With the continuous development of science and technology, China's regulating valve product market is also developing towards high-tech content, strong corrosion resistance, high parameters, strong corrosion resistance and high life. According to the analysis of domestic and foreign regulating valve technology and the analysis of domestic and international valve market demand, the high-tech development trend and investment direction of industrial valve and valve industry in various industries in recent years are studied, as follows:
Nuclear power valve
Nuclear power valves have higher technical characteristics and requirements than conventional large-scale thermal power station valves. Valves generally have gate valves, check valves, check valves, butterfly valves, safety valves, main steam isolation valves, ball valves, pneumatic regulating valve diaphragm regulating valves, pressure reducing valves and control valves; the highest technical parameters of representative valves are : Maximum diameter DN1200mm (core 3 butterfly valve), DN800mm (core 2 main steam isolation valve), DN350mm (core 1 primary circuit gate valve); maximum pressure: about 1500 pounds; maximum temperature: about 350 ° C; Medium: coolant (borated water), etc. Requirements for the production of nuclear grade valve products: generally according to the nuclear industry standard EJ, the United States ASME, IEEE standards and French pressurized water reactor nuclear island machinery and equipment design and construction rules RCC-M.
The specific types and parameters of nuclear power valve development are as follows:
(1) Nuclear power shut-off valve:
Used for the shut-off valve on the auxiliary line. The valve is usually constructed in three configurations, namely a packing type shut-off valve, an electric regulating valve bellows type shut-off valve, and a metal diaphragm type globe valve. The valve medium is water and steam with medium parameters (medium temperature, medium pressure); nominal diameter: DN10~150mm.
(2) Gate valve without stuffing box:
a hydraulically actuated gate valve. The valve pushes the piston to open or close by means of its own pressure water. The nominal diameter of the valve: DN350, 400mm; working pressure: PN17.5MPa; working temperature: 315 °C.
b fully enclosed electric gate valve. The valve should be equipped with a special screen-closed motor to open and close the shutter through an inner planetary reduction mechanism that is immersed in water. The valve has a nominal diameter: DN100~800mm; working pressure: PN2.5~45.0MPa; working temperature: 200~500°C.
Note: The advantages of the above two non-filled gate valves: no packing seal, avoiding external leaks and reducing energy consumption. Disadvantages: complex structure and high cost.
(3) Butterfly valve for nuclear power:
A butterfly valve used in systems for cooling systems and conveying air media within containment. The valve is usually of three types, namely a coaxial direct-connected rubber butterfly valve, an eccentric metal-sealed butterfly valve, and a double-acting type (the butterfly plate is separated from the sealing surface before turning, and the metal sealing butterfly valve is rotated). The valve nominal diameter: DN ≤ 2500mm; working pressure: PN <4.0MPa; working temperature: 100 ~ 150 ° C. In addition, for the quick closing butterfly valve in the air duct system, its nominal diameter: DN400~1200mm is also listed as the development direction.
(4) Pilot-operated safety valves with detectors for nuclear power:
Pilot-operated safety valve with detector for use in nuclear island systems. The Shanghai regulating valve adopts a pilot-operated safety valve with a detector, which can change the principle of the position control release and the two contacts of the charging medium according to the sensitive relationship between the pressure and the spring force balance, and avoid the jamming problem from the structure. The valve uses a positive-acting valve flap with spring preload and bellows seal to ensure a reliable seal. The valve nominal diameter: DN600mm; working pressure: PN1.265MPa.
(5) Check valve type isolation valve for nuclear power:
2. Valves for oil and gas wellhead devices
The valves for oil and gas wellheads are mainly single or double gates complying with American API6A standards, forged steel parallel gate valves with or without diversion holes, mud valves, self-regulating valve angle throttle valves Oilfield-specific parallel regulating valve, oilfield-specific straight-through check valve, water injection, polymer-specific parallel gate valve, clamp-type parallel gate valve, pilot-operated safety valve and check valve.
The nominal pressure levels of valves for oil and gas wellheads are API2000psi, 3000psi, 5000psi, 10000psi, 15000psi, 20,000psi; nominal diameters are DN46~228mm (113/16in~9in); temperature grade is K(-60~182°C) , L (-42 ~ 182 ° C), P (-29 ~ 182 ° C), R (room temperature), S (-18 ~ 166 ° C), T (-18 ~ 182 ° C), U (-18 ~ 121 ° C) , V (2 ~ 121 ° C); material requirements are AA, BB, CC, DD, EE, FF, HH; material performance requirements are 36K, 45K, 60K, 75K; product technical requirements according to PSL1 (product specification level 1), PSL2 (Product Specification Level 2), PSL3 (Product Specification Level 3), PSL4 (Product Specification Level 4).
3. Valves for oil and gas long-distance pipelines
The valves for oil and natural gas long-distance pipelines are mainly single or double gates complying with the US API6D standard, slab gate valves with diversion holes or non-drainage holes; forged steel or cast steel three-body, top-mounted or all-welded Fixed ball valve; oil seal or pressure balanced plug valve; swing or butterfly check valve, ball check valve; pig valve.
The nominal pressure levels of these valves are CL150 (PN2.0MPa), CL300 (PN5.0MPa), CL400 (PN6.4MPa), CL600 (PN10.0MPa), CL900 (PN15.0MPa), CL1500 (PN25.0MPa), CL2500. (PN42.0MPa); nominal diameter is DN50~1500mm (2in~60in); fire test technical requirements are according to ISO10497; pressure test of valve is ISO5208.
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