OMB API 602 User manual

REF. NMROBFORGE
INSTRUCTIONS DE MONTAGE ET MAINTENANCE ROBINET FORGE
Sferaco 90 rue du Ruisseau 38297 St Quentin Fallavier Tél : [phone] Fax : [phone] Internet : www.sferaco.fr E-mail : [e-mail]
Date : 08/20 Rev.0
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Informations données à titre indicatif et sous réserve de modifications éventuelles
INSTRUCTIONS DE MONTAGE ET DE MAINTENANCE
REGLES GENERALES :
•Bien vérifier l’adéquation entre le robinet et les conditions de service réelles (nature du fluide, pression et
température)
•Prévoir suffisamment de robinets pour pouvoir isoler les tronçons de tuyauterie pour faciliter l’entretien des
matériels.
•Vérifier attentivement que les robinets installés soient conformes aux différentes normes en vigueur.
INSTRUCTIONS DE MONTAGE :
•Avant la mise en place des robinets, les tuyauteries doivent être nettoyées soigneusement afin d’éliminer
tous objets divers (particulièrement les gouttes de soudures et copeaux métalliques) qui pourraient
encombrer les tuyauteries et endommager les portées d’étanchéité des robinets.
•Vérifier l’alignement des tuyauteries amont et aval ( un alignement imparfait peut entraîner une contrainte
importante sur la robinetterie).
•Bien vérifier l’encombrement entre les tuyauteries amont et aval, la robinetterie n’absorbera les écarts. Les
déformations résultant de cette pratique peuvent entraîner des problèmes d’étanchéité, des difficultés de
manœuvre et même des ruptures. En conséquence, présenter l’appareil en position pour bien vérifier les
conditions d’assemblage.
•Avant l’assemblage vérifier la propreté des embouts.
•Lors de l’opération de soudure des vannes pour les modèles SW ouvrir partiellement les robinets.
•Pour les assemblages soudés la température dans la zone du siège ne doit pas dépasser 350 à 400 °C.
•Les longueurs de taraudage étant le plus souvent plus petites que les longueurs théoriques ISO/R7, il est
indispensable de limiter la longueur filetée du tube et de bien vérifier que l’extrémité du tube ne vient pas
buter en fond de filet.
•L’étanchéité des raccordements taraudés doit se faire avec des produits compatibles aux conditions de
service.
•Ne jamais serrer le corps des robinets dans un étau.
•Caler provisoirement les tronçons de tuyauterie qui non pas encore leur support définitif. Ceci afin d’éviter
des contraintes importantes sur la robinetterie.
•Le nombre et la solidité des supports doivent être calculés pour éviter en fonctionnement toutes
surcharges sur la robinetterie.
•Des éléments de compensation de dilatation doivent être mis en place afin d’éviter toutes contraintes sur le
robinet dues aux variations dimensionnelles résultantes des changements de température.
•Un resserrage en fonctionnement des presse-étoupes peut être nécessaire en fonction de conditions de
service (resserrage à chaud).
•Lors de la fermeture des robinets ne jamais utiliser d’outil augmentant le couple exercé sur les volants (clé
à volant ou rallonge).
•Les fluides transportés doivent être exempts de particules solides pouvant endommagées les sièges et
nuire à l’étanchéité.
•Pour le cas d’un montage en Zone ATEX, s’assurer de la continuité électrique entre le robinet, la tuyauterie
amont et aval (à l’aide d’une tresse métallique si besoin) et vérifier que la tuyauterie soit reliée à la terre.
MAINTENANCE :
•Il est recommandé de faire une manœuvre complète (ouverture, fermeture) de la vanne 1 à 2 fois par an.
•Lors d’une intervention sur la vanne, s’assurer que la tuyauterie n’est plus sous pression, qu’il n’y a plus
d’écoulement dans la tuyauterie, que celle-ci est isolée. Vidanger tout fluide dans la tuyauterie. La température
doit être suffisamment basse pour effectuer l’opération sans risque. Si le fluide véhiculé est corrosif, inerter
l’installation avant intervention.

