ARI Armaturen PRESO User Manual
Operating and installation instructions
Pressure regulating valve PRESO
(spring loaded)
®
PRESO
(Series 750)
Contents
1.0 General information on operating
instructions .....................................................2
2.0 Notes on possible dangers........................... 2
2.1 Significance of symbols ..........................................2
2.2 Explanatory notes on safety information .................2
3.0 Storage and transport .................................. 3
4.0 Description.....................................................3
4.1 Scope of applications ..............................................3
4.2 Operating principles ................................................3
4.3 Diagram...................................................................4
4.4 Parts list ..................................................................4
4.5 Technical data Technical data - remarks .................5
4.6 Marking ..................................................................5
5.0 Installation......................................................6
5.1 General notes on installation...................................6
5.2 Requirements at the place of installation ................6
5.3 Strainer ...................................................................7
®
5.4 Safety valves .......................................................... 7
6.0 Putting the valve into operation .................. 7
6.1 Setting instructions ................................................ 8
6.1.1 Removing the cap ........................................... 9
6.1.2 Changing the pressure range
“without” spring change.................................... 9
6.1.3 Changing the pressure range
“with” spring change ........................................ 9
7.0 Care and maintenance................................ 10
8.0 Troubleshooting .......................................... 10
9.0 Troubleshooting table ................................11
10.0 Dismantling the valve or the top part ..... 12
11.0 Warranty / Guarantee ................................ 12
12.0 EC declaration of conformity................... 13
Rev. 0040402000 0410 englisch
Operating and installation instructions
PRESO
1.0 General information on operating instructions
These operating instructions provide information on mounting and maintaining the fittings.
Please contact the supplier or the manufacturer in case of problems which cannot be
solved by reference to the operating instructions.
They are binding on the transport, storage, installation, start-up, operation, maintenance
and repair.
The notes and warnings must be observed and adhered to.
- Handling and all work must be carried out by expert personnel or all activities must be
supervised and checked.
It is the owner’s responsibility to define areas of responsibility and competence and to
monitor the personnel.
- In addition, current regional safety requirements must be applied and observed when
taking the fittings out of service as well as when maintaining and repairing them.
The manufacturer reserves the right to introduce technical modifications at any time.
These Operating Instructions comply with the requirements of EU Directives.
®
2.0 Notes on possible dangers
2.1 Significance of symbols
ATTENTION !
. . .
2.2 Explanatory notes on safety information
In these Operating and Installation Instructions dangers, risks and items of safety
information are highlighted to attract special attention.
Information marked with the above symbol and “ATTENTION!” describe practices, a failure
to comply with which can result in serious injury or danger of death for users or third parties
or in material damage to the system or the environment. It is vital to comply with these
practices and to monitor compliance.
All other information not specifically emphasised such as transport, installation, operating
and maintenance instructions as well as technical data (in the operating instructions,
product documentation and on the device itself) must also be complied with to the fullest
extent in order to avoid faults which in turn can cause serious injury to persons or damage
to property.
Warning of general danger.
Non-compliance with operating instructions is dangerous!
Read the operating instructions before installation, operation,
maintenance or disassembly and adhere to them strictly.
Page 2 Rev. 0040402000 0410
Operating and installation instructions
PRESO
®
3.0 Storage and transport
ATTENTION !
- Protect against external force (like impact, vibration, etc.).
- Valve mountings such as actuators, handwheels, hoods must not be used to
take external forces, e.g. they are not designed for use as climbing aids, or as
connecting points for lifting gear.
- Suitable materials handling and lifting equipment should be used.
See catalog sheet for weights.
- At -20°C to +65°C.
- The paint is a base coat to protect against corrosion during transportation and storage. Do
not damage paint protection.
4.0 Description
4.1 Scope of applications
Pressure regulating valves are used for „passing excess media in pressure systems“.
The valve has no safety function.
ATTENTION !
- Refer to the data sheet for applications, limits on use and possibilities.
- Certain media require or preclude the use of special materials.
- The valves are designed for standard operating conditions. If conditions exceed
these requirements, e.g. aggressive or abrasive media, the operator should
state the higher requirements when ordering.
- Valves made from grey cast iron are not authorised for use in systems subject
to TRD 110.
The information complies to the Pressure Equipment Directive 97/23/EC.
It is the responsibility of the machine planner to ensure compliance.
The special markings on the valve must be taken into account.
Refer to the catalogue sheet to see which materials are used in standard versions.
Please contact the supplier or the manufacturer if you have any questions.
4.2 Operating principles
A pressure regulating valve is a valve where a preset pressure or a differential pressure is
adjusted an the valve opens and closes automatically.
The over flow function is regulated through a spring.
Rev. 0040402000 0410 Page 3
4.3 Diagram
Operating and installation instructions
PRESO
®
Fig. 753
Fig. 1
4.4 Parts list
Pos Description Pos Description
1 Body 14 Spindle unit
3 Stud 15 Gasket
4 Guide plate 16 Spring plate (top)
5 Guide bush 17 Adjusting screw
6 Gasket 21 Lock nut
7 Gasket 26 Spring plate (bottom)
8 Hex. nut 27 Gasket
9 Travel limiter ring 30 Cap
11 Bonnet 37 Spring
12 Disc unit
Refer to the data sheet for information about materials with designations and figure
numbers.
Page 4 Rev. 0040402000 0410
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