Many materials of needle valves
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.
Needle valves are used whenever control or metering of steam, air, gas, oil, water or other non-viscous liquids is required. This means they are used in almost every industry over a massive range of applications. Swagelok Valves are all factory tested with nitrogen at 1000 psig (69) bar to ensure that seats have a maximum allowable leak rate of 0.1 stdcm3/minute, and shell testing is performed to a requirement of no detectable leakage with a liquid leak detector.
