Pressure stabilizing and expansion units must match closed-loop water volume, pressure limits, make-up rate and expansion strategy; wrong sizing can cause pump cycling, relief discharge or low-pressure faults.
YONGFAN JFWP Packaged Skids integrate automated make-up pumps, bladder pressure stabilization, thermal expansion management, overpressure relief, auto air venting, and low-water protection across 8 standard sizes.
Make-up flow specifies how fast lost water is replaced. Expansion volume depends on total loop water content, temperature rise, and allowable pressure swing.
Two buildings with identical floor area can have wildly different water content due to pipe sizing, terminal types, and riser distribution.
Make-up pumps do not lift the full building water column in a closed loop. They inject water against the pressure at the connection point plus local friction.
JFWP-A uses compact controlled-discharge. JFWP-B includes an atmospheric expansion vessel to retain and recover bulk expansion water.
| Model | Max. System Water Capacity | Rated Make-Up Flow | Reference Heating Area | Reference Cooling Area | Working Pressure Classes |
|---|---|---|---|---|---|
| JFWP-1 | 48 m³ | 2.4 m³/h | 10,000 m² | 5,000 m² | 0.6 / 1.0 / 1.6 MPa |
| JFWP-2 | 100 m³ | 4.8 m³/h | 20,000 m² | 10,000 m² | 0.6 / 1.0 / 1.6 MPa |
| JFWP-3 | 160 m³ | 7.2 m³/h | 40,000 m² | 18,000 m² | 0.6 / 1.0 / 1.6 MPa |
| JFWP-4 | 200 m³ | 9.6 m³/h | 60,000 m² | 25,000 m² | 0.6 / 1.0 / 1.6 MPa |
| JFWP-5 | 230 m³ | 11.0 m³/h | 80,000 m² | 35,000 m² | 0.6 / 1.0 / 1.6 MPa |
| JFWP-6 | 260 m³ | 16.0 m³/h | 120,000 m² | 48,000 m² | 0.6 / 1.0 / 1.6 MPa |
| JFWP-7 | 360 m³ | 20.0 m³/h | 150,000 m² | 65,000 m² | 0.6 / 1.0 / 1.6 MPa |
| JFWP-8 | 480 m³ | 24.0 m³/h | 200,000 m² | 85,000 m² | 0.6 / 1.0 / 1.6 MPa |
*Make-up pump heads selectable across 11 standard steps: 24, 32, 40, 48, 56, 64, 72, 80, 88, 96, 104, and 112 m (Motor power 0.37 to 15 kW).
Uses a compact bladder vessel for pressure buffering. When system pressure exceeds upper limits on thermal expansion, overpressure relief discharges through a safety valve and tundish to drain. Best for reliable make-up sources and moderate temperature swings.
Adds an integrated atmospheric expansion vessel. Overpressure discharge is received into the tank and automatically pumped back into the closed loop when pressure drops. Essential for larger temperature swings or intermittent make-up supply.
Total closed-loop water capacity (m³) across piping, terminals, and boilers.
Cold fill temperature and maximum design supply water temperature (°C).
Working pressure class (0.6/1.0/1.6 MPa) and pump head at the connection point.
Compact controlled discharge (A) or atmospheric expansion retention (B).
YONGFAN engineers will calculate expansion volume, verify make-up pump head, and provide GA layout drawings.
Two stainless-steel multistage pumps per skid with automated duty/standby rotation and parallel cut-in logic.
Complete wetted skid circuit tested at 1.5× design pressure for 30 minutes with zero allowable pressure drop.
Operational sequence verified: setpoint cycling, low-water cutoff, relief discharge, and PLC alarm logging.
Factory-wired RS-485 Modbus RTU standard with BACnet MS/TP and IP gateway integration verified on test bench.
The documented family covers 48–480 m³ of maximum closed-system water capacity with rated make-up flow from 2.4 to 24 m³/h across 8 sizes.
JFWP-A is the compact arrangement with controlled overpressure discharge to drain. JFWP-B includes an atmospheric vessel to receive and return bulk expansion water.
Two pumps per skid, with automatic duty/standby rotation and parallel pump cut-in during large leakage events.
No. JFWP includes automatic air venting. Vacuum degassing of dissolved gases belongs to YONGFAN’s separate JFDT Vacuum Degassing product family.
Yes. RS-485 / Modbus RTU is standard. BACnet MS/TP and BACnet/IP gateways are available on request.
5–80 °C for the standard skid. Higher temperatures (90–95 °C) require upgraded EPDM bladders and pump mechanical seals.
Do not select the skid only from floor area; calculate actual closed-loop water content.
Do not calculate make-up head as circulation pump lift; calculate pressure at the injection point.
Do not choose JFWP-A if the project requires retaining expansion water in an atmospheric reservoir.
Do not assume automatic air venting removes dissolved oxygen; specify JFDT for vacuum degassing.
Send your system water volume, design temperature range, and injection point pressure. YONGFAN application engineers will verify make-up flow, expansion volume, and provide complete submittal drawings.
