
Globe valve, also known as shut-off valve, belongs to the forced sealing type valve. Therefore, when the valve is closed, pressure must be applied to the valve disc to force the sealing surface not to leak. When the medium enters the valve from below the valve disc, the resistance that the operating force needs to overcome is the frictional force between the valve stem and the packing, as well as the thrust generated by the pressure of the medium. The force required to close the valve is greater than the force required to open it, so the diameter of the valve stem should be larger, otherwise the valve stem bending fault may occur. There are three types of connections: flange connection, threaded connection, and welded connection. After the appearance of self sealing valves, the flow of the medium in the shut-off valve is changed to enter the valve chamber from above the valve disc. At this time, under the pressure of the medium, the force to close the valve is small, while the force to open the valve is large, and the diameter of the valve stem can be correspondingly reduced. Meanwhile, under the influence of the medium, this type of valve is also relatively tight. The "Three Modernizations" of valves in our country once stipulated that the flow direction of globe valves should be from top to bottom. When the shut-off valve is opened, the opening height of the valve disc is 25% to 30% of the nominal diameter The flow rate has reached its maximum, indicating that the valve has reached the fully open position. So the fully open position of the shut-off valve should be determined by the stroke of the valve disc. The opening and closing component of a globe valve is a plug shaped valve disc, with a flat or conical sealing surface. The valve disc moves linearly along the centerline of the valve seat. The movement form of valve stem, commonly known as concealed stem, can also be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal, and radioactive media through lifting and rotating stem. Therefore, this type of shut-off valve is very suitable for use as a cut-off, regulating, and throttling valve. Due to the relatively short opening or closing stroke of the valve stem and its highly reliable shut-off function, as well as the proportional relationship between the change in the valve seat opening and the stroke of the valve disc, this type of valve is very suitable for regulating flow.


Company Profile
Shanghai Power Station Valve Factory Co., Ltd. was founded in 1966 and is located in Qingpu Park, Zhangjiang High tech Industrial Development Zone, Shanghai. The company was formerly known as Shanghai Power Station Valve Factory. After more than 50 years of entrepreneurship, creation, and innovation, the SDF brand is now a professional factory designated by the Ministry of Machinery and the State Power Corporation to produce high-temperature and high-pressure power station valves. It is a recommended enterprise for the main auxiliary equipment of 660MW and 1000MW thermal power units by the Power Planning and Design Institute, as well as recommended enterprises for the main auxiliary equipment of 660MW and 1000MW thermal power units by Huaneng, Huadian, Datang, State Power Investment, State Energy Investment, and various local power groups. It is also a member unit of the China Petroleum and Sinopec Equipment Industry Association.
The company has complete production equipment and sophisticated testing methods. The company's new factory covers an area of 73336 square meters, with a total investment of several billion yuan. The company has introduced major equipment such as "Olympus" optical emission direct reading spectrometer, ray flaw detection room, ultrasonic flaw detector, DP600 sealing surface plasma spray welding machine, 1800t high pressure large diameter valve Pressure testing machine, DN4000 CNC vertical machining machine tool, machining center, etc., so that the product processing and manufacturing capacity and testing level have been rapidly improved and improved. At present, the production capacity of 800000 sets of forged steel valves per year has been formed.
The company has passed various qualification certificates such as the three system certification (quality, environment, occupational health and safety management system), A1, A2, B level (gate valve, globe valve, check valve, regulating valve, ball valve, butterfly valve, ultra-low temperature valve, etc.) of special equipment production license qualification, API certification, EU CE certification, etc. earlier in the same industry. The company has modern testing methods including mechanical properties, spectroscopy, metallography, PT, UT, RT, MT, etc. The factory and type testing capabilities of the valve include high and low pressure water or gas testing, high and low temperature valve testing, valve fire testing, valve low leakage testing, valve switch cycle life, valve flow measurement testing, valve vacuum testing, etc. The valve testing process has obtained third-party certification certificates.
The main products produced include gate valves, globe valves, check valves, ball valves, butterfly valves, regulating valves, drain valves, instrument valves, etc; Mainly covering industries such as electricity, chemical (coal chemical/refining/fine chemical), natural gas, petrochemicals, metallurgy, nuclear power, etc. More than 2000 types and specifications of valves; Valve body materials include carbon steel, stainless steel, alloy steel, low-temperature steel, and various special materials; Pressure: 1.6MPa~80.0MPa, Class150~Class4500; The nominal Size ranges from DN10mm to 6000mm, and the temperature ranges from -196 ℃ to 1100 ℃. The driving modes include manual, gear transmission, electric, pneumatic, and hydraulic; The product adopts standards such as NB/T, GB, JB, ANSI, API, JIS, BS, DIN, GOST, NF, etc. While the company attaches great importance to domestic market sales, its products are also exported to countries such as Europe, America, Pakistan, India, Japan, Iran, Indonesia, Bangladesh, the Philippines, and Malaysia.
Adhering to the core concept of "integrity, innovation, exploration, and win-win", Shanghai Power Station Valve Factory Co., Ltd. is committed to researching valve technology for harsh working conditions, providing customers with systematic valve application solutions, and building a national brand of industrial valves!

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