Install Instructions
Servicing the Relief Valve
Sizes: 2
1
⁄2" – 10" (65-250mm)
1. Remove the relief valve cover bolts. Note the 909 is designed so
that when the bolts are backed off
1
⁄2" all the relief valve spring
load is retained by the bottom plug spring module.
CAUTION: Be sure to verify this before removing all the bolts.
2. Remove the cover and diaphragm. The relief valve piston assem-
bly can be lifted straight up and out.
3. Replace the wiper seal and piston O-ring and apply grease to the O-ring.
4. To replace the relief valve disc, hold the upper guide fin and
unscrew the diaphragm pressure plate. It may be necessary to
lightly tap the cast webs and the pressure plate to loosen.
Replace with a new disc holder assembly and O-ring. Note: the
disc rubber is molded into the disc holder and is supplied as a
disc holder assembly.
5. Removal of the bottom plug and spring assembly. During normal
field service there is no need to remove the bottom plug spring
assembly other than inspection. It can be removed by simply
unscrewing with a large pipe wrench.
CAUTION: The spring as retained on the bottom plug is highly
loaded. NO attempt should be made in the field to remove the
spring. For replacement, a complete bottom plug assembly must be
obtained from the factory.
For further details contact your technical sales representative, see
back page.
909 Repair Kits 2
1
⁄2" – 10" (65 – 250mm)
ORDERING CODE KIT NO. SIZE
Relief Valve Rubber Parts in. mm
0887231 RK 909 RV 2
1
⁄2 – 3 65-80
0887232 RK 909 RV 4 – 6 100-150
0887233 RK 909 RV 8 – 10 200-250
0887234 *RK 909M1 RV 4 – 10 100-250
Kits include: Sleeve o-ring, Seat o-ring, Piston o-ring, Stem o-ring, RV disc assembly,
Diaphragm, Piston seal, Bottom plug o-ring and lubricant
Relief Valve Total
0887235 RK 909 VT 2
1
⁄2 – 3 65-80
0887236 RK 909 VT 4 – 6 100-150
0887237 RK 909 VT 8 – 10 200-250
0887238 *RK 909M1 VT 4 – 10 100-250
Kits include: Adapter o-ring, Diaphragm, Disc & piston assembly, Seat, Seat
o-ring and lubricant. (4" – 10" M1 includes bottom plug & spring assembly.)
Cover Kits
0887740 RK 909 C 2
1
⁄2 – 3 65-80
0887741 RK 909 C 4 100
0887742 RK 909 C 6 150
0887743 RK 909 C 8 200
0887744 RK 909 C 10 250
Kits include: Cover, Cover o-ring and lubricant.
909RPDA Repair Kits 2
1
⁄2" – 10" (65 – 250mm)
Relief Valve Rubber Parts
0887263 RK 909RPDA RV 2
1
⁄2 – 3 65-80
0887264 RK 909RPDA RV 4 – 6 100-150
0887265 RK 909RPDA RV 8 – 10 200-250
0887266 *RK 909RPDAM1 RV 4 – 10 100-250
Kits include: Sleeve o-ring, Seat o-ring, Piston o-ring, Stem o-ring, RV disc assembly,
Diaphragm, Piston seal, Bottom plug o-ring and lubricant
Relief Valve Total
0887259 RK 909RPDA VT 2
1
⁄2 – 3 65-80
0887260 RK 909RPDA VT 4 – 6 100-150
0887261 RK 909RPDA VT 8 – 10 200-250
0887262 *RK 909RPDAM1 VT 4 – 10 100-250
Kits include: Adapter o-ring, Diaphragm, Disc & piston assembly, Seat, Seat o-ring and
lubricant. (4" – 10"M1 includes bottom plug & spring assembly.)
Cover Kits
0887745 RK 909RPDA C 2
1
⁄2 – 3 65-80
0887746 RK 909RPDA C 4 100
0887747 RK 909RPDA C 6 150
0887748 RK 909RPDA C 8 200
0887749 RK 909RPDA C 10 250
Kits include: Cover, Cover o-ring and lubricant.
*M1 = Cast iron relief valve.
Clearance Required for Servicing
in. mm A B
2
1
⁄2 – 3 65-80 10" 11"
4 100 15" 14"
6 150 15" 16"
8 200 23" 21"
10 250 25" 21"
Relief Module
B
Adapter O-ring
Diaphragm
Diaphragm
Relief Valve
Disc
Relief Valve Piston
Assembly
Piston O-Ring
Seat
O-ring
Sizes
2
1
⁄2" – 3"
(65 – 80mm)
Sizes 4", 6"
(100, 150mm)
8"M1, 10"M1
Relief Valve Piston
Assembly
Piston seal
Seat
O-ring
Plug &
Spring
Piston
Assembly
Diaphragm
Sizes 8", 10"
(200, 250mm)
Relief Valve Assembly
Seat
O-ring
Plug & Spring
Assembly
6
Adapter o-ring