Danfoss AVDA, AVDSA Data sheet [nl]

Data sheet

Differential pressure relief controller
AVDA - internal thread, PN 10
AVDSA - internal thread, PN 16

Description

AVDA AVDSA

Ordering AVDA, AVDSA Controller

Example:
Differential pressure relief
controller, DN 15, kvs 1.9, PN 16,
setting range 0.05 - 0.5, t
int. thread

- 1x AVDSA DN 15 controller
Code No: 003N8204

max

130°C,

Picture Type DN

AVDA

AVDSA

AVDA and AVDSA are self-acting temperature
controllers used for constant flow control or
bypass control. Controller opens on rising
differential pressure.

The controller has a control valve, an actuator
with one control diaphragm and handle for
differential pressure setting.

For apartment block heating, district heating
plant and central heating systems.

Main data:

• DN 15, 20, 25

• kvs 1.9, 3.4, 5.5

• PN 10, 16

• Setting range:

0.1 - 1.2 bar (AVDA)

0.05 - 0.5 bar (AVDSA)

• Temperature:

- Circulation water / glycolic water up to 30%:
2 … 130 °C

• Connections: Int. thread

k

vs

m3/h

15 1.9

20 3.4 Rp ¾ 003N0039

25 5.5 Rp 1 003N0040

15 1.9

20 3.4 Rp ¾ 003N8205

25 5.5 Rp 1 003N8206

Setting range

PN

bar

10 0.1 - 1.2

16 0.05 - 0.5

Connection

- valve

Int. thread

ISO 7/1

Rp ½

Rp ½

Connection

Impulse

tube flare

7/16-20 UNF

7/16-20 UNF

Code No.

003N0038

003N8204

1)

2)

2)

1)

The code no. in cludes 2 impulse tube s (0.5 and 1.5 m) with tailpi eces.

2)

Available on r equest

Service kits

Picture Type designation for Code No.

Repair set

Two diaphragms, two O-rings, one rubber cone,
one tube of grease and eight valve cover screws

Brass-dipped nipple (two supplied as standard) AVDA, AVDSA 631X4700

Valve stuffing box AVDA, AVDSA 065F0006

Diaphragm housing

DH-SMT/SI VD.55. B1.02 © Danfoss 0 8/2006 1

DN 15 003N4006

DN 20 003N4007

DN 25 003N4008

AVDA 003N0065

AVDSA 003N0284

Data sheet Differential pressure relief controllers AVDA (PN 10) and AVDSA (PN 16)

Technical data

Application principles

Nominal diameter DN 15 20 25

k

value m3/h 1.9 3.4 5.5

vs

Nominal pressure PN AVDA: 10, AVDSA: 16

Max. differential pressure bar

Medium Circulation water / glycolic water up to 30%

Medium pH Min. 7, max. 10

Medium temperature 2 … 130 oC

Materials

Valve body MS 58, hot-pressed, DIN 17660, W.No. 2.0402, CuZn40Pb2

Valve seat Cr Ni steel, DIN 17660, W.No. 1.4301

Valve cone NBR-rubber

Spindle Dezincing-free brass, BS 2874/CZ132

Diaphragm housing Zinc-cromated steel, DIN 1624, W.No. 1.0338

Diaphragm EPDM-rubber

7

Installation positions The valve body can be installed in any position.

A Danfoss FV strainer is recommended.

Impulse tubes have to be installed vertically
or horizontally onto the main pipe, never
downwards.

Needle valve can be installed between main pipe
and impulse tube, if necessary.

Design

1. Handle for differential
pressure setting

2. Spring housing

3. Setting spring

4. Spring guide

5. Diaphragm

6. Valve cone

7. Spindle

8. O-ring

9. O-ring gland

10. Diaphragm housing

11. Control diaphragm

12. Nipple for impulse tube

13. Lead seal

(+) impulse tube has to be connected to flow
line, (-) impulse tube has to be connected to
return line. Setting can be simplified by using
pressure indicators (manometers) placed close to
impulse tube connections.

By turning diaphragm housing downwards the
letter “RA” on valve housing must be oriented
upright.

AVDA AVDSA

2 VD.55. B1.02 © Danfoss 0 8/2006 DH-SMT/SI