1. What is the primary function of gate valves?
According to the information provided, what is the primary purpose of gate valves?
Explanation: Gate valves are primarily used for on/off control of fluid flow, making them suitable for applications where infrequent operation is required.
2. When are gate valves ideal for use?
According to the information, in what applications are gate valves considered ideal?
Explanation: Gate valves are ideal for infrequent operation and fully open/closed applications, such as on/off control of a pipeline.
3. What are the advantages of gate valves?
According to the information, what are the advantages of using gate valves?
Explanation: Gate valves offer tight shutoff, high capacity, and low cost among their advantages.
4. What is a disadvantage of gate valves?
According to the information, what is a drawback or disadvantage of using gate valves?
Explanation: A disadvantage of gate valves is that they can cavitate at low pressure drops.
5. In which applications are gate valves commonly used?
According to the information, in which of the following applications are gate valves commonly employed?
Explanation: Gate valves are commonly used in infrequent operation, fully open/closed, and high-pressure drop applications.
6. How is manual operation achieved in gate valves?
According to the information, how is manual operation accomplished in gate valves?
Explanation: Manual operation in gate valves is achieved through a multiturn hand wheel gear shaft assembly.
7. What is typically required for automating gate valves?
According to the information, what type of actuator is typically required to automate gate valves?
Explanation: Multiturn electric actuators are typically required to automate gate valves, although long stroke pneumatic and electro-hydraulic actuators are also available.
Short Article on Gate Valves
Gate Valves
Gate valves are a type of isolation valve that uses a sliding disc (gate) to control the flow of fluid. They are characterized by their high capacity, tight shutoff, and low cost. Gate valves are ideal for applications where infrequent operation is required, such as on/off control of a pipeline. They are also well-suited for high pressure drop and high temperature applications.
Recommended uses:
- Fully open/closed, non-throttling applications
- Infrequent operation
- Applications where minimal fluid trapping in the line is desired
Advantages:
- High capacity
- Tight shutoff
- Low cost
- Little resistance to flow
Disadvantages:
- Poor control
- Can cavitate at low pressure drops
- Cannot be used for throttling
Applications:
- Oil
- Gas
- Air
- Slurries
- Heavy liquids
- Steam
- Noncondensing gases
- Corrosive liquids
Manual operation is accomplished through a multi-turn hand wheel gear shaft assembly. Multiturn electric actuators are typically required to automate gate valves, however long stroke pneumatic and electro-hydraulic actuators are also available.
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