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North American valve manufacturers will work closely with you to define your valve needs
and specify the product to meet those needs. Use the list below as a guide to some of the many factors you'll need to
consider in making an important valve purchase. Knowing this criteria will help the valve manufacturer or its distributor
design and/or select the best valve for your particular application.
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- Media being handled, e.g., liquid, gas, slurry, or solid
- Corrosiveness of media, e.g., pH, concentration
- Corrosiveness of atmosphere
- Flow (velocity, capacity, Cv, direction)
- Pipe size
- Media temperature (maximum to minimum)
- Pressure: maximum operating pressure; maximum differential pressure
- Operation: e.g., manual/automatic, on-off throttling
- Installation constraints
- Envelope dimensions
- Weight
- Accessibility
- Conformance to appropriate standards, e.g., API, AWWA, ANSI, FM, UL, OSHA, etc.
- Tightness of shutoff required
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- Type, e.g., manual, electric, pneumatic, hydraulic
- Motion required
- Rotary, e.g., quarter-turn, multi-turn
- Linear
- Mode of operation
- Double acting
- Spring return: spring-to-closed, spring-to-open
- Required valve operating thruster torque
- Power supply, e.g., voltage, available air supply
- On/off, throttling, or proportional control
- Corrosive resistance: materials, coating, tubing
- Speed of operation
- Frequency of operation
- Special requirements, e.g., togging, testing
- Accessories, e.g., limit switches, positioner, solenoid valve, transducers, manual override
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- Type of valve, e.g., ball, butterfly, gate, check, control, globe, plug, relief, regulator, pinch,
diaphragm, etc.
- Valve size
- End connections, e.g., screwed, ranged/lugged, wafer, butt-weld, mechanical joint, etc.
- Materials of construction, e.g., carbon steel, resins, steel or other alloys, cast iron, etc.
- Body
- Trim
- Seats
- Bolting
- Frequency of operation
- Packing
- Special requirements, e.g., testing, tagging, coating
- Accessories, e.g., stem/shaft extensions, locking device, position indicator, jacketing
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- Testing
- Source inspection
- Availability of replacement valves, actuators, or parts
- Documentation, e.g., certified prints, dimension drawings
- Installation and maintenance instructions
- Delivery requirements, e.g., timing, packaging
- Availability of engineering service, e.g., application, field, factory
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Valve Specifying Checklist
