# How do you calculate the flow rate of a solenoid valve?

## How do you calculate the flow rate of a solenoid valve?

The amount of flow of a fluid through a (solenoid) valve can easily be calculated with flow coefficient Kv….

1. Q = flow rate of liquid (m3/hour)
2. Kv = flow coefficient (m3/hour)
3. SG = Specific Gravity (=1 for water)
4. dp = pressure differential over the valve (bar)

## What is a good flow rate for a solenoid valve?

between around 10 and 1000 ms
Solenoid valves open and close fast (between around 10 and 1000 ms).

What is Cv in solenoid valve?

The Cv value is the number of U.S. gallons of 60°F water per minute that, when flowing through the valve, causes a pressure drop of 1 psi. This measure of capacity is stated for each model in this handbook.

What is Cv of an orifice?

In the U.S. system of units, the Cv coefficient is the number of U.S. gallons per minute of water that will pass through a given orifice area at a pressure drop of 1 PSI. An orifice or valve passage which has a Cv coefficient of 1.00 will pass 1 GPM of water (specific gravity 1.0) with a pressure drop of 1 PSI.

### How do you calculate flow through a valve?

The volume flow rate for liquids can be calculated by multiplying the fluid velocity times the flow area. Thus, Cv is numerically equal to the number of U.S. gallons of water at 60°F that will flow through the valve in one minute when the pressure differential across the valve is one pound per square inch.

### Do solenoid valves restrict flow?

Solenoid valves use electricity to open and close an orifice in the valve body, allowing or preventing the flow of a given medium. Solenoid valves can also be used to control or actuate other processes.

How do I choose the right solenoid?

To determine the optimal size for your solenoid valve, you need to know the flow rate, which allows you to determine the flow factor (kv). The flow factor is a theoretical value that indicates the volume of water at room temperature that flows through the solenoid valve with a pressure drop of 1 bar for one minute.

What is a good flow coefficient?

We recommend you select a valve for which the Cv falls between 20% and 80% open stem travel. For example, if you used our valve sizing calculator and came up with a Cv value of 14, you would want to choose the 2-inch valve because in the 3-inch valve,14 would fall outside of the recommended range.

#### How is flow coefficient calculated in Cv?

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

#### How do you calculate CV flow?

How do you use Cv value?

By definition, a Cv value of one is the Cv required to flow one gallon per minute (gpm) of water at 60′ F with a pressure differential of one psi. Flow is proportional to the value of Cv. For example, a Cv of 150 would then equate to 150 gpm of water at 60′ F with a differential pressure of one psi.

How do you calculate the Cv value of a valve?

The formula used to select the valve Cv with the specified differential pressure is: Cv=GPM/((SQ RT(∆P)). If the specified ∆P is 4 psid and full flow is 10 GPM the calculated CV is 10/SQ RT of 4 = 5.

## What is the valve flow coefficient of a solenoid valve?

So, through our example, we found that the valve flow coefficient (Cv) is rounded out to equal 30.15, which these 2” brass solenoid valves or 2” stainless steel solenoid valves can handle. As you can probably tell, the calculation itself wasn’t too tricky.

## What is the orifice size of a valve?

The orifice is the diameter (mm) of the hole that will be closed of in the valve, as shown in the sectional drawing below. Often this applies: the larger the piping connections of the valve, the larger is the orifice. The flow resistance of the valve is expressed in the flow coefficient Kv.

What is the flow resistance of a water orifice?

Often this applies: the larger the piping connections of the valve, the larger is the orifice. The flow resistance of the valve is expressed in the flow coefficient Kv. This constant indicates the amount of water in m 3 /hour that passes the valve at a pressure of 1 bar at 20°C.

What is a 3/2 way solenoid valve?

A 3/2 way valve has three ports and two positions. The 3/2-way solenoid valves are usually direct operated and operate from 0 bar. They usually have small orifices, which make them suitable only for small flow rates. If you need a larger orifice, you might consider a 3-way electric ball valve.

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