WBPSC AE (PWD) 1998
⭕ A. Reflux valve
⭕ B. Scour valve
⭕ C. Gate valve
⭕ D. Air-relief valve
📚 Explanation:
The valve used to regulate flow in the outflow pipe of an overhead reservoir is a Gate Valve.
🔹 A parallel gate valve has a flat disc gate between two parallel seats (upstream and downstream).
🔹 It is suitable for low pressure drops and low-pressure conditions where tight shutoff is not critical.
🔹 It allows controlled regulation of water flow without causing excessive turbulence or head loss.
The valve used to regulate flow in the outflow pipe of an overhead reservoir is a Gate Valve.
🔹 A parallel gate valve has a flat disc gate between two parallel seats (upstream and downstream).
🔹 It is suitable for low pressure drops and low-pressure conditions where tight shutoff is not critical.
🔹 It allows controlled regulation of water flow without causing excessive turbulence or head loss.
👉 Therefore, the correct answer is: C. Gate valve
Key Points on Gate Valves:
- Function: Regulates water flow in pipelines.
- Design: Parallel disc gate moves between two seats for low-pressure regulation.
- Use: Suitable where tight shutoff is not critical and low pressure drops are expected.
