WS End-of-Line Diaphragm Non-Return Valves

Diaphragm Non-Return Valves » Anti-reflux or anti-backflow valves
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Description

The WS valve is made of two pieces: an external containment shell made of AISI 304 stainless steel (or PVC or PE) containing a rubber diaphragm that blocks any possible backflow. The diaphragm opens when pushed by the upstream water, and as soon as this push ceases, the valve remains normally closed: the greater the push from downstream, the more the valve adheres to the walls to prevent backflow. WS series valves can be mounted both horizontally and vertically. The valve is highly adaptable and can be mounted on almost any pipe. The WS valve is available in sizes from DN75mm to DN1500mm.

Specification Item

Supply of a WS rubber backflow preventer valve of the fluid-actuated type to be inserted inside a pipeline having Di……… mm; the flexible body must be constructed from a single piece of rubber contained within an AISI 304 stainless steel shell. Hydraulic seal 5m H2O

WS model to be inserted into the existing pipe – Price list 2025

 

DN AISI shell outer shell diameter mm Lmm minimum internal tube diameter mm out of water* submerged in water* vertical application* flow rate* max l/s.  article PRICE Euro
opening

H20 mm membrane

 chiusura

H20 mm membrane

 opening

H20 mm membrane

 chiusura

H20 mm membrane

 opening

H20 mm membrane

 chiusura

H20 mm membrane
75 PVC 75 130 75 250 104 150 61 226 61 9 WS75PVC 620,00
110 PVC 110 210 110 185 71 155 20 249 89 19 WS110PVC 810,00
125 PVC 125 240 125 206 84 140 15 231 120 19 WS125PVC 850,00
160 PVC 160 310 160 226 87 180 26 264 140 40 WS160PVC 1120,00
200 PVC 200 400 200 236 122 170 36 295 180 63 WS200PVC 1680,00
250 HDPE 250 480 250 200 115 165 46 285 170 64 WS250PE 2560,00
315 HDPE 315 600 315 218 132 145 46 335 196 198 WS315PE 3800,00
 
100 316 97 210 100 190 70 145 20 220 80 16 W.S.97 1420,00
110 316 101 215 104 205 70 155 20 250 90 20 W.S.101 1460,00
125 316 116 235 119 295 85 200 25 255 135 26 W.S.116 1500,00
150 316 146 300 149 235 80 175 25 350 120 36 W.S.146 1600,00
200 316 183 385 185 290 100 200 35 315 285 64 W.S.183 3280,00
200 316 193 395 196 245 120 170 35 295 180 64 W.S.193 3500,00
225 316 215 450 220 190 114 160 45 255 185 80 W.S.215 3960,00
250 316 230 480 235 200 126 135 40 320 185 100 W.S.230 4250,00
250 316 240 495 245 200 112 125 35 320 200 100 W.S.240 4560,00
280 316 265 550 270 180 120 145 35 320 200 115 W.S.265 5910,00
300 316 283 600 288 220 110 130 40 330 190 200 W.S.283 5910,00
300 316 290 600 298 237 162 145 45 335 195 214 W.S.290 5910,00
350 316 340 700 345 325 195 205 60 350 205 290 W.S.340 8220,00
370 316 370 730 375 232 160 140 45 360 210 378 W.S.370 10040,00
400 316 390 750 395 335 208 210 55 420 290 378 W.S.390 10860,00
450 304 440 840 448 220 145 145 45 385 230 478 W.S.440 11500,00
500 304 490 900 495 270 180 185 55 400 240 786 W.S.490 13800,00
515 304 515 1000 520 265 165 180 50 400 240 830 W.S.515 14400,00
600 304 590 1140 600 355 245 235 75 425 255 1132 W.S.590 16000,00
700 304 690 1300 696 250 155 160 45 450 275 1540 W.S.690 22400,00
750 304 750 1400 762 345 225 215 70 470 200 1768 W.S.750 23500,00
800 304 790 1500 802 340 230 210 70 480 290 2012 W.S.790 24200,00
900 304 885 1700 897 410 270 245 80 505 305 2546 W.S.885 29000,00
1000 304 985 1800 997 405 265 235 80 450 270 3142 W.S.985 39000,00
1100 304 1040 2000 1052 350 220 265 90 605 375 3464 W.S.1040 50200,00
1200 304 1185 2250 1197 440 285 265 95 660 410 5656 W.S.1185 67500,00
1400 304 1385 2600 1397 540 345 270 105 685 430 7698 W.S.1385 96100,00
1500 304 1485 2800 1497 630 385 300 115 715 445 8836 W.S.1485 124000,00
1600 304 1585 3000 1597 510 315 235 95 800 520 10054 W.S.1585 145000,00
1800 304 1785 3100 1797 655 420 275 125 850 530 12724 W.S.1785 par

Fields of Application

This type of backflow preventer valve is designed to prevent water from flowing back into a piped system leading to a basin, tank, or sea without the need for power or maintenance. Their absolute silence and minimal pressure drop have made this type of valve increasingly popular, and they are widely used in both industry and public and private projects. The valves discharge with minimal hydraulic pressure (just a few centimeters) and also prevent gases from rising. They are an excellent deterrent against animals entering the pipes.

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