphere and has good system air tightness.
Structural characteristics of NKJ41H vacuum globe valve products:
1. The product is designed and manufactured according to JB/T3595 standard, which meets the requirements of matching use of power plant equipment.
2. The packing chamber with vacuum sealing structure is designed to isolate vacuum reliably.
3. The valve stem has good corrosion resistance, abrasion resistance and wear resistance after conditioning and surface nitriding treatment.
4. Flange gaskets are made of composite materials with high expansion coefficient and good air tightness, which ensures reliable isolation of the system from the atmosphere.
5. The inverted seal is made of stainless steel threaded connection seals or austenitic stainless steel surfacing on the body. The inverted seal is reliable. Packing replacement and maintenance can be carried out without shutdown, which is convenient and fast without affecting the operation of the system.
Material description of main parts of NKJ41H vacuum globe valve:Main Dimensions and Weights of NK/J41H-25Main Dimensions and Weights of NK/J41H-40