Pump + Valve Selection Guide
Pump and valve selection begins with the fluid and the operating conditions of the system. Media composition, viscosity, required flow, pressure, temperature, materials, seals, connection geometry, pressure drop, control function, actuation, maintenance, and piping conditions should be defined before selecting equipment.
Define the Fluid-System Requirement
The same nominal pump or valve size can behave very differently depending on the fluid, pressure, flow, piping, temperature, control method, and internal materials.
Process Media
Identify the liquid, gas, mixture, slurry, chemical, oil, water, air, or other process fluid and any contaminants or suspended solids.
Flow Rate
Define minimum, normal, maximum, startup, bypass, and process flow requirements along with acceptable variation.
Pressure
Record suction pressure, discharge pressure, system pressure, pressure differential, transient conditions, and maximum allowable operating pressure.
Temperature
Determine fluid and ambient temperature ranges because temperature can affect viscosity, seals, materials, pressure capability, and lubrication.
Materials + Seals
Identify body, wetted-part, seat, diaphragm, gasket, and seal materials compatible with the fluid and environment.
Control Function
Determine whether the system requires simple isolation, throttling, metering, pressure regulation, check function, diversion, or automated actuation.
The fluid defines the equipment environment.
Fluid properties affect pressure loss, pump behavior, valve sizing, materials, seals, wear, temperature, and maintenance.
Do not select equipment using water-like assumptions when the actual process fluid behaves differently.
Match Equipment to the Required Function
Pumps create or maintain fluid movement, while valves control how that fluid moves through the system. The required function should be clear before equipment type is selected.
Create Flow
Pumps provide energy to move fluid through piping, equipment, elevation changes, restrictions, and process components.
Isolate
Isolation valves open or close a flow path for operation, maintenance, process separation, or equipment protection.
Regulate + Throttle
Control valves modify flow or pressure by changing the available flow area or responding to process conditions.
Direct + Prevent Flow
Directional and check functions can route fluid, prevent reverse flow, select process paths, or protect equipment.
Check Every Wetted Material
Compatibility is determined by more than the pump casing or valve body. Seals, seats, diaphragms, impellers, trim, gaskets, coatings, and other internal components also contact the fluid.
Four-Step Pump + Valve Selection Process
Define the process first, then compare equipment against the actual fluid and system operating conditions.
Define the Fluid
Record fluid type, viscosity, density, temperature, corrosiveness, solids, cleanliness, vapor behavior, and process requirements.
Define Flow + Pressure
Determine required flow, suction conditions, discharge pressure, differential pressure, line losses, pressure drop, operating range, and transients.
Select Materials + Interface
Choose suitable body materials, wetted components, seals, seats, port size, connection type, orientation, and mounting configuration.
Verify Control + Installation
Confirm actuation, control signals, piping, power, accessibility, drainage, priming, maintenance, and compatibility with surrounding equipment.
Piping + Control Installation Checks
Pump and valve performance is strongly affected by the surrounding piping, available suction conditions, orientation, control devices, and maintenance access.
- Confirm port or flange size, connection type, pressure class, and orientation.
- Verify piping does not place excessive mechanical load on equipment connections.
- Check pump suction conditions and required inlet piping arrangement.
- Confirm flow direction for directional valves and process equipment.
- Provide access for seals, packing, actuators, strainers, and service parts.
- Account for drainage, venting, flushing, priming, and isolation requirements.
- Confirm manual, pneumatic, hydraulic, electric, or solenoid actuation requirements.
- Verify supply pressure or electrical power for the actuator.
- Check fail position, spring return, and loss-of-power behavior where relevant.
- Confirm control signal, switching method, feedback, or position indication.
- Verify cycle rate, response time, modulation requirements, and actuator sizing.
- Confirm compatibility with process controls, interlocks, and safety functions.
Common Pump + Valve Selection Mistakes
Fluid equipment can share the same nominal connection size while having very different operating characteristics, materials, pressure limits, and control behavior.
Selecting by Pipe Size Alone
Matching the connection size does not guarantee suitable flow capacity, pressure drop, pump performance, or valve control behavior.
Ignoring Fluid Properties
Viscosity, corrosiveness, solids, temperature, and other properties can change equipment performance and material suitability.
Checking Body Material Only
Internal seals, seats, diaphragms, gaskets, trim, and other wetted materials must also be compatible.
Ignoring Pressure Differential
System pressure and pressure difference across equipment can affect flow, actuation force, pump operating point, cavitation, and shutoff performance.
Overlooking Actuation
A valve can be mechanically suitable but incompatible with available air pressure, electrical power, control signal, cycle rate, or fail-position requirements.
Selecting Equipment in Isolation
Piping layout, restrictions, suction conditions, elevation, upstream and downstream equipment, and control strategy influence actual system performance.
Related Pump + Valve Resources
Use these references for additional information on industrial pumps, valves, flow measurement, pressure control, and fluid-system compatibility.
Industrial pump references covering multiple fluid movement technologies.
References for isolation, directional, automated, and process-control valves.
Related flow and pressure components used to monitor and control industrial fluid systems.