European Valve Service Center provides specialized maintenance, diagnostics, refurbishment, and on-site support for industrial valves and actuators operating in critical process environments across Europe, North Africa, and the Middle East.
Everything You Need to Know About NBS Valve Supply, Service and Technical Support in Europe
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Q: Who is BM TECH and what is your relationship with NBS Corporation?
BM TECH is the sole Authorized Representative of NBS Corporation (Japan) in Europe, the Middle East and North Africa. We have held this authorization since 2019. In June 2025, BM TECH became NBS Europe — the official European office of NBS Corporation — deepening the technical and commercial relationship between the two companies. This means that when you contact BM TECH, you are contacting NBS Corporation’s European presence directly — not a distributor or agent operating at arm’s length from the manufacturer.
Q: Where are you based and what geographic area do you cover?
BM TECH is based in Warsaw, Poland — ul. Ateńska 10/15, 03-978 Warsaw. We provide valve supply, technical support and on-site service across Europe, the Middle East and North Africa. For marine applications — LNG tankers, LPG tankers and chemical tankers — we provide service at European ports and can mobilise to vessel locations across our service area.
Q: What industries do you serve?
Our primary sectors are industrial gas production (PSA, VPSA, ASU), liquefied gas infrastructure (LNG terminals, LPG storage), marine (LNG tankers, LPG tankers, chemical tankers), oil and gas, petrochemical, power generation and steel works. We serve both plant operators and engineering contractors — from initial valve specification on new projects through lifecycle maintenance of operating installations.
Q: Are you able to support non-NBS valve brands as well?
Our primary focus is NBS UNIFLOW/UNICON valves, for which we hold exclusive European authorization and maintain original spare parts stock. We can provide technical consultation on general valve selection and service questions across valve types — and we supply NBS valves as replacements for other manufacturers’ valves that have reached end of service life in PSA, VPSA, ASU and liquefied gas applications.
Q: How long has NBS Corporation been manufacturing valves?
NBS Corporation has been manufacturing industrial valves in Japan for several decades, with the UNIFLOW and UNICON series developed specifically for high-cycle switching service in PSA, VPSA and ASU applications. NBS valves are installed in plants operated by Air Liquide, Air Products and Chemicals, Linde, Air Water, Taiyo Nippon Sanso and Daesung Industrial — representing continuous operational validation across multiple plant generations.
Q: What are NBS UNIFLOW and UNICON valves?
UNIFLOW and UNICON are NBS Corporation’s proprietary valve series developed for high-cycle switching service in PSA, VPSA and ASU industrial gas production plants. They are butterfly valves engineered specifically for the demanding duty of adsorption cycle switching — where a valve may complete hundreds of thousands to several million open-close cycles per year. The UNIFLOW and UNICON designs address the specific requirements of this duty: fast switching response, tight bidirectional shutoff, high-cycle seat durability and robust pneumatic actuation for continuous automated service.
Q: What is the difference between UNIFLOW and UNICON?
UNIFLOW and UNICON represent different configurations within the NBS high-cycle switching valve range — optimised for different pressure ratings, pipe sizes and cycle parameters. BM TECH’s technical team advises on the correct series selection based on your specific PSA, VPSA or ASU process parameters. Contact us with your cycle data and we will recommend the appropriate configuration.
Q: What sizes and pressure ratings are available?
NBS UNIFLOW/UNICON valves are available across a range of pipe sizes and pressure ratings suited to PSA, VPSA and ASU applications. Specific size and pressure data for your application is available from BM TECH on request — contact our technical team with your process parameters and we will provide the relevant specifications.
Q: Can NBS UNIFLOW/UNICON valves replace other manufacturers’ switching valves in my existing PSA plant?
In most cases, yes — subject to dimensional compatibility with the existing piping and actuator interface. BM TECH has experience in specifying NBS replacement valves for PSA plants originally equipped with other manufacturers’ switching valves. We require the existing valve dimensions, actuator interface data and process parameters to confirm compatibility and provide a replacement specification. Contact our technical team to initiate a replacement assessment.
