Danfoss AB-PM DN 65 Ficha de dados - Página 10

Procurar online ou descarregar pdf Ficha de dados para Controlador Danfoss AB-PM DN 65. Danfoss AB-PM DN 65 12 páginas. Pressure difference controller with integrated flow limiter

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Data sheet

Design

1. Shut off knob

2. Differential pressure setting

spindle

3. Membrane

4. DP cone

5. Seat

6. Valve body

7. Control valve cone

8. Locking screw

9. Scale

10. Stuffing box

11. Spindle

12. Impulse tube

13. Brass handle

10 | VD.HR.D1.02

AB-PM DN 40-100

Do not turn the spindle more than 40 turns as it will become disengaged.

Fig. 14 AB-PM DN 65-100

DPCV

AB-PM is a combined automatic balancing valve.

It works as differential pressure controller (DPCV)

or pressure independent control valve (PIBCV),

flow limiter and zone controller/control valve.

As DPCV it keeps a constant differential pressure

over the control loop and when installed as a

PIBCV it keeps the pressure constant over the

control valve ensuring it full authority.

Higher pressure acts on the lower side of the

control membrane (3) via an impulse tube (12)

while the lower pressure in the return pipe acts

on the upper side of the membrane (use either

membrane or diaphragm. Do not mix these

two, it will help clarity). When available pressure

increases at partial loads, the membrane closes

and thus keeps the differential pressure stable.

(turns)

Min. setting (factory

...

Max. setting

Factory presetting

Δp setting

min. setting (0 turns)

Flow %

80 100 DN

PIBCV

The control part of AB-PM is working as a

flow limiter. This enables to set a required

combination of the design flow as well as the

needed Δp. By presetting the AB-PM, the flow

rate is defined based on the pressure demand of

the loop or terminal unit.

With an actuator mounted on the valve, AB-PM

can be used as a zone valve. When the AB-PM is

converted to a PICV it can be used, together with

an actuator, as a full authority control valve with

either a linear or a logarithmic characteristic.

Δp setting

setting)

...

DN 65-100

100%

80 100