When Used With Regulator; When Used With Pneumatic Control Valve - Patterson-Kelley P-K COMPACT Operating And Maintenance Instructions Manual

S E
PENCE NGINEERING
5
4"
1
/ " NPT
8
5
3 / "
8
TYPE T61, T62 & T63 PILOT

When used with Regulator

The regulator is operated by it's initial steam pressure. It is
normally closed, being held so by initial pressure on the disc and
by an internal main spring. The pressure pilot is actuated by
means of an air signal applied to it's diaphragm. This signal is
received from the temperature pilot as a result of the temperature
bulb sensing a drop in temperature from the control setting.
When steam is turned on, it flows through the pressure pilot (Fig.
2) to the No 8B tee. Bleedport No. 4A restricts the flow, builds
pressure under the diaphragm and opens the main valve.
Restriction No. 5A steadies the operation of the regulator.
Steam flowing to the heater develops a rising delivery pressure
which feeds back through the control pipe to the pressure pilot
diaphragm. As this pressure approached a balance with the air
Technical Data
C
OMPANY,
5
/ "
8
1
/ " NPT
2
12"
OPERATING PRINCIPLE
I
NC.
150 COLDENHAM ROAD, WALDEN, NY 12586-2035
Air Master TYPE T61, T62 & T63
PNEUMATIC TEMPERATURE
CONTROLLER
The T61 Series Temperature Regulator is ideal for wide ranging,
fast changing loads on instantaneous heaters and other difficult
process applications. The cascade principle, normally used only
on instrument type regulators, is the basis for this inexpensive
design. The T61, when used with a properly selected A Series
Pilot or Control Valve, continuously adjusts a pressure regulator
to the required heater pressure. This action, coupled with the fast
response of a bimetallic thermostat, gives exceptional results.
Added convenience and economy results from the wide (200°F)
adjustable range and the low air consumption (.35 cfm). These
controllers have adjustable proportional band as well as
overtemperature protection.
SPECIFICATIONS
Max. Air Supply Pressure ..................32 psi
Max. Signal Pressure ........................2 psi below Supply
Mounting .......................................1/2" NPT
Air Connections ..............................1/8" NPT
Air Consumption, Maximum ...............0.70 SCFM
Air Consumption, Normal ..................0.35 SCFM
Proportional Band (Adjustable) ............1/4 to 2 psi per 1°F
Weight ..........................................2 3/4 lb.
TEMPERATURE RANGES
T61 & T62 50° to 250°F
T63 150° to 300°F
pressure signal supplied by the temperature pilot , the pressure
pilot throttles. This, in turn, allows the main valve to assume a
position to maintain the set temperature.
As the temperature at the outlet of the heater increases, it causes
the T61 Pilot to reduce the loading air pressure and this, in turn,
will cause the pressure regulator to modulate the steam flow to
the heater.

When used with Pneumatic Control Valve

The T61 Series Pilot will send a proportional air signal from 0 psi
to a maximum of 30 psi (not greater than 2 psi less than the
supplied pressure) within a ???? degree span. The Pilot will
increase signal as the temperature falls, which will either open or
close the control valve, depending upon actuator configuration.
SD 4522C