Ball valve features and selection

Posted by uuuseff on November 18th, 2019

Ball valve is evolved from the cock, and its opening and closing pieces as a sphere, the use of the ball around the axis of the stem rotated 90 degrees to achieve the purpose of opening and closing. The ball valve is mainly used to cut off, distribute and change the medium flow direction in the pipeline. The ball valve designed with V-shaped opening also has good flow regulation function. The ball valve not only has the advantages of simple structure and good sealing performance, but also has the advantages of small volume, light weight, less material consumption, small installation size, small driving torque, easy operation and quick opening and closing in a certain nominal diameter range, and is near One of the fastest growing valve varieties in more than a decade. Especially in the developed countries such as the United States, Japan, Germany, France, Italy, the West, Britain and other developed countries, the use of ball valves is very wide, the varieties and quantities are still expanding, and to the high temperature, high pressure, large mouth, high sealing, long Life expectancy, excellent regulation performance and multi-functional development of a valve, its reliability and other performance indicators have reached a high level, and has partially replaced the gate valve, globe valve, throttle valve. As the ball valve technology advances, in the foreseeable short-term, especially in the oil and gas pipelines, refinery cracking unit and the nuclear industry will have a wider range of applications. In addition, ball valves will also be one of the leading types of valves in large and medium caliber, medium and low pressure applications in other industries. The working principle of the ball valve is to rotate the valve stem to make the valve clear or blocked. Ball valve switch is light, small size, can be made of large diameter, reliable sealing, simple structure, easy maintenance, sealing surface and the spherical surface is often closed, easy to be media erosion, widely used in various industries. Ball valve and plug valve are of the same type of valve, and only its closure is a sphere, the sphere around the centerline of the valve body to rotate to achieve open, close a valve. Ball valve is mainly used in the pipeline to cut off, distribute and change the flow direction of the medium. Ball valve is widely used in recent years, a new type of valve, which has the following advantages: 1. Fluid resistance is small, the resistance coefficient and the same length of the pipe section. 2. Simple structure, small size, light weight. 3. Tight and reliable, the current ball valve sealing surface material widely used plastic, good sealing, vacuum system has also been widely used. 4. Easy to operate, quick opening and closing, as long as 90 ° rotation from full open to full close, easy to remote control. 5. Easy maintenance, ball valve structure is simple, the seals are generally active, demolition and replacement are more convenient. 6. In the fully open or fully closed, the ball and valve seat sealing surface and media isolation, the media will not cause erosion of the valve sealing surface. 7. Wide range of applications, the path from small to a few millimeters, up to a few meters, from high vacuum to high pressure can be applied. Ball valves have been widely used in petroleum, chemical, liquefied gas, water supply and drainage, food, pharmaceutical, power generation, paper making, urban construction, mining, boiler steam system, municipal, atomic energy, aviation, rockets and other departments, as well as people's daily lives. Ball valve is mainly used to connect or block the pipeline medium, especially used in areas requiring quick opening and closing better, such as emergency unloading and other places. Due to its simple structure, small parts, light weight, good sealing performance, the application is more widely used. Structure: Mainly by the valve body, valve cover, seal seat, ball and stem and other components. The ball with a hole is the core of the ball valve, the ball by the rotation of the stem to control the opening and closing, the rotation is the full switch. Ball valve can be divided into two kinds of floating ball valve and fixed ball valve. Floating ball valve is characterized by the ball can float freely. According to the different structure of the seal seat is divided into fixed seal seat and seal seat with activities of two. Floating ball valve fixed sealing seat, the structure shown in the body with two fluoroplastics sealed fixed seat, between the two clamps in a floating ball made of carbon steel or stainless steel , The ball has a circular through hole, open the rear, the channel opens; when the valve stem rotates, the ball hole perpendicular to the valve channel, by the pressure of the media will be pressed on the ball seat in the back, to ensure that the valve seal. The main selection of the principle of the ball valve: 1, the main oil and gas pipelines, need to clean the pipeline, but also need to be buried in the ground, the choice of all-pass, all-welded ball valve; buried in the ground, choose full- Or flanged ball valve; branch pipe, the choice of flange connection, welding connection, full or reduced diameter ball valve. 2, refined oil pipeline and storage equipment, the choice of flanged ball valve. 3, the city gas and natural gas pipeline, the choice of flange connection and internal thread floating ball valve. 4, oxygen pipeline system in the metallurgical system, should be used after strict degreasing, flanged fixed ball valve. 5, low temperature medium piping systems and devices, should use the valve cover with a low temperature valve. 6, refining unit of the catalytic cracking unit piping system, the choice of lifting rod valve. 7, acid and alkali chemical systems and other corrosive media devices and piping systems, should be made of austenitic stainless steel, PTFE valve seat ring all stainless steel ball valve. 8, metallurgical systems, power systems, petrochemical plants, urban heating systems in high temperature medium piping system or device, the choice of metal to metal seal ball valve. 9, the need for flow control, the choice of worm gear drive, pneumatic or electric with V-shaped opening of the regulating valve. 1, customer purchase list fax to, or contact us 2, received the customer purchase list, to provide customers with valve model selection and pricing (price list). 3, the specific agreed: delivery, special requirements and other matters.

Solar Home System

Solar System,Solar Panel,PV Panel

Mono Solar Panel ,Monocrystalline Solar Panel Co., Ltd. , http://www.chsolarpanels.com