There are several surface finishes available for cast pump valve parts. Some of the common surface finishes include:
1. Machined Finish: This is a standard finish achieved through machining processes. It typically has a smooth surface with visible tool marks.

2. Polished Finish: This finish involves polishing the surface to achieve a smooth and glossy appearance. It helps improve the aesthetics of the part and can also enhance corrosion resistance.

3. Nickel-plated Finish: This finish involves coating the surface with a layer of nickel. It provides enhanced corrosion resistance and can also improve the part's appearance.

4. Powder-coated Finish: In this finish, a dry powder coating is applied electrostatically and then cured under heat. It provides a durable and attractive finish that enhances the part's appearance and corrosion resistance.

5. Anodized Finish: This finish involves anodizing the surface to form a protective oxide layer. It improves corrosion resistance and can also provide a decorative appearance.

6. Painted Finish: Parts can be painted with various coatings to provide a protective layer and improve appearance. The type of paint used can depend on the specific application requirements.

7. Sandblasted Finish: This finish is achieved by blasting the surface with abrasive material, such as sand or glass beads. It creates a rough texture and can be used for aesthetic purposes or to improve adhesion for further surface treatments.