OMB Valves S.p.A. Forged steel GATE, GLOBE & CHECK Valves Installation, Operation and Maintenance Manual Rev.5- 2016
Via Europa,7 Cenate Sotto 24069 (BG) Italy Tel: [phone]Fax: [phone] www.ombvalves.com
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FORGED STEEL GATE, GLOBE & CHECK VALVES, API 602
INSTALLATION, OPERATION AND MAINTENANCE MANUAL
TABLE OF CONTENTS:
SECTION A: SAFETY INSTRUCTIONS & WARNINGS
SECTION B: GENERAL VALVE OPERATION INFORMATION
SECTION C: HANDLING AND STORAGE
SECTION D: INSTALLATION AND MAINTENANCE
SECTION E: BOLTING SEQUENCES AND TORQUE VALUES
SECTION F: OMB SUPPORTING PROCEDURES & STANDARDS

OMB Valves S.p.A. Forged steel GATE, GLOBE & CHECK Valves Installation, Operation and Maintenance Manual Rev.5- 2016
Via Europa,7 Cenate Sotto 24069 (BG) Italy Tel: [phone]Fax: [phone] www.ombvalves.com
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All the information contained in this manual is the property of OMB Valves S.p.A. any use of the
drawings, photographs, procedures or instructions, either expressed or implied, is forbidden without
the official authorization of OMB Valves S.p.A headquarter.
IN ACCORDANCE TO LAW N. 257 OF 12 MARCH 1992, ALL VALVES MANUFACTURED BY OMB
VALVES S.P.A (OR PROVIDED BY OMB VALVES S.P.A. PLANTS LOCATIONS) ARE WITHOUT ANY
ALTERATIONS AND CONTAIN ONLY ORIGINAL SPARE PARTS, AND DO NOT CONTAIN ANY
HAZARDOUS MATERIAL.OMB VALVES ARE MADE SOLELY FROM ENVIRONMENTALLY FRIENDLY
MATERIALS. AFTER VALVES LIFE CYCLE OPERATION, THE VALVES CAN BE FULLY RECYCLED AS
METAL WASTE.

OMB Valves S.p.A. Forged steel GATE, GLOBE & CHECK Valves Installation, Operation and Maintenance Manual Rev.5- 2016
Via Europa,7 Cenate Sotto 24069 (BG) Italy Tel: [phone]Fax: [phone] www.ombvalves.com
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SECTION A
SAFETY INSTRUCTIONS & WARNINGS

OMB Valves S.p.A. Forged steel GATE, GLOBE & CHECK Valves Installation, Operation and Maintenance Manual Rev.5- 2016
Via Europa,7 Cenate Sotto 24069 (BG) Italy Tel: [phone]Fax: [phone] www.ombvalves.com
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•Please read these safety warnings, cautions, and Instructions carefully before using the product. These
instructions cannot cover every installation and situation. For more specific information, please ask for OMB
supporting procedures.
•Do not install, operate, or maintain these products without being fully trained and qualified in valve, and
accessory installation, operation, and maintenance.
•To avoid personal injury or property damage, it is important to carefully read, understand, and follow all of the
contents of the associated instruction manual, including all safety cautions and warnings.
•If you have any questions concerning installation, or use of this product, contact OMB Customercare Service
before proceeding.
•These valves are intended for a specific range of service conditions‐‐pressure, pressure drop, process and
ambient temperature, temperature variations, process fluid, and possibly other specifications. Do not expose
the product to service conditions or variables other than those for which the valves were intended to be used.
•If you are not sure what these conditions or variables are, contact OMB Customercare Service for assistance.
Provide the Valve Code, Job No. and all other relevant information that you have available.
•All valves must be inspected periodically and maintained as required. The schedule for inspection can only be
determined based on the severity of your service conditions. Your installation might also be subject to inspection
schedules set by applicable governmental codes and regulations, industry standards, company standards, or
plant standards.
•In order to avoid increasing dust explosion risk, periodically clean dust deposits from all equipment. When
equipment is installed in a hazardous area location, prevent sparks by proper tool selection and avoiding other
types of impact energy.
•Proper care must be taken to avoid generation of static electricity on the non-conductive external surfaces of
the equipment.
•Whenever ordering spare parts for each valves, always specify the serial number/CV code of the Valve and
provide all other relevant information that you can, such as product size, material, OMB Job. No, and general
service conditions.
GENERAL WARNINGS
SPARE PARTS WARNINGS

