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Fakai Valve Factory Site: Yongxing Industrial Zone, Longwan District, Wenzhou City Tel: 0577-88767789
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H76H / W Wafer Double-lobe Swing Check Valve

H76H / W Wafer Double Swing Check Valve Structure
H76H / W Wafer Double Swing Check Valve Structure

H76H / W double-closing swing check valve is suitable for nominal pressure PN1.0MPa ~ 42.0MPa, Class150 ~ 2500, nominal diameter DN15 ~ 1200mm, NPs1 / 2—48, working temperature -196 ~ 540 ℃ This kind of pipeline is used to prevent the medium from flowing backward. By using different materials, it can be applied to various media such as water, steam, oil, nitric acid, strong oxidizing media and urea.

Structural features

1. The structure length is short, and the structure length is only 1/4 to 1/8 of the traditional flange check valve;
2. Small size and light weight, its weight is only 1/4 ~ 1/20 of traditional flange check valve;
3. The valve flap closes quickly and the water hammer pressure is small;
4. Both horizontal and vertical pipes can be used, which is easy to install;
5.The flow channel is unobstructed and the fluid resistance is small;
6, sensitive action, good sealing performance;
7. The valve flap has a short stroke and a small impact force when closing the valve;
8, the overall structure, simple and compact, beautiful appearance;
9. Long service life and high reliability.

Comparison of H76 and H44 Swing Check Valves

structure type H76 Wafer type double flap swing check valve H44 flange single flap swing check valve
Water hammer pressure Water, short valve stroke, spring assisted closing, fast valve closing speed Large, long disc travel, requiring long closing times
H76 type water hammer pressure is only 1/2 ~ 1/5 of H44 type
size and weight The structure is short in length, small in size and light in weight.
Bring great convenience to valve installation, handling, storage and piping arrangement, and can save a lot of materials and reduce cost
The structure is very long, bulky and heavy
The structure length of the H76 type is only 1/4 to 1/6 of the H44 type, and the weight of the H76 type is only 1/4 to 1/10 of the H44 type.
Fluid resistance The fluid resistance coefficient ξ is 2.6 to 0.7.
As the valve diameter increases, the coefficient of fluid resistance decreases.
Small, fluid resistance coefficient ξ is 1.3 ~ 3,
However, under low pressure conditions, the valve flap cannot be fully opened and the fluid resistance is large.
The fluid resistance increases with the valve size.
installation Can be installed horizontally or vertically, light weight, no need to set a support for the valve. Can be installed horizontally or vertically,
Large-caliber valves are heavy and require support
Opening pressure Very small, the disc can open completely with a small pressure difference Larger, the valve flap can be fully opened under a large pressure difference
reliability The valve has an overall structure, which is simple and compact.
When the valve is closed, the impact force is small, the water hammer pressure is small, the valve has a long life and high reliability.
The huge impact force and water hammer pressure when the valve is closed easily damage the valve

Performance parameter

Nominal pressure PN1.0MPa, PN1.6MPa, PN2.5MPa, PN4.0MPa, PN6.4MPa, PN10.0MPa
model H76H-C H76W-P H76W-P8 H76W-P3 H76W-R H76W-R8 H76W-R3
Material of main parts Valve body WCB (A105) ZG1Cr18Ni9Ti CF8 (304) CF8 (304L) ZG1Cr18Ni12Mo2Ti CF8M (316) CF3M (316L)
Disc CF8 CF8 CF8 CF3 CF8M CF8M CF3M
Valve shaft 2Cr13 1Cr18Ni9Ti 0Cr18Ni9 00Cr19Ni10 1Cr18Ni12Mo2Ti 0Cr17Ni12Mo2 00Cr17Ni14Mo2
spring 0Cr18Ni9 0Cr18Ni9 0Cr18Ni9 00Cr19Ni10 0Cr17Ni12Mo2 0Cr17Ni12Mo2 00Cr17Ni14Mo2
Be applicable

Working condition
Applicable medium water,
steam,
Oil products, etc.
Corrosive media such as nitric acid Strongly oxidizing medium Corrosive media such as acetic acid Corrosive media such as urea
Applicable temperature (℃) -29 ~ 425 -196 ~ 540 -196 ~ 425 -196 ~ 540 -196 ~ 455

Hydromechanical properties (fluid resistance coefficient, flow coefficient and opening pressure)