Q: What actuator options are available for NBS valves?
NBS UNIFLOW/UNICON valves are supplied with pneumatic actuators as standard — spring-return or double-acting configurations depending on the fail-safe requirement of the application. Electric actuator options are available for specific applications. Actuator sizing is matched to the valve torque requirements at the specified operating pressure and cycle frequency. BM TECH specifies the correct actuator configuration for each application.
Q: Are NBS valves certified for oxygen service?
Yes. NBS valves for oxygen service are assembled under oxygen-clean conditions using compatible lubricants and materials, with documented cleanliness certification. Oxygen service certification documentation is available from BM TECH for valves supplied for oxygen PSA, ASU cold box and LNG/LPG applications where oxygen service requirements apply. Contact us for specific certification requirements applicable to your installation.
Q: How often should PSA switching valves be maintained?
PSA switching valve maintenance intervals should be based on cycle count — not calendar time. A valve completing 2,000 cycles per day reaches one million cycles in approximately 500 days. A valve on a slower cycle may reach the same milestone in three to four years. We recommend establishing maintenance intervals based on actual cycle count data from your plant control system, combined with valve condition monitoring data — product purity trend, vacuum level achievement in VPSA, cycle error frequency — rather than applying a fixed calendar interval that does not reflect actual valve duty.
Q: What are the signs that PSA switching valves need maintenance?
The primary indicators of PSA switching valve condition deterioration are gradual decline in product gas purity without corresponding changes in feed air or adsorbent condition, declining product recovery rate at constant feed flow and cycle parameters, increasing cycle error frequency in the plant control system, increasing compressed air consumption by pneumatic actuators, and — in VPSA installations — failure to achieve or maintain target vacuum level during regeneration. Any of these trends, particularly in combination, indicates that valve condition assessment and planned maintenance intervention are required.
Q: Can BM TECH service PSA valves on-site, or do valves need to be removed to your workshop?
Both options are available depending on the scope of maintenance required. Actuator inspection, seal replacement and functional testing can be carried out on-site without removing the valve from the pipeline. Seat inspection, disc condition assessment and seat replacement typically require valve removal — valves can be overhauled in our Warsaw workshop or, for larger installations, we can establish a temporary on-site workshop capability during planned maintenance shutdowns. We discuss the most appropriate approach with each customer based on their plant layout and maintenance window.
Q: What is the typical service life of NBS UNIFLOW/UNICON switching valves in PSA service?
Service life depends primarily on cycle frequency, operating pressure differential and process conditions. NBS UNIFLOW/UNICON valves are engineered for multi-million cycle service life — the specific number varies by application. BM TECH tracks cycle count data for customer valve populations where available and advises on expected remaining service life based on condition assessment findings. We recommend establishing a valve population management programme rather than waiting for individual valve failures to trigger replacement.
Q: What is the difference between PSA and VPSA valve service requirements?
The fundamental additional requirement in VPSA valve service is bidirectional sealing — VPSA switching valves must seal reliably against positive pressure during adsorption and against vacuum during regeneration. This places different demands on seat design and closing force compared to standard PSA valves that seal only against positive pressure. Additionally, VPSA installations include vacuum pump bypass valves — a specialised duty not present in conventional PSA — that require specific maintenance attention. BM TECH’s service programme for VPSA installations addresses both the switching valve population and the vacuum pump bypass valve duty.
Q: Do you stock NBS spare parts for PSA and VPSA valves?
Yes. BM TECH maintains stock of critical NBS UNIFLOW/UNICON spare parts for PSA and VPSA applications at our Warsaw facility — including actuator seals, seat assemblies and other high-wear components. Standard spare parts are available for rapid dispatch. We recommend that PSA plant operators maintain a local critical spare parts inventory on-site for immediate response to unplanned valve failures — BM TECH can advise on the appropriate critical spare parts list for your specific valve population.
Q: What makes ASU cold box valve service different from standard industrial valve maintenance?
