INOXPA 74700 Manual

INSTALLATION, SERVICE AND
MAINTENANCE INSTRUCTIONS
OVERFLOW VALVE
INOXPA, S.A.
c/Telers, 54 Aptdo. 174
E-17820 Banyoles
Girona (Spain)
Tel. : (34) 972 - 57 52 00
Fax. : (34) 972 - 57 55 02
Email: [e-mail]
www.inoxpa.com
Original Manual
10.207.30.00EN_RevC
ED. 2010/11

Declaration of Incorporation
The manufacturer: INOXPA, S.A.
c/ Telers, 57
17820 Banyoles (Girona), Spain
herewith declares that the machine:
OVERFLOW valve 74700
with the serial number: ________________
conforms to the relevant provisions of the following directives:
Machinery Directive 2006/42/EC (RD 1644/2008)
Pressure equipment Directive 97/23/EC
It also declares that the technical documentation for this partly completed machinery has been developed in
compliance with Appendix VII Section B and it agrees to issue this documentation as and when required by the
national authorities.
In compliance with Regulation (EC) 1935/2004 on materials and articles intended to come into contact with food.
In compliance with Regulation (EC) 2023/2006 on good manufacturing practice for materials and articles intended
to come into contact with food.
The aforementioned partly completed machinery shall NOT be put into service until the final machinery into which
it is to be incorporated has been declared in conformity with the Machinery Directive, as required by Appendix II A.
Identification of the person empowered to draw up the Declaration on behalf of the manufacturer, and qualified to
compile the technical file established by the Community:
Banyoles, 8 January 2014
David Reyero Brunet
Technical Office Manager

ED. 2010/11 1.Safety 3
1.Safety
1.1. INSTRUCTION MANUAL.
This instruction manual contains basic indications which should be fulfilled during the installation, starting and maintenance.
The information published in the instruction manual is based on updated information.
INOXPA reserves the right to modify this instruction manual without prior notice.
1.2. START-UP INSTRUCTIONS.
This instruction manual contains essential useful information to handle and maintain your valve appropriately .
Not only should the safety instructions indicated in this chapter be observed and fulfilled, but so should the special measures
and recommendations included in the other chapters of this manual. These instructions should be kept in a safe location near
the installation.
1.3. SAFETY.
1.3.1. Warning symbols.
General danger of injury
Danger of injuries caused by the rotary
parts of the equipment
Electrical hazard
Danger! Caustic or corrosive agents.
Danger! Suspended loads
Danger for the correct operation of the
equipment.
Compulsory requirement to ensure safety
at work
Use of goggles is compulsory.
1.4. GENERAL SAFETY INSTRUCTIONS.
Read the instruction manual carefully before installing and starting up the valve. Contact INOXPA in
case of doubt
1.4.1. During the installation.
The Technical Specifications of Chapter 8 should always be observed.
The installation and use of the valve should always be carried out in accordance with applicable
regulations regarding health and safety.
Before starting up the valve, verify that the assembly is correct and that the shaft is perfectly
aligned. An incorrect alignment and/or excessive force in securing the valve may cause serious
mechanical problems in the valve.
1.4.2. During operation.
The Technical Specifications of Chapter 8 should always be observed. Under no circumstances can the
limit values specified be exceeded.
NEVER touch the valve and/or the tubes in contact with the liquid during operation. You risk being
burnt if you work with hot products.

4 1.Safety ED. 2010/11
The valve contains parts operating in linear movement. Do not place your hands or fingers in the
valve-closing area. This may cause serious injury.
1.4.3. During maintenance
The Technical Specifications of Chapter 8 should always be observed.
NEVER disassemble the valve until the pipes have been emptied. Bear in mind that the liquid in the
pipe may be dangerous or extremely hot. Consult the regulations in effect in each country for these
cases.
Do not leave parts loose on the floor.
All electrical work should be carried out by authorised personnel.
1.4.4. In compliance with the instructions.
Any non-fulfilment of the instructions may result in a risk for the operators, the environment and the machine, and may result
in the loss of your right to claim damages
This non-fulfilment may result in the following risks:
Failure of important functions of the machines/plant.
Failure of specific maintenance and repair procedures.
Possibility of electric, mechanical and chemical risks.
Will place the environment in danger due to the release of substances.
1.5. GUARANTEE.
Any guarantee will be cancelled immediately and as a matter of law and, in addition, we will require compensation for any
claims of civil liability presented by third parties, if:
The installation and maintenance work has not been carried out according to the instructions of this manual.
The repairs are not carried out by our personnel or have been carried out without our written authorisation.
The parts used are not INOXPA original parts.
Modifications have been carried out on our materials without written authorisation.
The material has been badly used, incorrectly used, or used with negligence or has not been used according to the
indications and intended use specified in this manual.
The general conditions of delivery already in your possession are also applicable.
Please do not hesitate to contact us in case of doubts or more complete explanations are required on specific data
(adjustments, assembly, disassembly, etc.).

