A ball valve casting manufacturers is a quarter-turn shut-off valve that regulates fluid flow by rotating a ball with a hole. Choosing the suitable ball valve material is an important stage in the ball valve choosing process. Several materials, including stainless steel, carbon steel, and brass, can be utilized to make these valves’ housing, ball, and seal, depending on the medium and the climate. This article highlights the most common materials used to manufacture ball valves.
Materials for ball valves
The most common housing materials used in ball valves are stainless steel, brass, and PVC (polyvinyl chloride). The ball is often constructed of chrome-plated steel, brass, PVC, or stainless steel. valve casting manufacturers are often constructed of Teflon but can also be formed of metals or other synthetic materials. For additional information, see our page on the chemical resistance of materials.
Ball valves made of PVC
Most acids, bases, salt solutions, and organic solvents do not affect PVC (Polyvinyl chloride). PVC is inexpensive (save for ISO-top valves) and widely used in water supply, irrigation, and drainage with corrosive media. PVC cannot withstand temperatures above 60°C and is not resistant to aromatic or chlorinated hydrocarbons.
Ball valves made of brass
Brass is more costly than plastic because it is more robust. Because brass can take more excellent heat than plastic, brass ball valves are an excellent choice for household plumbing applications. Because lead is occasionally added to brass (usually less than 2%), use a lead-free variety for ball valve casting manufacturers involving drinking water.
Dezincification is a kind of corrosion that occurs when zinc is lost from an alloy, resulting in a porous structure with drastically reduced mechanical strength. The brass casing saves money while withstanding high pressure, temperature, and flow rate applications.
- KTW and DVGW approve ball valves for drinking water applications.
- Ball valves for gas applications are approved by DIN-EN 331 and DVGW.
- Ball valves for oxygen applications are composed of non-contaminating materials.
Ball valves made of stainless steel
Stainless steel is a challenging and robust metal commonly utilized in high-temperature and high-pressure applications. Compared to brass, stainless steel is more resistant to corrosion and leakage. Because stainless steel 316 is exceptionally resistant to chlorides, ball valves constructed from it may be utilized in marine situations.
Ball valves made of bronze
Bronze is a copper-tin alloy that is robust and pliable (it does not shatter easily). Bronze parts are formed by casting the material into a mold or creating a pre-cast bronze ingot. Bronze alloys with selected additions can keep their surface polished.
Ball valves made of cast iron
Cast iron is a material composed of 96-98% iron, 2-4% carbon, and trace quantities of silicone. Cast iron has a high-temperature tolerance; some cast iron can withstand temperatures above 21000F. (11500C). Class 125 cast iron flanges are rated for pressures ranging from 150 to 200 psi at low temperatures.
Materials for ball valve seals
The different seal materials used in ball valves are explained further below. More information on the appropriateness of a material with the various media used in the ball valve may be found on our page on the chemical resistance of materials.
- NBR (Nitrile rubber)
NBR is resistant to regular wear and tear as well as compression. The material is appropriate for ball valves using media such as oil products, solvents, and alcohol but not for polar solvents or braking fluids. NBR is susceptible to weather changes.
- FKM (Viton)
Seals are incredibly resistant to media, aging, and ozone. FKM is better suited for medium-high temperature ball valve applications than PTFE due to its increased heat resistance. In addition, FKM outperforms PTFE in strength, sealing ability, and flexibility.
EPDM is resistant to water, steam, and alcohol but not oil or general solvents. Compared to FKM, EPDM is less expensive, costing around one-eighth of the price.
Brass, stainless steel, and PVC are the most popular ball valve casting manufacturers The ball is often constructed of chrome-plated steel, brass, stainless steel, or PVC. Seats are frequently constructed of Teflon. However they can also be composed of other synthetic materials or metals.
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