What is a instrumentation and control technician?

Instrumentation and control technicians work with a wide variety of pneumatic, electronic and microcomputer devices used to measure and control pressure, flow, temperature, level, motion, force, and chemical composition.

What is CV instrumentation?

Cv = The flow coefficient of the control valve. ΔP = is the pressure drop across the control valve. SG = Specific gravity of fluid referenced to water at 60 degree Fahrenheit. Q = Flow in US gallons per minute.

What is CV in valve sizing?

CV: The Flow Coefficient, CV, is a dimensionless value that relates to a valve’s flow capacity. Its most basic form is Q=Flow rate and ∆P=pressure drop across the valve. A sizing application will have a Required CV while a valve will have a Rated CV. The valve’s rated CV must equal or exceed the required CV.

How do you convert KV to CV?

Control Valve Relation between Cv and Kv

The Valve Coefficient (Cv – in Imperial unit) – the number of US GALLON PER MINUTE of water at 60 °F that will flow through a valve at specific opening with a pressure drop of 1 psi across the valve.
The flow factor (Kv – in Metric unit) – the amount of water that will flow in m3/hr.
Cv = 1.156 * Kv.
Kv = 0.864 * Cv.

How do you calculate valve CV?

Cv by definition is the number of gallons per minute (GPM) a valve will flow with a 1 psi pressure drop across the valve. For example a valve with a Cv of 10 will flow 10 GPM with a 1 psi pressure drop. The formula used to select the valve Cv with the specified differential pressure is: Cv=GPM/((SQ RT(∆P)).

How do you calculate kv?

Flow Calculation – (Kv)

Kv = m3/h – Flow coefficient.
Q = m3/h – Flow.
Qn = m3n/h – Normal flow (20°C 760mm Hg)
P1 = bar – Inlet pressure – (Gauge pressure + 1)
P2 = bar – Outlet pressure – (Gauge pressure – 1)
DP = bar – Pressure drop – (Differential pressure between inlet and outlet pressure)

What is KV and CV?

Kv is the flow coefficient in metric units. Cv is the flow coefficient in imperial units. It is defined as the flow rate in US Gallons per minute [gpm] of water at a temperature of 60º fahrenheit with a pressure drop across the valve of 1 psi.

What is CV in control valve?

Valve Flow Coefficient (Cv) is a valve’s capacity for a liquid or gas to flow through it. It is technically defined as “the volume of water at 60°F (in US gallons) that will flow through a valve per minute with a pressure drop of 1 psi across the valve.”

What is the difference between KV and KVS?

Kv and KVS provide information about the flow that will pass through a valve: KV is the flow that generates a pressure drop of 1 bar at a given degree of openness . KVS is the flow that generates a pressure drop of 1 bar when the valve opening is maximum.

What is the unit of CV?

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.

What is CV value?

The valve coefficient, Cv, is a number which represents the capability of a valve (or any flow component) to flow a fluid. 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.

How do you calculate flow rate on CV?

Control Valve Sizing

Control Valve Sizing.
When sizing a control valve, the most common approach is to calculate the flow coefficient, Cv which is a measure of the capacity of the valve body and trim.
C = Q/N1 * √ (ρ1/ρ0) / (∆P)
ρ1/ρ0 is the relative density.
Fluid Density: 965.4 kg/m3.
Flow Rate (Q): 360 m3/h.
C = Q/N1 * √ (ρ1/ρ0) / (∆P)

What is CV rating?

The Cv rating for each valve is listed in the tables found in the valve catalog. The definition of Cv is the # of gallons of water that will flow through the valve with a 1 PSI pressure differential when the valve is open.

What is CV Hydronics?

“CV” is a term constantly used in selecting valves. The CV factor is a standard used by all valve manufacturers. CV stands for the “coefficient of flow” of a valve, and is further defined as the flow rate in gallons of 60°F water that will pass through a valve in one minute at one-pound pressure drop.

What is CV in air flow?

Cv — the coefficient of flow — is one standard for expressing the flow capacity of devices used in a pneumatic system. Many manufacturers around the world have adopted Cv as the standard value to express the flow capacity of their components.

What is difference between SCFM and CFM?

The full form of CFM is Cubic Feet per Minute whereas the full form of SCFM is Standard Cubic Feet per Minute. CFM is always a smaller number than SCFM as it is calculated at higher pressure than the SCFM which makes the air volume smaller.

What is C SUBV?

ΔP is the pressure drop across the valve (expressed in psi). In more practical terms, the flow coefficient Cv is the volume (in US gallons) of water at 60 °F that will flow per minute through a valve with a pressure drop of 1 psi across the valve.

How do you calculate CV for gas?

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.

How do you calculate CP and CV?

The specific heat of gas at constant volume in terms of degree of freedom ‘f’ is given as: Cv = (f/2) R. So, we can also say that, Cp/Cv = (1 + 2/f), where f is degree of freedom. Monoatomic gas has only one translational motion, hence three translational degrees of freedom.

What is CV calculation?

In statistics, CV or coefficient of variation is a measure of the variability of a sample dataset expressed as a percentage of the mean. It is calculated as the ratio of the standard deviation of the sample to the mean of the sample, expressed as a percentage.

What is CV for a monatomic gas?

The molar specific heat capacity of a gas at constant volume Cv is the amount of heat required to raise the temperature of 1 mol of the gas by 1◦C at the constant volume. Its value for monatomic ideal gas is 3R/2 and the value for diatomic ideal gas is 5R/2.

What is the value of CV for air?

The nominal values used for air at 300 K are CP = 1.00 kJ/kg. K, Cv = 0.718 kJ/kg.

What is the ratio of CP CV?

The Cp/Cv ratio is also called the heat capacity ratio. In thermodynamics, the heat capacity ratio is known as the adiabatic index. (i.e.) Heat Capacity ratio = Cp/Cv = Heat capacity at constant pressure/ Heat capacity at constant volume.

Which is greater CP or CV?

cp is greater than CV because when gas is heated at constant volume,whole of the heat supplied is used to increase the temperature only. But when gas is heated at constant pressure,the heat supplied is used to increase both temperature and volume of gas.

What is the value of CP minus CV?

The value of Cp−Cv=1. 00R for a gas in state A and Cp−Cv=1.

Can CP be less than CV?

Therefore, it can be said that Cp is greater than Cv. The difference is due to the fact that in the first case, the gas changes its volume (expands)….Thank you.

Related Questions & Answers
Explain The Term Motion	When A Forward Bias Is Applied To A P N Junction It

What is the difference between CP and CV?

CV: CV is the amount of heat energy that a substance absorbs or releases (per unit mass) with the change in temperature where a volume change does not occur. CP: CP is the amount of heat energy that a substance absorbs or release (per unit mass) with the change in temperature where a pressure change does not occur.

What is CP of water?

Specific Heat of Water For liquid at room temperature and pressure, the value of specific heat capacity (Cp) is approximately 4.2 J/g°C. This implies that it takes 4.2 joules of energy to raise 1 gram of water by 1 degree Celsius. This value for Cp is actually quite large.