Valves Services

Reference data and engineering information about valves services for fluid mechanics applications.

valvesservices

Overview

Engineering reference data for Valves Services in fluid mechanics.

Key Formulas

Reynolds Number

$Re = \frac{\rho v D}{\mu}$

Ratio of inertial to viscous forces — determines flow regime.

Bernoulli's Equation

$P + \frac{1}{2}\rho v^2 + \rho g h = \text{const}$

Conservation of energy for steady, inviscid, incompressible flow.

Continuity Equation

$A_1 v_1 = A_2 v_2$

Conservation of mass for incompressible flow.

Darcy-Weisbach

$\Delta P = f \frac{L}{D} \frac{\rho v^2}{2}$

Pressure drop due to friction in a pipe.

Variables

Symbol	Description	Unit
$Re$	Reynolds number	—
$\rho$	Fluid density	kg/m³
$v$	Flow velocity	m/s
$D$	Characteristic dimension	m
$\mu$	Dynamic viscosity	Pa·s
$P$	Pressure	Pa
$f$	Darcy friction factor	—

4 rows

Common Valve Types for Different Industrial Services
Service / Medium	Main Valve Types	Secondary / Other Valve Types
Gases	Butterfly, Check, Diaphragm, Lubricated plug, Screw down stop	Pressure control, Pressure relief, Pressure reducing, Safety, Relief
Liquids (clear to sludges/sewage)	Butterfly, Screw down stop, Gate, Lubricated plug, Diaphragm, Pinch
Slurries & liquids with solids	Butterfly, Pinch, Gate, Screw down stop, Lubricated plug
Steam	Butterfly, Gate, Screw down stop, Turbine	Check, Pressure control, Pre superheated, Safety & relief

Source: engineeringtoolbox.com

Valve Service Definitions

Slurry: A thin mixture of a liquid (like water) and finely divided substances, such as cement or clay particles.
Sludge: A semi-solid slurry. Wastewater solids are also referred to as sludge.

References

Original Source

Source: engineeringtoolbox.com