Butterfly valve designs use a hard seat and an O-ring or piston ring around the disk to seal. Butterfly valve may include an angularly offset and disca pressure-tight resilient seat . Butterfly valvesrange in size from small to enormous, and are well suited for large flows of gases, liquids, or slurries, offer a number of advantages when used for the proper application. They may be used in a wide variety of chemical services, they are available with small dimensions allowing for use in areas where space is limited, and they allow a high coefficient of flow. Conversely, the design of butterfly valve creates the disadvantage of not being easy to clean, and therefore should be avoided in situations that call for sterile, medical or food processing applications. Additionally, some styles may have difficulty dispensing slurries.
http://www.cgvalve.com/butterfly-valve.html
Wednesday, May 23, 2007
Sunday, May 20, 2007
Check valve
Check valve
Check valves are generally used in drip irrigation emitters and irrigation sprinklers.Check valves are available in three bonnet designs. The first design is the bolted bonnet, with male-female joint, spiral wound gasket. The second design is the welded bonnet, with a threaded and seal welded joint. On request a full penetration strength welded joint is available. The other design is the pressure seal bonnet, with a threaded and pressure seal bonnet joint.There are three different design configurations of the check valves. They are piston check, swing check, and ball check designs.
Friday, May 18, 2007
Globe Valve
High Performance Forged One-Piece Globe Valve
- Easy disassembly and quickNo WeldsTo Remove
Designed for tough service
High Pressure-temperature Service with Low Fugitive Emmissions
Non-rotating stemand non-rising handwheel
The only valve with 22 design featuresfor high pressure steam and other tough services
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