The United States built the world's first experimental nuclear reactor in 1942, and the former Soviet Union built the world's first nuclear power plant in 1954. In the development process of nuclear power technology for more than 60 years, only nuclear power valves have formed a complete design, experiment, manufacturing and testing system, and accumulated a lot of experience, mature products and reliable technology. The following is a brief description of the definition of nuclear and electric valves.
"Power station valve" is also called power station special valve, which is mainly used for the pipeline of various systems of thermal power station, cutting or connecting the pipeline medium. Applicable medium: non-corrosive medium such as water and steam. Compared with other valve products, power station valves are characterized by high temperature and high pressure and unique self-sealing design. The higher the pressure, the more reliable the seal. Due to the special technical characteristics and working conditions, the products also form features that cannot be replaced by other products.
Main design specifications for power station valves
Design and manufacture GB/T12234ASMEB16.34
Structure length JB/T3595
Interface connection size JB/T3595GB/T12224
Inspection and test JB/T3595MSSSP61
Pressure and temperature reference JB/T3595ANSIB16.34
Power station valve main pressure level
Nominal pressure 200, 250, 320
Working pressure P55100V, P55140V, P55170V
Power plant valve structure advantage
1. Pressure self-tightening seal is adopted, and the two ends of the valve body branch are welded.
2. The valve seat and valve sealing surface are made of cobalt-based hard alloy plasma spray welding, which has good wear resistance and scratch resistance.
3. The valve stem is treated by corrosion-resistant nitriding, which has good corrosion resistance and scratch resistance.
Introduction to nuclear power valves
Compared with foreign nuclear power valves, domestic nuclear power valves are relatively complete, with advanced types of nuclear power valves, advanced technology, excellent performance and high reliability. Western nuclear power valve companies such as Westinghouse in the United States, Wilan in Canada, and Famatong in France hold advanced nuclear power technologies. Wilan's nuclear power valves have a good track record of supply in almost 90% of the world's nuclear power plants.
Many nuclear and non-nuclear valves in nuclear islands and conventional islands in nuclear power plants around the world, such as pilot-operated safety valves, main steam isolation valves, regulating valves, and other nuclear power valve technologies and markets are monopolized by the famous nuclear power valve company. And the price is very expensive.
Concerned about surprises
Label: Valve Encyclopedia: Definition and Advantages of Nuclear Valves and Valves
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(1) LDPE Sheet
Low density polyethylene Sheet (also known as high pressure polyethylene Sheet)
(2) LLDPE Sheet
Linear low density polyethylene
(3) MDPE Sheet
Medium density polyethylene
(4) HDPE Sheet
High density polyethylene (also known as low pressure polyethylene)
(5) UHMWPE Sheet
Ultra high molecular weight polyethylene(6)Modified polyethylene sheet
Chlorinated polyethylene (CPE) and crosslinked polyethylene (PEX)
(7)Ethylene - ethylene copolymer
Ethylene/propylene copolymer (plastic), EVA, ethylene, ethylene butene copolymer - other olefins, such as octene POE, cyclic olefin copolymer, ethylene/unsaturated ester copolymer (EAA, EMAA, EEA, EMA, EMMA, EMAH).
Polyethylene, which has a molecular weight of 3 million to 6 million, is known as UHMWPE.
Ultra high molecular weight polyethylene is very strong and can be used for body armor.
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Disadvantages:
PE Plastic sheet have Weak mechanical property, air permeability, easy deformation, easy ageing, brittle, brittle less than PP, easy stress cracking, surface hardness, easy to scratch.
Difficult to print, in printing, surface discharge treatment, cannot electroplating, the surface has no luster.
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The thickness of PE sheet material can be produced from 0.3mm to 1.9mm, the normal width is 600mm, the width cannot exceed 1200mm, the length is not limited.
The thickness of plate can be produced from 2mm to 180mm, the usual specification of 2-10mm is 1000mm* 2000mm, and the commonly used specification of10-180mm is 600*1200mm.PE sheet can also be customized according to requirements, and the width cannot exceed 1200mm, and the length is not limited
Color: natural color is wax white, also can be customized black and color, the order of the color to order is 500KG.
Add antistatic agent to the permanent antistatic electric bar, and the volume resistance value is between 6 to 9 power of 10.Add flame retardant to the flame retardant rod from UL 94V-0 to HB flame retardant grade, and other modification requirements are required to customize various additional properties according to the actual use of the customer.
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Combustion situation: easyCombustion flame status: molten drop, yellow lower blue
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