What is the name of the valve that reduces the differential pressure across a closed disk, making the main valve easier to open and close?

What is the name of the valve that reduces the differential pressure across a closed disk, making the main valve easier to open and close?

• A. Bypass Valve
• B. Check Valve
• C. Globe Valve
• D. Ball Valve

Answer: (A)

The main idea is to ease moving the main valve by balancing the pressure on its disk. A bypass valve provides a parallel path around the main valve, so when it’s opened, flow can bypass the closed disk and the pressures on either side become more equal. That reduces the differential pressure across the main valve’s disk, lowering the force needed to open or close it and making operation smoother, especially during start-up or maintenance. The other valve types have different purposes: a check valve blocks backflow, a globe valve is a throttling valve with a movable disk, and a ball valve uses a rotating ball to block flow; none specifically reduce the differential pressure across another valve to aid operation.

The main idea is to ease moving the main valve by balancing the pressure on its disk. A bypass valve provides a parallel path around the main valve, so when it’s opened, flow can bypass the closed disk and the pressures on either side become more equal. That reduces the differential pressure across the main valve’s disk, lowering the force needed to open or close it and making operation smoother, especially during start-up or maintenance. The other valve types have different purposes: a check valve blocks backflow, a globe valve is a throttling valve with a movable disk, and a ball valve uses a rotating ball to block flow; none specifically reduce the differential pressure across another valve to aid operation.