High performance butterfly valve
Everything about high performance butterfly valve for industry
The technology behind high performance butterfly valve
A high performance butterfly valve is built to API 609 category B, which means an offset disc, a reinforced shaft and a seat that handles pressure and temperature well beyond a standard concentric valve. It pays to understand the working principle behind high performance butterfly valve first, because the limits follow from that principle. The subject of high performance butterfly valve touches both the construction of the valve and the way the plant is operated. A quadruple offset construction adds a fourth offset, which distributes the load far more evenly around the full circumference of the seat. The result of that fourth offset is that sealing performs equally well in both flow directions, which is not a given with triple offset valves. Because sealing is achieved by torque rather than by deformation of an elastomer, tightness is maintained over thousands of cycles. What weighs heaviest on high performance butterfly valve in practice is the combination of temperature and differential pressure, not either one alone. We regularly see that a small change in the execution of high performance butterfly valve makes a large difference to maintenance frequency. How high performance butterfly valve behaves under varying load says more about the quality of the selection than behaviour under steady load. That offset removes the rubbing movement across the seat, which is the main cause of wear in concentric butterfly valves. Since a controlled contact face is formed in the closed position, no run in period is required and the valve performs to specification from the first stroke. We find that questions about high performance butterfly valve almost always come back to the same three points: medium, temperature and required tightness.
Material, seat and construction on high performance butterfly valve
The term high performance separates this class from the rubber lined concentric valves used in water and HVAC service. Operating conditions govern the service life of high performance butterfly valve far more strongly than the nominal figures on a datasheet. The balance between required tightness and available operating force is a recurring tension on high performance butterfly valve. The double, triple and quadruple offset designs all fall within this category, with rising performance and rising price. In an offset butterfly valve the centre of the disc does not sit in the centre of the flow, so the disc lifts away from the seat immediately on opening. A triple offset design combines two geometric offsets with an inclined cone axis, so contact between disc and seat only occurs in the last few degrees of travel. Both the seat and the sealing edge are metal, so temperature, steam, vapour and aggressive media cause no degradation of the seal. The main gain is that the valve can be used as a real isolation device rather than only as a throttling element. The disc can be reworked when worn, so the service life of the body is often many times that of the sealing components. Maintenance is limited to packing and bearings, and because the seat is metal there is no liner to replace. A correct execution of high performance butterfly valve accounts for real operating conditions and not only for design values. In practice we find that most failures around high performance butterfly valve come not from the material but from a wrong assumption during selection.
Applications of high performance butterfly valve in industry
They are used in chemical, petrochemical and power plant lines where a concentric valve would fail on temperature or differential pressure. In chemical and petrochemical plants these valves are used where both tightness and emission requirements carry serious weight. In power generation they sit in steam, condensate and flue gas lines where temperature is far beyond the range of soft seats. On project supply we record per position which execution of high performance butterfly valve was delivered, including materials and tests. In plants where high performance butterfly valve is applied, the emphasis is on reliability rather than lowest purchase price. Our customers use high performance butterfly valve in positions where a failure has immediate consequences for production. During turnarounds high performance butterfly valve is regularly on the critical path, and then predictability matters more than the lowest price. In technical gases and hydrogen applications the metal seal is decisive, because small molecule size and emission limits reinforce each other. What defines us is that we would rather spend an extra half hour on the specification than ship the wrong valve that comes back two months later. We think along from the basic specification through to the tag plate, and supply documentation that a buyer or inspector accepts without discussion. We supply high performance butterfly valve both for new build and for replacement within existing installations. Demand for high performance butterfly valve reaches us mainly from projects where the standard range falls short.
