Danfoss RA 2000 1PS Data sheet
Data sheet RA 2000 1PS
Thermostatic Radiator Valve
For Use on One-Pipe Low-Pressure
Steam Systems
Typical
Installation:
Dial / Operator / Sensor + Valve
FREE STANDING RADIATORS
The free-standing one-pipe low-pressure steam radiator is positioned where air continually passes
freely over the operator
Use standard or tamper resistant
model with combined dial/
operator/sensor. Always install
the operator horizontally
FREE STANDING RADIATORS
The free-standing one-pipe low-pressure steam radiator is accessible, but due to obstruction air
cannot continually pass freely over the operator
Use dial / operator with remote
sensor. The sensor and capillary
tube may be extended up to 6’
and can be easily wall mounted.
Use air vent
PLUS
1/8” one-pipe
steam valve
Use air vent
PLUS
1/8” one-pipe
steam valve
CONVECTORS
The one-pipe low-pressure steam convector is inaccessible; room air cannot continually pass freely
over the sensing element
Use operator with combined
remote dial / sensor. The dial/
sensor and capillary tube may be
extended up to 6’ and are wall
mounted.
Use air vent
PLUS
Two 45° elbows
PLUS
1/8” one-pipe
steam valve
ENCLOSED RADIATORS
The cabinet enclosed radiator conguration requires that the dial and sensor be mounted separately,
away from the valve
Use operator with separate
remote dial and remote sensor.
Place the remote sensor on a
draft-free wall. The remote dial
mounts on the enclosure or wall.
Use air vent
PLUS
1/8” one-pipe
steam valve
VDSXA222 © Danfoss 06/16
1
Data sheet
3-5/32”
31-32”
RA 2000 1PS
Thermostatic Radiator Valve
For Use on One-Pipe Low-Pressure
Steam Systems
Design & Function:
• Danfoss’ RA 2000 1PS one-pipe steam
thermostatic radiator valve provides
accurate temperature control and quite
operation.
• The movement of air across the
thermostatic operator eects the
modulation control in regulating the
venting of air from the radiator or
convector.
• Based on the set temperature on the
operator, the 1PS regulates the amount
of steam allowed into the emitter by
controlling the amount of air allowed to
vent out.
• The venting action occurs during each
system (boiler) on-cycle only when heat
Part Material
1. Valve
2. Valve disc
3. Spindle guide
4. Spring
5. Back seat washer
6. Valve Spindle
7. Pressure pin
8. Clamping band
9. Allenscrew
10. Socket
11. Bellows
12. Handle
13. Adjustment spring
14. Safety spring
15. Pressure spindle
16. Air vent
17. Retainer
18. Packing gland
19. Capillary Tube
Nicel plated brass
EPDM
Phosphor bronze
Stainless Steel
EPDM
Brass
Stainless steel
Al. alloy
Steel
Zytel Nylon
Phosphor bronze
ABS
Steel
Steel
Polymide No. 6
Brass
Steel
is required. Air will re-enter the system
during the boiler o-cycle via a patened
“across the seat” vacuum breaker. This
eliminates condensate buildup and allows
natural system aspiration to take place.
• The RA 2000 1PS assembly is specically
designed for low pressure steam systems.
The system pressure should not be
constant preventing air to get back into
the system.
• Thermostatic radiator valve assembly-
valve, thermostatic operator and air ventcan be used for free standing radiators,
convectors, and enclosed radiators. 1PS
is not recommended for copper n tube
radiators.
Dimensions:
1-1/32
”
2-7/3 2”
3-1/8 ”
3-5/32”
3-1/8 ”
2
2-11/64”
2-1/4”
3-7/16”
VDSXA222 © Danfoss 06/16
1-3/8”
1-27/64”
2-13/16”
3-1/8 ”
3-5/32”
3-5/32”
3-1/8 ”
3-7/16”
2-11/64”
2-7/32”
1-1/16”
2-1/4”
2-7/32”
3-3/16”
1/8” NPT
5-3/16”
1-1/4”
27/32 ”
1-1/4”
11/3 2”
13/32”
1/8” NPT
1-21/32”
29/32”
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