Hydronic balancing is not a one-time commissioning detail. The valve architecture determines whether design flow remains stable when branch resistance, terminal load or system differential pressure changes.
Compare YONGFAN manual static balancing valves (DRV, KPF DN15–DN600), dynamic automatic flow balancing valves (BYF, B-Type DN15–DN800), ZYC self-actuated branch differential-pressure controllers, and KYEJ electric static balancing valves with 0–10 V / 4–20 mA remote adjustment.
When variable-speed pumps ramp down and control valves close, static valve resistance remains fixed, causing branch flow to drift off design.
Subjecting BYF dynamic balancing valves to ΔP above 300 kPa creates high-velocity cavitation noise and unnecessary pump energy waste.
Specifying balancing valves without upstream and downstream test ports leaves commissioning engineers unable to measure ΔP or prove design flow.
Using 800X differential-pressure bypass valves on individual terminal coils instead of purpose-designed BYF or DRV branch valves.
Conventional adjustable balancing valve for chilled- and hot-water HVAC circuits. Features linear flow characteristic, percentage handwheel scale, PTFE seals, and upstream/downstream pressure test ports for repeatable ΔP flow measurement (PN16, 0–120 °C, ±5% flow accuracy from 100% to 50% opening).
Extends manual static balancing into larger pipe sizes (DN15–DN600, PN 1.6 MPa, 0–100 °C). Tested to GB/T 13927 and API 598 standards with GB/T 17241.6 and GB/T 9113 flange drillings. Features a lockable handwheel position to prevent unauthorized tampering after commissioning.
Automatically maintains preset branch flow as network pressure varies (DN15–DN250, PN 1.6 MPa, 100 °C max medium). Operates across a 20–300 kPa differential-pressure envelope without requiring manual readjustment during partial-load variable-flow operation.
Heavy-duty automatic flow balancing valve for large distribution mains (DN50–DN800, 16 bar / 25 bar, 0–120 °C). Constructed with ductile-iron body, 304-2B stainless trim, 1Cr18Ni9 stainless springs, and NBR N220SH seals, maintaining ±5% flow accuracy over working pressure range.
Maintains stable differential pressure across a protected branch circuit. Senses supply and return pressures through a 1/4″ capillary sensing line. Configured on the return pipe for DN32–DN125 (supply sensing) or supply pipe for DN15–DN25 (return sensing).
Electrically adjustable static balancing valve with integrated ΔP measurement for remote flow verification (AC 24 V, 0–10 V or 4–20 mA control, PN 1.6 MPa, 0–100 °C, 20–300 kPa ΔP, linear flow characteristic, PTFE seal, ±5% flow accuracy from 100% to 50% opening).
| Product | Balancing Method | Published DN Range | Key Operating Data | Best Application Fit |
|---|---|---|---|---|
| DRV | Manual static balancing | Small-to-medium DN | PN16, 0–120 °C, ±5% from 100–50% opening | Conventional commissioning & lockable branch resistance |
| KPF | Manual static balancing | DN15 – DN600 | PN 1.6 MPa, 0–100 °C, API 598 / GB/T 13927 | Larger pipe static balancing & central plant headers |
| BYF | Automatic constant-flow balancing | DN15 – DN250 | PN 1.6 MPa, 20–300 kPa ΔP, max 100 °C | Variable-pressure branches requiring preset design flow |
| B-Type Dynamic | Automatic constant-flow balancing | DN50 – DN800 | 16/25 bar, ±5% flow accuracy, 0–120 °C | Large distribution branches & district heating mains |
| ZYC | Self-actuated differential-pressure control | DN15 – DN125 | 1/4″ supply/return pressure capillary sensing | Stabilizing differential pressure across branch sub-systems |
| KYEJ | Electrically adjustable static balancing | Flanged linear body | AC 24 V, 0–10 V / 4–20 mA, 20–300 kPa ΔP | Remote BMS balancing adjustment & flow verification |
Specified water flow in m³/h or L/s for each branch or terminal loop.
Expected differential pressure across the valve (20–300 kPa for dynamic BYF).
Select Manual Static (DRV/KPF), Dynamic Automatic (BYF/B), or DP Control (ZYC).
Flange standard (GB/DIN/ANSI), or AC 24 V / 0–10 V analog signals for KYEJ.
YONGFAN application engineers will verify flow coefficients, check dynamic cartridge ΔP ranges, confirm flange compatibility, and supply commissioning flow curves.
Every cast-iron, ductile-iron, and bronze balancing valve body is tested to 1.5× nominal pressure per API 598 and GB/T 13927.
DRV and KPF percentage scales are benchmarked against calibrated flow test loops to ensure ±5% flow repeatability.
BYF dynamic cartridges are tested across the 20–300 kPa differential pressure range to verify automatic flow limitation.
KYEJ electric balancing actuators undergo analog signal sweep tests with pressure-port flow calculation verification.
A static valve is adjusted during commissioning and maintains a fixed resistance. A dynamic valve automatically adjusts internal opening to maintain preset flow across variable ΔP.
DRV and KPF are mechanical static balancing valves. KYEJ is an electrically adjustable static balancing valve with 0–10 V / 4–20 mA control.
BYF (DN15–DN250) and B-Type Dynamic Flow Balance Valves (DN50–DN800) automatically hold preset flow across their working ΔP envelope.
Use KPF for large static balancing (up to DN600) or B-Type Dynamic for large automatic flow balancing (DN50 to DN800).
The supplier data states 20 to 300 kPa working ΔP. If ΔP exceeds 300 kPa, pressure-relief measures are recommended to eliminate velocity noise.
ZYC controls differential pressure between supply and return pipes via capillary sensing to stabilize ΔP across a branch sub-system.
Yes. KYEJ accepts standard 0–10 V or 4–20 mA analog control signals for motorized resistance adjustment and flow verification.
No. The 800X is a main-line pilot hydraulic bypass valve for plant headers. It must not be substituted for branch-level DRV, KPF, or BYF balancing valves.
Balancing valves distribute available hydraulic energy; they cannot create flow that the circulation pump is unable to deliver.
Static valves cannot maintain constant flow if network differential pressure changes substantially; use BYF dynamic valves for variable loops.
Dynamic flow cartridges have internal moving regulators. Install upstream strainers to prevent pipe scale and debris fouling.
KYEJ calculates flow from ΔP for balancing; it does not replace MID-certified billing-grade thermal energy heat meters.
Send your branch flow schedules, available pump heads, system differential pressures, and preferred commissioning strategy. YONGFAN application engineers will verify valve sizing, provide flow curves, and supply submittal datasheets.
