Type Y696
5
1. To inspect and replace the disk assembly (key 25)
or orifice (key 27), remove the body cap assembly
(key 38).
2. Remove the disk screw (key 47) and cotter pin
(key 14) from the disk shutoff stem (key 40) if it is
necessary to replace the disk assembly (key 25).
3. To inspect and replace the orifice (key 27), loosen
the union nut (key 19) and separate the diaphragm
case assembly from the body (key 28).
4. Remove and inspect the body gasket (key 16).
5. Inspect and replace the orifice (key 27) if necessary.
Lubricate the threads of the replacement orifice with a
good grade of pipe thread sealant. Install and tighten
using 75 to 100 ft-lbs / 102 to 136 N•m of torque.
6. If necessary, install the replacement body gasket
(key 16) into the body (key 28).
7. Slide the union nut (key 19) as far as it will go onto
the lower casing assembly (key 20). Install both
halves of the split ring (key 17) into the slots of the
lower casing assembly (key 20) and secure them
by sliding the union nut down on the split ring.
note
In the following step, be sure to install
the spring case barrel pointed down as
shown in Figure 1.
8. Install the lower casing assembly (key 20) by
tightening the union nut (key 19) until the lower
casing assembly is secure on the body (key 28).
9. Install the disk spring (key 41) and disk assembly
(key 25) and secure it to the disk stem (key 40)
with the cotter pin (key 14). Install the disk screw
(key 47).
10. Use a good quality thread sealer when replacing
the body cap assembly (key 38).
Diaphragm and Spring case Area
This procedure is for gaining access to the control
spring, diaphragm and lever assembly stem. All
pressure must be released from the diaphragm case
assembly before the following steps can be performed.
To Change the Control Spring:
1. Remove the closing cap (key 3) and turn the
adjusting screw (key 2) counterclockwise until all
compression is removed from the control spring
(key 1).
2. Remove the adjusting screw (key 2) and the upper
spring seat (key 44) and change the control spring
to match the desired spring range.
3. Replace the upper spring seat (key 44) and the
adjusting screw (key 2).
4. Install a replacement closing cap gasket (key 35), if
necessary and reinstall the closing cap (key 2).
5. If the spring range was changed, be sure to
change the stamped spring range on the spring
case nameplate.
To Maintain Diaphragm Parts:
1. Remove the closing cap (key 3) and the adjusting
screw (key 2).
2. Remove the hex nuts (key 22), cap screws
(key 21) and spring case (key 23).
3. Lift the upper spring seat (key 44) and control
spring (key 1) off the diaphragm and plate
assembly (key 5).
4. Remove the diaphragm and plate assembly (key 5)
by tilting them so that the pusher post (key 8) slips
off the lever assembly (key 9).
5. To separate the diaphragm assembly (key 5) from
the attached parts, unscrew the cap screw (key 30)
from the pusher post (key 8).
6. To replace the lever assembly (key 9), remove
the machine screws (key 11). To replace the stem
(key 13) pull the stem (key 13) out of the lower
casing assembly (key 20).
7. Install the stem (key 13) into the lower casing
assembly (key 20).
8. Install the lever assembly (key 9) into the stem
(key 13) and secure the lever assembly (key 9)
with the machine screws (key 11).
9. During the assembly procedure, use lubricants on
parts as indicated in Figure 3 and replace parts
as required.
