Pipe fittings valves supports and fasteners

List the four principal functions of valves.

• Starting and stopping flow

• Regulating (throttling) flow

• Preventing reversal of flow

• Regulating or relieving pressure

• Used in replacement of a coupling

Regulating or throttling flow is done with:

• gate valves

• glove valves

• angle valves

• Both B and C

Check valves are used to _____ or _______ reversal flow in piping.

• check

• prevent

• allow

• limit

Name the two basic types of check valves.

• Swing check

• Lift check

• Disc check

• Globe Tech

Most valves are selected on the basis of their ________ in a piping system.

• Budget

• Application

• Tools available

• ease of install

Gate valves should be used as _____ valves either fully open or fully closed.

• flow regulation

• reversal prevention

• pressure regulation

• stop

List four types of disc commonly used in Gate valves.

• Solid wedge disc

• Double disc

• Split wedge disc

• Flexible wedge disc

• plug disc

List the three most common types of gate valve stem designs.

• Rising stem, inside screw.

• Non Rising stem

• Rising stem outside screw and yoke

• All of the above

Tapered plug disc have ______ seating contact than the spherical or full-way type.

• wider

• a narrow

List the three types of discs used in Globe valves

• Conventional with spherical or fullway seats.

• Plug type disc

• Needlepoint disc and seat

• Teflon or composition disc