Installation, Operation and Maintenance Manual
【
H-V063-E-9
】
Self Control Valves (Pressure Reducing Type / Pressure Relief Type / Pressure Retaining Type)
7
7. Valve flow characteristic
- Pressure Reducing Type (V182)
- Pressure Reducing Type (V82)
- The friction coefficient increases with the flow rate and
the outlet pressure decreases.
P
E
： Set pressure (at a flow rate of 0 L/h)
P
E
-P
min
： Max. pressure reduction value
・The set pressure is set at PE. If the flow rate is
increased to Q, the outlet pressure will decrease to P
O
.
P
O
line ： Opening pressure characteristic. (Flow rate
increasing)
Ｐ
Ｓ
line ： Closing pressure characteristic. (Flow rate
decreasing)
Hysteresis ： The flow rate is affected by the influence of
the spring, piston and diaphragm in the valve.
The working pressure is also a function of
these parts, and will change depending on
whether the flow rate is increasing or
decreasing.
