Question

Which of the following are NOT CORRECT during the operating cycle of a ‘sucker rod pump’?

• A. Standing valve is open during the upward stroke.
• B. Standing valve is closed during the upward stroke.
• C. Travelling valve is closed during the upward stroke.
• D. Travelling valve is open during the upward stroke.

Hint:

Remember: During the upward stroke, the standing valve opens and the travelling valve stays closed.

Answer 1

The Correct Option is B, D

A sucker rod pump works by alternating upward and downward strokes, with two valves (standing and travelling) controlling fluid movement.
Step 1: Upward stroke behaviour.
- The standing valve opens to allow fluid to enter the pump barrel.
- The travelling valve closes to lift the fluid column upward.
Step 2: Evaluate each statement.
(A) Standing valve is open during upward stroke → TRUE
(B) Standing valve is closed during upward stroke → FALSE
(C) Travelling valve is closed during upward stroke → TRUE
(D) Travelling valve is open during upward stroke → FALSE
Step 3: Conclusion.
Statements NOT correct are (B) and (D).