Danfoss RTD-G 20, RTD-G 25 Data sheet

Data Sheet

High Capacity Valve Body, Type RTD-G (Internal

Thread)

Application

The RTD-G high capacity on/off valves are used in zone control applications. The valves can be combined with Danfoss TWA-D thermal actuator.

RTD-G valves are fitted with a grey protective cap. This cap must not be used as a manual shut off device.

A special manual shut off device is available (code no. 013G3305).

The pressure pin in the gland seal is of chromium steel and works in a lifetime lubricated O-ring. The complete gland seal assembly can be replaced without draining the system.

In order to avoid depositions and corrosion the composition of the hot water must be in accordance with the VDI 2035 Guidelines.

It is recommended that formulations containing mineral oil are avoided.

Systems

Zone control application

Ordering and Specifications

Thermal actuator TWA in combination with room thermostat/programme in radiator or floor heating systems.

		Connection	kVS-value1)	Max.	Differential pressure2)		Test	Max.
	Type	ISO 7-1	[m3/h]	working	TWA NC	TWA NO	pressure	flow	Code no.
				pressure				temp.
	RTD-G 20	RP 3/4	3.81						013G1826
	straight
				16 bar	1.8 bar	1.9 bar	25 bar	120 °C
	RTD-G 25	RP 1	4.58						013G1828
	straight

1)The kVS-value states the water flow (Q) in m³/h at a pressure drop (∆p) across the valve of 1 bar at fully open valve.

2)Working pressure = static + differential pressure. The maximum differential pressure specified is the maximum pressure at which the valves give satisfactory regulation. As with any device which imposes a pressure drop in the system, noise may occur under certain flow/pressure conditions. To ensure quiet operation, maximum pressure drop should not exceed 30 to 35 kPa. The differential pressure can be reduced by the use of the Danfoss differential pressure regulators.

Accessories	Product	Units	Code no.
	Gland seal (can be replaced with the heating system in operation)	10 pcs.	013G0290

Danfoss Heating Solutions

VDGWF102

© Danfoss

02/2012

1

Data Sheet	High Capacity Valve Body, Type RTD-G (Internal Thread)

Capacities

RTD-G DN20

RTD-G DN20	kvs

∆p

∆p

∆p

[kPa]

[mwg]

[bar]

	[l/h]
∆t = 15˚C	kW
∆t = 20˚C	kW

RTD-G DN25

RTD-G DN25 kvs

∆p

∆p

∆p

[kPa]

[mwg]

[bar]

	[l/h]
∆t = 15˚C	kW
∆t = 20˚C	kW

2

VDGWF102

© Danfoss

02/2012

Danfoss Heating Solutions