ASU cold box valve service involves three requirements that do not apply in standard industrial valve maintenance: cryogenic material qualification, extended bonnet design integrity and — for oxygen service — oxygen cleanliness. Cold box valves operate continuously at temperatures between −150°C and −196°C. Materials that perform reliably at ambient temperature may become brittle at cryogenic temperatures. Extended bonnets must maintain a temperature gradient that keeps packing materials within their operating range. Valves in oxygen service must be maintained with oxygen-compatible lubricants and tools, and must be verified as clean to the required standard after maintenance. BM TECH service engineers are trained in all three of these requirements.
Q: When is the best time to inspect and service ASU cold box valves?
Cold box valve inspection and maintenance requires a planned ASU shutdown — the cold box must be warmed to ambient temperature before internal components are accessible. The best time to plan cold box valve maintenance is during the next scheduled ASU planned maintenance shutdown. BM TECH recommends contacting us at least three to six months before a planned ASU shutdown to allow time for valve condition assessment planning, spare parts procurement and service engineer mobilisation — ensuring that all required valve maintenance is completed within the planned outage window.
Q: How do I know if my ASU cold box valves need attention before the next planned shutdown?
Several performance parameters can indicate cold box valve condition deterioration without requiring a shutdown for inspection. Increasing heat leak into the cold box — indicated by rising liquid consumption in the refrigeration balance — may indicate valve seat leakage. Gradual product purity decline without adsorbent or feed air changes may indicate cross-contamination through leaking product line valves. Expansion turbine instability may indicate incorrect operation of turbine outlet or bypass valves. BM TECH can review your plant performance data and advise on whether observed trends indicate valve condition issues requiring priority attention at the next shutdown.
Q: Can you service ASU valves that were not originally supplied by NBS?
BM TECH’s primary expertise and spare parts stock is focused on NBS UNIFLOW/UNICON valves. For ASU installations equipped with other manufacturers’ valves, we can provide technical consultation and advise on NBS replacement specifications for valves approaching end of service life. For ongoing maintenance of other manufacturers’ valves, we recommend contacting the original manufacturer or their authorized service representative.
Q: What documentation do you provide for ASU oxygen service valve maintenance?
For ASU oxygen service valve maintenance, BM TECH provides a maintenance record documenting the work carried out, components replaced, lubricants used, cleanliness verification and pressure test results. This documentation supports the plant’s quality management system records and provides the evidence trail required for insurance and regulatory compliance purposes. Material certificates for replacement components are provided on request.
Q: What regulatory requirements apply to LNG and LPG valve maintenance?
Shore-based LNG terminals and LPG storage facilities in Europe are subject to the Pressure Equipment Directive (PED 2014/68/EU), which requires CE-marked pressure equipment with full documentation. LNG and LPG tankers are subject to the International Gas Carrier Code (IGC Code) — administered by the IMO — which defines cargo valve specifications, ESD system requirements and materials standards. Marine classification society rules (Lloyd’s Register, DNV GL, Bureau Veritas, ClassNK and others) define additional requirements for valve materials, testing and certification on vessels under their class. BM TECH supplies NBS valves with the documentation required for each applicable regulatory framework and supports classification society surveys.
Q: How do you support LNG/LPG tanker valve maintenance during drydock?
BM TECH provides a coordinated drydock valve service programme — advance spare parts supply to the drydock location, pre-mobilisation of service engineers, condition assessment of the full cargo valve population, overhaul and replacement as required, actuator testing, remote operation verification, ESD valve testing and full documentation for classification society survey. We recommend initiating drydock planning contact with BM TECH at least four to six months before the scheduled drydock date to allow adequate preparation time.
Q: What is partial stroke testing for ESD valves and why is it required?
Emergency shutoff valves on LNG and LPG tankers and terminals must be tested periodically to verify that they will function correctly on demand — closing within the required time when an emergency signal is received. Full stroke testing — closing the valve completely — interrupts cargo operations and is typically only possible during planned shutdowns. Partial stroke testing operates the valve through a partial travel — typically 10 to 15 percent of full stroke — sufficient to verify that the actuator is functioning and the valve is not seized, without interrupting normal operations. BM TECH provides partial stroke testing services for NBS ESD valves aboard vessels at European ports, with test documentation supporting classification society records.
