Aux 1 Unit 3 Q7

Correct Answer: B) Rubber or elastomers

Explanation: The diaphragm is typically made from rubber or elastomers because these materials offer flexibility and excellent chemical resistance, which are crucial for maintaining a reliable seal and preventing degradation in aggressive fluid environments.

Correct Answer: A) It provides precise flow control with minimal maintenance

Explanation: Flexible diaphragm valves offer precise flow control while requiring minimal maintenance because the diaphragm effectively isolates the fluid from the mechanical components, reducing wear and tear.

Correct Answer: C) A torque wrench

Explanation: A torque wrench is used to tighten the bolts securing the diaphragm to ensure they are evenly tightened to the manufacturer’s specifications, preventing leaks and ensuring the diaphragm is properly seated.

Correct Answer: B) Release any pressure in the valve and fluid system

Explanation: The first step is to ensure that any pressure in the valve and the fluid system is safely released. This is critical to prevent injury and to make the valve safe to disassemble.

Correct Answer: B) The diaphragm isolates the fluid from the valve’s internal moving parts

Explanation: The diaphragm in the valve provides a barrier between the fluid and the valve's internal moving parts, preventing corrosion and wear, making it suitable for handling corrosive or abrasive fluids.

Correct Answer: B) The actuator or handwheel

Explanation: The actuator or handwheel is used to move the diaphragm up or down. When the actuator is operated, it either lifts the diaphragm away from the valve seat to allow flow or presses it against the seat to stop the flow.

Correct Answer: B) To regulate or shut off the flow of fluids, especially in corrosive or slurry applications

Explanation: A flexible diaphragm valve is designed to regulate or shut off the flow of fluids, particularly in applications where the fluid is corrosive, abrasive, or contains particulates. The diaphragm provides a tight seal and isolates the fluid from the valve's moving parts.

Correct Answer: B) Make sure the new diaphragm is made of the same material as the original and is free from defects

Explanation: It is essential to use a diaphragm made of the same material as the original to ensure compatibility with the fluid and operating conditions. The diaphragm should also be inspected for defects to avoid premature failure.

Correct Answer: B) Re-pressurize the system to check for leaks and proper operation

Explanation: After replacing the diaphragm, it is essential to re-pressurize the system and check for leaks and proper operation to ensure the valve is functioning correctly and safely before it is put back into service.

Correct Answer: A) To avoid over-compressing the diaphragm, which could cause it to crack or deform

Explanation: Following the manufacturer’s torque specifications is crucial to avoid over-compressing the diaphragm, which can lead to cracking, deformation, or premature failure, compromising the valve's effectiveness.