PVA 112-2190, Operation Manual, Page: 17 / 34

FCS300 Series Manual
Revision D /
June 2020
Page 17 of 34
5. Pull the air section (red anodized portion) away from the fluid section (stainless
steel portion).
6. Clean off the tip of the stainless-steel needle (1){1}[1]<3>.
7. From the fluid section of the valve, unthread and remove the packing nut, and the
packing (14){14}[16]<15>.
8. Unthread and remove the collar ring (16){16}[18]<17> followed by the air cap
(17){18}[6]<2>.
9. Using the seat wrench, unthread and remove the seat (4){4}[4]<1> followed by the
007 Kalrez o-ring (20){21}[21]<20>.
Note: The teeth of the seat wrench are tapered so the wrench will only fit on one
side.
10. Clean all of the wetted parts thoroughly with an appropriate solvent.
11. On the air section, use a standard 3/32” Allen key to evenly remove the two
machine screws (7){7}[9]<8> that thread into the end cap (11){11}[13]<12>.
Note: During removal, the spring will force the air section apart.
12. Separate the upper air body (2){2}[2]<4> from the lower air body (12){12}[14]<13> to
remove the spring then slide the end cap off the needle.
13. Holding the lower air body in one hand, grab the needle and push the needle and
piston (13){13}[15]<14> assembly out of the lower air body.
14. Remove the 004 Buna o-ring (18){19}[19]<18> from the lower air body.
15. Hold the piston with an adjustable wrench then use a 5/64” Allen key to unthread
and remove the set screw (9){9}[11]<10> to remove the needle then remove the 014
Buna o-ring (20){21}[22]<20> from the piston.
16. Remove the 014 Buna o-ring from the upper air body then use a 1/16” Allen key to
remove the set screw.
17. Using soft tip pliers grip the collar (E) or midsection (D) of the micrometer
(5){5}[7]<6> and turn counterclockwise to loosen then unthread and remove from
the upper air body by hand.
18. Remove the 007 Buna o-ring (19){20}[20]<19> from the micrometer.
19. Replace components with spares provided in the spare parts kit.