Spring-Loaded PTFE Packing Arrangements – Spring-loaded PTFE packing arrangements are very common. A spring loaded PTFE arrangement is illustrated in Figure 26. The packing box…

Figure 24 shows the gaskets that are included in a standard cage-guided valve. Spiral-Wound Gasket – Temperature gradients can cause the combined height of the…

Erosion concerns deal with the ability of a selected material to resist the wear that results from the impingement of dirt, scale, sand, vapor droplets,…

NACE MR0175 – The National Association of Corrosion Engineers (NACE) has issued Standard MR0175 that specifies proper materials, heat-treating conditions, and strength levels that are…

H 2S and SSC – A form of corrosion that is routinely encountered in oil and gas production applications is sulfide stress cracking, or SSC.…

Saudi Aramco Engineering Standard SAES-L-008 is titled Selection of Valves. Table I of this standard includes fluid and material compatibility guidelines. An excerpt from Table…

The Alloy Casting Institute (ACI) has developed a system for designating stainless and heat resistant casting alloys. As Figure 14 shows, casting designations begin with…

UNS designations have been jointly developed by the Society of Automotive Engineers (SAE) and the American Society for Testing and Materials (ASTM). This system provides…

General Properties Of Materials Following is a list of materials that are commonly specified for control valves: • Cast iron is a low cost, non-ductile…

Major Selection Considerations Previous sections have shown how the construction materials influence the pressure, pressure drop, and temperature ratings of a particular valve type. Material…