Series 91000
••• Self-Operating Regulators
Operation, Installation & Maintenance Manual
Page 4
MAXIMUM PSI DROP THRU VALVE
Models 91000 & 91400
Valve
Single Seated
Double Seated
3-Way Sleeve Type
Safety Type
1
/
2
”
250
_
250
100
3
/
4
”
140
250
250
250
1”
80
250
250
250
1
1
/
4
”
50
250
250
175
1
1
/
2
”
35
250
250
150
2”
20
250
250
100
2
1
/
2
”
_
65
125
_
3”
_
50
125
_
4”
_
40
125
_
5”
_
30
_
_
6”
_
25
_
_
Maximum Valve Body (Process Fluid) Temperatures
Two-way plug type valves
1
/
2
” through 2” are rated for 410°F.
Two-way plug type valves 2
1
/
2
” through 6” bodies are rated to 350°F.
Three-way sleeve type valves (all sizes) are rated to 300°F.
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.
Stainless Steel Thermowells are rated to 1000 PSIG.
Model 91600
PRESSURE AND TEMPERATURE LIMITS
Maximum Static Pressure
Valve bodies in 1/2” through 2” sizes are rated for 250 PSIG max.
Valve bodies in 21/2” through 6” sizes are rated for 125 PSIG 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.
