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5. Slide the spacer (key 23) and the pitot tube (key
18) and attached parts from the valve body.
6. Remove the washer (key 27), the gasket (key 19),
the spacer, the O-rings (key 30), the O-ring holder
(key 21), the O-ring (key 20) and the O-ring
washer (key 22) from the pitot tube.
7. Inspect the O-rings, the gaskets, the spacer, the
orifice and the seating surfaces for damage or
wear and replace parts as necessary.
8. Apply anti-seizing sealant to the adjusting
screw threads and to the end of the adjusting
screw that contacts the spring seat.
9. Slide the O-ring washer, the O-rings (keys 30
and 20), the O-ring holder, the O-ring (key 30),
the spacer, the stem guide assembly, the gasket
and the washer (key 27) onto the pitot tube.
10. Reinstall the stem guide assembly with attached
parts into the valve body and then attach this
assembly with the machine screws (key 29).
11. Replace the diaphragm, the diaphragm head and
the lower spring seat and then secure these parts
with the hex nut (key 24).
12. Reinstall the spring and the spring seat and then
attach the spring case to the valve body using the
machine screws (key 8).
13. If a new spring with a different range is installed,
stamp the spring case with the new spring range.
14. Adjust the spring compression according to the
procedures outlined in the Startup section.
2 NPT Type 289H
All key numbers are shown in Figure 10.
1. Remove the closing cap and the gasket (keys 14
and 15) and then unscrew the adjusting screw
(key 6) to relieve spring compression.
2. Unscrew the machine screw (key 8) and remove
the spring case (key 2), the washer (key 27) and
the spring (key 7).
3. Unscrew the hex nut (key 24), unscrew the
lifting stem (key 25) and then unscrew the hex
nut (key 11).
4. Remove the lower spring seat (key 17), the
diaphragm head (key 3), the diaphragm (key
5), the lower diaphragm head (key 26) and the
gasket (key 19).
5. Unscrew the machine screws (key 29) and
then remove the stem guide assembly (key
31) and attached parts.
7
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6. Slide the spacer (key 23) and the pitot tube (key 18)
and attached parts out of the stem guide assembly.
7. Remove the gaskets (key 19), the spacer (key
23) and the O-ring washer (key 22) from the
pitot tube. Then remove the O-ring washer (key
22) and the orifice (key 10) from the valve body
(key 1).
8. Inspect the O-rings, the gaskets, the spacer,
the orifice and the seating surfaces for damage
or wear and replace parts as necessary.
9. Apply anti-seizing sealant to the orifice
threads and then to the adjusting screw threads.
10. Reinstall the orifice and the O-ring (key 20) into
the valve body.
11. Slide the gasket, the O-ring washer, the gasket,
the spacer, the stem guide assembly and the
gasket onto the pitot tube.
12. Reinstall the stem guide assembly with attached
parts into the valve body and attach it with the
machine screws (key 29).
13. Replace the lower diaphragm head, the
diaphragm, the diaphragm head and the lower
spring seat; then secure these parts with the hex
nut (key 11). Screw in the lifting stem and lock it
in place with the hex nut (key 24).
14. Reinstall the spring and the washer.
Note
For 2 NPT Type 289H relief valves, when
changing from one spring range to
another, use a new spring case to
position the travel stop drive screw
correctly for the corresponding spring
range. Each spring range requires that
the travel stop drive screw be
positioned appropriately in the spring
case to prevent setting the relief valve
pressure too high. The location of the
travel stop drive screw for each spring
and spring range is shown in Figure 5.
15. Attach the spring case to the valve body using the
machine screws (key 8).
16. If a new spring with a different range is installed,
stamp the spring case with the new spring range.
17. Adjust the spring compression according to the
procedures outlined in the Startup section. Then
install the gasket and the closing cap.
289 Series
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