CE API ANSI DN50/150/300/450 High Pressure High Temperature Forged Steel A105 Wcb Cast Steel Flange Gate Valve for Oil Gas Steam

A gate valve is a type of valve commonly used to control the flow of liquids and gases in a pipeline. It is characterized by a flat or wedge-shaped gate that moves up and down to open or close the passage. Gate valves are often used when a straight-line flow of fluid and minimal flow restriction are desired.

Key Features of Gate Valves:

1. Design:

   • The gate moves perpendicular to the flow path to either block or allow the flow.
   • Available in rising-stem or non-rising-stem designs, depending on the application and space requirements.

2. Applications:

   • Suitable for on/off control rather than flow regulation.
   • Commonly used in water supply systems, wastewater treatment, oil and gas pipelines, and chemical processing plants.

3. Advantages:

   • Offers minimal pressure drop when fully open.
   • Provides a tight seal, reducing leakage.

4. Limitations:

   • Not ideal for throttling as it may cause wear on the gate and seat.
   • Takes more time to open or close compared to other valve types like ball valves.

5. Materials:

   • Typically made from cast iron, stainless steel, carbon steel, or bronze, depending on the application environment and fluid type.

6. Types:

   • Parallel Gate Valve: Features a flat gate between two parallel seats.
   • Wedge Gate Valve: The gate is wedge-shaped, providing better sealing but requiring more precision.