A Ball valve is a quarter-turn rotational motion valve that uses a ball-shaped disk to stop or start flow. If the valve is opened, the ball rotates to a point where the hole through the ball is in line with the valve body inlet and outlet. If the valve is closed, the ball is rotated so that the hole is perpendicular to the flow openings of the valve body and the flow is stopped.
Ball valves are basically available in three versions: full port, regular port and reduced port. The full-port valve has an internal diameter equal to the inner diameter of the pipe. Regular and reduced-port versions generally are one pipe size smaller than the line size.
Ball valves are manufactured in different body configurations and the most common are:
The valve ends are available as butt welding, socket welding, flanged, threaded and others.
Balls are usually made of several metallics, while the seats are from soft materials like Teflon®, Neoprene, and combinations of these materials. The use of soft-seat materials imparts excellent sealing ability. The disadvantage of soft-seat materials (elastomeric materials) is, that they are not can be used in high temperatures processes.
The stem in a Ball valve is not attached to the ball. Usually it has a rectangular portion at the ball, and that fits into a slot cut into the ball. The enlargement permits rotation of the ball as the valve is opened or closed.
The Bonnet of a Ball valve is fastens to the body, which holds the stem assembly and ball in place. Adjustment of the Bonnet permits compression of the packing, which supplies the stem seal. Packing material for Ball valve stems is usually Teflon or Teflon-filled or O-rings instead of packing.
The following are some typical applications of Ball valves:
The comprehensive range of Swing Check Valves can be installed in horizontal as well as vertical lines. The Swing Check Valve, like all Check Valves, is used to prevent back flow in the line. The resultant pressure drop is minimal.
As the pressure below the disc increases it raises up from the seat to allow the flow. The valve closes with a drop in pressure on the inlet side and a build up of pressure on the outlet side. The disc is held in closed position owing to the back pressure in the line.
Wide range of sizes in check valves right from 2†to 24†(DN- 50 to DN -600) and pressure rating ranges from #150 to #2500. Higher pressure rating and bigger sizes can also be provided. All valves are manufactured in accordance with the latest industry standards.
The Lift Check Valves are designed to suit multiple applications; ideally where flow characteristics are such that it requires better flow control. Our specialised design on lift check valve helps to prevent flow reversals.
Forged Steel Valves are available in forged carbon steel, alloy steel and stainless steel materials with sizes ranging from 15 mm to 50 mm. These Valves are available in full port and reduced port type openings, and typically available in socket weld ends. Flanged or butt-weld ends can be provided in case of specific requirements. All valves are manufactured in accordance with the latest industry standards.
A Plug Valve is a quarter-turn rotational motion Valve that use a tapered or cylindrical plug to stop or start flow. In the open position, the plug-passage is in one line with the inlet and outlet ports of the Valve body. If the plug 90° is rotated from the open position, the solid part of the plug blocks the port and stops flow. Plug valves are similar to Ball valves in operation.
Plug valves are available in a non-lubricated or lubricated design and with several styles of port openings. The port in the tapered plug is generally rectangular, but they are also available with round ports and diamond ports.
Plug valves are also available with cylindrical plugs. The cylindrical plugs ensure greater port openings equal to or larger than the pipe flow area.
It are provided with a cavity in the middle along there axis. This cavity is closed at the bottom and fitted with a sealant-injection fitting at the top. The sealant is injected into the cavity, and a Check Valve below the injection fitting prevents the sealant from flowing in the reverse direction. The lubricant in effect becomes a structural part of the Valve, as it provides aflexible and renewable seat.
It contain an elastomeric body liner or a sleeve, which is installed in the body cavity. The tapered and polished plug acts like a wedge and presses the sleeve against the body. Thus, the nonmetallic sleeve reduces the friction between the plug and the body.
A Plug Valve can be used in many different fluid services and they perform well in slurry applications.
The following are some typical applications of Plug valves:
A Butterfly valve is a quarter-turn rotational motion valve, that is used to stop, regulate, and start flow.
Butterfly valves are easy and fast to open. A 90° rotation of the handle provides a complete closure or opening of the valve. Large Butterfly valves are usually equipped with a so-called gearbox, where the handwheel by gears is connected to the stem. This simplifies the operation of the valve, but at the expense of speed.
A Butterfly valve can be used in many different fluid services and they perform well in slurry applications.
The following are some typical applications of Butterfly valves:
A safety Valve is a pressure Relief Valve actuated by inlet static pressure and characterized by rapid opening or pop action. (It is normally used for steam and air services.)
A low-lift safety Valve is a safety Valve in which the disc lifts automatically such that the actual discharge area is determined by the position of the disc.
A full-lift safety Valve is a safety Valve in which the disc lifts automatically such that the actual discharge area is not determined by the position of the disc.
A Relief Valve is a pressure relief device actuated by inlet static pressure having a gradual lift generally proportional to the increase in pressure over opening pressure. It may be provided with an enclosed spring housing suitable for closed discharge system application and is primarily used for liquid service.
A safety Relief Valve is a pressure Relief Valve characterized by rapid opening or pop action, or by opening in proportion to the increase in pressure over the opening pressure, depending on the application and may be used either for liquid or compressible fluid.
A conventional safety Relief Valve is a pressure Relief Valve which has its spring housing vented to the discharge side of the Valve. The operational characteristics (opening pressure, closing pressure, and relieving capacity) are directly affected by changes of the back pressure on the Valve.
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A balanced safety Relief Valve is a pressure Relief Valve which incorporates means of minimizing the effect of back pressure on the operational characteristics (opening pressure, closing pressure, and relieving capacity).
A pilot operated pressure Relief Valve is a pressure Relief Valve in which the major relieving device is combined with and is controlled by a self-actuated auxiliary pressure Relief Valve.
A vacuum Relief Valve is a pressure relief device designed to admit fluid to prevent an excessive internal vacuum; it is designed to reclose and prevent further flow of fluid after normal conditions have been restored.
Diaphragm valves are used for on/off and throttling service for liquids, slurries and vacuum/gas.
Chemical, Fossil Power Plants, Pharmaceutical, Mining, Nuclear Power Plants, Water Treatments, etc.
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