3d开机号试机号开奖结果列表 www.bcrkor.com.cn Ball valve takes ball with circular hole as opening and closing element. The ball is driven by valve stem to rotate 90°around valve stem to perform opening and closing. The valve is used to cut off or switch on the medium within pipeline, and widely used in petroleum refining, long-distance transportation pipeline, chemical, paper making, pharmaceutical, water conservancy, electric power, municipal and steel, etc. Special consideration is made to strength, safety, resistance to harsh environment during design. It's suitable for various corrosive and non-corrosive mediums. Different materials may be selected for transportation of water, steam, oil, natural gas, nitric acid, acetic acid, oxidant and urea. Ball valve has compact structure and reliable sealing. Its sealing surface and spherical surface are closed normally which make it resistant to flush erosion by the medium, and easy to operate and repair.
Opening and closing part of gate valve is flashboard. Its direction of motion is perpendicular to the direction of fluid. The valve is usually used to cut-off medium. The entire flow channel is a straight-through passage when the valve is fully-open, and the pressure loss of medium running is minimum. Gate valve is usually divided into several types by seal part mode, such as: wedge gate valve, plate gate valve, parallel 2-flashboard gate valve, wedge 2-flashboard gate valve. Gate valve is usually for working condition in which the valve is not opened or closed frequently, and supports flashboard fully open or fully closed. It's not suitable for adjustment or throttling. Different materials may be selected for transportation of water, steam, oil, natural gas, nitric acid, acetic acid, oxidant and urea.
Globe valve is a kind of valve with closing part making a linear motion along the center line of valve seat. As the opening and closing stroke of valve stem is relatively short, and with reliable cut off function, and the change of valve seat orifice and stroke of valve clack are proportional, the valve is really suitable for flow regulating. It may be used for cut off or regulating as well as throttling of fluid pipeline for city water, sewage, construction, food, electric power, medicine, metallurgy and textile.
Check valve is also known as one-way valve or non-return valve. It's a kind of valve with opening and closing part opens and closes automatically driven by flow and force of medium to prevent backflow of medium. Check valve is automatic valve, and mainly applied on pipeline with medium flows in one direction. The medium is allowed to flow only in one direction to prevent accident. BTL mainly manufactures four types of check valve: swing check valve, lifting check valve, tilting disc check valve and wafer check valve.
Butterfly valve is a kind of vale that takes a disc as closing part (butterfly board) which rotates around the valve axis to achieve opening and closing. The valve is mainly for cut-off and throttling on pipeline. Butterfly board is driven by the valve stem. A opening and closing is completed as it rotates 90°. The flow of medium may be controlled by changing of deflection angle of butterfly board. Commonly used butterfly valve includes wafer butterfly valve, lug butterfly valve and flange butterfly valve. Butterfly valve is suitable for pipeline that transports various corrosive, non - corrosive fluids in producer, coal gas, natural gas, liquefied petroleum gas, city gas, hot and cold air, chemical smelting and power environmental protection, building water supply and drainage and other engineering systems for regulating and cut-off of medium flow.
Strainer is one of the indispensable devices on medium transportation pipeline. It's usually installed on the input end of pressure reducing valve, pressure release valve, level control valve or other equipment. It's used to Strainer impurities in medium. It can Strainer rust, sand in sewage, small amount of solid particles in liquid and other impurities to protect normal operation of valve and equipment. Working principal: when fluid enters Strainer cartridge equipped with Strainer screen, the impurities are blocked, and clean filtrate is drained through Strainer outlet. For cleaning, just need to take the removable cartridge out and install it again after treatment.
Valve for medium with temperature of -40℃ to -196℃ is called cryogenic valve. Cryogenic valve includes cryogenic ball valve, cryogenic gate valve, cryogenic globe valve, cryogenic check valve and cryogenic throttle valve. It's mainly for ethylene, liquefied natural gas device, natural gas LPG LNG storage tank, air separation equipment, petroleum and chemical end gas separation equipment, liquid oxygen, liquid nitrogen, liquid argon, carbon dioxide cryogenic storage tank and tanker and other device. The output low temperature liquid medium is not only flammable and explosive, it's gasified when heating-up, and the volume expands hundreds times after gasification.
Bellows valve is a kind of valve that takes bellows as valve stem seal element. It is commonly used for application with strict valve stem sealing requirement, such as high vacuum application and nuclear industry. Replace stuffing box in common valve with bellows or use with stuffing box can make no leakage at valve stem part to prevent leakage of radioactive material or valuable material, or maintain a high vacuum. Bellows extends and retracts with lifting of valve stem. The maximum working pressure determined by compression strength and fatigue strength of bellows.