Groth 2000A - Manual (Page 7)

7
MODEL 2000A DISASSEMBLY & ASSEMBLY
ITEM DESCRIPTION ITEM DESCRIPTION
1 Body 7 Hex Nut, 3/4"-10 UNC
2 Pallet 8 Washer, 3/4", PTFE
3 Retainer Plate 9 Diaphragm
4 Flat Washer, 3/4", SS 10 Hex Bolt, 3/4"-10 UNC
5 Ground Cable 11 Weight Plate(s)*
6 Sleeve 12 Eye Nut*
* Not used on valves with low settings
2000A Disassembly
1. Read “Warning” sections on page 5. Remove the valve from the tank.
2. Using the eye nut [12], or the edges of the pallet, lift vertically. Set the cover on a short length of pipe
(minimum 6” high). This will elevate the retainer plate peripheral guides above the table so they
aren’t bent or damaged.
3. Place the assembly with the ¾” hex bolt in a vise, or use a wrench to hold the center bolt from the
bottom side. Loosen the hex nuts and remove. Lift the weight plate [11], pallet [2], and diaphragms
[9].
2000A Assembly
1. Prior to final assembly, verify that the body seat area is free of corrosion, damage or product build-up.
The seat should be carefully cleaned, if necessary.
NOTE: If the seat is damaged it must be lapped using a perfectly flat ground metal disc. Wipe
seating surface clean before proceeding. Soft goods should normally be replaced whenever
valve maintenance is performed.
2. Reverse the steps of Disassembly, starting with the retainer and cover. If a diaphragm is an
elastomer, place it between the fluoropolymer diaphragm and the retainer plate. See Figure 3b.
NOTE: When replacing the ground cable, surface corrosion must be completely cleaned to allow
cable to ground pallet to tank nozzle.
3. The valve should be tested on a pressure test stand to verify the settings and evaluate seat tightness
follow instructions on page 19. Mount valve on tank; see Installation on page 6.