Q: Can BM TECH service LNG valves at our terminal during operation, or is a plant shutdown required?
It depends on the valve location and duty. Product line and utility valves that can be isolated and bypassed are accessible for maintenance during plant operation without a full shutdown. Storage tank isolation valves and cold box valves typically require a planned maintenance shutdown for access. BM TECH discusses the maintenance scope and access requirements with each terminal operator to plan the most efficient maintenance programme — minimising the impact on terminal operations while ensuring that all required valve maintenance is completed.
Q: Do you provide emergency response for LNG/LPG valve failures?
Yes. Valve failures in LNG and LPG service require immediate response — the consequences of delayed repair in flammable cryogenic service are not acceptable. BM TECH provides emergency response service across our European service area — rapid mobilisation of service engineers and expedited spare parts supply. Contact our emergency line at +48 695 557 331 for urgent service requests.
Q: How do you verify that NBS valve materials are compatible with the cargoes on our vessel’s Certificate of Fitness?
BM TECH maintains chemical compatibility data for NBS UNIFLOW/UNICON valve materials — body alloys, seat compounds and seal elastomers — against the chemical properties of cargoes listed in the IBC Code and commonly carried on chemical tankers. When a compatibility assessment is required — for a new vessel, a cargo list change, or a valve replacement — we review the proposed cargo list against the NBS valve material data and provide a documented compatibility assessment. Where standard configurations are not compatible with specific cargoes, we identify alternative seat and seal materials that provide the required compatibility.
Q: How frequently should chemical tanker cargo valves be maintained?
The IBC Code and classification society rules define minimum survey and maintenance requirements for cargo valves. Beyond these regulatory minima, BM TECH recommends that cargo valve condition — particularly seat leakage and remote operation function — be verified at each drydock and that remote-operated and ESD valves be exercised periodically between drydocks to prevent seizure. Pump room valves that are infrequently operated should be exercised on a defined schedule — typically quarterly — to verify operability before they are needed in service.
Q: Can you provide valve service in European drydocks?
Yes. BM TECH provides on-site valve service in European drydock facilities — mobilising service engineers to the drydock location with the tools, equipment and spare parts required for the planned valve maintenance scope. We have experience coordinating chemical tanker drydock valve programmes alongside hull, machinery and other shipboard maintenance activities — working within the overall drydock schedule to complete valve maintenance within the planned outage window.
Q: What documentation do you provide for classification society survey?
BM TECH provides a complete valve maintenance documentation package for classification society survey — including valve condition assessment findings, maintenance records, component replacement records with material certificates, pressure test records, remote operation test records and ESD valve test records. This documentation is prepared in the format required by the relevant classification society and supports the surveyor’s inspection of the cargo valve system.
Q: Our vessel carries ethylene oxide — what specific valve requirements apply?
Ethylene oxide is one of the most demanding chemical tanker cargoes from a valve engineering perspective — it is toxic, highly reactive and subject to specific IBC Code requirements including temperature control, inhibitor management and emergency venting provisions. Valve materials must be compatible with ethylene oxide at the specified cargo temperature and must provide the tight shutoff required to prevent vapour migration into adjacent spaces. BM TECH can provide a specific valve compatibility assessment for ethylene oxide service and advise on any configuration modifications required for NBS valves in this service. Please contact our technical team directly for ethylene oxide cargo valve consultation.
Q: What valve types does BM TECH service?
BM TECH supplies and services the full range of industrial valve types used in our primary sectors — ball valves, butterfly valves, globe valves, gate valves, check valves, control valves, safety and relief valves, cryogenic valves, plug valves, needle valves, knife gate valves and pressure reducing valves. Our primary focus is NBS UNIFLOW/UNICON high-cycle switching valves for PSA, VPSA and ASU service, and NBS cryogenic valves for LNG, LPG and ASU cold box applications.
