As the scale of the power grid continues to expand, the degree of interconnection of the power grid is getting higher and higher. However, when a momentary strong fault current occurs due to an accidental short circuit or grounding at a certain point in the transmission network, it often causes equipment burnout, personal injury and death and large-scale blackout.
The saturated iron core type superconducting current limiter is excited by a superconducting coil, and its superconducting characteristic is used to transform the traditional magnetron reactor to make it operate with low impedance and fault current limiting high impedance, which becomes a new short-circuit current solution, especially in It has an irreplaceable advantage in high-voltage and ultra-high voltage power grids and is a safe and stable current limiting device. The electromechanical group fully utilized the advantages of the industrial technology platform, and cooperated with Beijing Yundian Yingna Superconducting Cable Co., Ltd. to select the saturated iron core type superconducting current limiter as the breakthrough of superconducting force application, and fully developed and developed the 35kV and 220kV prototypes. In particular, it has achieved a major breakthrough in key technologies such as quick-break DC, core cross-section and voltage clamping, and mastered the key technology of superconducting current limiter with world leading level and independent intellectual property rights, greatly reducing the volume of the restrictor. , weight and cost, running loss is only one-tenth of the traditional equipment. Currently, the device has applied for 8 patents.
The successful development of the 35kV superconducting current limiter has established the city's leading position in this field, marking the level of China's superconducting power application technology to a new level. At present, "research and development of 220kV high temperature superconducting current limiter" It has been included in the national “Eleventh Five-Year Plan†863 Program Support Project and is expected to be connected to the grid in 2009.
API 602: Steel wedge Gate Valve for Sizes 4" and Smaller for the Petroleum and Natural Gas Industries.
BS 5352: Specification for Steel Wedge Gate Valves 50 mm and Smaller for the Petroleum, Petrochemical and Allied Industries.
Connection: ASME B16.34 Valves Flanged, Threaded and Welding Ends
Flange: ASME B16.5 Pipe Flanges and Flanged Fittings: NPS 1/2 through 24
ASME B16.47 Series A Large Diameter Steel Flanges: NPS 26 Through NPS 60 Metric/Inch Standard
Butt Weld:ASME B16.25 Buttwelding Ends
Face to face:ASME B16.10 Face to Face and End to End Dimensions of Valves
MSS SP-25 Standard Marking System for Valves, Fittings, Flanges and Union
BB, OS&Y: Bolt Bonnet, Outside screw and Yoke
Materials
Size Range: 1/2" - 2" / DN15-DN200
Pressure rating: ANSI Class150LB- 2500LB / PN16- PN100
Forged Steel: ASTM A105, ASTM A350 LF1, ASTM A350 LF2, etc.
Stainless Steel: ASTM A182 304 , ASTM A182 304L, ASTM A182 316, ASTM A182 316L, ASTM A350 F11, ASTM A350 F22, ASTM A350 F51, ASTM F347, etc.
Operation: Handwheel, Gearbox
Test : API598
Report: CHEMICAL ANALYSIS OF MATERIAL CERTIFAICATE EN 10204 3.1B
Gate Valve and Globe Valve, Sliding Stem Valve, Velan Globe Valves, Globe Gate Valve
Zhejiang Zhongcheng Valve Co.,Ltd. , http://www.apivalvestar.com