Selection criteria for high performance butterfly valve
The right choice around high performance butterfly valve starts with a full set of process data rather than with a request for a price. Where a ball valve or gate valve becomes a problem through mass and face to face length, an offset butterfly valve often delivers the same tightness at a fraction of the weight. The choice between triple and quadruple offset depends on whether the valve has to seal in two directions and how high the differential pressure runs. In selection we look first at medium and temperature, then at differential pressure, and only after that at body style and actuation. On high performance butterfly valve we also state what an execution cannot do, because that prevents more problems than a list of advantages. If a simpler type will do the job, we say so on high performance butterfly valve, even when that means a smaller order. We never recommend a heavier execution of high performance butterfly valve than needed, because over specification only raises price and lead time. For high performance butterfly valve total cost of ownership weighs more than purchase price, certainly when replacement has to happen during a shutdown. Installation orientation is less critical on bidirectional designs, which prevents mistakes during field assembly. In vacuum service a metal seated offset valve outperforms an elastomer seat, because there is no liner that can be drawn inwards. A P&ID, a datasheet or even a photograph of the existing installation often helps us faster than a long description. Standardising across several positions makes high performance butterfly valve simpler in maintenance and in spare parts management. On high performance butterfly valve we check that the actuator is sized on torque at maximum differential pressure and not on an average value.
High performance butterfly valve supplied with technical advice
For high performance butterfly valve you can come to Dutch Valve Vision for the selection, the delivery and the support afterwards. We think along from the basic specification through to the tag plate, and supply documentation that a buyer or inspector accepts without discussion. We think along on the spare parts strategy for high performance butterfly valve, so critical positions stay covered. We supply high performance butterfly valve as a loose product or as a fully assembled unit with actuator and accessories. On high performance butterfly valve we come back with a proposal that explains why we recommend a particular execution. For shutdowns and turnarounds we look at accelerated routes, and in those cases we are honest up front about what is and is not achievable. Documentation such as material certificates, test reports and declarations is supplied as standard, matched to what the project requires. Tests around high performance butterfly valve are carried out by us or on our instruction according to the requirements in the specification. A tag plate with project data belongs with high performance butterfly valve as standard where the project requires it. We record which execution of high performance butterfly valve was delivered, so a follow up delivery or spare part matches exactly later on. Even when the specification for high performance butterfly valve is not yet finalised, you can bring the question to us. For repeat orders of high performance butterfly valve we record the configuration, so a follow up delivery is identical to the first. You can reach us on +31 (0)70-2210560 and at sales@dutchvalvevision.com, and our office hours are Monday to Friday from 09:00 to 17:00.
Frequently asked questions about high performance butterfly valve
What exactly does high performance butterfly valve mean?
The result of that fourth offset is that sealing performs equally well in both flow directions, which is not a given with triple offset valves. Since a controlled contact face is formed in the closed position, no run in period is required and the valve performs to specification from the first stroke. A quadruple offset construction adds a fourth offset, which distributes the load far more evenly around the full circumference of the seat. A triple offset design combines two geometric offsets with an inclined cone axis, so contact between disc and seat only occurs in the last few degrees of travel. We see this come back regularly in enquiries about high performance butterfly valve, and the answer is rarely a single sentence. That makes high performance butterfly valve a subject where discussion up front pays for itself in operation. The term high performance butterfly valve is used broadly in the market, which is why it helps to define precisely what it means in your case. Our market is project driven and international, and we deliver worldwide to installers, EPC contractors and end users.
Which executions of high performance butterfly valve are available?
Because sealing is achieved by torque rather than by deformation of an elastomer, tightness is maintained over thousands of cycles. The term high performance separates this class from the rubber lined concentric valves used in water and HVAC service. Installation orientation is less critical on bidirectional designs, which prevents mistakes during field assembly. In an offset butterfly valve the centre of the disc does not sit in the centre of the flow, so the disc lifts away from the seat immediately on opening. We always explain why we arrive at a particular recommendation on high performance butterfly valve, so you can follow the reasoning yourself. The answer to this question on high performance butterfly valve changes as soon as the medium or the temperature changes. That principle explains why high performance butterfly valve behaves differently from a standard execution under heavier duty. Dutch Valve Vision operates under a KIWA ISO 9001 certified quality system, which in the RFQ stage of chemical and offshore projects is usually a hard requirement.
Which materials are used for high performance butterfly valve?