Q: Do you provide on-site service or only workshop repair?
Both. BM TECH service engineers carry out on-site inspection, maintenance and commissioning across our European service area. Our Warsaw workshop handles valve overhaul, pressure testing and certification for valves that require removal from service for repair. For large installations or extended maintenance shutdowns, we can establish on-site workshop capability at the customer’s facility.
Q: How quickly can you respond to an emergency valve failure?
Response time depends on location and the nature of the failure. For valve failures requiring spare parts, we maintain critical spare parts stock at our Warsaw facility for rapid dispatch. For on-site service, we can typically mobilise a service engineer within 24 to 48 hours for locations within Central Europe — contact us directly at +48 695 557 331 to discuss the specific situation and agree a response plan.
Q: Do you offer preventive maintenance contracts?
Yes. BM TECH offers structured preventive maintenance programmes for PSA, VPSA and ASU installations — covering scheduled valve inspection, condition assessment, planned maintenance and critical spare parts management. Maintenance intervals are established based on cycle count data and valve condition assessment findings rather than generic calendar schedules. Contact us to discuss a preventive maintenance programme tailored to your installation.
Q: Can you help us establish a critical spare parts inventory for our plant?
Yes. BM TECH advises customers on critical spare parts inventory for NBS UNIFLOW/UNICON valve populations — identifying the components most likely to require replacement within a given maintenance interval and recommending stock quantities based on valve population size, cycle frequency and acceptable response time for unplanned failures. Having the right spare parts on-site at the point of failure is the single most effective measure for reducing unplanned downtime in PSA and VPSA installations.
Q: Do you provide valve training for our maintenance team?
Yes. BM TECH provides technical training for customer maintenance teams on NBS UNIFLOW/UNICON valve inspection, maintenance procedures and condition monitoring — covering valve disassembly, component inspection, reassembly, testing and the performance parameters to monitor between maintenance interventions. Training can be delivered at our Warsaw facility or at the customer’s site. Contact us to discuss training requirements and scheduling.
Q: Are NBS spare parts available from stock in Europe?
Yes. BM TECH maintains stock of critical NBS UNIFLOW/UNICON spare parts at our Warsaw facility — including actuator seal kits, seat assemblies, disc components and other high-wear parts for the most common valve configurations in PSA, VPSA and ASU service. Standard spare parts are available for dispatch within one to two business days. For parts not held in our European stock, we source directly from NBS Corporation in Japan — lead times vary depending on the specific part and production schedule.
Q: How do I order spare parts for my NBS valves?
Contact BM TECH with the valve model number, serial number (if available), the part description or part number from the NBS maintenance manual, and the quantity required. Our team will confirm stock availability, lead time and price and process your order. For urgent requirements, please indicate this clearly and we will prioritise accordingly.
Q: Can you supply spare parts for NBS valves installed many years ago?
NBS Corporation maintains spare parts availability for its valve product range over an extended period. Contact BM TECH with the valve identification data — model number, serial number and year of manufacture if known — and we will confirm spare parts availability and lead time. For very old installations where original parts are no longer available, we can advise on upgrade or replacement options.
Q: Do you supply complete replacement valves as well as spare parts?
Yes. BM TECH supplies complete NBS UNIFLOW/UNICON replacement valves — both as direct replacements for end-of-life valves and as new valve supply for plant expansions and new projects. Complete replacement valves are supplied with full documentation including material certificates, pressure test records and, where applicable, oxygen service certification. Contact us with your valve specifications and we will provide availability and pricing.
Q: What is the minimum order quantity for NBS spare parts?
There is no formal minimum order quantity for NBS spare parts. We supply parts in the quantities required by the customer — from a single seal kit for an emergency repair to bulk quantities for a full plant overhaul. Pricing reflects order quantity; contact us for pricing on your specific requirement.
Q: What standards do NBS valves comply with?
