Ball Valve K Value

Angle valve 45 β 1. Of water at 60 f with a pressure drop of 1 psi. Friction losses in pipe fittings resistance coefficient k use in formula hf kv 2g fitting ld nominal pipe size 1 1 1 2 2 3 4 6 8 10 12 16 18 24 k value angle valve 55 1 48 1 38 1 27 1 21 1 16 1 05 0 99 0 94 0 83 0 77 0 72 0 66.

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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.

Ball valve k value. The head loss due to resistance in valves and fittings are always associated with the diameter on which velocity occurs. A conventional ball valve is normally not used as a throttling valve since a partial flow will create high velocity flow tear at the ball and the seal. Plug valve straight through. Iso 5211 top mounting plate available for easy actuation on selected models.

Go right in table close to the actual water flow. Flow coefficient k v volumetric flow rate of water at a. 3 4 5 way multi port designs available. Select the appropriate k value for such and select d and f for schedule 40 pipe.

The resistance coefficient k is considered to be constant for any defined valves or fittings in all flow conditions as the head loss due to friction is minor compared to the head loss due to change in direction of flow obstructions and sudden or gradual changes in cross. Plug valve branch flow. Flow coefficient information scope the values given below are applicable to floating ball valve tru nnion mounted ball valve when the ball valve is in full open condition. The tables below list the full cv vs angle closure and opening curves for various.

The full closure curve of a ball valve is then the above graph multiplied by the valve s flow coefficient or factor. Go to the left column and select the pressure drop for the valve. The table below can be used to estimate the k v values for process control valves used in water systems. Ball valve flow coefficients c v flow coefficients c v for typical ball valves reduced and full bore.

Cv vs angle closure curve values table. Fittings such as elbows tees valves and reducers represent a significant component of the pressure loss in most pipe systems. Flow coefficient c v it is the full capacity flow rate through the valve in us gallons min. This graph shows the cv or kv valve fraction vs opening and closing angle of a full bore ball valve.

The range includes one two and three piece ball valve designs with screwed weld or flanged end connections. Angle valve 90 β 1.