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YARWAY 9100 SERIES ARC
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
TABLE 4 – BODY BONNET NUTS
Valve Size
in.
[mm]
1 - 1½
[25 - 40]
2
[50]
3
[80]
4
[100]
6
[150]
8
[200]
10. Check valve stroke by pushing the bottom of the bypass stem with wood or soft metal rod. The
disc assembly must move freely (against spring load) for the entire stroke length. The stroke
length must be as follows:
TABLE 5 – DISC STROKE
Valve Size
in.
[mm]
1 - 1½
[25 - 40]
2
[50]
3
[80]
4
[100]
6
[150]
8
[200]
11. For valves with an integral back pressure regulator:
a. Install new regulator capsule, if defective. Lube the O-ring with O-ring lubricant and install
the back pressure regulator capsule into the body.
b. Install the spiral ring into the body groove (lubricate bottom side with Anti-Seize).
c. Coat exposed threads with a thread locking adhesive appropriate for the valve service
temperatures. Back the retaining ring out to load the back pressure regulator capsule with
the required torque as shown in Table 6. Remove and discard the draw bolt and washer
(used to hold the capsule assembly together.) Stake the plunger guide into the retaining ring.
Do not stake toward the centerline of the back pressure regulator.
TABLE 6 – BPR RETAINING RING (spanner nut)
Regulator Size
in.
[mm]
1½
[40]
2
[50]
3
[80]
4
[100]
6
[150]
12. For valves with a flow conditioner (31), a replacement can be installed and tack welded in
place. Weld four places, 90 degrees apart. See Table 7 for weld size and width.
TABLE 7
Valve Size
in.
[mm]
2
[50]
3
[80]
4
[100]
6
[150]
8
[200]
VALVE
®
Nut Size
in.
ft/lb
- 12
65 - 70
9
/
16
⅝ - 11
70 - 80
¾ - 10
120 - 140
⅞ - 9
180 - 220
1⅛ - 8
450 - 500
1¼ - 8
600 - 660
in.
/
7
16
⅝
1
/
5
16
1¼
1½
2
Nut Size
in.
ft/lb
1⅛ - 12
20 - 25
1
- 12
45 - 55
/
7
16
2⅛ - 12
100 - 120
2⅞ - 12
180 - 220
4¾ - 12
300 - 340
Weld Size
in.
[mm]
⅛
[3]
⅛
[3]
⅛
[3]
¼
[6]
¼
[6]
Torque
[N•m]
[88 - 95]
[95 - 109]
[163 - 190]
[244 - 298]
[610 - 678]
[814 - 895]
Stroke Length
[mm]
[11]
[16]
[24]
[32]
[38]
[50]
Torque
[N•m]
[27 - 34]
[61 - 75]
[136 - 163]
[244 - 298]
[406 - 460]
Weld Width
in.
[mm]
[5]
3
/
16
¼
[6]
⅜
[10]
½
[13]
⅝
[16]
6
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