NBS UNIFLOW/UNICON valves are designed and manufactured in compliance with applicable Japanese industrial standards and are supplied with documentation supporting compliance with European standards including EN ISO 5211 (actuator interface), EN 593 (butterfly valves) and PED 2014/68/EU where applicable. For marine applications, NBS valves are available with classification society approval (Lloyd’s Register, DNV GL, Bureau Veritas, ClassNK). Specific standard compliance data for your application is available from BM TECH on request.
Q: Can NBS valves be supplied with ATEX certification for use in hazardous areas?
ATEX requirements for valves in hazardous areas primarily relate to actuator and control equipment — specifically the prevention of ignition sources in potentially explosive atmospheres. NBS pneumatic actuators do not generate ignition sources in normal operation; for installations requiring ATEX-certified control equipment (solenoid valves, position indicators, positioners), BM TECH specifies ATEX-certified ancillary equipment compatible with NBS valve actuator interfaces. Contact our technical team with your hazardous area classification and we will advise on the appropriate equipment specification.
Q: What pressure testing is carried out on NBS valves before delivery?
NBS valves are pressure tested at the factory before delivery — shell test at 1.5 times the rated pressure and seat leakage test at rated pressure, in accordance with the applicable standard. Test certificates are provided with each valve. For specific applications requiring additional testing — cryogenic temperature testing, oxygen service leak testing, fire-safe testing — these can be arranged on request. Contact BM TECH to discuss specific testing requirements for your application.
Q: Do you provide material certificates for NBS valve components?
Yes. Material certificates (EN 10204 3.1 or 3.2 as required) for pressure-containing components are available for NBS valves supplied by BM TECH. Standard supply includes 3.1 material certificates. Where 3.2 certificates with third-party inspection are required — common in oil and gas and power generation applications — this is arranged at the time of order. Please specify your material certification requirements when placing your enquiry.
Q: Can NBS valves be supplied for NACE MR0175 / ISO 15156 sour service?
NBS valves in carbon steel and stainless steel configurations can be supplied with NACE MR0175 / ISO 15156 compliant material specifications — meeting the hardness and material requirements for service in hydrogen sulphide environments. NACE compliance requires specific material grades, heat treatment and hardness verification for all wetted components. Contact BM TECH with your sour service requirements and we will confirm the available NBS configurations that meet NACE MR0175 compliance.
Q: How do I request a quotation from BM TECH?
Contact BM TECH by email at biuro@bmtech.eu or by phone at +48 695 557 331. For valve supply quotations, please provide valve type, size, pressure rating, material specification, quantity and any applicable standards or certification requirements. For service quotations, please describe the installation, the scope of service required and the planned timing. We aim to provide quotations within two to three business days for standard requests.
Q: Do you work with engineering contractors and EPC companies as well as end users?
Yes. BM TECH works with engineering contractors, EPC companies, procurement companies and end users — at all stages of the project lifecycle from initial specification through procurement, installation and long-term maintenance. For EPC and contractor enquiries, we provide technical datasheets, material certificates, compliance documentation and the commercial documentation required for project procurement processes.
Q: Can you provide technical support for valve specification on new projects?
Yes — and we encourage early engagement on new projects. Valve specification decisions made at the engineering stage determine the performance, maintenance requirements and total cost of ownership of the valve population throughout the plant’s operational life. BM TECH provides technical support to engineering teams during the specification phase — reviewing process data sheets, advising on valve type and material selection, providing technical datasheets and supporting the valve specification documentation process. Early engagement avoids costly specification changes later in the project.
Q: Do you offer technical consultation without a purchase commitment?
Yes. BM TECH provides technical consultation on valve selection, sizing, material specification and maintenance planning as part of our customer engagement — we do not require a purchase commitment as a condition of providing technical advice. We believe that providing accurate, useful technical information at the specification stage is the foundation of a productive long-term customer relationship.
Q: How do I contact BM TECH for urgent service support?
For urgent service requirements — unplanned valve failures, emergency spare parts needs or urgent technical support — contact BM TECH directly by phone at +48 695 557 331. This line is monitored for urgent service calls. For non-urgent enquiries, email biuro@bmtech.eu is the preferred contact method.