Miyawaki
Miyawaki RE20L With Pulse Line For Steam
Manufacturer: Miyawaki Inc.
Model: RE20L
Features
Pressure reducing valves for steam
These are automatic valves that reduce the steam supply pressure to the certified pressure for the device in use, and keep it steady.
Operating features of direct acting pressure reducing valves
Pressure changes on the secondary side are detected in the detection chamber, and the degree of opening of the valve is directly adjusted to keep the pressure on the secondary side at a set level.
Due to carefully selected springs a wide range of pressure applications is available.
Maximum pressure reduction ratio 25:1
As option the valve can be equipped with a pressure gauge on the valve body.
Uses
Perfect for cleaning devices, foodstuff devices, and other forms of compact steam equipment.
Dimensions/Weight
Size (DN) |
Dimensions (mm) | Kvs Value | Weight (kg) | ||
L | H | h | |||
15 | 130 | 435 | 82 | 1,8 | 13,0 |
20 | 150 | 66 | 3,2 | 13,0 | |
25 | 160 | 66 | 5,0 | 14,5 | |
32 | 180 | 81 | 7,9 | 16,0 | |
40 | 200 | 83 | 13,0 | 18,0 | |
50 | 230 | 647 | 100 | 20,0 | 34,0 |
65 | 290 | 690 | 113 | 34,0 | 45,0 |
80 | 310 | 828 | 140 | 51,0 | 61,0 |
100 | 350 | 850 | 154 | 80,0 | 87,0 |
125 | 400 | 715 | 210 | 130,0 | 150,0 |
150 | 480 | 720 | 235 | 180,0 | 180,0 |
200 | 600 | 950 | 285 | 320,0 | 330,0 |
Specifications
PN16 | PN25 | |
Max. design pressure (MPa) PMA | 1,6 | 2,5 |
Max. design temperature (℃) TMA | 350 | 350 |
Max. operating pressure (MPa) PMO | 1,5 | 2,2 |
Max. operating temperature (℃) TMO | 350 | 350 |
Pressure – Temperature rating
PN | Temperature ℃ | ||||||
-10・・・+50 | 100 | 150 | 200 | 250 | 300 | 350 | |
Pressure MPa | |||||||
PN16 | 1,6 | 1,6 | 1,6 | 1,5 | 1,4 | 1,3 | 1,1 |
PN25 | 2,5 | 2,5 | 2,4 | 2,3 | 2,2 | 2,0 | 1,8 |
Secondary pressure range |
DN15-DN40 | DN50 | DN65 | DN80 | DN100 | DN125-DN200 |
MPa | Spring number per size | |||||
0,05-0,1 | 6 | 28 | 27 | 38 | 37 | On request |
0,1-0,16 | 5 | 27 | 26 | 37 | 36 | |
0,16-0,25 | 4 | 26 | 25 | 36 | 35 | |
0,25-0,4 | 3 | 25 | 24 | 35 | 34 | |
0,4-0,63 | 2 | 24 | 23 | 34 | 33 | |
0,63-1,0 | 1 | 23 | 22 | 33 | 32 |
Secondary pressure ranges higher than 1,0 MPa and lower than 0,05 MPa on request available.
Minimum differential pressure :0.5 bar (DN15-50), 0.7 bar (DN65-125), 1bar (DN150-200)
Capacity Chart
Tables of calculation for steam
RE20 (REH20, REC20)
RE20L (REH20L, REC20L)
How to select the size of a PRV correctly?
If the ratio between the downstream pressure p₂ and the inlet pressure p₁ is larger than 0.577 (non-critical flow), the available steam flow amount on the downstream side will be reduced. To get the maximum available downstream flow amount, the maximum steam flow from Table 1 must be multiplied with the calculation factor A. To get the Factor A see the Diagram 1.
Check if the requested steam flow matches the downstream side using Table 2 (page 16) for flows under 40 m/s. Choose the size based on barg pressure. If downstream piping is 1–2 sizes larger than the PRV inlet, you’re good. If the size difference is over 2, increase the PRV size. Keep the difference within 2 sizes!
Example of calculation
Operating data:
- p₁ = 9 barg = 10 bar_abs
p₂ = 6 barg = 7 bar_abs
Steam flow G = 1,100 kg/h
Search for the necessary size of the PRV in accordance with p₁.
