Engineering Information For PDC Butterfly Valves

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Sizing for:

Sizing for Liquids

 

Where:

Cv = Flow coefficient (number of U.S. gallons of water flowing through a valve with a pressure drop of 1 psig)

G = Specific gravity of flowing media at system temperature. water = 1 @ 60 deg. F.)

DELTA P = Pressure drop, P1 -P2, psig

Cf = Critical flow factor (0.65 @ 60 deg.; 0.55 @ 90 deg.)

P1 = Inlet pressure, psia

P2 Outlet pressure, psia

Q = Flow, gallons per minute, GPM


Sizing for Gases:

Where:

T = Absolute temperature of flowing media, deg. R (deg. F + 460)

q = Flow, standard cubic feet per hour, SCFH


Sizing for Saturated Steam Service:

Where:

W = Flow, lbs./hr.

Add 7% to Cv for each 100° F of super heat.


Sizing for Vapor Flow (Other Than Steam):

Where:

K = Constant for vapor

Vapor
K
Freon 11
7.4
Freon 12
7.1
Freon 14
8.4
Freon 114
8.3
Ammonia
2.7
Dowtherm A
5.6

Other important information