Dwyer 38R - Manual (Page 4)

Series 38R ••• Self-Acting Temperature Control Valves Operation, Installation & Maintenance Manual
Page 4
MAXIMUM PSI DROP THRU VALVE, PSI (bar)
Indicating & Non-Indicating Actuator Options 1 & 2
Valve Single Seated Double Seated 3-Way Fail-Safe
1 / 2 ” 250 (17.3)
_
250 (17.3) 100 (6.9)
3 / 4 ” 140 (9.7) 250 (17.3) 250 (17.3) 250 (17.3)
1” 80 (5.5) 250 (17.3) 250 (17.3) 250 (17.3)
1 1 / 4 ” 50 (3.4) 250 (17.3) 250 (17.3) 175 (12.1)
1 1 / 2 ” 35 (2.4) 250 (17.3) 250 (17.3) 150 (10.3)
2” 20 (20) 250 (17.3) 250 (17.3) 100 (6.9)
2 1 / 2 ”
_
65 (4.5) 125 (8.6)
_
3”
_
50 (3.4) 125 (8.6)
_
4”
_
40 (2.8) 125 (8.6)
_
5”
_
30 (2.1)
_ _
6”
_
25 (1.7)
_ _
Maximum Valve Body (Process Fluid) Temperatures
Two-way plug type valves 1 /
2
” through 2” are rated for 410°F (210˚C).
Two-way plug type valves 2 1 / 2 ” through 6” bodies are rated to 350°(177˚C).
Three-way sleeve type valves (all sizes) are rated to 300° (148˚C).
Pressure Limits for Temperature Sensing Bulbs
The temperature sensing bulbs on a regulator are not recommended for direct insertion into any pressurized
system. The use of a Thermowell is strongly encouraged.
Brass and Steel Thermowells are rated to 500 PSIG (34.5 bar).
Stainless Steel Thermowells are rated to 1000 PSIG (68.9 bar).
Actuator Options 3
PRESSURE AND TEMPERATURE LIMITS
Maximum Static Pressure
Valve bodies in 1/2” through 2” sizes are rated for 250 PSIG (17.2 bar) max.
Valve bodies in 2
1 / 2 ” through 6” sizes are rated for 125 PSIG (8.6 bar) max.
Maximum Pressure Drop through the Valve
The “Pressure Drop” is the change in pressure of the process fluid as it passes through the valve.
A self-operating temperature regulator is often used on installations that at times will require a full shut
off, causing the pressure drop to equal the total inlet pressure. Therefore the inlet pressure should not
exceed the maximum pressure drops as listed in the following table.