One assembly for two mixed circuits with return flow utilization and two-zone principle at the buffer storage tank   For highly efficient two-zone discharge of a buffer storage tank in a mixed low-temperature circuit (2nd mixing circuit) with highly efficient use of the return flow of a mixed high-temperature circuit (1st mixing circuit).   With this product it is possible to double to triple the usable buffer volume.

Capacity DN 25 light version: 1. mixing circuit: Kvs = 6,2 - V'max[100mbar] = 2m³/h - Q'max[20K] = 47kW 2nd mixing circuit: Kvs = 6.2 - V'max[100mbar] = 2m³/h - Q'max[10K] = 23kW   Capacity DN 25 heavy version: 1. mixing circuit: Kvs = 11,9 - V'max[100mbar] = 3,8m³/h - Q'max[20K] = 88kW 2nd mixing circuit: Kvs = 12,9 - V'max[100mbar] = 4,1m³/h - Q'max[10K] = 48kW   Capacity DN 32 version: 1. mixing circuit: Kvs = 11,9 - V'max[100mbar] = 3,8m³/h - Q'max[20K] = 88kw 2. mixing circuit: Kvs = 18,9 - V'max[100mbar] = 6m³/h - Q'max[10K] = 70kW

A dual circuit (one mixed) assembly with return utilization and built-in high efficiency Grundfos UPM3 pump.   For highly efficient use of the return flow of a high temperature circuit in a mixed low temperature circuit at a condensing boiler, stratified storage tank or heat transfer station.

Capacity DN 25 light version: Heating circuit: Kvs = 6,2 - V'max[100mbar] = 2m³/h - Q'max[20K] = 47kW generator circuit: Kvs = 6,2 - V'max[100mbar] = 2m³/h - Q'max[10K] = 23kW   Capacity DN 25 heavy version: Heating circuit: Kvs = 11,9 - V'max[100mbar] = 3,8m³/h - Q'max[20K] = 88kW generator circuit: Kvs = 12,9 - V'max[100mbar] = 4,1m³/h - Q'max[10K] = 48kW

For individual room control of floor and wall heating circuits and for hydraulic balancing of individual heat consumers. 

The RTB valve is a thermostatic return temperature limiter with adjustable maximum temperature and fixed minimum flow in the range of 0.5% of nominal flow. The flow rate is adapted to the actual output and the heating circuit is automatically hydraulically balanced, eliminating the need for manual adjustment. In addition, the heating time after the night setback is shortened. In addition, the RTB valve can be used as an individual room control with an adapted heating curve by setting the return flow temperature close to the room temperature. Furthermore, significantly less pump energy is consumed due to lower volume flows. As a practical application of such valves, we recommend mounting them directly on the return collector of commercially available underfloor heating circuit manifolds.

DN15, DpN 100mbar, V'maxN 0.57m³/h, Kvs 1.8
Inlet nipple G¾(a) for conical screw connection (Eurocone), e.g. KRV 18mm
Outlet fitting with union nut G¾(i) for Eurocone
PN 10bar, Tmax 90°C
length: 72mm, height incl. thermostatic head: 67mm, width thermostatic head: 41mm

For hydraulic balancing of individual radiators.

The RTB DN15 T0-40 balancing valve (wheel) is a thermostatic return temperature limiter with adjustable maximum temperature between 0°C and 40°C and without minimum flow.

The flow rate is thus automatically adjusted to the actual heat output and the heating circuit is thus automatically hydraulically balanced, eliminating the need for manual adjustment. In addition, the heating-up time after the night setback is shortened. Opening and closing during control operation prevents the valve from becoming clogged with particles in the heating water. The room temperature is still controlled by the room thermostatic valve, but the flow is limited by the RTB valve. Furthermore, significantly less pump energy is consumed due to lower flow rates. As a practical application of such valves, we recommend installing them instead of the return screw connection of commercial radiators.

DN15, DpN 100mbar, V'maxN 0.57m³/h, Kvs 1.8, can be shut off.
Inlet nipple G¾(a) for conical screw connection (Eurocone), e.g. KRV 18mm.
Outlet nipple Rp1/2
PN 10bar, Tmax 90°C
length: 72mm, height incl. thermostatic head: 67mm, width thermostatic head: 41mm

Steel buffer tank with four fixed discs To reduce turbulence caused by flow.

Available from 600 liters up to 15,000 liters and larger. Zone volumes, connection dimensioning, insulation and, if necessary, coating configurable.