Balancing Valves Β· Fixed Orifice Double Regulating Valves
PN25 Bronze Fixed Orifice Double Regulating Valves
PN25 bronze fixed orifice double regulating valves are the compact commissioning valve for small heating and cooling circuits: the orifice is integral to the valve, so flow is read from one pair of test points without a separate measurement device, and the double regulating memory stop returns the valve to its balanced position after any isolation. The benchmark execution covers DN15 to DN50 at PN25 in bronze, threaded ends to BS EN 10226-2 with parallel alternatives to BS 2779 on the smallest sizes, and commissioning accuracy of plus or minus 5 percent on all settings.
Part of the Fixed Orifice Double Regulating Valves family
Last updated: 2026-11
Specifications
| size range | DN15 to DN50 |
|---|---|
| pressure class | PN25 |
| temperature range | -10 to 120 Β°C |
| end connections | 1" to 2" taper threaded to BS EN 10226-2 (ISO 7-1), formerly BS 21 |
| small size connections | DN15 & DN20 (1/2" & 3/4") BS 2779 (ISO 228) parallel |
| body materials | Bronze |
| measurement accuracy | +/-5% on all settings (integral fixed orifice) |
| testing standards | DVGW (vibration), BS EN 331 (bend) |
Application & selection guidance
Select this execution for terminal branches, fan coils, small AHUs and any circuit up to DN50 where commissioning accuracy matters - the integral fixed orifice reads plus or minus 5 percent on all settings, tighter than variable orifice readouts, with fewer connections to install and leak-test. Match the end connection to the pipework: taper threaded to BS EN 10226-2 (ISO 7-1) for 1 inch to 2 inch sizes, BS 2779 (ISO 228) parallel for DN15 and DN20, and confirm the vibration and bend testing credentials (DVGW, BS EN 331) where the specification calls them.
Frequently asked questions
What makes the fixed orifice design more accurate for commissioning?
Because the orifice is machined into the valve rather than formed by the throttle position, the differential pressure to flow relationship is fixed for every setting. The bronze commissioning range holds plus or minus 5 percent accuracy on all settings, set-up is simpler, and there are fewer test connections to install compared with a separate orifice and valve arrangement.
Which end connections does the DN15 to DN50 range use?
Sizes 1 inch to 2 inch are taper threaded to BS EN 10226-2 (ISO 7-1), formerly BS 21; DN15 and DN20 in 1/2 inch and 3/4 inch are BS 2779 (ISO 228) parallel thread. Match the thread form to the mating fitting before ordering - the two are not interchangeable.
How does the double regulating function behave during system filling and balancing?
The valve balances the circuit at its pre-set position, can be closed to isolate the branch while other circuits are commissioned, and reopens to the same pre-set position afterward - the balanced flow is retained without re-measurement. Vibration testing to DVGW and bend testing to BS EN 331 cover the mechanical robustness of the completed joint.
Ordering & documentation
Documents
Ask for the documentation set you need with the inquiry β 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 β 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 β seat compounds age fastest in direct sunlight and freezing conditions.
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