Guth Ventiltechnik VSR Operating Instructions Manual
Operating instructions
- Translation of the original -
English
GBR
18.4.17
Guth Ventiltechnik GmbH
Horstring 16
D - 76829 Landau
+49 (0) 6341 5105-0Fax: +49 (0) 6341 5105-85
www.guth-vt.de
sales@guth-vt.de
1
Modulating Valves
Type: VSR
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18.4.17
Modulating Valves Type: VSR
List of contents
2
Availability and Completeness
These operating instructions constitute part of the valve delivery and must be kept available so that they can be referred to by authorised personnel at any time. No sections may be removed from these instructions. Should the operating instructions or individual pages be missing,
they must be replaced at once.
Change Service
This documentation is subject to the Change Service of Guth Ventiltechnik GmbH.
Changes may be made to this documentation without notice of such changes
being given.
Copyright
This documentation contains information that is protected by copyright. It may only
be used in connection with the use of the valve.
Guth Ventiltechnik GmbH
Horstring 16
D - 76829 Landau
+49 (0) 6341 5105-0Fax: +49 (0) 6341 5105-85
www.guth-vt.de
sales@guth-vt.de
List of contents .......................................................................................................................2
1. General informations ............................................................................................................... 3
1.1 Intended use ................................................................................................................3
1.2 Notes on the guarantee ...............................................................................................3
1.3 Safety instructions........................................................................................................3
1.4 Danger symbols ...........................................................................................................4
2. Technical Data ........................................................................................................................ 5
2.1 General description ......................................................................................................5
2.2 Design of the valve ......................................................................................................5
2.3 Variants........................................................................................................................6
2.4 Housing variants ..........................................................................................................6
2.5 Lantern variants ........................................................................................................... 6
2.6 Actuator variants ..........................................................................................................6
2.7 Controller variants........................................................................................................ 6
2.8 Valve variants ..............................................................................................................7
3. Functional description .............................................................................................................9
4. Installation of the Modulating valve ....................................................................................... 10
4.1 Installation space .......................................................................................................10
4.2 Installation of the fitting ..............................................................................................10
4.3 Pipe connections........................................................................................................ 10
4.4 Welding seam preparation .........................................................................................11
4.5 Pneumtatic connection............................................................................................... 11
4.6 Electrical connection .................................................................................................. 11
5. Commisioning........................................................................................................................ 12
6. Changes to the Modulating valve .......................................................................................... 12
6.1 Changing the Kvs Value and the Flow Rate Curve....................................................12
6.2 Changing the Effective Direction of the Diaphragm Actuator.....................................13
7. Maintenance and repairs.......................................................................................................14
7.1 Inspection...................................................................................................................14
7.2 Replacing the Cone-Seat Assembly ..........................................................................14
7.3 Replacing the Seals ................................................................................................... 15
7.4 Setting the Spindle, Coupling and Diaphragm Actuator............................................. 17
7.5 Lubrication and Maintenance Schedule ..................................................................... 18
7.6 Valve designation.......................................................................................................18
7.7 Cleaning and care......................................................................................................19
8. Malfunctions .........................................................................................................................20
8.1 Mechanical valve defects (Mechanic) ........................................................................ 20
8.2 Defects on the actuator..............................................................................................21
9. Transport, Packaging and Disposal ......................................................................................23
9.1 Transport and Packaging...........................................................................................23
9.2 Disposal .....................................................................................................................23
10. Data sheet for GUTH Modulating valves............................................................................... 24
10.1 Spring-to-close, Valve model series Type L............................................................... 24
10.2 Air-to-close (Air pressure 6bar) Valve Model Series Type L......................................25
11. Technical Information ............................................................................................................26
11.1 Fields of application and materials.............................................................................26
11.2 Tightening torques .....................................................................................................26
12. Konformitätserklärung / Declaration of Conformity / Deklaracja zgodno?ci ......................... 27
List of contents
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18.4.17
Modulating Valves Type: VSR
1. General informations
3
1. General informations
1 . 1 Intended use
The valve may only be used for areas of use authorized by GUTH. The valve is designed for dosing,
mixing, distributing or reducing in connection with approved media, pressures and temperatures. It
is for use in the foodstuffs, beverages, pharmaceutical and chemical industries.
It has been developed and manufactured in accordance with currently applicable safety standards.
Therefore there is no hazard risk under normal conditions if it is used according to instructions.
1 . 2 Notes on the guarantee
All obligations arising in connection with guarantees are contained in the General Terms and Conditions of Guth Ventiltechnik GmbH.
1 . 3 Safety instructions
The mixer may only be fitted and commissioned by qualified personnel.
Based on the definition laid down in EN 60204-1. Qualified personnel:
A person who, on the basis of his or her specialist training, has acquired knowledge and experience
as well as knowledge of the relevant standards and can evaluate the work entrusted to him or her
and any possible hazards.
NOTICE
Please read this handbook carefully before you begin with the assembly of, commissioning of or
any other work connected with this modulating valve.
• The valve may only be used for approved purposes.
• The company shall accept no liability for damage and operational malfunctions resulting from
failure to observe these instructions.
