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Double & Single Non-Return Valves

A double and single non-return valve of Reflux design. Designed and manufactured in the United Kingdom using WRAS approved materials.

This valve is spring loaded, axially guided with a resilient sealing mechanism and will operate in any position.Water Services maintain a policy of continual product development and as such reserves the right to vary in detail. 

Double Check Valve

Size Bore
mm		 Length
mm		 Diameter
mm 		Weight
kgs
DN 50 50 205 165 17
DN 65 65 245 185 18.5
DN 80 80 265 200 20
DN 100 100 315 220 30
DN 125 125 405 250 40
DN 150 150 465 285 60
DN 200 200 565 340 100
DN 250 250 693 405 188
DN 300 300 775 460 280
DN 350 350 925 520 450

Single Check Valve

Size Bore
mm		 Length
mm		 Diameter
mm 		Weight
kgs
DN 50 50 100 165 8.5
DN 65 65 120 185  9.25
DN 80 80 130 200 10
DN 100 100 155 220 15
DN 125 125 200 250 20
DN 150 150 230 285 30
DN 200 200 280 340 50
DN 250 250 344 405 94
DN 300 300 385 460 140
DN 350 350 460 520 225

Foot Valve

Size Bore
mm		 Length
mm		 Diameter
mm 		Weight
kgs
DN 50 50 210 190 8.5
DN 80 65 227 200  10
DN 100 80 271 220 15
DN 150 100 402 285 30
DN 200 125 490 340 50
DN 250 150 602 405 94
DN 300 200 674 460 140
DN 350 250 805 520 225
Materials Specifications
1. Body SG Iron 420/12
2. Plunger SG Iron 420/12 
3. Ring SG Iron 420/12
4. Seat Nitrile 70 Shore
5. Guide Gun Metal Grade LG2
6. Spring Stainless Steel Grade 304 S26
7. Studs Mild Steel (Plated)
8. Gasket Nitrile 70 Shore
9. Test Plug DZR Brass

Single & Double Check Valves

WHERE TO USE WATER SERVICES VALVES

Available with compression or BSP parallel female ends, Water Services valves help eliminate the risk of contamination through backflow in a wide range of central heating and water service installations.

Single check valves can, for example, be used to prevent backflow in central heating systems, to protect the mains water supply during the regeneration cycle of water softeners or be installed downstream of water meters to protect upstream mains from backflow.

Water Services double check valves are suitable for ensuring the filling of primary heating circuits meets the requirements of Water Byelaw 14.

Double check valves are advisable where a hose is connected to a hose union bib tap and should be installed as close to the tap as possible.

Water Services evolved from working directly with many of the UK’s largest water authorities.

We are currently in partnership with:

Even if you are working outside these areas please give us a call as we work alongside 98% of the UK’s water authorities.

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Our Water Partners