Nominal diameter Coefficient of fluid resistance when valve is fully open Water flow coefficient when the valve is fully open at room temperature Fluid flow
DN DNS
Kv (m3 / h) CV (US) CV (UK)
Approximate opening pressure KPa
50 5 2.6 63 74 62 2 1
65 2-1 / 2 2.4 109 128 107 2 1
80 3 2.3 172 201 169 2 1
100 4 2.0 289 338 283 2 1
125 5 1.8 476 557 466 2 1
150 6 1.5 750 878 735 2 1
200 8 1.3 1432 1675 1403 2 1
250 10 1.2 1330 2726 2283 2 1
300 12 1.0 3676 4301 3602 2 1
350 14 0.9 5274 6171 5169 2 1
400 16 0.8 7306 8548 7160 3 1
450 18 0.8 9246 10818 9061 3 1
500 20 0.8 11415 13356 11187 3 1
600 twenty four 0.7 17573 20560 17222 3 1
700 28 0.7 23919 27985 23441 4 1
750 30 0.7 27458 32126 26909 4 1
800 32 0.7 31241 36552 30316 4 1
900 36 0.7 39539 46261 38748 4 1
1000 40 0.7 48814 57112 47838 4 1
1050 42 0.7 53817 62966 52741 4 1
1200 48 0.7 70292 82242 68886 4 1

Dimension table

Pressure level caliber Size (mm) Weight (kg)

Piping flange (for reference)

NPS DN L D D 3 D 2 Bolt hole center circle diameter D 1 Number of bolts Bolt diameter d Bolt length L 1
in mm RF RJ
Class 150
PN2.0MPa
2 50 60 103 56 51 2 120.5 4 5/8 M16 140 155
2-1 / 2 65 67 122 73 65 3 139.5 4 5/8 M16 150 165
3 80 73 135 88 80 4 152.5 4 5/8 M16 160 175
4 100 73 173 108 102 6 190.5 8 5/8 M16 170 185
5 125 86 195 132 127 8 216.0 8 3/4 M20 190 205
6 150 98 220 160 152 13 241.5 8 3/4 M20 205 220
8 200 127 277 210 203 25 298.5 8 3/4 M20 240 255
10 250 146 337 266 254 39 362.0 12 7/8 M24 270 285
12 300 181 407 310 305 54 432.0 12 7/8 M24 310 325
14 350 184 448 355 350 80 476.0 12 1 M27 325 340
16 400 191 512 405 400 117 540.0 16 1 M27 340 355
18 450 203 547 455 450 138 578.0 16 1-1 / 8 M30 365 380
20 500 219 604 505 500 163 635.0 20 1-1 / 8 M30 385 400
twenty four 600 222 715 605 600 331 749.5 20 1-1 / 4 M33 405 420
28 700 305 773 700 700 380 795.5 40 3/4 M20 455 -
30 750 305 824 750 746 425 846.0 44 3/4 M20 455 -
32 800 305 878 800 796 560 900.0 48 3/4 M20 460 -
36 900 368 983 910 898 640 1009.5 44 7/8 M24 540 -
42 1050 432 1142 1055 1050 960 1171.5 48 1 M27 625 -
48 1200 524 1302 1205 1200 1400 1335.0 44 1-1 / 8 M30 740 -
Class 300
PN5.0MPa
2 50 60 110 58 51 3 127.0 8 5/8 M16 155 175
2-1 / 2 65 67 128 73 65 4 149.0 8 3/4 M20 175 195
3 80 73 147 88 80 6 168.5 8 3/4 M20 190 210
4 100 73 179 108 102 8 200.0 8 3/4 M20 195 215
5 125 86 214 132 127 15 235.0 8 3/4 M20 215 235
6 150 98 249 160 152 18 270.0 12 3/4 M20 230 250
8 200 127 305 210 203 31 330.0 12 7/8 M24 280 300
10 250 146 359 266 254 51 387.5 16 1 M27 315 335
12 300 181 420 310 305 77 451.0 16 1-1 / 8 M30 365 385
14 350 222 483 355 350 117 514.5 20 1-1 / 8 M30 410 430
16 400 232 537 405 400 190 571.5 20 1-1 / 4 M33 435 455
18 450 264 594 455 450 200 628.5 twenty four 1-1 / 4 M33 475 535
20 500 292 652 505 500 265 686.0 twenty four 1-1 / 4 M33 510 585
twenty four 600 318 772 608 600 410 813.0 twenty four 1-1 / 2 M39 560 -
30 750 368 882 740 735 660 921.0 36 1-3 / 8 M36 650 -
36 900 483 1044 880 873 1020 1089.0 32 1-5 / 8 M42 800 -
42 1050 568 1196 1045 1035 1540 1244.5 36 1-3 / 4 M45 920 -
48 1200 629 1365 1190 1179 2260 1416.0 40 1-7 / 8 M48 1010 -