Typically, gates used in hydraulic engineering should be protected from corrosion, primarily because cast iron gates are often submerged in water and prone to rust. This is harmful to the safe operation and activation of the gates. Therefore, anti-corrosion measures should be taken before installing the gates. Anti-corrosion measures are generally categorized into three types:

1. Metal Spray for Cast Iron Gates: Apply stainless steel spray to the gate surface for corrosion resistance. If possible, it is recommended to be sprayed at the factory. After installation, lift it with asphalt or other sealants.

Zinc, aluminum, and other materials can be used for anti-corrosion coatings on metal surfaces, with the spray thickness typically around 0.3mm.

Prior to painting, the surface of the cast iron gate should be sandblasted to remove the old charged layer and rust, ensuring the surface is rough to promote the adhesion of the paint layer.

2. Cast Iron Gate Coating Protection:

(1) Use the following paints in frequently damp areas:

3. External Current Protection and Corrosion Coating

(1) Select the protective potential. The appropriate protective potential should be determined based on water quality, gate surface condition, and gate material.

(2) Anode Materials and Arrangement: Anode materials can be of standard steel, and dissolvable metals such as high-pressure cast iron and aluminum-silver alloy can be used if required.

(3) Coating Selection for Cast Iron Gate: Choose from the following coatings for cast surfaces with cathodic protection.

The cast iron gate valve features an overhead-mounted structure, which reduces the number of connecting bolts on the valve body under high pressure and large diameter conditions, enhancing the valve's reliability and overcoming the impact of system weight on the normal operation of the valve.
Cast iron gate valves are widely used in pipelines in the coal chemical, petrochemical, rubber, and papermaking industries as devices for分流/合流 or flow direction switching.