What is the K value for a ball valve?
3-K (Darby) Method
| Valves | K1 | K∞ |
|---|---|---|
| Ball Valve, β = 1 | 300 | 0.017 |
| Butterfly Valve | 1000 | 0.690 |
| Swing Check Valve | 1500 | 0.460 |
| Lift Check Valve | 2000 | 2.850 |
What is the K factor of a valve?
Pipe fittings, valves and bends usually have some associated K factor or local loss coefficient, which allows the calculation of the pressure loss through the fitting for a particular fluid flowing at a specified velocity. Manufacturers of pipe work fittings and valves often publish a fitting’s associated ‘K’ factor.
What is the correct value for K for pipe bend?
An additional loss of head takes place in the course of flow through pipe fittings like valves, couplings and so on. In-general, more restricted the passage is, greater is the loss of head….
| Type and position of fittings | Values of K |
|---|---|
| 90°elbow(threaded) | 0.9 |
| 45°elbow(threaded) | 0.4 |
| Side outlet of T junction | 1.8 |
What is K in head loss?
The resistance coefficient K can be thought of as the number of velocity head loss caused by a valve or fitting. The value of K is constant when the flow is in the zone of complete turbulence.
What is K in fluid dynamics?
The K-value represents the multiple of velocity heads that will be lost by fluid passing through the fitting. It is more accurate than the Equivalent Length method, as it can be characterised against varying flow conditions (i.e. Reynold Number).
What are K values?
K-value is simply shorthand for thermal conductivity. Thermal conductivity, n: the time rate of steady state heat flow through a unit area of a homogeneous material induced by a unit temperature gradient in a direction perpendicular to that unit area.
How do you calculate K factor?
K factor is a ratio between the distance from the neutral bend line to the inside bend radius and the material thickness. K factor uses the formula K factor = δ/T. Y factor uses the formula Y factor = K factor * (Π/2). The default value for Y factor is 0.50.
What is K in pipe flow?
The K-value, Resistance Coefficient, Velocity Head, Excess Head or Crane method allows the user to characterise the pressure loss through fittings in a a pipe. The K-value represents the multiple of velocity heads that will be lost by fluid passing through the fitting.
Why are the K values for the various fittings different?
K factor or K value for different piping fittings accounts for the additional frictional losses contributed by these fittings and valves. K value is then used to calculate the ‘equivalent length’ of fittings.
What is K value in engineering?
It represents the steady-state heat flow through a unit area of a material resulting from a temperature gradient perpendicular to that unit area. It is expressed in W/mK. k-values can be used to compare the thermal conductivities of different materials.
What is K value in distillation?
Ki is called the vapor–liquid equilibrium ratio, or simply the K-value, and represents the ratio of the mole fraction in the vapor, yi, to the mole fraction in the liquid, xi. Equation (2) is also called “Henry’s law” and K is referred to as Henry’s constant.
What is the K factor of a pipe fitting?
A fitting’s K factor allows the pressure drop across the fitting to be calculated for a specific velocity of fluid flow through the pipe fitting. i.e the pressure drop through the fitting varies depending on the fluid velocity and use of an associated K factor allows the fitting pressure loss to be calculated for a particular flow rate.
What are the parts of a K ball valve?
Our ball valve is a stalwart barrier against fugitive emissions. K-BALLBALL VALVES FOR INDUSTRIAL AND PROCESS APPLICATIONS PARTS LIST No. Parts name 1 Handle 2 Spring 3 Locking trigger POSILOCK HANDLE Spring compressed Pull the locking trigger up Release the trigger.
What is the k-value method for pipe fittings?
Fittings such as elbows, tees, valves and reducers represent a significant component of the pressure loss in most pipe systems. This article details the calculation of pressure losses through pipe fittings and some minor equipment using the K-value method, also known as the Resistance Coefficient, Velocity Head, Excess Head or Crane method.
What is the k value of a swing check valve?
My newer Crane TP 410 (1978) lists K = 100 * ft for a swing check with ft = turbulent friction factor for 2 inch pipe = 0.019 so K = 1.9. For 50 gpm, L/D = K/f = 1.9/0.023 = 83 diameters. It omits the in-line ball check valve. gibsi1, IMO, k = 6.1 seems a little high for a ball check.