Butterfly valves flow control
Butterfly valves flow control correctly specified and supplied
Butterfly valves flow control examined up close
Using butterfly valves flow control means throttling with the disc partly open, which works within limits but is not the same as using a dedicated control valve. The subject of butterfly valves flow control touches both the construction of the valve and the way the plant is operated. We approach butterfly valves flow control from the question of what the plant has to do, not from the question of what happens to be in stock. A butterfly valve is a quarter turn valve in which a circular disc rotates in the line to open or close the flow path. At larger diameters the difference in weight and price against a ball or gate valve is considerable. Metal seated executions suit temperatures, pressures and media where a liner no longer functions. We regularly see that a small change in the execution of butterfly valves flow control makes a large difference to maintenance frequency. With butterfly valves flow control it pays to include phase changes in the medium, because those sharply increase the load on the seal. A correct execution of butterfly valves flow control accounts for real operating conditions and not only for design values. An offset butterfly valve moves the axis, so the disc clears the seat immediately on opening and no rubbing wear occurs. A concentric butterfly valve has the disc axis in the centre of the bore and seals on an elastomer or PTFE liner. Anyone looking into butterfly valves flow control quickly runs into a choice that goes beyond picking a catalogue number.
Specifications and executions of butterfly valves flow control
The relationship between disc angle and flow is strongly non linear, with most of the change occurring in the middle of the travel. That principle explains why butterfly valves flow control behaves differently from a standard execution under heavier duty. For butterfly valves flow control this means that construction and operating conditions cannot be judged separately. In the nearly closed position velocity across the disc edge rises sharply, and that is where erosion begins. In a partly open position a butterfly valve can throttle, although a genuine control duty is better placed with a control valve. Quarter turn operation allows fast switching and is easy to automate with a pneumatic or electric actuator. The main strength of the butterfly valve is its compact construction, because it takes up almost no space in the direction of the pipe. For coarse throttling a butterfly valve is fine, but for a tight control loop a control valve with proper trim is the right answer. We supply butterfly valves as a loose product and as an assembled unit with actuator and accessories. Where there is doubt about the right type we prepare a comparison based on your process data. What weighs heaviest on butterfly valves flow control in practice is the combination of temperature and differential pressure, not either one alone. On butterfly valves flow control we always check the full operating envelope, including start up and shutdown.
Applications of butterfly valves flow control in industry
Butterfly valves are used for throttling in water systems, air and gas ducts and in coarse process flow adjustment. Butterfly valves appear in almost every industry, from water treatment to chemicals and from food to power generation. In hydrogen, technical gases and steam those are the executions that make the difference between working and leaking. On replacement we always check the existing installation dimensions for butterfly valves flow control, so the pipework can stay untouched. We supply butterfly valves flow control both for new build and for replacement within existing installations. The application range of butterfly valves flow control runs from simple utility duty to heavy process plant, with a corresponding difference in execution. In an existing plant butterfly valves flow control is often part of a wider question about availability and maintenance. Dutch Valve Vision focuses on the heavier segment, with metal seated and offset executions for demanding media. 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. Our market is project driven and international, and we deliver worldwide to installers, EPC contractors and end users. In plants where butterfly valves flow control is applied, the emphasis is on reliability rather than lowest purchase price. Demand for butterfly valves flow control reaches us mainly from projects where the standard range falls short.
Specifying butterfly valves flow control correctly
Standardising across several positions makes butterfly valves flow control simpler in maintenance and in spare parts management. Installation orientation and free space for the disc are points that are often overlooked in practice. Selection starts with medium and temperature, because those two immediately decide whether a soft seat is still possible. We also look at operating torque, because it rises quickly at larger sizes and higher differential pressures. Where there is doubt about butterfly valves flow control we quote two executions side by side, with the trade offs stated explicitly. Where butterfly valves flow control forms part of a safety function we record the fail position and required stroking time explicitly. The cleaning and flushing procedure counts too on butterfly valves flow control, because it can be more aggressive than the process itself. A butterfly valve stops being a simple product as soon as medium, pressure or temperature moves away from average. On standard executions the liner is the weak point, and that is exactly why metal seated designs exist. We come back with a proposal that explains why we recommend a particular execution, including the alternatives we considered. On butterfly valves flow control we check that the actuator is sized on torque at maximum differential pressure and not on an average value. On butterfly valves flow control we also state what an execution cannot do, because that prevents more problems than a list of advantages.
Ordering butterfly valves flow control from Dutch Valve Vision
Dutch Valve Vision stays available after delivery of butterfly valves flow control for technical questions and for parts. Alongside QUADAX and PRUSS we represent Pibiviesse, Schroeder, Striko, Malbranque, Daume, FluoroSeal and Guichon, so we can select the right brand for each project. On butterfly valves flow control we come back with a proposal that explains why we recommend a particular execution. We handle an enquiry for butterfly valves flow control on its technical merits rather than as a price request that only produces a number. For repeat orders of butterfly valves flow control we record the configuration, so a follow up delivery is identical to the first. 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. We keep spare parts and overhaul kits mapped per project, so that a breakdown does not start with a search from scratch. We record which execution of butterfly valves flow control was delivered, so a follow up delivery or spare part matches exactly later on. We work on butterfly valves flow control under a KIWA ISO 9001 certified quality system, which safeguards traceability. We keep the configuration data for butterfly valves flow control on file, which saves a great deal of searching if a fault occurs later. Even when the specification for butterfly valves flow control is not yet finalised, you can bring the question to us. Send us your DN, pressure class, medium and temperature at sales@dutchvalvevision.com, or call +31 (0)70-2210560 to speak to a specialist.
