Valves for liquids

The following equation can be used for sizing relief valves for liquid expansion. 

The chart given in Figure 16 can be used in the following manner in order to size a relief valve for liquid service. First, determine the area required, A, without any viscosity correction (i.e., for K = 1). Then select the next larger standard orifice size from manufacturer s literature. Determine the Reynolds number, based on the following definition ... 

Sizing Valve for Liquid Expansion (Hydraulic Expansion of Liquid Filled Systems/Equipmenl/Piping)... 

The safety relief valve is used for liquid and gas service. Safety relief valves function as relief valves for liquids and as safety valves for gases. 

A Corrosion-Resistant High-Vacuum Valve for Liquids, R.H. Biddulph and P.H. Plesch, Chemistry and Industry, 1956, 569. 

To size control valves for liquids, use a similar procedure and the relation C = V (G/Ap), where V is flow rate through the valve, in gal/min, Ap is pressure drop across the valve at maximum flow rate, in lb/in2, and G is specific gravity of the liquid. When a liquid has a specific gravity of 100 SSU or less, the effect of viscosity on the control action is negligible. 

The equation for sizing valve for liquid service is given by... 

Sizing a control valve for liquid-gas mixtures introduces incorrect valve coefficient, C, if for each of the two fractions is calculated separately, and then added. This method assumes that the liquid and gas are passing through the valve orifice independently and at greater different velocities. 

THIS PROGRAM SIZES THE RELIEF VALVE FOR LIQUID CONDITION. 

The most widely used control valves for liquid and high pressure gas streams are the various sliding stem valves such as the bevel plug, V-port, parabolic plug, and for small flows the needle valve. For corrosive materials and slurries, pinch-type valves like the Saunders patent valves are used. Rotary stem valves include plug types and for gas flows butterfly valves, dampers, and louvers. 

F, = Valve for liquid samples, = Valve for vapour samples, = Drain valve, Vf — F., = Valves for admitting air, B — Evaporator, D = Perforated copper tube, T — Thermo-wells, C = Condenser, P = Manometer, N = Safety valve... 

Simpson et al. studied the pressure losses through 25mm gate valve for liquid-vapor Freon 113 [53]. They correlated their single-phase valve pressure loss data as... 

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