What is the CV factor of a control valve?

What is the CV factor of a control valve?

Valve Flow Coefficient (Cv) is the flow capability of a control valve at fully open conditions relative to the pressure drop across the valve. It is defined as the volume of water (GPM in the US) at 60°F that will flow through a fully open valve with a pressure differential of 1 psi across the valve.

What is the difference between check valve and globe valve?

The main difference lies in the structure of their disc and stem. For globe valve, the stem permanently affixed to the globe disc. While in the stop check valve structure, the stem head floats in the globe disc. When we raise the stem, the internal disc performs as a lift check allowing it to freely move up and down.

What is a Globe check valve?

A globe style silent check valve is a type of valve used for regulating flow in a pipeline, consisting of a movable disk-type element and a stationary ring seat in a generally spherical body.

How do you calculate Cv for valves?

The equation for calculating the valve flow coefficient is Cv = Q √ (SQ/P).

What are the disadvantages of a globe valve?

DISADVANTAGES: Higher pressure drop (compared to a gate valve) Requires greater force or a larger actuator to seat the valve (with pressure under the seat) Throttling flow under the seat and shutoff flow over the seat.

Which is better globe or gate valve?

Gate valves are cheaper than globe valves. Gate valves have little pressure drop across the valve and provide little resistance to the media flow in the open position. Globe valves, on the other hand, provide substantial resistance to the flow of the fluid and have high pressure drops.

What type of globe valves are there?

There are three basic globe valve body designs: Tee, Angle, and Wye.

• Tee. This is the most common body type for a globe valve.
• Angle. The ends of this globe valve are at a 90° angle allowing fluid to flow in a single 90° turn.
• Wye. This type is an alternative for the high pressure drop commonly found in globe valves.

What are the different types of globe valves?

What is an acceptable Cv value?

In general, a coefficient of variation between 20–30 is acceptable, while a COV greater than 30 is unacceptable.

What are advantages of globe valves?

Advantages and Disadvantages of Globe valves

• Good shutoff capability.
• Moderate to good throttling capability.
• Shorter stroke (compared to a gate valve)
• Available in tee, wye, and angle patterns, each offering unique capabilities.
• Easy to machine or resurface the seats.

Can we use gate valve instead of globe valve?

What type of valve is a check valve?

unidirectional valves
Check valves are unidirectional valves that provide unobstructed flow in one direction as long as flow pressure remains constant and protect the piping system against reverse flow. The three main types of check valves we offer are ball, piston, and stop check valves.