Establish the design condition before selecting a product
Start with medium, concentration, supply and return temperature, design and minimum flow, available differential pressure, pipe size and pressure class. A control valve also needs an authority, characteristic and rangeability check; an isolation valve emphasizes shutoff, leakage and pressure duty. Matching valve and pipe size by default can produce poor low-load resolution or unreasonable pressure loss.
- Record normal, minimum, maximum and abnormal cases rather than one design point.
- Identify water, glycol mixture or other media and verify seal and material compatibility.
- Treat noise, cavitation, erosion, condensation and exposed or wet locations as design checks.
The actuator must satisfy torque, speed and fail strategy
An actuator is not an accessory chosen after the valve. Match it to required valve torque at maximum design differential pressure, manufacturer safety factors, running time, modulation frequency, power, signal, feedback, manual operation and fail-safe intent. Spring return, fast action and fail-in-place represent different risk strategies.
- Confirm on/off, three-point or modulating control and the actual 0–10 V, 4–20 mA or bus interface.
- Include ingress rating, temperature, humidity, condensation, hazardous area and electrical approvals.
- Verify bracket, shaft coupling, rotation, mechanical stops and service clearance.
Turn the controls boundary into a point list and sequence
Mechanical design owns hydraulic duty and valve intent; controls design owns commands, feedback, alarms, interlocks and sequence; electrical design owns power and protection; BMS or the cooling platform owns trending, setpoints and operational visibility. A device protocol does not by itself complete the field network, point mapping, cybersecurity or sequence.
Verify from data sheet to field response
Retain the selection record, approved data sheet, valve-actuator pairing, control point list, installation orientation, position and command checks, full-stroke test, fail-state test and commissioning baseline. Reassess the operating range when balancing, pump differential pressure or sequence changes.
Combined valve and actuator selection matrix
This matrix organizes review inputs; it does not replace manufacturer tools or project engineering.
| Decision layer | Required inputs | Required output | Common error |
|---|---|---|---|
| System and hydraulics | Medium, temperature, design/minimum flow, available differential pressure, pipe size and pressure class | Valve type, size, Cv/Kvs, pressure loss and operating range | Matching pipe size and ignoring authority or low-load control |
| Valve body | Shutoff differential pressure, leakage, connection, materials, installation and access | Data sheet, permitted duty, orientation and required torque | Mixing isolation and modulation assumptions |
| Actuator | Required torque, speed, frequency, power, fail state and environment | Rated torque and margin, running time, ingress rating and return method | Checking nameplate torque but not differential pressure or coupling |
| Controls and integration | Command, feedback, alarm, protocol, points, sequence and network boundary | I/O or bus map, sequence, fault matrix and trend points | Assuming protocol support means end-to-end interoperability |
| Commissioning and operations | Flush status, balance data, pump strategy, setpoints and test scenarios | Stroke, position, flow response, fail state and operating baseline | Testing movement without confirming direction or system response |
Confirm GRUNER pairings, options and approvals against the project data sheet and the latest manufacturer edition.
Reviewable selection and delivery flow
Freeze inputs and ownership at each step to avoid changing torque, power or interfaces after delivery.
- 01
Freeze duty
Collect medium, temperature, flow, differential pressure, network and control objectives with source and open items.
Output: design-duty sheet and assumption register - 02
Select as a pair
Check valve size, characteristic, shutoff and materials, then actuator torque, speed and fail strategy.
Output: selection record and valve-actuator pairing - 03
Freeze interfaces
Confirm power, signal, feedback, protocol, address, points, sequence and mechanical coupling.
Output: approved data sheet, point list and interface register - 04
Commission and baseline
Verify full stroke, direction, feedback, fail state and system response and record final settings.
Output: functional tests, trends and operations baseline
EVIDENCE
Current evidence: product data is verifiable; project results are pending
The supplied GRUNER brochures and valve and 910/920/930 series data sheets verify product scope and selection fields. No publishable data center cooling case currently includes site duty, delivery scope and acceptance result.
- Material supplied
- Butterfly valve, actuator, HVAC and VAV documents
- Verifiable content
- Product range, data fields, options and manufacturer statements
- Missing case fields
- Client permission, duty, quantity, responsibility, commissioning and result
The material can verify capability and structure project inputs. It cannot establish actual energy savings, flow stability or KIRIAST delivery at a data center.
A manufacturer data sheet is not an as-built or performance record. Publication still needs an authorized named or anonymized case.
The current verifiable result is a reviewable selection method; no public project-performance result is available.
Frequently asked questions
Should valve size always match pipe size?
No. A control valve should be sized from flow, available differential pressure, authority, noise and control range. The designer checks reducers and velocity limits.
Is an actuator adequate if rated torque exceeds valve torque?
Not yet. Confirm how required torque was defined, maximum differential pressure, temperature, ageing or fouling effects, manufacturer margin, coupling and fail-safe action.
Can a bus protocol remove every hardwired point?
Not necessarily. Critical interlocks, fail safety, network availability, update rate, cybersecurity and project standards determine which points use the bus and which remain hardwired.
Can a retrofit keep the old valve and replace only the actuator?
Only after reverifying valve condition, required torque, shaft and bracket interface, rotation, travel, leakage and the revised control objective.
Manufacturer, standards and public technical sources
Manufacturer documents establish product capability. ASHRAE and ISO sources provide facility, cooling and commissioning context; approved project design remains controlling.
- S1 · GRUNEROfficial servomotor product entry
Official entry for the GRUNER actuator range.
- S2 · GRUNEROfficial product download center
Source for current data sheets and manuals before selection and procurement.
- S3 · ASHRAEData Center Design and Operation resources
Technical context for data center thermal environment, cooling and operations.
- S4 · ISOISO/IEC 22237-1:2021 Data centre facilities and infrastructures
General framework for data center facility lifecycle and availability.
- S5 · GRUNERSupplied V2..ABV, 910, 920, 930 and HVAC product material
Basis for the valves, actuators and selection fields on this site; current manufacturer documents govern.
- S6 · ASHRAECommissioning standards and guidance
Process reference for functional testing, commissioning and the handover baseline.
This page is a selection-input framework, not a hydraulic calculation, equipment approval or control program. The designer and manufacturer must confirm Cv/Kvs, differential pressure, authority, torque, speed, materials, pressure-temperature rating, interface and fail state against the project and current documents.