Piping Valves Q&A

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Gear Operated Gate Valves

What are the applicable standards for using a gear-operated valve instead of a standard handwheel…
2 answers 0 votes 993 views
Posted 1 year agoby Eric Peterson
A

What is the difference between flashing and cavitation in a valve?

Flashing and cavitation phenomenon can occur in piping systems carrying liquids where the flow is…
0 answers -1 votes 683 views
Posted 2 years agoby admin
A

What are bellow sealed valves?

Bellow seal valves are used to eliminate valve emissions or leakage through the stem seals.…
0 answers 1 vote 394 views
Posted 3 years agoby admin
A

Why do some valves require extended bonnet?

Bonnet extensions are required in valves when they handle high or low temperature service which…
0 answers -1 votes 871 views
Posted 3 years agoby admin
A

What is Cv of a valve?

The relationship between pressure drop and flow rate through a valve is conveniently expressed by…
0 answers 0 votes 398 views
Posted 3 years agoby admin
A

What are the limitations of diaphragm valves?

Diaphragm valves can be considered as positive displacement type of valves comprising of a rigid…
0 answers 0 votes 320 views
Posted 3 years agoby admin
A

What are the standards for fugitive emission testing of valves?

Following are the applicable standards for fugitive emission testing of valves: API STD 624 -…
0 answers 0 votes 385 views
Posted 3 years agoby admin
A

What are the applicable standards for globe valves?

API STD 623 - Steel Globe Valves—Flanged and Butt-welding Ends, Bolted Bonnets This standard was…
0 answers 0 votes 401 views
Posted 3 years agoby admin
A

What special precautions have to be taken for installation of butterfly valve?

The chord diameter is an important dimension to be taken care of while installing the…
0 answers 0 votes 501 views
Posted 3 years agoby admin
A

What are non-slam check valves and where are they used?

Traditional swing check valves rely on reversal of flow and gravity to fully close. A…
0 answers 1 vote 414 views
Posted 3 years agoby admin
A

What is meant by retainerless design in check valve?

API 594 refers to Type A check valves which have short face to face dimensions…
0 answers -4 votes 1241 views
Posted 3 years agoby admin
A

Can piston check valves be installed in the vertical?

Piston or ball check valve are generally used in small sizes up to 2 inches.…
0 answers 0 votes 2318 views
Posted 3 years agoby admin
A

What are the advantages of parallel slide gate valves?

Parallel slide gate valves comprise of two discs with spring fitted between the two discs.…
0 answers 0 votes 574 views
Posted 3 years agoby admin
A

What is a dead man's handle for a valve?

A dead man's handle is a spring return handle provided for applications requiring draining or…
0 answers 0 votes 380 views
Posted 3 years agoby admin
A

What are the limitations of soft seated valves with respect to pressure rating?

Valves provided with soft seat may not comply with the pressure rating combination specified in…
0 answers 0 votes 365 views
Posted 3 years agoby admin
A

Why are lubricated plug valve not suitable for throttling?

Lubricated plug valves are sometimes used for throttling though they are not recommended for this…
0 answers 0 votes 363 views
Posted 3 years agoby admin
A

What is the advantage of reduced bore valve over full bore valve?

Reduced bore valves have a smaller ball size than full bore valve and consequently the…
0 answers -5 votes 2075 views
Posted 3 years agoby admin
A

How can trunnion ball valve seat at low differential pressures?

In a trunnion mounted design, the seats are spring loaded on to the ball. This…
0 answers 0 votes 319 views
Posted 3 years agoby admin
A

When is trunnion mounted ball valve used?

In a floating ball valve, the stem is not fixed to the stem. Sealing on…
0 answers 0 votes 316 views
Posted 3 years agoby admin
A

What is the difference between solid wedge type and flexible wedge type gate valve?

The solid wedge type gate valve is the most commonly used type of gate valve.…
1 answer -7 votes 3565 views
Posted 3 years agoby admin

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