OMB Valves S.p.A. Forged steel GATE, GLOBE & CHECK Valves Installation, Operation and Maintenance Manual Rev.5- 2016
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•USE ONLY ORIGINAL OMB REPLACEMENT (SPARE) PARTS. COMPONENTS, THOSE ARE NOT
SUPPLIED BY OMB MUST NOT, BE USED IN ANY OMB PRODUCT, UNDER ANY CIRCUMSTANCES.
USE OF COMPONENTS NOT SUPPLIED BY OMB VOID YOUR WARRANTY, ALSO AFFECT THE
PERFORMANCE OF THE PRODUCT, AND COULD CAUSE PERSONAL INJURY AND PROPERTY
DAMAGE.
•Personal injury or equipment damage caused by sudden release of pressure or bursting of parts may result if
the valve assembly is installed where service conditions could exceed the limits given on the appropriate
nameplates, or the mating pipe flange rating.
•Use pressure‐relieving devices as required by government or relevant industry codes and good engineering
practices. If you cannot determine the ratings and limits for the valves, contact OMB Valves Customercare
before proceeding.
•To avoid personal injury, always wear protective gloves, clothing, and eyewear and/or every required PPE when
performing any installation operations.
•If lifting the valve, use a nylon sling to protect the surfaces. Carefully position the sling to prevent damage to
the actuator tubing and any accessories. Be sure to use adequately sized lift and chains or slings to handle the
valve.
•Personal injury could result from packing leakage. Valve packing was tightened before shipment; however, the
packing might require some readjustment to meet specific service conditions.
•When ordered, the valve configuration and construction materials were selected to meet particular pressure,
temperature, pressure drop and controlled fluid conditions. Responsibility for the safety of process media and
compatibility of valve materials with process media rests solely with the purchaser and end‐user.
•To avoid possible personal injury and because some valve/trim material combinations are limited in their
pressure drop and temperature ranges, do not apply any other conditions to the valve without first contacting
OMB Customercare Service.
•Ensure that the valve and adjacent pipelines are free of foreign material that could damage the valve seating
surfaces.
INSTALLATION WARNINGS

OMB Valves S.p.A. Forged steel GATE, GLOBE & CHECK Valves Installation, Operation and Maintenance Manual Rev.5- 2016
Via Europa,7 Cenate Sotto 24069 (BG) Italy Tel: [phone]Fax: [phone] www.ombvalves.com
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To avoid personal injury or property damage from sudden release of process pressure or bursting of
parts. Before performing any maintenance operations:
•Always wear protective gloves clothing, and eyewear and/or any required PPE.
•Disconnect any operating lines those providing air pressure, electric power, or a control signal to the actuator.
Be sure the actuator cannot suddenly open or close the valve.
•Completely shut off the process to isolate the valve from process pressure. Do not remove the actuator from
the valve while the valve is still pressurized.
•Relieve process pressure from both sides of the valve. Drain the process media from both sides of the valve.
•The valve-packing box might contain process fluids that are pressurized, even when the valve has been removed
from the pipeline. Process fluids might spray out under pressure when removing the packing hardware or
packing rings, or when loosening the packing box pipe plug. Cautiously remove parts so that fluid escapes
slowly and safely. This point is critical for very High Pressure Valves, class above 2500 and could cause injury,
damage or death
•Many valve parts those are moving can injure you by pinching, cutting, or shearing. To help prevent such injury,
stay away of any moving part.
•Never apply pressure to a partially assembled valve.
•To avoid personal injury or property damage caused by uncontrolled movement of a valve bonnet, loosen the
bonnet by following these instructions: Do not remove a stuck bonnet by pulling on it with equipment that can
stretch or store energy in any other manner. The sudden release of stored energy can cause uncontrolled
movement of the bonnet.
•As you remove parts, such as valve shafts, other parts, such as disks can fall from the valve body. To avoid
injury from falling parts, be sure to support parts as you disassemble the valve.
•Check with your process or safety engineer for any additional measures that must be taken to protect against
process media.
MAINTENANCE WARNINGS

