ISO 9001
INSTALLATION
HYDRAULIC CONNECTIONS
Respect the fl uid direction as indicated in Fig. 1 and 2. In par-
ticular, we specify that the valves must be mounted as mixing
valves with inlet in A and in B and outlet AB.
VALVE MOUNTING
Before mounting the valve, make sure pipes are clean, free from
welding slags. The pipes must be perfectly aligned with the valve
body and not subjected to vibrations. For installations on plants
with high temperature fl uids (steam, overheated water, diathermic
oil) use expansion joints to avoid the dilatation of pipes to stress
the valve body.
Install the valves with the actuator in vertical position for fl uid
temperature up to 120°C, with higher temperatures they must
be mounted horizontally.
NOTE: Following the hydraulic installation it is necessary to
check the tight of the stem packing placed on the bon-
net, both in cases of low and high temperatures. The
valves require periodic maintenance.
Avoid the valve installation in plants, which are considered ag-
gressive and/or corrosive for valve materials.
Please contact our Sales Support in order to determine which
potentially aggressive or polluting substances can be used.
We disclaim all responsibility in case of valve failure due to ex-
ternal fortuitous events (fi re, earthquakes etc.).
Note: The actuator can be rotated with respect to the valve
body by blocking the ring nut; after such operation re-
tighten the ring nut.
Attention
: The stem of 3FSA.S bellows seal valves must never
rotate with respect to the valve body it is connected to through
the bellows.
MODEL DESCRIPTION
248
stem heater for applications on -10 °C low temperature
fl uid with MVH, MVF and MVE actuators
ACCESSORIES
MOTORIZED VALVES OPTIONS
MODEL
DESCRIPTION
A125-3
flanges with ANSI125 bolt holes (for 3FSA/3FSAS
DN50÷65 and 3FGB DN25÷150)
A150-3
fl anges with ANSI 150 bolt holes (for 3FSA/3FSAS
DN50÷65 and 3FAA/3FAAP DN50÷125 valves)
A300-3
fl anges with ANSI 300 bolt holes (for 3FSA/3FSAS
DN25÷65, 3FAA/3FAAP DN32÷65 and DN100÷125
valves)
ACTUATORS TECHNICAL CHARACTERISTICS, WIRING
DIAGRAMS AND INSTALLATION
See actuators data sheets and mounting instructions.
APPLICATION SCHEMES
Constant fl ow mixing to the user
Variable fl ow mixing to the user
FIG. 1
FIG. 2
USER
USER
N4097
1
st
Issue
rev.
c
02/12
2
DBL317e