Edwina Dorsey Valves April 14th, 2019 - 12:34:49
A valve is a device which controls the flow rate, pressure or the direction. The controlled fluid can be the liquid, gas, the mixture of gas and liquid or the mixture of solid and liquid. The valve usually is composed of body, seat, bonnet, parts for opening or closing, actuating device, sealing element and so on. The controlling function of the valve depends on the actuating device or the movement of the fluid which drives the sliding, rotating or turning of the parts for opening or closing to change the area of the flow passage.
Ball - the heart of the valve. Leading manufacturers attach great importance to the quality of the surface of ball valves. Brass Balls are diamond grinding, they applied anticorrosion coating of nickel or chromium. As a result, the ball gets a perfect mirror surface. Symptom of products of low quality - a dim, muddy or rough surface of the ball.
The original principle of the operation of a valve was ingeniously basic. Operators were able to process the sometimes corrosive and abrasive water, generally caused by flooding, but the use of a "pinching" action that pressed down on a component now known as an elastomer sleeve, restricted the flow of water. This innovation was the foundation for the sophisticated Air operated Pinch Valves of today.
According to particular designs, this valve is separated into various groups. The most popular valves are the solid wedge valve and flexible wedge. There are various kinds of bendable wedge valve that uses double disc parts that are bendable. The most common and widely utilized flexible wedge valve is the parallel side valve. Valves such as these are highly utilized in stem systems because it can endure contraction and expansion in the ever-changing climate conditions.
Ball valves are usually quarter turn valves (as we turn the lever by 90 degrees to start or stop the flow) and use a hollow, perforated and pivoting ball that is also called as a floating ball. It is through this valve that the flow of fluids takes place. When the lever or handle is turned to 90 degrees, the hole of the ball gets aligned with the pipe opening and starts the flow. When again the lever is turned by 90 degrees, the hole turns around and the ball blocks the opening of the pipe thus causing the flow to stop.
There are many types of ball valves that are extensively used in various industries depending upon their designs, sizes and pressure handling capacities. Full port, reduced port, cavity filler, V port, trunnion ball valves and multiport valves are the common ones.