Control Units

Control units must be used to limit the amount and direction of movement to within the design limits of the flexible connection. These units consist of adapter plates which are bolted to the back of the mating pipe flanges.

Expansion joints and pump connectors are not designed to support weight or limit pipe movement. Excess movement may be the result of abnormal temperature fluctuations, pressure surges, or insufficient anchoring or guiding of the piping. Where these situations occur, control units must be used to limit the amount and direction of movement to within the design limits of the flexible connection.

Control units consist of adaptor plates which are bolted to the back of the mating pipe flanges. These plates are connected by a tie rod which limits the axial extension. In cases where excess compression is anticipated, an optional sleeve is fitted over the tie rod to limit movement in both directions. The minimum number of control rods needed in a control unit is two; however depending on size or pressure, more may be required. The chart below can be used to determine the requirements for your application.

 request quote
inside diameter max surge or test pressure of the system psig rec number of control rods
1/2" 1328 / (2)
3/4" 1106 / (2)
1" 949 / (2)
1 1/4" 830 / (2)
1 1/2" 510 / (2)
2" 661 / (2)
2 1/2" 529 / (2)
3" 441 / (2)
3 1/2" 365 / (2), 574 / (3), 729 / (4)
4" 311 / (2), 467 / (3), 622 / (4)
5" 135 / (2), 353 / (3), 470 / (4)
6" 186 / (2), 278 / (3), 371 / (4)
8" 163 / (2), 244 / (3), 326 / (4)
10" 163 / (2), 244 / (3), 325 / (4), 488 / (6)
12" 160 / (2), 240 / (3), 320 / (4), 481 / (6)
14" 112 / (2), 167 / (3), 223 / (4), 335 / (6)
18" 94 / (2), 141 / (3), 187 / (4), 281 / (6), 375 / (8)
20" 79 / (2), 118 / (3), 158 / (4), 236 / (6), 315 / (8)
22" 85 / (2), 128 / (3), 171 / (4), 256 / (6), 342 / (8)
24" 74 / (2), 110 / (3), 147 / (4), 221 / (6), 294 / (8)
26" 62 / (2), 93 / (3), 124 / (4), 186 / (6), 248 / (8)
28" 65 / (2), 98 / (3), 130 / (4), 195 / (6), 261 / (8)
30" 70 / (2), 105 / (3), 141 / (4), 211 / (6), 281 / (8)
32" 63 / (2), 94 / (3), 125 / (4), 188 / (6), 251 / (8)
34" 72 / (2), 107 / (3), 143 / (4), 215 / (6), 286 / (8)
36" 69 / (2), 103 / (3), 138 / (4), 207 / (6), 276 / (8)
38" 63 / (2), 94 / (3), 125 / (4), 188 / (6), 251 / (8)
40" 42 / (2), 63 / (3), 85 / (4), 127 / (6), 169 / (8)
42" 48 / (2), 72 / (3,) 96 / (4), 144 / (6), 192 / (8)
44" 44 / (2), 66 / (3), 88 / (4), 133 / (6), 177 / (8)
46" 41 / (2), 61 / (3), 82 / (4), 122 / (6), 163 / (8)
48" 40 / (2,) 60 / (3), 81 / (4),121 / (6), 161 / (8)
50" 37 / (2), 56 / (3), 75 / (4), 112 / (6), 150 / (8)
52" 35 / (2), 53 / (3), 70 / (4), 105 / (6), 140 / (8)
54" 43 / (2), 64 / (3), 86 / (4), 128 / (6), 171 / (8)
56" 40 / (2), 60 / (3), 80 / (4), 120 / (6), 160 / (8)
58" 37 / (2), 56 / (3), 75 / (4), 150 / (8), 113 / (6)
60" 35 / (2), 53 / (3), 71 / (4) ,106 / (6),141 / (8)
62" 33 / (2), 50 / (3), 66 / (4), 100 / (6), 133 / (8)
66" 30 / (2), 44 / (3), 59 / (4), 89 / (6), 119 / (8)
72" 25 / (2), 38 / (3), 50 / (4), 75 / (6), 101 / (8)
78" 28 / (2), 42 / (3), 56 / (4), 84 / (6), 112 / (8)
84" 24 / (2), 37 / (3), 49 / (4), 73 / (6), 98 / (8)
90" 26 / (2), 40 / (3), 53 / (4), 79 / (6), 106 / (8)
96" 29 / (2), 43 / (3), 58 / (4), 86 / (6), 115 / (8)
16" 113 / (2), 170 / (3), 227 / (4), 340 / (6), 435 / (8)

All EVR products are guaranteed for one full year against defects resulting from faulty workmanship or materials. If any such product is found to be defective by reason of faulty workmanship or materials, upon written notice and return of the product, the defective product will be replaced by us free of charge, including the shipping charges for the replacement product. Claims for labour costs and other expenses required to replace such defective product, or to repair damage resulting from the use thereof will not be allowed by us. Our liability is limited to the price paid for the defective product. EVR Products shall not be bound by any warranty other than the above set forth unless such warranty shall be in writing. This literature is published in good faith and is believed to be reliable, however, EVR Products does not represent and/or warrant in any manner the above information and suggestions contained in this brochure. Data presented is the result of laboratory tests and field experience.