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LIMITS OF USE
These valves have been categorised in accordance with the Pressure Equipment Directive 2014/68/EU.
n no account must these valves be used on any group 1 liquids, group 1 gases, group 2 gases or unstable fluids.
Note - Valves that are classified as SEP (Sound Engineering Practice) are not CE marked and therefore do not require a declaration of
conformity.
Fig No / Body Style
4923 Fully Lugged Butterfly DRV Lever
4923 Fully Lugged Butterfly Lever
4923G Fully Lugged Butterfly DRV Lever
4925B Fully Lugged Butterfly Bareshaft
4925G Fully Lugged Butterfly Gearbox
* Category I requires the CE mark
PRESSURE/TEMPER TURE R TING
These valves must be installed in a piping system whose normal pressure and temperature do not exceed the above ratings.
If system testing will subject the valve to pressures in excess of the working pressure rating, this should be within the test pressure for
the body with the valve open, i.e. 1.5 x maximum seat pressure rating.
The maximum allowable pressure in valves as specified in the standards is for non-shock conditions. Water hammer and impact, for
example, should be avoided.
If the limits of use specified in these instructions are exceeded or if the valve is used on applications for which it was not designed, a
potential hazard could result.
END OF LINE SERVICE
It is not recommended to use these valves for end of line service.
If valves are installed at end of line, a blanking flange must be fitted on downstream side of valve.
L YOUT ND SITING
Butterfly valves 4923 and 4923G are fitted with a double regulating device, and may be used in conjunction with a Fig M3000 metering
station.
When used with the Fig M3000 a spool piece must be fitted between the metering station and the valve with a minimum length of 1.5 x
the nominal pipe diameter.
Flow must pass through the metering station first and secondly through the valve.
These valves can be fitted in either horizontal or vertical pipework. When installed in a horizontal pipeline, the valve stem should be
preferably horizontal. This enables the butterfly valve to be self-cleaning and also enables the weight of the disc to be equally borne by
the bearings.
It should be considered at the design stage where valves will be located to give access for operation, adjustment, maintenance and
repair.
Valves must be provided with adequate support. Adjoining pipework must be supported to avoid the imposition of pipeline strains on
the valve body, which would impair its performance.
Heavy valves may need independent support or anchorage.
02
BUTTERFLY / BUTTERFLY DOUBLE REGULATING VALVES Fig. 4925 / Fig. 4923
Liner Material /
Pressure
Temperature Limits
Rating
Group 1
Gas
EPDM -10 to 120°C
PN25
EPDM -10 to 120°C
PN25
Product Application
Group 2
Group 1
Group 2
Gas
Liquid
Liquid
-
-
-
✓
-
-
-
✓
PED Category by Valve Size
SEP
I
II
50-150
-
-
50-200
250-600
-
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