ED. 2010/11 2.Table of contents 5
2.Table of contents
1. Safety 3
1.1. Instruction manual.........................................................................................................3
1.2. Start-up instructions.......................................................................................................3
1.3. Safety...........................................................................................................................3
1.4. General safety instructions..............................................................................................3
1.5. Guarantee.....................................................................................................................4
2. Table of contents 5
3. Receiving and Installation 6
3.1. Check the shipment .......................................................................................................6
3.2. Delivery and unpacking ..................................................................................................6
3.3. Identification .................................................................................................................6
3.4. Location........................................................................................................................7
3.5. Flow direction................................................................................................................7
3.6. Overflow valve position. .................................................................................................7
3.7. Assembly. .....................................................................................................................7
3.8. Inspecting and checking.................................................................................................8
3.9. Welding. .......................................................................................................................8
4. Star-up 9
4.1. Valve applications. .........................................................................................................9
4.2. Start-up. .......................................................................................................................9
4.3. Operation......................................................................................................................9
4.4. Valve calibration. ...........................................................................................................9
5. Operating problems Causes and solutions 10
6. Maintenance 11
6.1. General information .....................................................................................................11
6.2. Maintenance................................................................................................................11
6.3. Cleaning......................................................................................................................12
7. Assembly and disassembly 13
7.1. Disassembly / assembly of the overflowvalve fig: 74700..................................................13
7.2. Disassembly / assembly of the overflowvalve fig: 74700m. ..............................................14
8. Technical Specifications 16
8.1. Overflow valve dimensions............................................................................................17
8.2. Section and parts list....................................................................................................18
8.3. Parts lists ....................................................................................................................20

6 3.Receiving and Installation ED. 2010/11
3. Receiving and Installation
3.1. CHECK THE SHIPMENT
The first thing to do on receiving the valve is to verify that it is matches the delivery note.
INOXPA will inspect all the equipment before packing, although it cannot guarantee that the merchandise will arrive intact to
the user. For this reason, the valve received and any other article should be checked and, if it is found not to be in good
condition and/or not all parts are included, the carrier should submit a report as soon as possible.
Each valve has a manufacturing number engraved. Indicate the manufacturing number in all documents and correspondence.
3.2. DELIVERY AND UNPACKING
INOXPA will not be responsible for the inappropriate unpacking of the valve and its components.
3.2.1. Delivery:
Check that all the parts indicated in the delivery slip exist
Complete valve.
Its components (if supplied).
Delivery slip.
Instruction manual.
3.2.2. Unpacking:
Remove all traces of packing materials from the valve or parts.
Inspect the valve or its constituent parts for possible damage caused during transport.
Avoid any possible damage to the valve and its components.
3.3. IDENTIFICATION

ED. 2010/11 3.Receiving and Installation 7
The buyer or user will be responsible for the assembly, installation, starting and operation of the
valve.
3.4. LOCATION.
Place the valve in such a way as to facilitate inspections and checks. Leave sufficient space around the valve for appropriate
inspection, separation and maintenance (See Section 3.7.1).
3.5. FLOW DIRECTION.
The overflow valve is designed to be installed according to the indicated direction of flow.
3.6. OVERFLOW VALVE POSITION.
The overflow valve is designed to be installed in any position, although fitting it upside down is not recommended.
3.7. ASSEMBLY.
Once the location of the valve is established, the pipe can be connected by welding the body or by jeans of accessoriees
(unions). The overflow valve is designed to be installed in any position, although fitting it ápside down is not recommended.
Excessive stress should be avoided during the assembly of
the valves and special attention should be given to the
following:
Vibration which may be produced in the installation.
Expansion of the pipes during circulation of hot liquids.
The weight that the pipes can withstand.
Excessive intensity of welding.
Recommended
Not
recommended

