Assembly and Disassembly
To ensure quality operation of your Dixon
®
equipment, the equipment must be disassembled and assembled properly to prevent
equipment damage during operation. Please follow the instructions contained in this manual carefully and be sure to follow any safety
warnings contained herein. If any questions should arise during the assembly or disassembly process that are not addressed in this
manual, please feel free to contact Dixon
®
– Sanitary Division at 800.789.1718.
Assembly
1.
Before reassembling the valve, examine the parts and repair or replace damaged or worn parts.
Dixon
recommends using
new seats and seals at each assembly.
2.
Insert the stem #5 (with O-ring #7) and PTFE thrust washer #6 into the body #1 and through the stem bore in the body.
3.
Install PTFE stem packing rings #8 over the stem and into the body bore.
4.
Install the gland ring #9 and two spring washers #10 such that the lower washer’s concave side is facing upward and the top
washer is opposite.
5.
Lubricate the gland nut threads #13 with appropriate food grade anti-seize. Install and tighten the gland to compress the
packing. The gland should be tightened just until snug.
6.
Lubricate the stem threads with an anti-galling lubricant.
7.
Install the 3
rd
washer #10 over the stem (concave side is facing upward). Place the handle (#15 or #15 A, B and C) on the
stem such that the handle is parallel to the line when the valve is in the open position.
8.
Install the handle nut #13.
9.
Position the stem to close the valve. Insert the ball #3 into the body. Slide the stem tang into the ball slot, being careful not to
nick or scratch the ball.
10.
Rotate the stem until the ball is in the open position.
11.
Install valve seats #4 into the body.
12.
Place a new body seals #17 in the mating cavities in the body making sure the seats and seals remain in position.
13.
For valves with Clamp end caps, insert the end caps #2 onto the body, taking care not to cut seals.
14.
For valves with end caps welded into piping, with valve open, spring end caps outward and slide body between them.
Release spring force from end caps to allow end cap flanges to sit flush against the body. Take care not to cut seals.
15.
Turn the stem and close the valve.
16.
Install bolts #14 or #14A with washers. Install and hand-tighten nuts.
17.
Wrench tighten nuts in sequence shown in Table 1 (Page 14), keeping gap between body and end caps even and until
assembly torque (Page 8) is reached.
18.
Remove the handle and finish tightening the gland nut until break torque (Page 8) is reached. Measure stem breakaway
torque for several cycles to verify repeatability. (Over-tightening significantly raises stem torque.) Re-assemble handle.
19.
If the valve has Clamp end caps, reinstall the valve into the piping using appropriate gaskets and clamps.
20.
If practical, leak test the seats, gaskets, and packing.
21.
Dixon Sanitary recommends replacement of any valve exposed to fire.
Tightening procedure for end connections:
1. Hand-tighten fasteners.
2. Wrench-tighten each fastener in the sequence illustrated until lock washers begin to compress.
3. Continue tightening bolts 1/8 turn until recommended assembly torque value (see page 8) is achieved.
4. Confirm valve torque at stem.
14
dixonvalve.com • 800.789.1718
BV2C
IOM