- Table 1 shows 1,312 kg/h for size DN40 (1½”).
- bar_abs = 0.7 (i.e., larger than 0.577)
- Factor A acc. to Diagram 1 = 0.96
- Max. available steam flow G = 1,312 kg/h × 0.96 = 1,259 kg/h.
Steam flow in accordance with Table 2 at 6 barg = 1,720 kg/h for DN65.
Conclusion:
The PRV with an inlet size of DN40 and increase of the pipe size to DN65 at the downstream side will be suitable for a flow amount of 1,100 kg/h at the given pressures.
Capacity Chart
The Table 1 shows the maximum available steam flow amount of the pressure reducing valve at a given inlet pressure, if the ratio between the downstream pressure p₂ and the inlet pressure p₁ is lower than 0.577 (critical flow). Pay attention that the inlet steam pressure p₁ is shown as bar_abs.
Table 1
P1 | Steam Flow per DN in kg/h | |||||||||||
(bar abs) | 15 | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 |
1,1 | 21 | 38 | 59 | 94 | 154 | 238 | 405 | 607 | 952 | 1.545 | 2.14 | 3.81 |
1,2 | 23 | 41 | 64 | 101 | 167 | 257 | 437 | 655 | 1.028 | 1.67 | 2.313 | 4.112 |
1,3 | 25 | 44 | 70 | 110 | 181 | 279 | 474 | 711 | 1.116 | 1.813 | 2.511 | 4.464 |
1,4 | 27 | 48 | 75 | 119 | 195 | 300 | 510 | 765 | 1.2 | 1.951 | 2.702 | 4.803 |
1,5 | 29 | 51 | 80 | 127 | 208 | 320 | 545 | 818 | 1.283 | 2.085 | 2.887 | 5.133 |
1,6 | 30 | 54 | 85 | 135 | 222 | 342 | 581 | 871 | 1.366 | 2.22 | 3.074 | 5.466 |
1,7 | 32 | 58 | 91 | 143 | 236 | 363 | 617 | 926 | 1.452 | 2.36 | 3.267 | 5.808 |
1,8 | 34 | 61 | 95 | 151 | 248 | 382 | 649 | 973 | 1.526 | 2.48 | 3.434 | 6.105 |
1,9 | 36 | 64 | 101 | 159 | 262 | 402 | 684 | 1.026 | 1.61 | 2.616 | 3.622 | 6.438 |
2,0 | 38 | 68 | 106 | 167 | 275 | 424 | 720 | 1.081 | 1.695 | 2.755 | 3.814 | 6.781 |
2,2 | 42 | 74 | 116 | 184 | 302 | 465 | 790 | 1.185 | 1.859 | 3.021 | 4.183 | 7.437 |
2,4 | 45 | 81 | 126 | 200 | 329 | 506 | 860 | 1.289 | 2.022 | 3.286 | 4.55 | 8.09 |
2,6 | 49 | 87 | 136 | 215 | 354 | 545 | 926 | 1.389 | 2.179 | 3.541 | 4.903 | 8.717 |
2,8 | 52 | 92 | 144 | 227 | 373 | 575 | 977 | 1.465 | 2.298 | 3.735 | 5.171 | 9.194 |
3,0 | 56 | 101 | 157 | 248 | 409 | 629 | 1.069 | 1.603 | 2.514 | 4.086 | 5.657 | 10.058 |
3,5 | 65 | 116 | 182 | 287 | 472 | 727 | 1.236 | 1.854 | 2.908 | 4.726 | 6.543 | 11.632 |
4,0 | 75 | 133 | 207 | 328 | 539 | 830 | 1.411 | 2.116 | 3.319 | 5.394 | 7.468 | 13.277 |
4,5 | 84 | 149 | 232 | 367 | 604 | 929 | 1.58 | 2.369 | 3.717 | 6.04 | 8.367 | 14.867 |
5,0 | 93 | 165 | 258 | 408 | 671 | 1.032 | 1.755 | 2.632 | 4.129 | 6.709 | 9.29 | 16.515 |
5,5 | 99 | 176 | 274 | 433 | 714 | 1.097 | 1.865 | 2.798 | 4.389 | 7.132 | 9.875 | 17.555 |
6,0 | 111 | 197 | 308 | 486 | 800 | 1.23 | 2.092 | 3.138 | 4.922 | 7.998 | 11.074 | 19.686 |
6,5 | 119 | 213 | 332 | 525 | 864 | 1.329 | 2.259 | 3.388 | 5.315 | 8.637 | 11.959 | 21.261 |
