FläktGroup LQAZ-19 Automatic purging valve, LQAZ-20 Niipple Installation guide

Brand: FläktGroup

Model: LQAZ-19 Automatic purging valve, LQAZ-20 Niipple

Type: Installation guide

FläktGroup DC_9155GB 20180326_R0 Speciﬁcations are subject to alteration without notice

LQAZ-19 AUTOMATIC PURGING VALVE,

LQAZ-20 NIPPLE

INSTALLATION INSTRUCTION

GENERAL

The type LQAZ-19 is an automatic ﬂoat-controlled airpurging valve

incorporating a non-return valve. The valve is designed for use in

water circuits at maximum conditions of 115 °C and 1,1 MPa (11 bar).

The valve is impervious to high water temperature and to water

containing an anti-freeze. Each valve is pressure-tested and checked

for tightness prior to delivery.

PRINCIPLE OF OPERATION

The ﬂoat drops as air accumulates in the housing, al-lowing the valve

to open and discharge the air. Water then ﬁlls the housing, lifting the

ﬂoat and closing the valve.

INSTALLATION

The valve must be installed vertically with the vent facing upwards.

Note that a minimum clearance of 12 mm must be provided above the

cap. The non-return valve and purging valve are supplied separately.

The non-return valve should be ﬁtted in an LQAZ-20 nipple (see Figs.

2 and 3). before mounting the purging valve in position. The non-return

valve is provided with a gasket, providing a self-sealing joint between it

and the housing.

OPERATION

In service, the valve cap on top of the purging valve should be unscrewed

two turns. Purging cannot takeplace if the cap is screwed down fully.

MAINTENANCE

The valve may be cleaned as follows if leakage occurs due to the

ingress of dirt: Unscrew the housing from the nonreturn valve, leaving

the latter in position in the LQAZ-20 nipple. Unscrew to top of the

housing from the bottom half and clean the components, for example

by blowing with compressed air.

ø 34

Min.

R3/8"

Fig. 1

LQAZ-19

LQAZ-20

Finned coil

Fig. 2

LQAZ-20

4,0 cm

LQAZ-19

Fig. 3

Valve cap

Valve housing

Non-return valve

Nipple

FläktGroup LQAZ-19 Automatic purging valve, LQAZ-20 Niipple Installation guide

FläktGroup LQAZ-19 Automatic purging valve, LQAZ-20 Niipple Installation guide

FläktGroup LQAZ-19 Automatic purging valve, LQAZ-20 Niipple Installation guide

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