Liquid Controls Air Actuated & Differential Check Valves K-7, K-15, & K-30 - Manual (Page 5)

5
K-7 Valves
Disassembling the K-7 Valve
NOTE: Refer to the illustrated parts breakdown to the right
for Item Numbers referenced in these instructions. Item
Numbers appear in circles in the drawing.
1 Use a fixture to press and hold the piston (Item 220)
in place with the compression spring (Item 389)
compressed.
2 Loosen the three screws (Item 615) that hold the seal
ring (Item 354).
3 Slowly remove the fixture holding the piston (Item 220)
and compression spring (Item 389) until the spring
exerts NO pressure.
4 Remove the seal ring (Item 354), piston (Item 220)
and compression spring (Item 389).
5 Remove the Quad Ring (Item 465) from the piston
(Item 220). Replace necessary components and
reassemble.
Reassembling the K-7 Valve
1 Place the compression spring (Item 389) over the
valve stem in the valve housing (Item 110).
2 Place the Quad Ring (Item 465) on the piston (Item
220).
3 Place the piston (Item 220) over the compression
spring (Item 389).
4 Place the seal ring (Item 354) on the piston (Item 220).
5 Place the piston (Item 220) and seal ring (Item 354)
on top of the compression spring (Item 389) and
compress using a fixture to hold the assembly in
place, leaving the seal ring (Item 354) free to rotate.
6 Line up the holes of the seal ring assembly (Item 354)
with the holes of the housing assembly (Item 110)
and screw in the three screws (Item 615). Tighten
the screws.
7 When the screws are tight, remove the fixture used
to hold the piston and spring in compression.