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Tel: 800-543-6169 |
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Choosing the Correct Steel for Your Valve Making the correct choice of steel for your valve can directly impact how well and how long the valve will wear for you. Choosing the correct steel for your valve is usually determined by the type of materials you will be processing, the wear resistance of the steel and the brittleness of the steel at different temperatures. While we won’t attempt to go into the specifics of the hundreds of different choices, this should at least give you a general overview of the basic types that are available. Hopefully it will also provide you with a starting point for discussions with your valve manufacturer. Standard tool steel: Most companies have a standard tool steel which they have nitrided or heat treated, to provide wear resistance and lubricity. A valve made of this type of steel is usually adequate for applications processing general purpose plastics. Stainless steel: When processing resins that are mildly corrosive but non-abrasive such as flexible PVC or Polysulfone, stainless steel is usually an excellent choice. Extra hard metals: While more expensive than many other metals, very hard, long wearing metals such as CPM-9V™ are an excellent choice for resins that are fiber filled or may be otherwise abrasive. It is also an excellent choice when extended wear is important. Cost saving tip: When an extra hard metal (such as CPM-9Vtm) is desired for a valve, some manufacturers of 4-piece valves will make the ring, the seat and the flute area of CPM-9V, and the body of the valve out of a less expensive material. This type of configuration provides excellent extended wear capabilities at significantly less cost than that of an all CPM-9V valve. CPM™ stainless steel: Because it is both very hard and corrosive resistant, CPM stainless steel is often recommended for materials that are both abrasive and corrosive, such as rigid PVC. |
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