Data center cooling valves should be selected by their job in the piping system, not by a single list of valve types. A chilled-water header may need reliable isolation; a CRAH coil needs stable flow control; a pump discharge may require backflow protection; and a CDU facility-water connection may need isolation, filtration and control matched to the CDU manufacturer’s requirements. Confirm the operating fluid, flow, pressure, allowable pressure loss and maintenance arrangement before choosing a valve.
If you already have a P&ID or valve schedule, send it to NORITE with the cooling medium and design conditions. We can review the valve positions and prepare a project-specific quotation.
Where are valves used in a data center cooling system?
The following table is a selection starting point, not a universal piping layout. Equipment specifications and the engineer’s P&ID determine the final arrangement.
| System location | Main valve task | Candidate valve or component | Key question before specifying |
|---|---|---|---|
| Chiller, cooling tower and condenser-water connections | Isolate equipment for service | Butterfly or other appropriately rated isolation valve | Does the water treatment, debris load or installation environment change the material and seal requirements? |
| Chilled-water main and distribution branches | Isolate sections and enable planned maintenance | Flanged, wafer or other project-approved butterfly valve | Can the selected connection, seat and actuator meet the line’s shutoff and service requirements? |
| Pump discharge | Prevent reverse flow when a pump stops | Check valve selected for flow, orientation and transient behavior | Is the closing response suitable for the actual pump and piping system? |
| CRAH or fan-wall cooling coil branch | Regulate coil flow as cooling demand changes | Project-specified modulating control valve or pressure-independent control valve (PICV) | What are the available differential-pressure range, design flow and controls sequence? |
| CDU facility-water side | Connect, isolate and protect the CDU interface | Isolation valves; strainer or filter and control valve if required by the CDU design | What does the selected CDU manufacturer require for fluid quality, pressure loss and service access? |
A butterfly valve selected for header isolation should not automatically be used as the coil’s precision modulating valve. Likewise, a check valve’s nominal size alone does not establish whether it will close appropriately during a pump trip. Match the function to the design conditions and verify the exact product data.
1. Select isolation valves for the cooling plant and water distribution
Isolation valves allow a chiller, heat exchanger, pump or pipe section to be serviced without treating every valve as a control device. For larger chilled-water or condenser-water lines, butterfly valves may offer a compact arrangement. NORITE lists D341X flanged butterfly valves for HVAC and chilled-water applications and also offers other data center valve options. The correct model still depends on the submitted duty.
Check these points before requesting a price:
- Connection and size: Nominal DN/NPS, actual pipe and flange standard, face-to-face requirements, disc clearance and available operating space. A matching nominal pressure designation does not by itself confirm flange compatibility.
- Pressure and shutoff: Maximum and minimum operating pressures, design pressure, differential pressure at closure, required seat leakage criterion and any dead-end service requirement.
- Media and materials: Treated water, condenser water or water-glycol mixture; concentration, temperature range, corrosion control and compatibility of the body, disc, coating and seat.
- Operation: Manual, gear or electric actuation; local indication, command and feedback signals; opening/closing time; and any defined response to power or control loss.
- Serviceability: Access for actuator removal, insulation, drainage, pipe support and replacement of the valve or adjacent equipment.
Do not assume that a seat material is suitable for every glycol formulation or chemical treatment. Request the selected valve’s material and temperature limits against the project’s actual fluid specification.
2. Treat pump protection and filtration as separate decisions
A pump-discharge check valve can limit reverse flow, but its closing behavior and pressure loss must be assessed for the operating range and possible pump-stop transients. NORITE’s H76X wafer check valve is one available product family; confirm installation orientation, minimum and maximum flow, flange interface and the required closing performance for the project. If water hammer is a concern, review the pump and piping transient analysis rather than assuming that a valve name alone solves it.
A strainer can protect a control valve, heat exchanger or other sensitive component from debris. Its screen opening and clean-to-dirty pressure loss affect the system. A finer screen is not automatically better: it can add resistance and require more frequent cleaning. NORITE provides a GL41H Y-type filter and separate guidance on strainer pressure drop and clogging. Specify the protected component, required particle retention, design flow, allowable differential pressure and a safe way to isolate and clean the strainer.
Have a cooling-loop valve schedule? Request a coordinated quotation for isolation, check and filtration positions. Include your P&ID so each item can be checked against its actual duty.
3. Specify CRAH branch control from the coil duty
At a CRAH or fan-wall coil, the procurement question is not simply “Which valve fits this pipe?” The valve and actuator must deliver the required flow response over the available differential-pressure range and work with the control sequence. A design may call for a conventional modulating valve with a separate balancing arrangement, or a PICV where its operating range and control requirements suit the branch. Do not substitute one arrangement for another without checking the engineer’s specification.
