Kenco Engineering Valve Replacement Kit - Manual (Page 4)

Figure 5
Valve set up
Note: For safety reasons, KENCO Engineering recommends the use of air only when setting up the valve. If natural gas is
being used as the supply gas, temporarily connect a portable air tank pressurized with air to adjust the switch. Make sure
the supply pressure is within the rated range of 30-75 PSI and the air is clean and dry. Once the switch is adjusted,
disconnect the portable air tank and reconnect the supply gas.
 Make sure the Switch Float is in the “Valve Closed” position. On the KPFS-LR model, the Switch Float will need to be in the
down position. On the KPFS-LF model, the Switch Float will need to be in the up position. You will know which model you
have by the model number on the Switch Enclosure Cover name tag. In addition to this, the KPFS-LF has a counter weight
attached to the Lever Arm and the KPFS-LR does not. See illustrations in Figure 5.
 Turn off the air supply line pressure to the switch if system is pressurized.
 Remove the Switch Enclosure Cover on the end of the switch body.
 Remove the 0.050” “L” Shaped Hex Allen Wrench from inside the Switch Enclosure Cover by loosening the Wrench
Retaining Screw.
 Using the 0.050” “L” Shaped Hex Allen Wrench supplied with the switch, loosen the Hex Socket Head Set Screw located at
the 12 o’clock position inside the switch enclosure.
Important: Only loosen the Hex Socket Head Set Screw 1 to 1-1/2 turns.
 The Adjustable Needle Valve Seat is designed to be raised and lowered using the “L” Shaped Hex Allen Wrench supplied
with the switch. There are six holes in the seat and you can only turn one hole at a time. It takes six turns to rotate the seat
one complete revolution. A good starting point for adjustment is to raise the Needle Valve Seat until it bottoms out against
the Valve Base. Insert the long end of the wrench into one of the holes in the Needle Valve Seat and turn it to the right as
far as possible before moving the wrench to the next hole.
 Once the Needle Valve Seat is bottomed out against the Valve Base, lower the Needle Valve Seat 6 turns to the left or one
complete revolution.
Important: Great care must be taken here. If the Needle Valve Seat is lowered so much that the Lever Arm is in
a bind, damage to the Needle and/or Lever Arm can occur. During adjustment, continuously check the
movement of the Lever Arm by gently toggling it with your finger to make sure it moves up and down freely. If
the Lever Arm does not move up and down freely, the Needle Valve Seat has been lowered too much and has
the Lever Arm in a bind. If this is the case, raise the Needle Valve Seat by turning the wrench to the right until
the Lever Arm moves freely.
 With this starting point established, pressurize the system somewhere within the 30-75 psig switch pressure range.
 Air should be leaking from the Needle Valve Seat. If it is not, toggle the Lever Arm and/or Switch Float to verify that the
valve is shifting properly.
Note: If air is still not leaking from the Needle Valve Seat, raise the seat by turning the wrench to the right until
you hear the air leaking.
 While the air is leaking, pay close attention to the sound it makes as it leaks out.
 Slowly lower the Needle Valve Seat by turning the wrench to the left until you hear the air stop leaking.
 When you hear the air stop leaking, lower the Needle Valve Seat an additional 1 to 1-1/2 turns. This will put the right amount
of preload on the Needle Valve Seat to ensure that the valve opens when the Switch Float is level.
 Gently toggle the Lever Arm a few times to make sure it moves up and down freely and to verify that the valve is opening
and closing properly.
 Tighten the Hex Socket Head Set Screw.
 Reinstall the Hex Allen Wrench inside the Switch Enclosure Cover and reinstall the Switch Enclosure Cover.
 Your KPFS is now ready for operation.
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