JetFlow Relay User Instruction
– AIIOM000287
9
4
INSTALLATION – MOUNTING
4.1
Mounting to the Valve Actuator
Assembly
To attach a JetFlow positioner unit to a valve actuator
assembly refer to Figure 4: Mounting to Valve Actuator
Assembly and proceed as outlined below.
1. Align the JetFlow positioner unit with the three holes in
the mounting bracket. Fasten with three M12 screws.
2. Align the bracket with the four holes on the yoke
mounting pads. Secure the bracket with four 1/2" -
13UNC bolts and 1/2" washers.
Figure 4: Mounting to Valve Actuator Assembly
5
INSTALLATION - TUBING
After mounting to the actuator, tube the JetFlow. For best
performance, use 25.4mm (1 inch) to 31.8mm (1.5 inch)
tubing.
5.1
Determine Air Action
When an air supply is present, and the relay is energized,
port A delivers air. Typically, the tubing from port A is
connected to the side of the actuator that results in the air
compressing the actuator spring. When tubed this way, the
actuator and JetFlow spring are designed to return the valve
to the fail-safe state if supply air or power to the unit fails or is
turned off.
Tube port A to the side of the actuator that must receive air to
begin moving away from the fail-safe state.
Verify the positioner DIP switch is correctly set for the air
tubing configuration. Refer to
Logix™ 3800 Digital Positioner
FCD LGENIM0112
or more information about setting the
positioner DIP switches.
Connect port B to the other side of the actuator.
DANGER:
Proper tubing orientation is critical for the
positioner to function correctly and have the correct failure
mode. The backward tubing could cause an unsafe failure
mode.
Example: Tubing Linear Double-Acting Actuators
For a linear air-to-open actuator, the tubing from port A is
connected to the bottom side of the actuator (closest to the
valve). Tube port B of the JetFlow to the top side of the
actuator. See Figure 5: Linear, Double Acting, Air to Open.
For a linear air-to-close actuator the tubing configuration is
reversed.
Figure 5: Linear, Double Acting, Air to Open
5.2
Connect Supply Port
For best performance use a 31.75mm (1.25 inch) to 31.8mm
(1.5 inch) supply line to connect to the supply port.
Install a coalescing filter in the supply air line to maintain the
recommended air quality.
Use a supply regulator to control the supply pressure in
applications where the supply pressure is higher than the
maximum actuator pressure rating. The regulator is required
to lower the pressure to the
actuator’s maximum rating.
DANGER:
Exceeding the maximum actuator supply
pressure may cause the actuator to explode, causing death,
injury, or property damage.
5.3
Venting
NOTE:
A JetFlow relay vents air directly to the
atmosphere through two vent ports.
The vent ports are located on the front of the JetFlow. The
port is tapped with a ¼ NPT thread and shielded with a
protective cover.
Port A
Port B