OMB Valves S.p.A. Forged steel GATE, GLOBE & CHECK Valves Installation, Operation and Maintenance Manual Rev.5- 2016
Via Europa,7 Cenate Sotto 24069 (BG) Italy Tel: [phone]Fax: [phone] www.ombvalves.com
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OMB VALVES S.P.A warrants that the licensed embodied in the products will execute the valves manufactured by
OMB VALVES S.P.A, or services provided by OMB VALVES S.P. A, will be free from defects in materials or
workmanship, under normal use and care until the expiration of the applicable warranty period. Valves are
warranted for the agreed period of time between OMB and customer (written by OMB on contract). Buyer agrees
that OMB has no liability for Resale Products beyond making a reasonable commercial effort to arrange for
procurement and shipping of the Products. If buyer discovers any warranty defects and notifies OMB Valves
Customercare Service thereof in writing during the applicable warranty period, OMB shall correct any errors, repair
or replace those are found by OMB in the scope of services. All replacements or repairs necessitated by inadequate
maintenance, normal wear and usage, unsuitable power sources or environmental conditions, accident, misuse,
improper installation, modification, repair, storage or handling, or any other cause that is not the fault of OMB are
not covered by this limited warranty and shall be at purchaser’s expense. OMB shall not be obligated to pay any
costs or charges incurred by purchaser except agreed upon in writing in advance by OMB. All costs of dismantling,
re-installation, freight, the time and expenses of OMB’s Technicians and representatives for site travel, and diagnosis
under this warranty clause shall be paid by purchaser unless accepted in writing by OMB. This limited warranty is
the only warranty made by OMB valves S.p.A Headquarter and can be amended only in a writing signed by OMB.
THE WARRANTIES AND REMEDIES SET ABOVE ARE EXCLUSIVE. THERE ARE NO REPRESENTATIONS
OR WARRANTIES OF ANY KIND, EXPRESSED OR IMPLIED, FOR PARTICULAR PURPOSE OR ANY
OTHER MATTER WITH RESPECT TO ANY OF THE PRODUCTS OR SERVICES.
WARRANTY LIMITED

OMB Valves S.p.A. Forged steel GATE, GLOBE & CHECK Valves Installation, Operation and Maintenance Manual Rev.5- 2016
Via Europa,7 Cenate Sotto 24069 (BG) Italy Tel: [phone]Fax: [phone] www.ombvalves.com
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SECTION B
GENERAL VALVE OPERATION INFORMATION

