Principles for Selecting Needle Valves and Corrosion-Prevention Measures

Release date:

2022-01-11

Corrosion protection for needle valves is primarily considered in relation to the valve body, which is typically made of stainless steel or carbon steel. Although a wide variety of corrosion‑resistant materials and techniques are available, applying them appropriately remains challenging, as corrosion is a complex and demanding issue. Material selection also presents significant difficulties: one must not only account for corrosion resistance but also ensure adequate pressure and high‑temperature tolerance. When operating under moderate pressure and temperature conditions, using nonmetallic materials for the valve body often provides effective corrosion protection; additionally, the external surface of the needle valve’s body is subject to atmospheric corrosion and is usually protected by painting.

　　Corrosion protection for needle valves is primarily considered in relation to the valve body, which is typically made of stainless steel or carbon steel. Although a wide variety of corrosion‑resistant materials and techniques are available, applying them appropriately remains challenging, as corrosion is a complex and demanding issue. Material selection also presents significant difficulties: in addition to corrosion resistance, factors such as pressure rating and high‑temperature performance must be taken into account. When operating under moderate pressure and temperature conditions, using nonmetallic materials for the valve body can often provide effective corrosion protection; moreover, the external surface of the needle valve’s body is subject to atmospheric corrosion, so paint coating is commonly employed for added protection.

Leakage caused by the sealing performance of precision stainless steel ferrules.

Daily Maintenance and Operating Environment of Needle Valves