7,0 | 129 | 229 | 358 | 565 | 930 | 1.431 | 2.433 | 3.649 | 5.724 | 9.302 | 12.879 | 22.896 |
7,5 | 138 | 245 | 382 | 604 | 994 | 1.529 | 2.599 | 3.899 | 6.116 | 9.939 | 13.761 | 24.464 |
8,0 | 146 | 260 | 407 | 643 | 1.058 | 1.628 | 2.767 | 4.15 | 6.51 | 10.579 | 14.648 | 26.042 |
8,5 | 155 | 277 | 432 | 683 | 1.124 | 1.729 | 2.94 | 4.409 | 6.917 | 11.24 | 15.563 | 27.667 |
9,0 | 164 | 292 | 456 | 720 | 1.185 | 1.823 | 3.098 | 4.648 | 7.29 | 11.847 | 16.403 | 29.162 |
9,5 | 173 | 307 | 480 | 759 | 1.249 | 1.921 | 3.266 | 4.899 | 7.684 | 12.487 | 17.289 | 30.736 |
10,0 | 182 | 323 | 505 | 798 | 1.312 | 2.019 | 3.433 | 5.149 | 8.077 | 13.125 | 18.173 | 32.307 |
10,5 | 191 | 339 | 530 | 837 | 1.378 | 2.12 | 3.604 | 5.406 | 8.48 | 13.78 | 19.08 | 33.92 |
11,0 | 200 | 355 | 555 | 877 | 1.443 | 2.22 | 3.774 | 5.661 | 8.88 | 14.43 | 19.98 | 35.52 |
12,0 | 218 | 387 | 605 | 956 | 1.573 | 2.42 | 4.115 | 6.172 | 9.682 | 15.733 | 21.784 | 38.726 |
13,0 | 235 | 417 | 652 | 1.03 | 1.695 | 2.608 | 4.434 | 6.651 | 10.433 | 16.953 | 23.474 | 41.731 |
14,0 | 252 | 449 | 701 | 1.108 | 1.822 | 2.804 | 4.766 | 7.15 | 11.215 | 18.225 | 25.234 | 44.861 |
15,0 | 270 | 481 | 751 | 1.187 | 1.954 | 3.006 | 5.11 | 7.665 | 12.023 | 19.538 | 27.052 | 48.093 |
16,0 | 288 | 513 | 801 | 1.266 | 2.083 | 3.204 | 5.447 | 8.17 | 12.816 | 20.826 | 28.836 | 51.264 |
17,0 | 306 | 545 | 850 | 1.343 | 2.21 | 3.4 | 5.78 | 8.671 | 13.601 | 22.101 | 30.602 | 54.403 |
18,0 | 324 | 575 | 899 | 1.42 | 2.336 | 3.595 | 6.111 | 9.166 | 14.378 | 23.365 | 32.351 | 57.514 |
19,0 | 342 | 607 | 949 | 1.499 | 2.466 | 3.795 | 6.451 | 9.676 | 15.178 | 24.665 | 34.151 | 60.714 |
20,0 | 357 | 635 | 993 | 1.568 | 2.581 | 3.971 | 6.75 | 10.126 | 15.883 | 25.81 | 35.737 | 63.533 |
21,0 | 376 | 669 | 1.046 | 1.653 | 2.719 | 4.184 | 7.112 | 10.669 | 16.735 | 27.195 | 37.654 | 66.941 |
23,0 | 413 | 735 | 1.148 | 1.814 | 2.985 | 4.592 | 7.807 | 11.71 | 18.369 | 29.849 | 41.33 | 73.475 |
25,0 | 449 | 798 | 1.247 | 1.969 | 3.241 | 4.986 | 8.476 | 12.714 | 19.944 | 32.409 | 44.874 | 79.776 |
27,0 | 484 | 861 | 1.346 | 2.126 | 3.498 | 5.382 | 9.149 | 13.724 | 21.528 | 34.983 | 48.438 | 86.112 |
29,0 | 520 | 924 | 1.444 | 2.282 | 3.755 | 5.777 | 9.82 | 14.73 | 23.106 | 37.548 | 51.989 | 92.426 |
30,0 | 538 | 957 | 1.496 | 2.363 | 3.889 | 5.983 | 10.17 | 15.256 | 23.93 | 38.887 | 53.843 | 95.722 |
33,0 | 590 | 1.05 | 1.64 | 2.592 | 4.265 | 6.561 | 11.153 | 16.73 | 26.243 | 42.645 | 59.047 | 104.973 |
Kvs | 1,8 | 3,2 | 5,0 | 7,9 | 13 | 20 | 34 | 51 | 80 | 130 | 180 | 320 |
Capacity Chart
The Table 2 shows the maximum available downstream steam flow amount of the pressure reducing valve at the requested downstream pressure p₂. Pay attention that the steam pressure p₂ is shown as barg.
