Balancing Valves · Variable Orifice Double Regulating Valves
PN16 Ductile Iron Variable Orifice Double Regulating Valves
PN16 ductile iron variable orifice double regulating valves are the Y-pattern globe execution of hydronic system balancing: two integral pressure test points give flow measurement, regulation and isolation in one body, and the double regulating mechanism lets the valve be closed for isolation and reopened exactly to its pre-set position, so the balanced flow rate survives every intervening isolation. The benchmark execution covers DN65 to DN300 at PN16 with flanged ends, 10-120 C service, and flow measurement accuracy of plus or minus 10 percent at the fully open position.
Part of the Variable Orifice Double Regulating Valves family
Last updated: 2026-11
Specifications
| size range | DN65 to DN300 |
|---|---|
| pressure class | PN16 |
| temperature range | 10 to 120 °C |
| end connections | Flanged |
| body materials | Ductile Iron |
| flow measurement | Two integral pressure test points for flow measurement, regulation and isolation; Y-pattern globe body |
| measurement accuracy | ±10% at the full open position |
| accuracy standard | Accuracy reduction at partial openings per BS 7350 |
| regulating feature | Isolation duty with reopening to the pre-set balancing position |
Application & selection guidance
Select this execution for medium and large HVAC heating and cooling circuits where a variable orifice readout is acceptable and isolation duty is needed at the same branch point - the double regulating feature is the reason to prefer it over a plain balancing valve at pump manifolds, risers and major branches. Verify the target flow against the published flow measurement graphs for the size, and remember that readout accuracy degrades at partial openings in accordance with BS 7350, so size the valve to operate near open where possible.
Frequently asked questions
Why choose a variable orifice double regulating valve instead of a fixed orifice design?
The variable orifice execution measures flow across the full valve travel and covers DN65 to DN300 at PN16, which makes it the practical choice on larger ductile-iron pipework where a bronze fixed orifice range ends at DN50. The trade is accuracy: plus or minus 10 percent at the full open position, with some reduction at partial openings per BS 7350, versus the tighter accuracy of integral fixed orifice designs - so large branches suit this execution and small circuits suit fixed orifice.
What does the double regulating feature actually do during commissioning?
It couples a memory stop to the regulating spindle: the valve can be fully closed for isolating the branch during the rest of commissioning, and when reopened it stops at exactly the pre-set balancing position. The balanced flow setting is therefore retained without re-measuring after any isolation event, which is what makes the valve usable as both an isolation point and a balancing point.
What information is needed to quote and size this valve?
The design flow rate and the size (DN65 to DN300) so the flow measurement graphs can be checked for a workable readout, the system pressure class (PN16 flanged), the medium temperature within 10-120 C, and whether injection or circuit duty applies. With those points the readout quality and the pre-set position can both be fixed in one pass.
Ordering & documentation
Documents
Ask for the documentation set you need with the inquiry — typical items for this execution (material certificates, test reports to the listed inspection standard, dimensional drawings) are confirmed and supplied with the quotation.
Quotation
A quotation-ready inquiry states: nominal size and pressure rating, body and seat material preference, end connection, operation, and the service medium with temperature. Typical values on this page are benchmark reference ranges; the binding values are confirmed at quotation.
Sample & supply
Supply terms, order quantities and lead time are agreed per order — state the destination country and required schedule with the inquiry.
Storage & shipping
Store valves with seats and seals protected from UV, ozone and deformation, keep end-face protectors on until installation, and for elastomer- or PTFE-seated executions avoid prolonged outdoor storage — seat compounds age fastest in direct sunlight and freezing conditions.
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