Gate Valve that opens by lifting a round or rectangular gate/wedge out of the path of the fluid. The distinct feature of a gate valve is the sealing surfaces between the gate and seats are planar. The gate faces can form a wedge shape or they can be parallel. Typical gate valves should never be used for regulating flow, unless they are specifically designed for that purpose. On opening the gate valve, the flow path is enlarged in a highly nonlinear manner with respect to percent of opening.
Cast Steel Wedge Gate Valve Specifications
Design:
API 600: Bolted Bonnet Steel Gate Valve for Petroleum and Natural Gas Industries
BS 1414: Specification for Steel Wedge Gate Valves (Flanged and Butt-welding Ends) for the Petroleum, Petrochemical and Allied Industries
DIN3352: Bolted Bonnet Steel Gate Valve for Petroleum and Natural Gas 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 Unions
BB, OS&Y: Bolt Bonnet, Outside screw and Yoke
Size Range: 2" - 40"
Pressure rating: ANSI Class150LB- 2500LB
Materials:
Carbon Steel: ASTM A105, ASTM A216 WCB, ASTM A217 WC6, ASTM A217 WC9, ASTM A217 C5,ASTM A217 C12, ASTM A217 C12A
Stainless Steel: ASTM A351 CF8, ASTM A351 CF8M, ASTM A351 CF3, ASTM A351 CF3M, ASTM A351 CM8, ASTM A890 GR4A, ASTM A890 GR6A
Operation: Handwheel, Gearbox, Electric actuator, Pneumatic actuator, hydraulic actuator
Test: API598,API6D
ZC cast steel gate valves are designed and manufactured to provide maximum service life and dependability. All gate valves are full ported and meet the design requirements of API-600 and ANSI B 16.34. Valves are available in a complete range of body/bonnet materials and trims.
Bronze Gate Valve, Non Return Valve Types, Stainless Steel Gate Valves, Valve Trim Types Zhejiang Zhongcheng Valve Co.,Ltd. , http://www.apivalvestar.com
German Lloyd's Register of Shipping (GL) held an advanced shipping technology conference in Shanghai. Zhang Leshan, senior manager of the Engineering Technology Department (China), explained four major measures to reduce fuel consumption of ships, including reducing ship resistance, improving propulsion efficiency, and improving turbines. Improve operations. He pointed out that a comprehensive system approach can greatly improve the energy-saving potential of shipping, thus helping shipowners and shipping companies to make full use of technology to create a greener and more energy-efficient fleet and enhance long-term competitiveness.
Zhang Leshan pointed out that “if the additional carbon dioxide emission charges expected in the future are included, the medium and long-term fuel costs may be between 500 and 1000 US dollars per ton, which will bring greater pressure on the shipping companies and promote the shipyard. Building a more fuel efficient ship".
Improve hull line type
He said that the structural weight optimization of the ship as a comprehensive optimization method not only reduces fuel consumption, but also significantly saves steel costs and achieves other benefits. Previously, GL had helped a Chinese shipyard to optimize its structure for a series of multi-purpose vessels. Under the premise of better structural strength, each ship saved 267 tons of steel. This alone saved construction costs by about $500,000. And make the ship save a lot of fuel and increase the load when the power of the main engine is constant. If the main scale and line type of the ship are further optimized and the rudder and propeller design are improved, the fuel efficiency can be further improved.
During the voyage, the interaction between the ship's resistance, the propulsion system, and the main engine can release more fuel-saving potential than simply improving the individual system. “This aspect can use advanced CFD simulation technology to simulate the interaction between various systems of ships on a full scale, thus overcoming the errors and limitations brought by the scale effect of traditional ship model tests, and closer to shipping practice.â€
Implementing range optimization
Zhang Leshan said that in addition to optimizing construction, ship efficiency can be improved during the operational phase, mainly through various measures to improve ship operations or “voyage optimizationâ€, such as trim and ballast water optimization, and host load optimization.
In this respect, many ships at home and abroad have used ECO assistant software to help determine the best trim in the voyage of the ship, thereby improving fuel efficiency - measured by a 7,500-cargo container ship with an average annual 250-day sea flow, using ECO The fuel savings from the software can reach hundreds of thousands of dollars per year. “Even in the future, it is possible to change the speed of the ship every time you change the speed of the ship, just like changing the screw, to get the optimal fluid power.â€