Table 2
P2 | Steam Flow per DN in kg/h | |||||||||||
p2 (barg) | 15 | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 |
0,1 | 16 | 29 | 45 | 73 | 115 | 179 | 303 | 460 | 715 | 1120 | 1610 | 2870 |
0,2 | 18 | 31 | 48 | 79 | 124 | 194 | 328 | 498 | 775 | 1215 | 1750 | 3110 |
0,3 | 19 | 34 | 52 | 85 | 134 | 209 | 353 | 535 | 835 | 1310 | 1880 | 3350 |
0,4 | 20 | 36 | 56 | 92 | 144 | 224 | 380 | 575 | 895 | 1405 | 2020 | 3590 |
0,5 | 22 | 39 | 60 | 99 | 154 | 239 | 405 | 615 | 955 | 1500 | 2170 | 3820 |
0,6 | 22 | 41 | 64 | 105 | 163 | 254 | 430 | 650 | 1015 | 1590 | 2290 | 4060 |
0,7 | 24 | 43 | 68 | 110 | 173 | 269 | 455 | 690 | 1075 | 1680 | 2420 | 4300 |
0,8 | 26 | 46 | 72 | 116 | 182 | 284 | 480 | 725 | 1135 | 1770 | 2550 | 4540 |
0,9 | 27 | 48 | 75 | 122 | 191 | 299 | 505 | 765 | 1195 | 1660 | 2680 | 4780 |
1,0 | 28 | 50 | 78 | 128 | 200 | 314 | 530 | 800 | 1250 | 1950 | 2820 | 5020 |
1,2 | 31 | 55 | 86 | 140 | 219 | 343 | 580 | 880 | 1360 | 2140 | 3080 | 5500 |
1,4 | 34 | 60 | 93 | 152 | 238 | 377 | 625 | 950 | 1480 | 2320 | 3350 | 5950 |
1,6 | 36 | 65 | 100 | 164 | 257 | 401 | 675 | 1025 | 1600 | 2500 | 3600 | 6420 |
1,8 | 39 | 69 | 107 | 176 | 275 | 430 | 725 | 1100 | 1720 | 2680 | 3850 | 6890 |
2,0 | 42 | 74 | 115 | 188 | 294 | 460 | 775 | 1180 | 1840 | 2870 | 4125 | 7360 |
2,5 | 48 | 84 | 132 | 217 | 338 | 530 | 890 | 1355 | 2120 | 3300 | 4750 | 8450 |
3,0 | 54 | 96 | 150 | 246 | 385 | 600 | 1010 | 1540 | 2400 | 3750 | 5400 | 9650 |
3,5 | 60 | 108 | 168 | 275 | 430 | 670 | 1130 | 1720 | 2680 | 4200 | 6050 | 10700 |
4,0 | 67 | 119 | 185 | 305 | 475 | 740 | 1250 | 1900 | 2960 | 4650 | 6650 | 11800 |
4,5 | 73 | 130 | 202 | 335 | 520 | 810 | 1370 | 2080 | 3240 | 5075 | 7300 | 13050 |
5,0 | 79 | 141 | 220 | 365 | 565 | 880 | 1490 | 2250 | 3520 | 5500 | 7900 | 14100 |
5,5 | 85 | 152 | 237 | 395 | 605 | 950 | 1600 | 2430 | 3800 | 5925 | 8500 | 15150 |
6,0 | 92 | 163 | 254 | 420 | 655 | 1020 | 1720 | 2610 | 4080 | 6350 | 9125 | 16300 |
6,5 | 98 | 174 | 271 | 445 | 695 | 1085 | 1840 | 2790 | 4360 | 6775 | 9750 | 17400 |
