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USER MANUAL
Table 2-1: Operating conditions for the control valve (continued)
Condition type Description
Valve capacity C
v
is a capacity coefficient that defines as the number of US gpm of
water that flows through a valve with a pressure drop of 1 psi across
the valve. Daniel valves have the following C
v
:
• NPS 2: 86 gpm
• NPS 3: 186 gpm
• NPS 4: 309 gpm
• NPS 6: 688 gpm
• NPS 8: 1296 gpm
• NPS 10: 2040 gpm
• NPS 12: 2920 gpm
• NPS 16: 5360 gpm
*C
v
based on wide open valve with water temperature at 60° F (16° C)
2.1.1 Design considerations
Some conditions to consider:
• Service operating pressure
• Service testing pressures
• Service process temperature and ambient site temperatures
• Chemical composition and toxicity of fluid in operating conditions
• Traffic, wind and earthquake at loading site
• Adverse force or stress caused by inadequate supports, attachments, piping, etc.
• Corrosion, erosion, fatigue, etc.
• Decomposition of unstable fluids in operating and test conditions
• Possible damage from external fire
• Mass fluid in process and test conditions
WARNING
FUNCTIONAL AND ENVIRONMENTAL HAZARD
Evaluate the functional and environmental conditions prior to installing a control valve.
Install the control valve in a well-designed piping system.
Failure to comply may result in death or serious injury from pipe failure.
User manual Operating conditions and specifications
P/N 3-9008-553 November 2020
User manual 21
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