valve 3

What is he doing?

• disk lapping

• valve lubricating

• packing installing

• pressure testing

What type is this valve?

• needle valve

• pinch valve

• diaphragm valve

• press valve

What type is this valve?

• instrument valve

• plug valve

• needle valve

• pinch valve

Most common material for packing can be:

• metallic

• graphite

• PTFE

• plastic

What is this?

• gland joint

• gland nut

• gland flange

• packing gland

Stuffing box ID is 45 mm. Stem OD is 25 mm. What is the packing size required?

• 15 mm
• 20 mm

• 10 mm
• 7.5 mm

Packing size is 6 mm. Stuffing box depth is 54 mm. How many packing is required?

• 7
• 10
• 12
• 9

3 common types of manual valve pressure testing?

• pressure relief test

• closure test / seat test

• backseat test

• shell test or body test

• flow test

In gate valve, why the disc must sit tightly on seat?

• To prevent leakage
• To make it easier to open and close
• To increase the flow rate
• To reduce the weight of the valve

Valve passing can occur due to:

• disc is not flat

• damaged seat

• disc does not sit properly on the seat

• gasket not properly installed