Frequently asked questions about butterfly valves flow control
What exactly does butterfly valves flow control mean?
A butterfly valve is a quarter turn valve in which a circular disc rotates in the line to open or close the flow path. The main strength of the butterfly valve is its compact construction, because it takes up almost no space in the direction of the pipe. In a partly open position a butterfly valve can throttle, although a genuine control duty is better placed with a control valve. A concentric butterfly valve has the disc axis in the centre of the bore and seals on an elastomer or PTFE liner. On butterfly valves flow control we prefer a well founded answer to a fast one that turns out to be wrong later. That makes butterfly valves flow control a subject where discussion up front pays for itself in operation. We find that questions about butterfly valves flow control almost always come back to the same three points: medium, temperature and required tightness. 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.
Which executions of butterfly valves flow control are available?
Metal seated executions suit temperatures, pressures and media where a liner no longer functions. Quarter turn operation allows fast switching and is easy to automate with a pneumatic or electric actuator. An offset butterfly valve moves the axis, so the disc clears the seat immediately on opening and no rubbing wear occurs. For coarse throttling a butterfly valve is fine, but for a tight control loop a control valve with proper trim is the right answer. In most projects butterfly valves flow control turns out to be less standard than it first appears. The answer to this question on butterfly valves flow control changes as soon as the medium or the temperature changes. How butterfly valves flow control behaves under varying load says more about the quality of the selection than behaviour under steady load. 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.
Which materials are used for butterfly valves flow control?
On standard executions the liner is the weak point, and that is exactly why metal seated designs exist. The relationship between disc angle and flow is strongly non linear, with most of the change occurring in the middle of the travel. We supply butterfly valves as a loose product and as an assembled unit with actuator and accessories. A butterfly valve stops being a simple product as soon as medium, pressure or temperature moves away from average. The answer on butterfly valves flow control depends strongly on operating conditions, which is why we always ask for those first. Our experience with butterfly valves flow control comes from projects in chemicals, power generation, technical gases and offshore. With butterfly valves flow control the seat is the component that determines performance, and the body is rarely the limiting factor. We work as a technical supplier rather than a catalogue reseller, which means we carry out the selection ourselves on the basis of medium, pressure, temperature and code requirements.
What should I watch technically on butterfly valves flow control?
What should I watch technically on butterfly valves flow control?
Which applications call for butterfly valves flow control?
In hydrogen, technical gases and steam those are the executions that make the difference between working and leaking. Butterfly valves appear in almost every industry, from water treatment to chemicals and from food to power generation. Dutch Valve Vision focuses on the heavier segment, with metal seated and offset executions for demanding media. Butterfly valves are used for throttling in water systems, air and gas ducts and in coarse process flow adjustment. We see this come back regularly in enquiries about butterfly valves flow control, and the answer is rarely a single sentence. On butterfly valves flow control we include start up and shutdown, because that is where the heaviest loading occurs. On project supply we record per position which execution of butterfly valves flow control was delivered, including materials and tests. 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.
What determines the price and lead time of butterfly valves flow control?
We come back with a proposal that explains why we recommend a particular execution, including the alternatives we considered. A P&ID, a datasheet or even a photograph of the existing installation often helps us faster than a long description. 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. We keep spare parts and overhaul kits mapped per project, so that a breakdown does not start with a search from scratch. For butterfly valves flow control a good specification up front is cheaper than a correction afterwards. This is one of the points on butterfly valves flow control where suppliers differ most clearly from one another. We think along on the spare parts strategy for butterfly valves flow control, so critical positions stay covered. We are based at Vlotlaan 641, 2681 TZ Monster in the Netherlands and can be reached on +31 (0)70-2210560 and at sales@dutchvalvevision.com.
What about maintenance and spare parts on butterfly valves flow control?
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. 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. 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. Our experience with butterfly valves flow control comes from projects in chemicals, power generation, technical gases and offshore. The answer to this question on butterfly valves flow control changes as soon as the medium or the temperature changes. Documentation on butterfly valves flow control has to be the kind a buyer or inspector accepts without discussion. Our customers work in chemicals, petrochemicals, pharmaceuticals, power generation, offshore and in hydrogen and ammonia projects.
How do I request a quotation for butterfly valves flow control?
Please also state the connection standard, the required leakage class and any project requirements such as NACE, PED or ATEX. For an accurate quotation we need the nominal diameter, the pressure class, the medium, the operating temperature and the required actuation. If you have an existing tag plate or serial number, send it along, because that lets us work directly from the original configuration. We come back with a proposal that explains why we recommend a particular execution, including the alternatives we considered. The answer to this question on butterfly valves flow control changes as soon as the medium or the temperature changes. If you are unsure about this on butterfly valves flow control, we are glad to put the question alongside the actual process data. For butterfly valves flow control you can come to Dutch Valve Vision for the selection, the delivery and the support afterwards. Call +31 (0)70-2210560 or send your specification to sales@dutchvalvevision.com and we will pick it up.