[VALVES]

Purpose:

Defines all control valve links contained in the network.

Format:

One line for each valve containing:

• ID label
• ID of start node
• ID of end node
• Diameter, inches (mm)
• Valve type
• Valve setting
• Minor loss coefficient when fully open
• ID of valve characteristic curve (PCVs only)

Remarks:

1. Valve types and settings include:
   

   Valve Type	Setting
   PRV (pressure reducing valve)	Pressure (pressure units)
   PSV (pressure sustaining valve)	Pressure (pressure units)
   PBV (pressure breaker valve)	Pressure (pressure units)
   FCV (flow control valve)	Flow (flow units)
   TCV (throttle control valve)	Partially open loss coefficient
   PCV (positional control valve)	Percent open
   GPV (general purpose valve)	ID of head loss curve

   
   
2. Shutoff valves and check valves are considered to be part of a pipe, not a separate control valve component (see [PIPES]).
3. The loss coefficient setting for a TCV should not be less than its fully open loss coefficient.
4. The characteristic curve for a PCV relates the valve's percent of fully open flow to the percent open. If not supplied then a linear curve is assumed.
5. The partially opened loss coefficient for a PCV is the inverse of the squared value from its characteristic curve times the fully open loss coefficient.
6. The head loss curve for a GPV relates head loss across the valve to the flow rate through it.