The main gain is that the valve can be used as a real isolation device rather than only as a throttling element. Both the seat and the sealing edge are metal, so temperature, steam, vapour and aggressive media cause no degradation of the seal. In vacuum service a metal seated offset valve outperforms an elastomer seat, because there is no liner that can be drawn inwards. That offset removes the rubbing movement across the seat, which is the main cause of wear in concentric butterfly valves. If you are unsure about this on high performance butterfly valve, we are glad to put the question alongside the actual process data. This is one of the points on high performance butterfly valve where suppliers differ most clearly from one another. On high performance butterfly valve we always check the full operating envelope, including start up and shutdown. Alongside QUADAX and PRUSS we represent Pibiviesse, Schroeder, Striko, Malbranque, Daume, FluoroSeal and Guichon, so we can select the right brand for each project.
What should I watch technically on high performance butterfly valve?
What should I watch technically on high performance butterfly valve?
Which applications call for high performance butterfly valve?
They are used in chemical, petrochemical and power plant lines where a concentric valve would fail on temperature or differential pressure. Offshore, weight saving counts, and at larger diameters a butterfly valve saves considerably compared with a ball valve. In chemical and petrochemical plants these valves are used where both tightness and emission requirements carry serious weight. In technical gases and hydrogen applications the metal seal is decisive, because small molecule size and emission limits reinforce each other. In most projects high performance butterfly valve turns out to be less standard than it first appears. On high performance butterfly valve we include start up and shutdown, because that is where the heaviest loading occurs. On replacement we always check the existing installation dimensions for high performance butterfly valve, so the pipework can stay untouched. We think along from the basic specification through to the tag plate, and supply documentation that a buyer or inspector accepts without discussion.
What determines the price and lead time of high performance butterfly valve?
We quote a realistic lead time rather than an optimistic one, because a missed delivery date costs more than an extra week in the planning. Lead times depend on the execution, because a standard size from a running series behaves very differently from a valve in an exotic alloy with NACE certification. For an accurate quotation we need the nominal diameter, the pressure class, the medium, the operating temperature and the required actuation. Please also state the connection standard, the required leakage class and any project requirements such as NACE, PED or ATEX. Our experience with high performance butterfly valve comes from projects in chemicals, power generation, technical gases and offshore. For high performance butterfly valve a good specification up front is cheaper than a correction afterwards. We handle an enquiry for high performance butterfly valve on its technical merits rather than as a price request that only produces a number. Send us your DN, pressure class, medium and temperature at sales@dutchvalvevision.com, or call +31 (0)70-2210560 to speak to a specialist.
What about maintenance and spare parts on high performance butterfly valve?
Maintenance is limited to packing and bearings, and because the seat is metal there is no liner to replace. We keep spare parts and overhaul kits mapped per project, so that a breakdown does not start with a search from scratch. On repeat orders we record the configuration, so a follow up delivery is identical to the first and installation holds no surprises. Documentation such as material certificates, test reports and declarations is supplied as standard, matched to what the project requires. The answer to this question on high performance butterfly valve changes as soon as the medium or the temperature changes. The answer on high performance butterfly valve depends strongly on operating conditions, which is why we always ask for those first. We keep the configuration data for high performance butterfly valve on file, which saves a great deal of searching if a fault occurs later. Dutch Valve Vision supplies special valves for special applications from its base in Monster, the Netherlands, with QUADAX and PRUSS as the core brands in the programme.
How do I request a quotation for high performance butterfly valve?
If you have an existing tag plate or serial number, send it along, because that lets us work directly from the original configuration. For shutdowns and turnarounds we look at accelerated routes, and in those cases we are honest up front about what is and is not achievable. A P&ID, a datasheet or even a photograph of the existing installation often helps us faster than a long description. We come back with a proposal that explains why we recommend a particular execution, including the alternatives we considered. This is one of the points on high performance butterfly valve where suppliers differ most clearly from one another. We see this come back regularly in enquiries about high performance butterfly valve, and the answer is rarely a single sentence. For high performance butterfly valve you can come to Dutch Valve Vision for the selection, the delivery and the support afterwards. Requests can be submitted by phone on +31 (0)70-2210560, by e-mail at sales@dutchvalvevision.com or through the contact form on our website.