Homework 5

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School

Houston Community College *

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Course

2420

Subject

Mechanical Engineering

Date

Dec 6, 2023

Type

docx

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Uploaded by MagistrateOxide25230

1. List the names of the nine different valves.  Gate Valve  Globe Valve  Check Valve (Non-return Valve)  Ball Valve  Butterfly Valve  Diaphragm Valve  Plug Valve  Multiport valve  Pressure Relief Valve (Safety Valve) 2. What are gate valves and their purpose? Gate valves are used to control the flow of liquids by raising or lowering a gate (a wedge- shaped disc) inside the valve body. They are primarily designed for on/off isolation and are not ideal for fine flow control. 3. What are globe valves and their purpose? Globe valves regulate the flow of fluids by adjusting the position of a disc or plug that moves perpendicular to the flow. They are commonly used for precise flow control and throttling applications. 4. What are check valves and their purpose? Check valves allow fluid to flow in one direction only, preventing backflow. They are used to maintain the integrity of pipelines and prevent reverse flow. 5. What are ball valves and their purpose? Ball valves use a spherical disc to control the flow of fluids. They are versatile and can be used for on/off control as well as throttling applications. They provide a tight seal when closed. 6. What are Butterfly valves and their purpose? Butterfly valves use a disc that rotates within the pipe to control flow. They are often used for large-scale applications and offer quick shutoff capabilities. 7. List the valve components.  Valve Body.  Bonnet.  Disc or Plug.

 Stem.  Seat.  Actuator.  Packing or Seals.  Yoke.  Handwheel or Lever.  Bolts, Nuts, and Gaskets. 8. What is the purpose of Relief and Safety valves? Relief valves are designed to release excess pressure from a system to prevent over pressurization. They open when the pressure in the system exceeds a predetermined setpoint and reclose when the pressure returns to a safe level. 9. What are Control Valves? Control valves are used to modulate the flow of fluids in response to signals from a controller or process automation system. They maintain precise control over flow rates, pressure, temperature, or other process variables. 10. What are potential valve problems?  Leakage: Failure to create a tight seal, leading to fluid leakage.  Wear and Tear: Degradation of valve components over time.  Corrosion: Deterioration of valve materials due to chemical reactions with fluids.  Blockage: Obstruction of flow due to debris or contaminants.  Cavitation: Formation of vapor bubbles and subsequent collapse, causing damage.  Control Issues: Inaccurate or inconsistent control of flow or pressure.  Sticking or Binding: Valve components getting stuck in position.  Seat Damage: Damage to the sealing surface, causing leaks. 11. Explain the use of valve wrenches. Valve wrenches, also known as valve handwheels, are tools used for the manual operation of valves, particularly those that require rotation or linear movement to open or close.

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