Marwin Valve CV3000 Series Characterized Insert Control Valve - Manual (Page 4)

Packing Adjustment
Body Bolt Torque Valve Table (ft/lbs)
Series/Size Bolt Information Bolting Material
3000 Bolt Size Bolt Qty (per end cap) BD Steel B7M Nace B8 St STl
1/4" - 1/2"R 5/16-18 4 20 10 8
3/4"R - 1/2"F 5/16-18 4 20 10 8
1"R - 3/4"F 3/8-16 4 25 21 14
1-1/4"R - 1"F 7/16-14 4 33 30 23
1-1/2"R - 1-1/4"F 1/2-13 4 54 42 33
2"R - 1-1/2"F 9/16-12 4 60 52 47
2-1/2"R - 2"F 1/2-13 6 54 42 33
3"R - 2-1/2"F 1/2-13 9 54 42 33
4"R - 3"F 9/16-12 8 60 52 47
Socket Hex
Socket O.D.
Valve Size Socket O.D. Max Socket Hex
1/4"F - 3/4"F 0.66" 13 mm
3/4"F -1-1/4"R 0.91" 17 mm
1-1/4"F - 2"R — 22 mm
2"F - 2-1/2"R — 1"
2-1/2"F - 3"R — 1-1/4"
3"F - 4"R — 1-1/2"
Troubleshooting
A. Stem Leakage
1. Leakage in the stem packing area may be eliminat-
ed by increasing the torque on the stem nut (22) in
one-quarter turn increments. Some size valves may
require a thin wall socket (or turned down equiva-
lent). If leakage persists, replace stem packing (18)
and stem o-ring (23).
B. Body Seal Leakage
1. Check the torque of the body bolts (12) according
to Torque Table. Replace body seals (6 & 7) if leak-
age persists.
C. In Line or Seat Leakage
1. Check to be sure line flow is in same direction as
across side of valve body.
2. Check to be sure valve is in fully closed position. If
leakage persists, the valve must be disassembled
and damaged parts replaced.
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