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3 Maintenance
Always use Alfa Laval genuine spare parts.
Place gasket in body groove and clamp together. Cycle valve at least 6 times. Operate all valves after assembly to be sure they
are operating correctly. Inspect all air line connections for leaks.
3.4
TR and TR2 Stem/Seat Assembly
REMOVAL OF PTFE SNAP-ON SEAT
1. Refer to valve disassembly section to remove stem / seat assembly from valve.
2. Using a knife, partially cut through the upper ring portion of Snap-On Seat, avoiding
contact with stainless steel stem. Grasp both cut ends of Snap-On Seat and force
apart for removal from Stem. Since there are no slots, the TR2 seat will require cutting
through sides and base of seat.
INSTALLATION OF REPLACEMENT PTFE SNAP-ON SEAT
The Alfa Laval replacement Snap-On Seats do not require heat or special tools for proper
installation. Snap-On Seats are installed by applying uniform pressure on all sides. Pressure
can be applied by using a Tri- Clamp or Bevel Seat ferrule the same size as the valve.
Due to the greater force required to instal the TR2 style seat, we recommend using a TR2
seat tool. This holds the seat more securely and can also be used on standard TR seat
installation. See parts list for tool numbers.
SHUT OFF VALVE OR LOWER SEAT OF DIVERT VALVE
1. Place Snap-On Seat on the lower portion of the stem.
2. Place assembly from Step 1 on Tri-Clamp or Bevel Seat ferrule, resting on a hard flat
surface such as a bench or table.
3. Apply firm even downward pressure on the stem until the Snap-On Seat hits the
shoulder of the stem and snaps into place.
4. . Examine seat assembly to be sure each individual tab is secure under the smaller lip
portion of the stem. Press tabs down with your fingers or a straight edge. Holding
Stem/Seat Assembly in one hand, rotate the Snap-On Seat. For proper CIP cleaning
the seat should turn freely on the stem.
5. Refer to valve assembly section for reassembly.
UPPER SEAT OF DIVERT VALVE
1. Place Snap-On Seat on the upper portion of the stem.
2. Place Tri-Clamp or Bevel Seat ferrule on top of assembly, resting on a hard, flat surface
such as a bench or table.
3. Apply firm, even, downward pressure of Tri-Clamp or Bevel Seat ferrule until Snap-On
Seat hits the shoulder of the stem and snaps into place.
4. Examine Seat Assembly to be sure individual tab is secure under the smaller lip portion
of the stem. Press tabs down with your fingers or a straight edge. Holding Seat
Assembly in one hand, rotate the Snap- On Seat. For proper CIP cleaning, seat should
turn freely on the Stem.
5. Refer to valve assembly section for assembly.
Cut here
to remove
seat.
Lip
Straight
Edge
Push Tab Here Up
Shoulder
Lower Portion
Tri-Clamp or Bevel Seat
Ferrule to be same size
as valve
Upper Portion
Tri-Clamp or Bevel Seat
Ferrule to be same size
as valve
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