Design
AS 1357.2
LIC 2532
Field of application
9.0068.09 0449
Maintenance
Operation
Open the isolating valves after the installation is complete.
On models with adjusting knob, the pressure is adjustable
between 0,5 and 5 bar (it is factory preset at 4 bar)(see
Fig. A) :
1- Slacken the set screw in the handle.
2- Turn knob counterclockwise (-)
3- Open and close a tap downstream of the pressure
reducer
4- Turn handle clockwise (+) to the desired pressure
5- Tighten set screw
On sealed models, the outlet pressure is indicated on the
sealing disc (see Fig. B).
Fig. A
Fig. B
Installation
Pressure reducing valve with balanced single-seated
Internals and coaxially arranged strainer. The complete
control unit can be exchanged by removing spring cap
without any change to the downstream pressure setting.
Several factory settings are available for downstream
pressure, set or adjustable.
The 312 valve differs from the 315.5 valve in that the latter
has a check-valve made of POM (WRC approved) in the
outlet port.
Body made of bronze / DZR material; spring cap high
grade glass reinforced plastic; diaphragm and seals made
of heat and age proof rubber elastic material, diaphragm
reinforced by polyamide fabric inlay; spring made of spring
steel wire, corrosion protected; all other inner parts made
of steel 1.4305 / DZR-material; strainer made of corrosion
protected steel, mesh width 0,25 mm.
Pressure gauge connection :
Rp1/4 ISO228/1,
both sides
Inlet pressure :
max. 16 bar
Outlet pressure :
0,5 - 5 bar; factory
setting 4 bar
Operating temperature :
max. 60 °C
Media :
water, compressed
air, neutral non-
adhesive liquids,
neutral gases
Reduction ratio :
max. 10:1
Installation position :
any orientation
The pressure reducing valve 312 / 315.5 is used for
reducing pressure in closed systems with media as given
in the specifications below.
The pressure reducing valve should be fitted free from
stress into the water supply. Installation in the main
supply is recommended to produce equal pressure values
in the whole installation. The valve is protected against
malfunction (caused by dirt particles) by an incorporated
strainer (mesh width 0,25mm). In case of particles of less
size, we recommend the installation of a SYR Drufi filter.
For proper operation, the inlet pressure shall be at least 1
bar higher, than the indicated outlet pressure.
In cases where irreparable damage has been caused to
the cartridge a spare cartridge can be purchased and fitted
without the need to replace the entire valve.
Under normal conditions the pressure reducing valve
should not require any special maintenance.
If the outlet pressure increases to the same level as the
inlet pressure, the valve seat may be clogged. If so, it will
be necessary to clean the built in pressure reducer
cartridge.
To do this,
1- Close isolating valves upstream and downstream of
the pressure reducer
2- Unscrew cap
3- Remove the cap together with complete control unit
4- Rinse in clean water
Do not use any solvents
to clean the strainer as
this may cause damage
to the plastic
components of the valve.
The complete cartridge can
now be replaced into the
body.
The pressure setting will not
need to be reset due to the
unique design of the SYR
312 / 315.5 valve.
