Butterfly, control, gate and check valves for chilled water, condenser water, glycol loops and district cooling networks, with the materials, standards and documentation these projects specify.
Request a Quote →A cooling system is a set of loops, each with its own valve duties. At the centre are the chillers or, in a district cooling plant, the central refrigeration machines and thermal storage. Around them run the condenser water loop to cooling towers or seawater exchangers, the chilled water loop to the building or district network, and the branches to air handling units, fan coil units and computer room air handlers.
Chiller and pump isolation valves let one machine be taken out without draining the plant. Regulating valves at each branch let the commissioning engineer set design flow. Control valves modulate coil circuits from a temperature signal, and check valves protect pumps from reverse flow when a machine stops. What makes the duty demanding is the cycle count and the service life expected, because a leaking isolation valve can force equipment offline.
| Valve Type | Typical Duty in HVAC, District Cooling & Data Centre Loops |
|---|---|
| Wafer and lug butterfly valve | The default isolation valve on chilled water, condenser water and branch lines. Compact, low weight and low pressure drop. |
| Double-flanged butterfly valve | Large headers, plant room mains and district cooling network lines where the valve must carry pipe loads. |
| Electric actuated butterfly valve | Motorised isolation and on/off control in plant rooms and networks monitored from a building management system. |
| Pneumatic actuated butterfly valve | Fast open/close isolation where a spring-return failsafe position is required, for example on a chiller that must not be left open on control-air failure. |
| Control valve | Modulating flow to air handling units, fan coil units and heat exchangers from a temperature signal, selected on Cv and circuit authority. |
| Gate valve | Full-bore isolation on pump discharge, make-up water and tower lines where an unobstructed passage is wanted. |
| Check valve | Pump discharge and multiple-pump headers, preventing reverse flow through a stopped machine and limiting water hammer on changeover. |
| Globe and triple-offset butterfly valve | Globe valves for regulating duty on smaller branches; triple-offset valves where a metal seat and tighter leakage class are wanted on larger lines. |
The medium in a cooling loop is treated water, so the material question is mainly corrosion protection and elastomer compatibility rather than exotic alloys. Ductile iron with an epoxy coating is the working body material for most HVAC and district cooling valves. Stainless steel discs and stems are common where the water is aggressive or the loop is open to atmosphere.
Chilled water does not attack a properly coated body. Problems come from untreated water in a closed loop, which can turn acidic or support microbiological growth, and from open condenser circuits carrying chlorides and suspended solids. Glycol loops should be specified with the glycol type and concentration, because the inhibitor package affects elastomer life. EPDM is the usual seat material, but the fluid should be stated so the elastomer can be confirmed against it. The epoxy coating specification, dry film thickness and cure belong in the purchase document, and where condensation forms, external protection on the stem and actuator housing matters as much as the internal coating.
HVAC and district cooling projects are specified by consulting engineers, so the standard set mixes American, European and local codes. These are standards projects specify to suppliers, not standing approvals held by us.
| Standard | What It Covers in This Sector |
|---|---|
| API 609 | Butterfly valve design, face-to-face dimensions and pressure-temperature ratings, frequently referenced for plant room isolation valves. |
| API 598 | Shell and seat pressure testing, defining test pressures, durations and permissible leakage so acceptance is objective. |
| ISO 5211 | Actuator mounting flange dimensions, the interface that allows a replacement actuator to be fitted without an adapter. |
| IEC 60534 | Control valve sizing, used to establish Cv and check that the valve has adequate authority in the coil circuit. |
| ISO 5752 / EN 558 | Face-to-face dimensions for flanged valves, so a replacement matches the pipe spool already fabricated. |
| EN 1092 / ASME B16.5 | Flange drilling and dimensions. Mixing the two on one project is a common and avoidable source of installation delay. |
| WRAS / NSF/ANSI 61 | Material-in-contact-with-water approvals that some projects specify for potable or make-up water connections. Where stated, raise them at enquiry stage. |
On a cooling project the documentation serves two audiences. The contractor needs records proving the valves were tested and match the approved submittal, and the facilities team needs information to file against each valve tag for the life of the building.
At the works, the standard evidence is a mill test certificate to EN 10204 3.1 covering body, disc, stem and seat materials, each traceable to its heat number; shell and seat hydrostatic test reports to API 598; and dimensional inspection records confirming face-to-face length, flange drilling and the actuator mounting flange. Where the body is epoxy coated, the coating specification and dry film thickness record are requested with the material certificate.
Where actuation is supplied, the actuator nameplate data, mounting interface confirmation and a function test record covering open, close and any failsafe action are added. For control valves, the sizing calculation and characterised flow data form part of the submittal, so the approving engineer can see that the required Cv has been met in the actual circuit. Our quality system is certified to ISO 9001, and factory audit reports from SGS-CSTC are available on request. Product approvals that individual projects specify — among them WRAS, NSF/ANSI 61, ATEX or PED documentation — are project requirements rather than standing certifications, and can be provided on request for qualified orders. See our certifications page for the full detail.
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EPDM is the usual choice for chilled water and condenser water because it tolerates the temperature range and resists the treated water chemistry found in closed loops. Where the loop contains glycol for freeze protection, the glycol type and concentration should be stated, because inhibitor packages interact with elastomers differently from plain water.
Most building services specifications require actuator mounting to ISO 5211 so a failed actuator can be replaced from local stock without an adapter plate. Standardising the mounting interface and stem square across a project reduces spares inventory and shortens downtime.
Typical requests are a mill test certificate to EN 10204 3.1 traceable to the heat number, shell and seat pressure test reports to API 598, dimensional inspection records confirming face-to-face and flange drilling, and the elastomer and epoxy coating specifications. Where valves are actuated, the function test record is requested as well.
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Give us the loop, size, pressure rating, medium including glycol type and concentration, and whether the valve is manual or actuated. We will reply with a selection and the documentation we can provide.
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