Hattersley 4925, 4923 Operating Instructions Manual

PN25 Butterfly Valve

Fig. 4925 Butterfly Valve
Fig. 4923 Butterfly Double-Regulating Valve

CE MARKING AND THE PRESSURE
EQUIPMENT DIRECTIVE 2014/68/EU

The Pressure Equipment Directive applies to all valves with a maximum
allowable pressure greater than 0.5 bar. Valves with a maximum allowable
pressure not exceeding 0.5 bar are outside the scope of the Directive. Valves
are categorised in accordance with the maximum working pressure, size and
ascending level of hazard, which is dependent on the fluid being transported.
Fluids are classified as Group 1, dangerous fluids or Group 2, all other fluids
including steam. Categories are SEP (sound engineering practice) and for
ascending levels of hazard, I, II, III or IV. All valves designated as SEP do not
bear the CE mark nor require a Declaration of Conformity. Categories I, II, III or
IV carry the CE mark and require a Declaration of Conformity (Note- all valves
up to and including 25mm (1”) having a maximum allowable pressure greater
than 0.5 bar are designated SEP regardless of fluid group.)

PRODUCT LIFE CYCLE

The life of the valve is dependent on its application, frequency of use and
freedom from misuse. Compatibility with the system into which it is installed
must be considered. Valves must be installed into a well-designed system
and it is recommended that the system be inspected in accordance with the
appropriate national and regional legislation. The properties of the fluid
being transported such as pressure, temperature and the nature of the fluid
must be taken into account to minimise or avoid premature failure or non­operability. A well-designed system will take into consideration all the
factors considered in the valve design, but additionally electrolytic
interaction between dissimilar metals in the valve and the system must be
examined. Before commissioning a system, it should be flushed to
eliminate debris and chemically cleaned as appropriate to eliminate
contamination, all of which will prolong the life of the valve.

Installation and Operating Instructions

BUTTERFLY / BUTTERFLY DOUBLE REGULATING VALVES Fig. 4925 / Fig. 492302

PRESSURE/TEMPERATURE RATING

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.

LIMITS OF USE

These valves have been categorised in accordance with the Pressure Equipment Directive 2014/68/EU.

On no account must these valves be used on any group 1 liquids, group 1 gases, group 2 gases or unstable fluids.

N

ote - Valves that are classified as SEP (Sound Engineering Practice) are not CE marked and therefore do not require a declaration of

c

onformity.

* Category I requires the CE mark

LAYOUT AND 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.

Fig No / Body Style

Liner Material /

Temperature Limits

Pressure

Rating

Product Application PED Category by Valve Size

G

roup 1

Gas

G

roup 2

Gas

G

roup 1

Liquid

G

roup 2

Liquid

SEP I II

4

923 Fully Lugged Butterfly DRV Lever

4923 Fully Lugged Butterfly Lever

EPDM -10 to 120°C PN25 - - -

✓

50-150 - -

4923G Fully Lugged Butterfly DRV Lever

4925B Fully Lugged Butterfly Bareshaft

4925G Fully Lugged Butterfly Gearbox

EPDM -10 to 120°C PN25 - - -

✓

50-200 250-600 -