OMB Valves S.p.A. Forged steel GATE, GLOBE & CHECK Valves Installation, Operation and Maintenance Manual Rev.5- 2016
Via Europa,7 Cenate Sotto 24069 (BG) Italy Tel: [phone]Fax: [phone] www.ombvalves.com
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1. INTRODUCTION AND THEORY OF OPERATION
Gate Valves: Gate valves are designed to close off or open up the flow in a pipeline. The wedge/Gate is designed
to stop flow completely and form a tight seal against pressure in either direction. The wedge is completely out of
the flow stream in the open position. Gate valves are not designed for throttling use.
Limitation:
•Not recommended to use for flow regulation or throttling.
•Must not use for slurries or fluids containing solids that can build up in valve cavities.
Globe Valves: Globe valves are designed to close off, open up or throttle the flow in a pipeline. The disc is designed
to stop flow completely and form a tight seal with pressure under the disc.
Limitation:
•Not use if full flow at minimal pressure drop is required.
•Must not be used for slurries or fluids containing solids that can build up in valve cavities.
Check Valves: Swing check valves are designed to open by the system pressure in a line. The normal direction of
flow in the line will open the valve, and any attempt by the flow to reverse will close the valve completely. The
check valve typically does not require any outside force or signal to operate properly. Check valves allow flow in
one direction only.
Limitation:
•Must be installed the same direction that shows with an arrows on the body.
•Must not be used for slurries or fluids containing solids that can build up in valve cavities.
2. PRESSURE AND TEMPERATURE RATING
Pressure and temperature rating of the valve shall be properly selected for the service requirement. Valves shall
not be used for different services than specified on purchasing order at first place.
FOR ANY UNCLEAR INFORMATION IN THIS MANUAL PLEASE CONTACT OMB VALVES
CUSTOMERCARE DEPARTMENT FOR ASSISTANCE:
EMAIL: [e-mail]
TEL: [phone]
OMB VALVES S.P.A TECHNICAL SUPPORT TEAM INCLUDES EXPERIENCED ENGINEERS AND
TECHNICIANS , PROFESSIONALLY TRAINED AND HIGHLY QUALIFIED TO OPERATE ON-SHORE
AND OFF-SHORE SERVICES. OUR STAFF ARE READY AND AVAILABLE IN OMB VALVES S.P.A
HEADQUARTER TO BE PRESENT IN YOUR SITE AND PROVIDE REQUIRED TECHNICAL SERVICE
AND INFORMATION TO PROTECT YOUR SYSTEM.

OMB Valves S.p.A. Forged steel GATE, GLOBE & CHECK Valves Installation, Operation and Maintenance Manual Rev.5- 2016
Via Europa,7 Cenate Sotto 24069 (BG) Italy Tel: [phone]Fax: [phone] www.ombvalves.com
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If system testing will subject the valve to a pressure in excess of its working pressure rating , then the intended
testing pressure and a statement explaining whether the test pressure is through the opened valve or a differential
across the closed valve, should be noticed to OMB in advance at the time of purchasing.
Note: Ask OMB Customercare for valves pressure/temperature rating.
3. FIRE SAFETY
All metal-to-metal seat OMB gate, globe and check valves are inherently fire-safe design and come standard with
graphite packing and gasket.
Note: Customer should indicate on their purchasing order when requires fire-safe design.
4. THROTTLING SERVICE
Valves used to control the rate of fluid flow subject to severe fluid turbulence, which can have the effect of creating
a high-energy conversion within the valve and piping system. This energy conversion is usually indicated by high
noise levels. The possibility exists for mechanical damage to the valve and piping system. OMB S.p.A should be
consulted on proper valve selection for throttling applications.
5. TEMPERATURE CHANGES
Forged steel expands with rising temperatures and contracts with falling temperatures. In general, increasing
temperature causes a decrease of mechanical strength, which is regained on return to a lower temperature. A
condition of non-uniform temperature in a structure may cause significant thermal stresses or distortion with
possible adverse effect on valve performance.
6. TRAPPED PRESSURE
When a closed valve containing liquid is heated (e.g., from process Condition, radiation or solar heating) the cavity
pressure will increase due to volumetric expansion or vaporization of the liquid. Conversely, cooling an un-drained
cavity below the freezing point may also result in volumetric expansion of the media. These expansions can result
in extremely high pressures occurring in the valve.
7. MATERIAL COMPATIBILITY
It is important that Forged steel valves and lubricants be chemically compatible with the other piping system
components, line fluids and the environment. Guidance should be obtained from OMB Customercare Service
whenever there appears to be reason for such concern.

