Groth 2000A - Manual (Page 8)

8
MODEL 2050A DISASSEMBLY & ASSEMBLY
ITEM DESCRIPTION ITEM DESCRIPTION
1 Body 17 Stem Guide
2 Pallet – Pressure 18 Seat – Vacuum
3 Retainer Plate – Pressure 19 Hex Bolt, 3/8"-16 UNC
4 Flat Washer, 3/8", SS 20 Flat Washer, 3/8", SS
5 Ground Cable 21 Hex Nut, 3/8"-16 UNC
6 Sleeve 22 Lock Washer, 3/8"
7 Hex Nut, 3/8"-16 UNC 23 Pallet – Vacuum
8 N/A 24 Retainer Plate – Vacuum
9 Flat Washer, 3/8", PTFE 25 Crown Nut, 3/8"-16 UNC
10 Diaphragm – Pressure 26 Screen
11 Diaphragm – Vacuum 27 Weatherhood Post
12 Spacer 28 Water Dam*
13 Weatherhood 29 Weight Plate*
14 Stem – Vacuum 30 Handle*
15 Hex Nut, 1/2"-13 UNC 31 Spring
16 Spring Button * Not used on valves with low settings.
2050A Disassembly
1. Read “Warning” sections on page 5. Remove the valve from the tank.
2. Lift pressure/vacuum pallet [2] assembly from body [1].
3. Using the handles [30] on the weight plate [29], or the edges of the pallet, lift vertically. Set the cover
on three evenly spaced support blocks (Figure 6). This will elevate the retainer plate peripheral
guides above the table so they aren’t bent or damaged.
4. Remove nuts [25], lift weatherhood [13], bird screen [26] and set aside. Remove the nut holding the
ground cable [5], and remove the cable.
5. Record “A” dimension (Figure 7). Place a short length of pipe (minimum 6” high) beneath the
vacuum pallet [23] to prevent it from falling. Back the top nut [15] completely off the stem. Compress
the spring using the spring button [16] and grasp the stem (Figure 8). Caution: Remove the second