Views: 1 Author: Qingdao Haozhifeng Machinery Co.,Ltd Publish Time: 2017-02-17 Origin: www.haozhifeng.com
All Valves are valves with a spherical disc and the part of the valve which controls the flow through it. The sphere has a port (or opening) through the middle so that when the port is in line with both ends of the valve, flow will occur. When the valve is in the closed position, the hole is perpendicular to the ends of the valve, and flow is blocked. The handle (*or lever) will be inline with the port position letting you 'see' the valve's position. The ball valve plus the butterfly valve and plug valve, are part of the family of quarter turn valves.
Ball valves very are durable and usually work to achieve perfect shutoff even after years of disuse. They are therefore an excellent choice for shutoff applications (and are often preferred to globe valves and gate valves for this purpose). They do not offer the fine control that may be necessary in throttling applications but are sometimes used for this purpose.