7,0 | 104 | 185 | 288 | 475 | 740 | 1160 | 1960 | 2970 | 4640 | 7200 | 10375 | 18500 |
7,5 | 110 | 196 | 305 | 500 | 785 | 1220 | 2070 | 3140 | 4900 | 7650 | 11000 | 19600 |
8,0 | 117 | 207 | 323 | 530 | 830 | 1290 | 2180 | 3320 | 5180 | 8100 | 11625 | 20700 |
8,5 | 123 | 218 | 341 | 560 | 875 | 1365 | 2300 | 3500 | 5450 | 8550 | 12250 | 21800 |
9,0 | 129 | 229 | 358 | 585 | 915 | 1430 | 2410 | 3670 | 5720 | 8975 | 12875 | 22900 |
9,5 | 135 | 240 | 375 | 615 | 960 | 1500 | 2530 | 3840 | 6000 | 9400 | 13500 | 24000 |
10,0 | 141 | 252 | 392 | 645 | 1000 | 1570 | 2650 | 4020 | 6270 | 9825 | 14125 | 25100 |
11,0 | 154 | 273 | 427 | 700 | 1090 | 1710 | 2880 | 4380 | 6800 | 10700 | 15300 | 27300 |
12,0 | 166 | 294 | 461 | 750 | 1180 | 1840 | 3100 | 4730 | 7300 | 11550 | 16500 | 29400 |
13,0 | 178 | 316 | 495 | 810 | 1270 | 1980 | 3340 | 5080 | 7850 | 12400 | 17750 | 31600 |
14,0 | 190 | 338 | 530 | 870 | 1355 | 2120 | 3570 | 5400 | 8400 | 13200 | 19000 | 33800 |
15,0 | 202 | 360 | 565 | 925 | 1440 | 2250 | 3800 | 5750 | 8950 | 14100 | 20300 | 36000 |
16,0 | 215 | 382 | 600 | 980 | 1530 | 2390 | 4030 | 6100 | 9550 | 15000 | 21600 | 38200 |
17,0 | 227 | 404 | 630 | 1020 | 1620 | 2530 | 4270 | 6450 | 10100 | 15900 | 22800 | 40400 |
18,0 | 240 | 427 | 665 | 1090 | 1710 | 2670 | 4500 | 6800 | 10650 | 16750 | 24000 | 42600 |
19,0 | 252 | 450 | 700 | 1145 | 1790 | 2800 | 4740 | 7150 | 11200 | 17600 | 25200 | 44800 |
20,0 | 263 | 473 | 730 | 1200 | 1870 | 2930 | 4950 | 7500 | 11750 | 18400 | 26500 | 47000 |
22,0 | 288 | 510 | 800 | 1310 | 2050 | 3200 | 5400 | 8200 | 12800 | 20000 | 28800 | 51000 |
24,0 | 312 | 555 | 870 | 1420 | 2220 | 3470 | 5850 | 8900 | 13900 | 21700 | 31200 | 55200 |
26,0 | 337 | 600 | 940 | 1530 | 2400 | 3750 | 6300 | 9600 | 15000 | 23400 | 33700 | 60400 |
28,0 | 362 | 645 | 1010 | 1650 | 2580 | 4020 | 6800 | 10300 | 16100 | 25100 | 36200 | 64600 |
30,0 | 387 | 690 | 1080 | 1770 | 2750 | 4300 | 7250 | 11000 | 17200 | 26900 | 38700 | 68800 |
32,0 | 413 | 735 | 1150 | 1890 | 2950 | 4600 | 7750 | 11800 | 18300 | 28800 | 41300 | 73500 |