Needle valves are often designed with a metal needle valve (generally brass,bronze,or stainless or other alloys of steel) and an elastomeric seat (generally PVC,CPVC,PTFE,or a wide range of brand name plastics and thermoplastics. ) While this is the most common form,valves are available that have metal - metal,plastic - plastic,or plastic- metal needles and seats. These variations are usually designed with specific applications in mind, especially situations where corrosion,high or low temperatures or extensive wear are possible. In such cases,it is best to consult with the manufacturer ti find which type of valve is best for the application at hand

Needle valves are often designed with a metal needle valve (generally brass,bronze,or stainless or other alloys of steel) and an elastomeric seat (generally PVC,CPVC,PTFE,or a wide range of brand name plastics and thermoplastics. ) While this is the most common form,valves are available that have metal - metal,plastic - plastic,or plastic- metal needles and seats. These variations are usually designed with specific applications in mind, especially situations where corrosion,high or low temperatures or extensive wear are possible. In such cases,it is best to consult with the manufacturer ti find which type of valve is best for the application at hand