OMB Valves S.p.A. Forged steel GATE, GLOBE & CHECK Valves Installation, Operation and Maintenance Manual Rev.5- 2016
Via Europa,7 Cenate Sotto 24069 (BG) Italy Tel: [phone]Fax: [phone] www.ombvalves.com
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8. IDENTIFICATION
All OMB valves are identified with metal tag that is attached to the handwheel include all identification details such
as Identification Number, Marking, Size, Pressure Class and material and OMB Job. No to be referred during
maintenance or ordering spare parts.

OMB Valves S.p.A. Forged steel GATE, GLOBE & CHECK Valves Installation, Operation and Maintenance Manual Rev.5- 2016
Via Europa,7 Cenate Sotto 24069 (BG) Italy Tel: [phone]Fax: [phone] www.ombvalves.com
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SECTION C
HANDLING AND STORAGE

OMB Valves S.p.A. Forged steel GATE, GLOBE & CHECK Valves Installation, Operation and Maintenance Manual Rev.5- 2016
Via Europa,7 Cenate Sotto 24069 (BG) Italy Tel: [phone]Fax: [phone] www.ombvalves.com
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1. HANDLING
OMB valves shall be handled in appropriate way and with care to avoid any damages. Valves shall not to be thrown
or dropped; handwheel and stems, in particular, should not be used as lifting or rigging points for valves.
Note: It is highly recommended to keep them in the shipping containers before the valves are to be installed.
Note:For any doubts, ask OMB Customercare Service support. Damaged or imperfection valves due to the
inappropriate storage process will not be under cover of OMB warranty.
2. STORAGE
To care the valve between the times it received in the site and installed on the system. Indoor-Storage of valves is
always recommended.
•Valves must be protected from rain and snow whilst moving to storage area.
•Valve end protectors should not be removed unless necessary for inspection and installation.
•Storage building must be provided by weather control, heating, cooling, temperature and humidity control.
•Valves must be placed on pallets to permit air circulation but they must not exposure to outside environment,
dust, physical damage and forces.
•Storage area must be fire-resistant, ventilated and drained equipped and not subjected to flooding.
OMB Supporting Procedures:
PCQ0110100 - Long-Term/Short Term Indoor storage procedure
PCQ0110200 - Long-Term/Short Term Outdoor storage procedure

OMB Valves S.p.A. Forged steel GATE, GLOBE & CHECK Valves Installation, Operation and Maintenance Manual Rev.5- 2016
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SECTION D
INSTALLATION AND MAINTENANCE

OMB Valves S.p.A. Forged steel GATE, GLOBE & CHECK Valves Installation, Operation and Maintenance Manual Rev.5- 2016
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WARNINGS
REPAIRING THE VALVES ON THE FIELD WITHOUT OMB AUTHORIZATION AND/OR OMB TECHNICAL
ASSISTANCE AND SPECIFIC SPARE PARTS WILL NOT COVER BY WARRANTY AND OMB IS NOT
RESPONSIBLE FOR CONSEQUENTIAL DAMAGES.
•No alteration or modification should be made to any OMB valve, except as sanctioned and/or authorized by
OMB S.P.A.
•Only qualified and experienced person must carry out operation.
•Personal protective equipment (PPE) must be worn during maintenance process.
•Installation, operation and maintenance of valves may involve proximity to fluids at extreme pressures and
temperatures; every precaution should be taken into attention to prevent injury to personnel during the
performance of any procedure consequently.
•Valves must NOT be installed immediately after welding. Shall wait until they completely cool down.
•Special knowledge of design and material is required for Oxygen service operation to prevent serious injury, or
property damage.
•Before connecting valves to the source service, ensure existing pressure in the line is no greater than the
maximum rated pressure of the valve.
•DO NOT attempt to remove the body-connectors bolts while the valve is under pressure.
•Ensure pressure of the system is completely released before tightening fittings.
•In case of leakage or malfunctioning, valves must be taken out of service immediately.
•Before starting maintenance process, ensure that the actuator (if any) is not connected to the electrical or
pneumatic line.
•Bill of material and assembly drawing is required in advance of maintenance procedure.
•Maintenance instruction must be followed properly to avoid valve damage and personal injury.
•All valve parts and components must be free from dirt or dust in advance of assembly process.
•Before valves disassembly make sure, there is no pressure in the line and/or that the parts to be disassembled
will not damage the line in any way.
•When fitting Threaded End valves into the line, never hold either the HandWheel or the yoke whilst screwing
in and tightening, always hold the BODY.