For the RFQ, provide design and minimum flow, coil pressure drop, available differential pressure across the control assembly, water or glycol data, shutoff requirement, actuator power, control input, position feedback and any BMS protocol requirement. Request a product-specific flow range, operating differential-pressure range and control documentation. NORITE’s Data Center Valves page lists balancing, PICV and control-valve categories; confirm the specific model and supporting datasheet before stating that it meets your coil schedule.
4. Define the CDU boundary before choosing valves
In a liquid-to-liquid CDU arrangement, the facility water system (FWS) supplies the facility side of the CDU, while the technology cooling system (TCS) serves the IT-side cooling loop. These sides can have different fluid-quality and operating requirements. Open Compute Project materials describe the CDU as an interface that separates the facility and IT cooling loops; its CDU work also addresses integration with facility systems. Read the OCP CDU project overview.
For valves outside the CDU on the facility-water connection, identify supply and return isolation points, the manufacturer’s required filtration or strainer arrangement, any specified control-valve location, instrumentation and access for maintenance. Record the clean and service-limit pressure drops across the protective component. Refer to the chosen CDU installation manual and approved P&ID for the final order and location of components.
Do not carry a generic Y-strainer screen size into the TCS or rack manifold. IT-side filtration and fluid cleanliness are separate equipment-specific requirements. NORITE’s facility-side valve and piping options should be quoted against the CDU manufacturer’s connection schedule, not presented as a certified rack-side cooling package without supporting product evidence.
Data center cooling valve RFQ checklist
Send one schedule per valve position. This reduces revisions caused by missing connection or operating details.
| Information to provide | Why it matters |
|---|---|
| P&ID, equipment tag and valve function | Establishes whether the item isolates, controls, balances, prevents reverse flow or protects equipment |
| System location | Distinguishes condenser water, chilled water, CRAH branch and CDU facility-water duties |
| Design, minimum and maximum flow | Supports valve sizing and checks performance outside the design point |
| Fluid, glycol concentration, treatment and temperature range | Allows material, seal and coating compatibility checks |
| Design pressure, operating pressure and available differential pressure | Establishes pressure suitability and control-valve operating conditions |
| Allowable pressure loss and filtration requirement | Supports pump-head and strainer selection |
| DN/NPS, pipe material, flange or end-connection standard | Prevents interface and installation mismatches |
| Shutoff criterion and operating frequency | Defines the required closure and durability evidence |
| Actuator power, control signal, feedback and fail action | Allows controls and BMS interface review |
| Quantity, destination, delivery schedule and required documents | Enables a usable commercial and technical offer |
Ask for a model-specific dimensional drawing, material list, pressure and temperature ratings, applicable test report and actuator or controls datasheet where relevant. For flange or pressure-class questions, see NORITE’s guide to PN10, PN16, PN25 and Class 150 ratings; the selected flange standard and drilling must still be checked independently.
Frequently asked questions
What valves are commonly specified for data center cooling?
Depending on the system, a schedule may include isolation butterfly valves, check valves, coil control or balancing valves, and strainers or filters. Their use depends on the P&ID and equipment requirements; no single valve package fits every data center.
Can the same butterfly valve be used for chilled water and condenser water?
Possibly, but only after checking the distinct fluid treatment, debris risk, temperature, corrosion exposure, pressure, sealing and connection requirements of both positions. Confirm suitability for each duty on the specific model datasheet.
Does a CDU always need a Y strainer at its inlet?
No universal arrangement applies. Follow the CDU manufacturer’s facility-water quality, filtration and pressure-loss requirements, plus the project P&ID. Also confirm isolation and access for service.
Is a PICV necessary on every CRAH coil?
No. Selection depends on the hydraulic design, differential-pressure variation, control sequence and coil schedule. A conventional control-and-balancing arrangement may also be specified. Verify the selected valve’s operating range and project requirements.
Request a valve schedule review
The fastest route to an accurate offer is to identify where each valve sits and what it must do. Contact NORITE with your P&ID, valve list, design flows, fluid data, pressure conditions, end connections, controls requirements and delivery location. We can review the applicable data center valve range and respond with model-specific specifications and a quotation for the positions we can supply.
Technical references: Open Compute Project CDU Sub-Project; OCP Liquid-to-Liquid CDU Test Methodology; U.S. Department of Energy, Best Practices Guide for Energy-Efficient Data Center Design. These references inform the system distinctions above; product suitability is determined from the selected equipment and project documentation.