• Technical modifications resulting in deviations from the illustrations and information contained
in these instructions may be made without prior notice being given.
• The pneumatic actuators contain strongly pre-tensioned springs. This means that there is a
risk of death if actuators are opened. Therefore the actuators may only be opened by qualified
personnel that has been trained by the Guth company.
• Pneumatic actuators exert large positioning forces. Therefore moving parts may only be
touched when not under tension or pressure.
• The device may only be fitted and commissioned in accordance with these operating instructions.
• The manufacturing process did not take account of safety precautions in respect of external
fire.
• Conversion or modification of the fitting may only be carried out in agreement with the Guth
Company.
• The original replacement parts supplied by the Guth Company serve the purpose of ensuring
safety. Should other parts be used, the Guth Company shall accept no responsibility whatsoever for any damage that may result.
• The fitting is designed for connection to protective low voltage only.
• The fitting may only be disassembled when not connected to a voltage supply or under pressure.
• Prior to repair and maintenance operations the product line must be de-pressurised and free
of the product. Product residues and cleaning agents must be removed as well.
• Fittings that come into contact with hazardous media must be decontaminated.
• Never touch the fitting or piping when hot liquids are being processed or the sterilization process is running.
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Modulating Valves Type: VSR
1. General informations
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The valve may only be operated when it is in perfect working order. In addition to the documentation, instructions on the following also apply:
- Internal plant working and safety instructions
- National regulations in the country of implementation
- Generally accepted safety regulations
- Accident prevention regulations
Failure to observe the specified hazard warnings may pose a risk to persons as well as the environment, fitting and plant. Specifically, failure to observe the warnings may cause the following hazards to arise:
- the failure of important functions of the fitting and plant
- the failure of prescribed methods for maintenance and repairs
- hazards to persons caused by electrical, mechanical or chemical agents
- environmental hazards on account of leakage of hazardous substances
1 . 4 Danger symbols
Safety instructions and warnings serve to avoid danger to the lives and health of users or maintenance personnel and damage to property. Attention is drawn to them by means of the symbols
defined here. The hazards are also highlighted where they may arise by means of danger symbols
(pictograms). The meaning of the pictograms is as follows:
• If hot or cold fitting parts represent hazards, then these parts must be shielded against the possibility of persons coming into contact with them by the plant operator.
• For fittings with pneumatic actuators, there is a crush hazard during operation of the actuator
(crushing between the coupling piece and lantern).
• Therefore the actuator must always be rendered pressure-less during all assembly and disassembly work.
Symbol Signal word Meaning
DANGER
Indicates that death, serious injury and/or major
damage will occur if the corresponding safety
precautions are not observed and implemented.
WARNING
Indicates that death, serious injury and/or major
damage can
occur if the corresponding safety
precautions are not observed and implemented.
CAUTION
Indicates that minor injury and/or damage can
occur if the corresponding safety precautions
are not observed and implemented.
ATTENTION
Indicates that which may result in damages of
the product itself or of adjacent vicinity occur if
the corresponding safety precautions are not
observed and implemented.
NOTICE
This refers to important information about the
product itself or its usage to which special attention is to be drawn.
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Modulating Valves Type: VSR
2. Technical Data
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2. Technical Data
2 . 1 General description
VSR series modulating valves manufactured by GUTH represent state-of-the-art control fitting technology using tried and tested stainless steel valve and actuator components. They are used in the
foodstuffs, beverages, pharmaceutical and chemical industries and fulfil the purposes of dosing,
mixing, distributing or reducing the corresponding media, pressures and temperatures.
2 . 2 Design of the valve
The modulating valve consists of four main sections:
a) Modulating valve housing with inner fittings according to the task
involved, consisting of a valve spindle and seat ring(s)
b) Lantern according to the task involved with spindle seal and guide.
c) Reversible stainless steel diaphragm actuator with spring return.
d) Valve positioners:- DigiPos (standard controller)
- Optionally, controller attached according to NAMUR.
Fig. 1 Modulating with DigiPos
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Modulating Valves Type: VSR
2. Technical Data
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2 . 3 Variants
For each of the main elements from a) to d) there are several variants available. The design is modular and they are generally mutually compatible. Exceptions to this are to be found in the steam
modulating valve, pressure reducing valve (high pressure) and aseptic diaphragm modulating valve
series on account of the valve characteristics.
2 . 4 Housing variants
A housing consists of a spherical basic body made of forged stainless steel and one or two connecting pieces with connector types according to customer requirements. On the front end of the
housings with connecting pieces the lantern can be attached, or further housing modules (with seat
ring), a blind connection or a second spindle guide. Several housing units can be coupled together
to fabricate valves with inlets and outlets on different levels with double-seat inner fittings or with
multistage control cones for reducing large pressure differences. The control cones are supplied
with a metal seal seat as standard. In special cases, however, a version with an elastomer seal can
be supplied. For special requirements, the cone and seat ring can be supplied as hardened components.