OMB Valves S.p.A. Forged steel GATE, GLOBE & CHECK Valves Installation, Operation and Maintenance Manual Rev.5- 2016
Via Europa,7 Cenate Sotto 24069 (BG) Italy Tel: [phone]Fax: [phone] www.ombvalves.com
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•Improper repairs can cause damage and personal injury or death.
•Disconnect the actuator (if any) from any electrical/pneumatic/hydraulic lines to avoid accidental operation of
the actuator. (For any actuator disassembly, please follow the actuator manufacturer’s instructions and in case
of any doubts ask for technical assistance.)
1. INSPECTION
•Nameplate specifications and all attached documents must be checked to be matched with ordered valve
description in advance of installation. DO NOT install, or attempt to use, any valve that is not properly identified
with material and pressure class.
•Ensure bolts and nuts and hand wheels are not over tightened and are as specified torque value at section E
of this manual, to avoid leakage, damage and personal injury.
•Visual inspection of the valve to ensure it is free from any surface damage or possible damages cause by
transportation.
•Inspect both ports to be completely clean and free from any obstruction, dirt, rust, sandblast or foreign/residual
material, which can cause damage or seat leakage.
•DO NOT change the valve position from open to close before being sure that it’s bore is completely cleaned,
otherwise, it may damage to the valve seat.
•Remove the end caps only when ready for installation. (Remove caps before placing the valve in line).
•Ensure the valve is installed in accessible location for any further operative action on it.
•For valve with gear, correct gear material must be selected regarding the environmental operation condition.
(offshore/onshore)
•Properly installed valves in constant use for particular service application are expected to have a long service
life if adequate attention given to the specific components and parts in finish surfaces for proper operation and
maintenance of valves throughout their service life. Under normal conditions, maintenance is limited to the
complete replacement of the packing and gasket during the life of the valve whenever the valve has been
disassembled. However sometimes it is necessary to repair or replace valve internals.
2. TOOLS FOR MAINTANANCE
Standard tools and appropriate wrench for removal or replacement of seats are required for valve repair or
maintenance.

OMB Valves S.p.A. Forged steel GATE, GLOBE & CHECK Valves Installation, Operation and Maintenance Manual Rev.5- 2016
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3. ROUTINE MAINTENANCE
Inspection of the functionality of installed valves in one position by controlling lubrication, stem packing and stem
threads, bonnet joint, seat and the end connections, surface corrosion of moving parts, leakage (especially on check
valves), stem seals for high pressure and temperature operated valves. To avoid any possible malfunctioning of
the installed valves, it is highly recommended to do the inspection every 2 days, or maximum every 2 months.
4. LUBRICATION
The valves are supplied with the stem threads engaging the yoke nut greased with BLASOLUBE 301 (see the SMDS
on OMB web site (www.ombvalves.com) or equivalent grade. These components should be kept constantly
lubricated, maximum every 2 months by applying the grease directly on the stem when the valve is in the open
position or through the grease injector in the yoke nut when provided.
5. DIRECTION
Check and Globe valves are supplied with an arrow stamped on the body, which indicates flow direction. While
ensured the inlet end is fitted against line pressure; the direction arrow may be embossed or stamped on the valve
body. Cryogenic Gate Valves are unidirectional due to the hole drilled on upstream side of gate. These valves are
supplied with HP marking on SS tag plate attached to the body, which indicates flow direction. When fitting ensure
inlet end is fitted against line pressure.
6. ACTUATOR SETTING INSTRUCTIONS
The torque and end- run micro switches and the various cabling setting must be in accordance with actuator
manufacturer instructions.
Horizontal Flow Direction
Vertical Flow Direction

