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Bettie Boone Valves April 14th, 2019 - 12:26:06
Ever since the 60's, people have been using titanium to create titanium valves for various cars. Titanium is the metal of choice for the creation of spy planes that soar in high-altitudes, as well as nuclear submarines. This is also why the metal has been used for engine valves.
Valve response time is another important factor for us to consider. For optimum control of many processes, it is important that the valve reach a specific position quickly. A quick response to small signal changes is one of the most important factors in providing optimum process control. Valve response time includes both the valve assembly dead time, which is a static time, and the dynamic time of the valve assembly. It is important to keep the dead time as small as possible. Dead band, whether it comes from friction in the valve body and actuator or from the positioner, can significantly affect the dead time of the valve assembly.
The third one is similar to ball check valves, but the plug that seals the valve is shaped like a cone. It also can be called a lift check valve in which the disc, sometimes called a lift, can be lifted up off its seat by higher pressure of inlet or upstream fluid to allow flow to the outlet or downstream side. The cone is held on a bar, allowing it to lift out of the way when the water is flowing and drop back into place when the water is off. If water backflows through the pipe, it pushes up against the cone, creating a seal that keeps it from going any further.
Needle Valves are designed in many different materials. The valve is generally metal - here stainless steel, or a steel alloy, brass, or bronze are most often used, The seat is usually made from an elastomeric material such as PVC, CPVC, PTFE or a suitable type of the wide range of plastics and thermoplastics on the market. Valves are available in different materials - here customer choice will be determine by the specific application the valve is to be used for, along with the conditions it will be subject to. You have to take into account whether the fluid is particularly high or low in temperature, likelihood of corrosion, and how much wear the valve will be subject to you. Swagelok will be able to consult with you, and advise you what type of valve is best for the application you require it for. Swagelok Tube Fittings are available in additional Valve Body Materials on request - these include carbon steel and 25Cr super duplex stainless steel.
Why do people use titanium valves anyway? It has been found that by lessening the valve weight of an engine, there is a big impact on the reliability of an engine, as well as its performance and longevity. There have been studies that showed the performance of an engine that has steel valves compared to one that has titanium ones. Based on the sound, an engine that has titanium ones is able to accelerate a lot more smoothly. This is due to the ability of the valve springs to keep what they call the "valvetrain" under control. When the valve weight is reduced, valve springs also tend to last a lot longer, and the lifters of the engine also become more reliable. Not to mention, engines that are overhauled and fitted with valves made of titanium look a lot better than those with steel valves do. When people also use titanium valves, they will see visible results. They will be able to see that there is less wear and tear on what is called the "camshaft drive", whether it is a belt, gears, or chain.
The fourth one is the disk valve which is also known as swing check valve. It operates in the same manner as ball and cone valves, but the plug that settles over the opening is a disk. Disk and cone valves tend to wear down more because they have more moving parts and because they get bumped around on top of the flow of water when it is turned on.