Erdmann Corporation 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 needed in making an important valve purchase. Knowing this criteria will help you select the best valve for the particular application.
Application
- 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 (max-min)
- 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, ASTM, ANSI, FM, UL, OSHA, etc.
- Tightness of Shutoff Required
Valve Requirements
- Type of Valve,e.g., ball, butterfly, gate, check, control, globe, plug, relief, regulator, pinch, diaphragm, etc.
- Valve Size
- End Connections,e.g., screwed, flanged/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 (type and material)
- Special Requirements, e.g., stem/shaft extensions, locking device, position indicator, jacketing
Valve Actuation
- Type, e.g. manual, electric, pneumatic, hydraulic
- MotionRequired
- Rotary, e.g., quarter-turn, multi-turn
- Linear
- Mode of Operation
- Double-acting
- Spring return (spring-to-closed, spring-to-open)
- Required Valve Operating Thrust or 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., tagging, testing
- Accessories, e.g., limit switches, positioner, solenoid, valve, transducers, manual override
Service Requirements
- 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