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This handbook will discuss the basic sizing used

 

for our larger 

Well-X-Trol

®

s

 such as WX-400, 420, 

440, and 450 series. This allows you to use the 

Well-

X-Trol

®

 “principle of separation of air and water” on 

larger jobs that are beyond the typical residential 

range.
The 

Well-X-Trol

®

 models we’ll be working with in 

this handbook are listed in Table 1.
The design features of these larger models allow 

us to apply them more creatively than the smaller 

residential models found in the 

Well-X-Trol

®

 100, 

200, and 250 series.

The Larger Well-X-Trol

®

s are Designed and Built 

for Maximum Acceptance on Each Operating 

Cycle

In the smaller residential 

Well-X-Trol

®

s

, the design 

is for basic intermittent use and for the  usually 

found in residential applications. Standard pressure 

ranges of (20) PSIG (between pump cut-in and 

pump cut-out) are used.
In these applications, full use of the maximum 

acceptance volume of the 

Well-X-Trol

®

 is rarely 

required to meet job conditions.

Series 420 & 447

Pressure Switch

Table 1.

WX Model No.

NON-CODE

(NON-AS ME )

WX Model

No.

COD E

(ASM E)

Total

Volume

(Gallons)

Maximum

Acce ptance

Volume

(Gallons)

Maximum

Acce ptance

Factor

(MAF )

WX-401

WX-401-C

17.5

11.25

.65

WX–402

WX–402-C

25

11.25

.45

WX-403

WX-403-C

34

11.25

.33

WX-404

WX-404-C

68

34

.50

WX-405

WX-405-C

90

34

.39

WX-406

WX-406-C

110

34

.31

WX-407

WX-407-C

132

46

.35

WX-421

Not available

158

103

.65

WX-422

Not available

211

137

.65

WX-423

Not available

264

172

.65

WX-424

Not available

317

206

.65

WX-426

Not available

422

274

.65

WX-427

Not available

528

343

.65

WX-447

WX-447-C

53

34

.65

WX-448

WX-448-C

80

52

.65

WX-449

WX-449-C

106

69

.65

WX-450

WX-450-C

132

86

.65

WX-451

WX-451-C

158

102

.65

WX-452

WX-452-C

211

136

.65

WX-453

WX-453-C

264

170

.65

WX-454

WX-454-C

317

205

.65

WX-455

WX-455-C

370

239

.65

WX-456

WX-456-C

422

273

.65

WX-457

WX-457-C

528

341

.65

Based on 30 PS IG p re-charge  (P

1

)

1400 Division Road, West Warwick, RI 02893    T: 401.884.6300    F: 401.885.2567    www.amtrol.com

SIZING INSTRUCTIONS

WELL-X-TROL

®

POTABLE WATER WELL TANK

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