Check Valves for District Heating & Cooling Systems
WCB gate and EPDM butterfly valves for district heating and cooling networks - hot water up to 180°C, chilled water, and brine coolant service per EN 13480 and EN 488 pre-insulated pipe standards.
Which check valves are used for district heating & cooling systems?
District energy networks - district heating (DH) distributing hot water at 70–120°C, district cooling (DC) circulating chilled water at 5–12°C, and high-temperature networks at 150–180°C - require valves designed for continuous unattended service, minimal pressure drop (network efficiency is critical), and compatibility with pre-insulated buried piping systems. European DH networks follow EN 13480 (metallic industrial piping) and EN 488 (pre-insulated bonded pipe assemblies). Vajra supplies WCB and ductile iron gate and butterfly valves for DH, and SS316L for high-temperature or glycol-containing networks, with full pressure testing documentation.
Check Valve (DH Circulation Pump)
District heating and cooling pump discharge back-flow prevention; prevents reverse rotation on pump trip
Critical Requirements
- PED 2014/68/EU compliance mandatory for European district heating networks above 0.5 bar - CE marking with Category I/II/III depending on fluid group and size
- EPDM seats rated for continuous 120°C service - standard NBR seats degrade above 80°C in district heating
- Buried valve design - extension stems (500–2,000 mm) for underground installation; stem seal must prevent groundwater ingress
- Low-pressure-drop design - gate or butterfly valves only; no globe valves on DH mains (excess pressure drop increases pumping energy cost)
- Pre-insulated pipe compatibility - valve jackets or in-situ foam insulation of buried valves must maintain thermal integrity per EN 488
- District cooling glycol service - EPDM or PTFE seats only for ethylene glycol or propylene glycol solutions
Service Challenges
- District heating water (70–120°C, treated, minimal oxygen) - standard WCB gates and ductile iron butterfly valves work well; oxygen scavenging treatment prevents internal corrosion
- High-temperature DH water (150–180°C, sealed closed systems) - above 120°C EPDM degrades; graphite packing and SS316L or WCB with Stellite trim
- Chilled water (5–12°C) - condensation on valve exterior in warm/humid environments; insulation jacket required
- Glycol-water (30–50% glycol for frost protection) - EPDM compatible; avoid PTFE compression fittings for buried service
- Geothermal district heating - often contains dissolved H₂S, CO₂, and scale; SS316L or Duplex 2205 required (similar to geothermal power)
Vajra Check Valves
Non-return valves to prevent backflow and protect equipment in piping systems.
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Check Valves for other applications
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