Valves, Fittings, and Supports Flashcards
6 cards from real PIPEFITTER practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Valves, Fittings, and Supports flashcards as text
What is the primary difference between a 'full port' and a 'reduced port' ball valve?
Answer: A full port valve has a bore equal to the pipe ID; a reduced port has a smaller bore that restricts flow
A full port (full bore) ball valve has an internal bore equal to the pipe ID, providing no restriction. A reduced port has a smaller bore that increases velocity and pressure drop.
What is a 'check valve,' and what is its function in a piping system?
Answer: A self-actuating valve that allows flow in one direction only and prevents backflow
A check valve permits flow in one direction and automatically closes to prevent reverse flow (backflow) when flow stops or reverses.
What is the function of a 'pressure relief valve' (PRV) in a piping system?
Answer: To automatically open and release excess pressure when system pressure exceeds the valve's set point, protecting the system from over-pressure
A PRV (safety relief valve) opens automatically when pressure reaches its set point to release fluid and prevent over-pressure failure of the piping or vessel.
What is a 'spring hanger' used for in process piping systems?
Answer: To support pipe weight while allowing controlled vertical movement due to thermal expansion or settling
Spring hangers support the pipe weight while permitting controlled vertical movement from thermal expansion, preventing stress transfer to nozzles or equipment.
What is the purpose of the 'body-to-bonnet' joint on a gate valve, and how is it typically sealed?
Answer: It seals the pressure boundary where the bonnet (containing the stem and packing) joins the valve body, typically with a gasket and bolted connection
The body-to-bonnet joint is a pressure boundary joint sealed with a gasket (spiral wound or ring joint) and secured with studs/nuts to contain process fluid.
What is a 'pipe shoe' and when is it used instead of a standard pipe clamp?
Answer: A shoe is a cradle welded to the pipe bottom that sits on a structural support, used for insulated pipe to maintain insulation integrity
A pipe shoe is a steel cradle welded to the pipe and resting on a structural support, used on insulated pipe to transfer load without compressing or damaging the insulation.