8 3.Receiving and Installation ED. 2010/11
3.8. INSPECTING AND CHECKING
Check the following before use:
Check that the clamp and the adjusting nuts
are well tightened.
If it has a handle, turn it several times to
ensure that it works. (the seat of the valve
must lift and fall)
3.9. WELDING.
The welding work can only be carried out by people qualified, trained and equipped with the
necessary means to carry out this work.
Disassemble the valve before starting the welding work.
3.9.1. Welding ende overflow valve . 74700
Disassemble the valve as indicated in the Assembly and disassembly section.
Weld the valve body to the pipes.
When welding the valve body, it is very important to maintain the minimum distance (dimension A) enabling disassembly
of the valve for later checks and replacement of internal valve parts (seals, shafts, springs). This distance is also
important when the valves are supplied with a handle.
DN
A
No
handle
With
handle
25-1”
250
325
32
260
335
40-1 ½”
275
345
50-2”
300
360
65-2 ½”
355
425
80-3”
380
445

ED. 2010/11 4.Star-up 9
4.Star-up
The start-up of the valve can be carried out provided the instructions indicated in Chapter 3 – Receiving and Installation are
followed.
4.1. VALVE APPLICATIONS.
This equipment is suitable for his use in food process.
Overflow valves of type 74700 and 74700M are basically used to avoid any excessive pressure in the pipes, particularly in
positive-displacement pumps, in order to prevent any over-pressures that may damage the concerned equipment (bypass
assembly).
4.2. START-UP.
Before start-up, the responsible persons should be duly informed of the operation of the valve and
the safety instructions to be followed. This instruction manual should be available to personnel at all
times.
The following should be taken into consideration before starting up the valve;
Check that the pipe and valve are completely free from any traces of welding or other foreign matter. Carry out the
cleaning of the system if required.
Verify the smooth operation of the valve. If necessary, lubricate moving/rotating parts with special grease or soapy
water.
Check for possible leaks and check that all the pipes and connections are watertight and free from leaks
Actuate the valve (if supplied with a handle)
4.3. OPERATION.
Do not modify the operating parameters for which the valve has been designed without written prior
authorisation from INOXPA.
Danger of burns! Do not touch the valve or pipes when hot liquids are circulating or when cleaning
and/or sterilisation are being carried out.
4.4. VALVE CALIBRATION.
The overflow valve can be shipped pre-calibrated in factory, provided this has been requested in writing on the order.
Overflow valve calibration is carried out using a bypass-type assembly (flow recirculation). To carry out the calibration, it is
necessary to use a pump, a gauge (for pressure measurements), a shut-off valve and the overflow valve.
Operate the pump with the shut-off valve in closed position. The flow will make the bypass (recirculation) by passing through
the overflow valve. Tighten the upper nut (first loosening the lock nut) of the overflow valve until the gauge shows that the
pump is at maximum working pressure. The overflow valve will remain calibrated to the pressure indicated on the gauge; if it
exceeds this pressure, then the overflow valve will open and make the flow recirculate preventing the installation from being
damaged.

10 5.Operating problems. Causes and solutions ED. 2010/11
5.Operating problems. Causes and
solutions
PROBLEM
CAUSE/EFFECT
SOLUTION
VALVE DOES NOT
CLOSE
Dirt / foreign matter between the seal of the shaft and the
seat of the valve body.
The springs are not applying pressure to the stop washer
of the shaft
The check valve seal is worn and defective.
Clean the body and seat.
Increase the tightening torque of
the springs.
Replace the seals.
INTERNAL LEAK OF
THE PRODUCT
(VALVE CLOSED)
Premature wearing of the seals.
Replace the seals.
Premature
wearing of
the seals.
Watertight seal worn or affected by the
product.
Excessive pressure in the line.
Working temperature too high
Loss of watertightness (vibration).
Replace the seals with others of
different material and more
appropriate to the product.
Tighten any loose components.
Clean frequently.
Backpressure
Replace the spring with a stronger
one.
EXTERNAL LEAK OF
THE PRODUCT
Seal of the body defective
Seal of the shaft defective
Replace the seals with new ones
VALVE DOES NOT
OPEN/CLOSE
Deformation of seat seal.
Spring in poor condition and/or jammed (dirtiness)
The valve does not close when the pressure increases.
Replace the seal seat with other of
different quality, if prematurely
deteriorated.
Replace spring and/or shaft
(clean).
Adjust the valve
Recalibrate the valve. See point
4.4 Valve calibration.