OMB Valves S.p.A. Forged steel GATE, GLOBE & CHECK Valves Installation, Operation and Maintenance Manual Rev.5- 2016
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7. ASSEMBLY AND DISASSEMBLY
THREADED END VALVES:
•Threaded end valves are disassembled by loosening the thread bolt. (If permitted apply few drop of oil to
thread helps loosen the bolt).
•For Threaded End Valves, it is important to ensure about tight sealing.
•Thread connection on valve and pipe must be checked to be correct, clean and without any imperfection.
•Internal length of the thread in the valve end and its distance with the seat and plug must be considered
to avoid any possible damage could cause by pipe end to seat or wedge/disc whilst assembling.
•If no requirement for dry seal threading specified, using appropriate thread sealant tape or pipe dope or
compound is recommended.
•Thread must be accurately aligned at the point of assembly.
FLANGED JOINT VALVES:
•For Flanged Joint Valves, safe sealing depends on the tension created in fasteners which clamp the joint
components together , applied force must be great enough to resist failure of the seal but do not damage
the fasteners , joint components and gasket.
•Flange facing must be check to assure they are clean and free from radial groove cut or dent across the
face.
•Bolting size, length and material must be check.
•Gasket material must be checked, also ensure that they are free from any imperfection or damage.
•Flange to be assembled must be aligned correctly. It must be considered accurately parallel whilst the valve
is assembling into the system.
•Torque wrench shall be used for final tightening of flange bolting.
•Using torque wrenches is highly recommended to ensure the correct bolt tightening and loading.
WELDED END VALVES:
•All types of valves supplied by OMB and manufactured with Screwed Ends, Socket Weld Ends (S.W.E.), and
Butt Weld Ends (B.W.E.) have good welding properties.
•Welding end surface must be inspected before welding to be clean and have correct dimension.
•Socket weld and butt weld end valves shall be temporarily fitted in line, and the ends tack-welded to the
piping for alignment and adjustment of pipe and valve end.
•Socket weld valve should be lightly closed prior to welding. Welding should be done in horizontal or flat
position. If required vertical welding, upward progress should carry out.
•Carefully lift out the center section, making sure that the seats and body seals are held in position. Place
the center section in a clean area where it will not be damaged, and complete the welding of the end caps
to the piping.
•Weld thickness of Butt weld valves must be approximately equal to that of the pipe.
•Finished weld must be inspect and properly clean.

OMB Valves S.p.A. Forged steel GATE, GLOBE & CHECK Valves Installation, Operation and Maintenance Manual Rev.5- 2016
Via Europa,7 Cenate Sotto 24069 (BG) Italy Tel: [phone]Fax: [phone] www.ombvalves.com
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CAUTION 
OMB Supporting Procedure:
SV-014-PWHT API 602 Forges Steel Valves Procedure
•Before starting disassembly be sure enough, space is available to proceed the operation freely.
•Segregate different components in accordance with their materials of construction (metal, graphite, plastic,
electrical, etc.)
•Bodies, bonnets, wedges gland flanges and Handwheels are in forged steel materials, and the remaining
components such as stems, seats, glands and bolting are in steel bars.
•Gaskets and packings are composed of graphite or PTFE materials.
•Standard gaskets used in bolted bonnet valves are spiral wound type in stainless steel 316 and pure graphite.
•Standard packing is composed of a series of rings of pure graphite. The sets can be supplied with two anti-
extrusion rings, top and bottom, manufactured in braided graphite. Both internal and external rings are treated
with a passive corrosion inhibitor.
•Bonnet-type small valves are simply disassembled by unscrewing the union nut or bonnet.
•Bolted-bonnet valves are disassembled by removing bonnet nuts, stud bolts and/or turning cover/screw cap,
counter-clockwise until cap is removed.