Dwyer 38R - Manual (Page 16)

Page 16
Series 38R ••• Self-Acting Temperature Control Valves Operation, Installation & Maintenance Manual
3 WAY-REGULATORS – Installation & Maintenance
The Actuators on these regulators are identical to those previously described and the bulb installation is also
identical. These valves require three piping connections and can be used to diverge the flow to either of two
outlets, or to converge two inlets into one outlet. Port C is normally closed and Port B closes as temperature
increases. Port A is the common port and remains open.
G
LOWER
PORT
(B)
UPPER
PORT
(C)
COMMON
PORT
(A)
F
E
for Mixing or Diverting
MIXING
FLOW DIAGRAM
DIVERTING
FLOW DIAGRAM
TEMPERATURE COLD
MIXING: Inlet pressures must be equal and check valves are recommended in inlets.
DIVERTING: Outlet pressures must be close to equal to provide consistent pressure differential
both ways if partial flows must be maintained.
NOTES: This valve not to be used for Steam or Temperatures over 350˚F.
1 / 2 ” thru 2” sizes have union ends and 2 1 / 2 ” thru 4” sizes have flanged ends.
TEMPERATURE SET-POINT
TEMPERATURE HOT
TEMPERATURE COLD
TEMPERATURE SET-POINT
TEMPERATURE HOT