2 . 5 Lantern variants
The connection between the valve housing and the actuator is provided by the lantern b). This
serves both to guide and to seal the spindle. Here, the seal against the product space is provided
by a separate intermediate module for the upper end of the housing. The spindle is guided through
a bushing with little clearance. Where particularly high standards of hygiene must be maintained,
the chamber between the O-rings has connections for alcohol or steam. Where required on account
of difficult operating conditions, other sealing elements such as a plug socket can be installed as
well. Also, a special aseptic diaphragm and vacuum seal with Teflon-EPDM sealing elements is
available as a special module.
2 . 6 Actuator variants
Diaphragm actuator:
Tab. 1 Diaphragm actuators
Linear thrust actuators:
Tab. 2 Linear thrust actuators
2 . 7 Controller variants
Standard positioners:
As standard, the Guth DigiPos valve positioner is mounted on the diaphragm actuator.
Controller options:
Optionally, valve positioner according to NAMUR can be mounted.
Designation: M02 M1 M2 M3 M4 M9 M10
Travel (mm)
20 20 20 30 30 60 60
No. of springs
63636612
Setting pressure (bar)
0,8-4,0 0,8-1,5 1,5-3,0 0,7-1,5 1,5-3,0 0,7-1,5 1,4-3,0
Max. Setting pressure (bar)
6666666
Spring pre-tensioning (KN)
0,72 1,5 3,1 2,1 4,2 5,0 10,0
Closing force (KN),
air-to-close at air
pressure
4,5 bar
3,5 9,5 4,7 7,5 3,5 10,3 20,6
6,0 bar
5,4 14,3 9,5 12,2 5,3 20,5 30,8
Designation: H1 H2
Travel (mm)
25 25
No. of springs
11
Max. Setting pressure (bar)
55
Spring pre-tensioning (KN)
1,9 3,4
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Modulating Valves Type: VSR
2. Technical Data
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2 . 8 Valve variants
Dosage valve
VSR type L,
Cone position: K1
Dosage valve with aseptic diaphragm
VSR Type L,
Cone position: K1
Steam modulating valve
VSR Type LS,
Cone position: K1
Cone position: K2
In this position the direction of effect of
the cone is the opposite to that of K1
(change in flow direction!).
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Modulating Valves Type: VSR
2. Technical Data
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Mixing valve
VSR Type LLD,
Cone position: K3
Distribution valve
VSR Type LLD,
Cone position: K4
Pressure reducing valve
VSR Type LID,
Cone position: K5
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Modulating Valves Type: VSR
3. Functional description
9
3. Functional description
The GUTH modulating valve VSR with multi-spring diaphragm actuator has a travel (stroke) of 20,
30 or 60 mm as standard for the nominal diameters DN 10 to DN 150. The linear movement of the
valve spindle is induced by means of an actuator shaft connected by a coupling piece. The diaphragm plate moves axially on account of the overpressure in the pressure chamber of the diaphragm actuator. It moves until the pressure of the compressed air on the one side is in equilibrium
with the spring load on the other side. The travel of the diaphragm plate is approximately proportional to the air pressure present, assuming that the spring has a linear characteristic curve. The air
pressure is dependent on the amount of air introduced into the pressure chamber. The principle of
operation of the valve positioner involves controlling the air supply or extraction of air by means of
a control piston. It is always possible to work with the maximum air flow rate (flow volume).
There are one or more control cones on the valve spindle that are supported by a metal seat ring.
Depending on the direction of operation of the diaphragm actuator, the spindle is either completely
raised or completely lowered when the pressure chamber is completely void. In this state, the diaphragm plate lies flush against the housing, or another limit point has been reached in the valve
housing, i.e. cone seat. However, when a cone is flush on its seat ring, it is held against it by the
pre-tensioning force.
The control cones (parabolic cone) have an exactly computed form that determines the free crosssection in the ring gap in dependency on the length of travel. Depending on the flow rate reference
for the valve, the so-called Kvs value, and the desired characteristic curve as a function of the length
of travel and flow volume, different cone forms are needed. Normally, so-called linear or equal-percentage characteristic curves are used, see Figure 8. For the purpose of throttling media where
there is a high differential pressure between the inlet and outlet sides, special cone and housing
shapes are used, so-called multi-stage modulating valves.
For optimal regulation characteristics, the direction of flow must always be towards the pointed end
of the control cone.
The standard modulating valves are fitted with metal seat seals.
In this connection it should be borne in mind that leakage according to VDI/VDE 2173, and EN
1349/ IEC 60534-4 of leakage class 4 are permissible.
This means that, in view of the less stringent leakage class, modulating valves with metal seat seals
may not also be used as shut-off valves.
If more stringent leak flow restrictions are required, GUTH modulating valves with elastomer seat
seals can be used. In this case, elastomer seat rings are chambered without gaps by means of
dividing the cone in two.
As standard, the spindle seal is provided by an O-ring placed close to the product and open to flushing via a generously dimensioned gap. This represents a sensible compromise in respect of
hygiene aspects and the service life of this functional element. A second O-ring towards the spindle
seal prevents the ingress of foreign substances from outside.
Linear characteristic curve Equal-percentage characteristic curve
Diagram. 1
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