Flow metering valves
Flow metering valves: what matters in practice
The technology behind flow metering valves
Flow metering valves combine flow adjustment with measurement, so that a branch can be set and verified rather than only opened and closed. We find that questions about flow metering valves almost always come back to the same three points: medium, temperature and required tightness. Once flow metering valves is correctly specified it disappears from the fault list, and that is exactly the intention. A gate valve closes with a plate moving across the flow, giving an almost unrestricted bore but requiring a long stroke and considerable height. Directional valves are not about shutting off but about routing flow to one of several outlets. A balancing valve makes it possible to limit and measure flow in a branch, so that a system can be brought into balance. Operating conditions govern the service life of flow metering valves far more strongly than the nominal figures on a datasheet. How flow metering valves behaves under varying load says more about the quality of the selection than behaviour under steady load. We regularly see that a small change in the execution of flow metering valves makes a large difference to maintenance frequency. A ball valve closes with a bored ball turning through a quarter turn, which allows fast switching with a full bore. Every valve type has its own working principle, and that principle determines where the type is strong and where it falls short. The term flow metering valves is used broadly in the market, which is why it helps to define precisely what it means in your case.
What to watch technically on flow metering valves
The measuring function is usually based on a pressure difference across a defined restriction inside the valve. The balance between required tightness and available operating force is a recurring tension on flow metering valves. With flow metering valves it pays to include phase changes in the medium, because those sharply increase the load on the seal. Reproducibility of the setting matters, because a valve that drifts makes the whole balancing exercise pointless. A butterfly valve closes with a rotating disc in the line, giving the most compact and lightest solution at larger diameters. A throttling or control valve is intended to vary flow area rather than to shut off completely, and that difference drives the trim construction. A check valve allows flow in one direction only and works without actuation, purely on the basis of the flow itself. A lockable setting prevents the position from being changed unintentionally after commissioning. When standardising across a plant we advise deliberately limiting the number of different types. Dutch Valve Vision deliberately does not supply every type, but focuses on the specials where the standard market drops out. With flow metering valves the seat is the component that determines performance, and the body is rarely the limiting factor. What weighs heaviest on flow metering valves in practice is the combination of temperature and differential pressure, not either one alone.
Sectors and applications for flow metering valves
They are used in balancing hydraulic systems, distribution networks, cooling circuits and heating installations. In utilities and water treatment butterfly and gate valves dominate through their price at large diameters. In chemicals the choice is driven mainly by medium compatibility and by the required tightness. Demand for flow metering valves reaches us mainly from projects where the standard range falls short. On replacement we always check the existing installation dimensions for flow metering valves, so the pipework can stay untouched. Our customers use flow metering valves in positions where a failure has immediate consequences for production. In plants where flow metering valves is applied, the emphasis is on reliability rather than lowest purchase price. In process industry all types sit alongside each other in the same plant, each where that type is strongest. 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. Alongside QUADAX and PRUSS we represent Pibiviesse, Schroeder, Striko, Malbranque, Daume, FluoroSeal and Guichon, so we can select the right brand for each project. The application range of flow metering valves runs from simple utility duty to heavy process plant, with a corresponding difference in execution. During turnarounds flow metering valves is regularly on the critical path, and then predictability matters more than the lowest price.
Selection criteria for flow metering valves
On flow metering valves we check that the actuator is sized on torque at maximum differential pressure and not on an average value. The required leakage class drives the choice between a soft and a metal seat more strongly than price does. Where there is doubt we quote two types side by side, with advantages and disadvantages stated explicitly. Face to face length and weight weigh heavily at larger diameters, and there a butterfly valve often beats a gate or ball valve. Standardising across several positions makes flow metering valves simpler in maintenance and in spare parts management. For flow metering valves total cost of ownership weighs more than purchase price, certainly when replacement has to happen during a shutdown. Where there is doubt about flow metering valves we quote two executions side by side, with the trade offs stated explicitly. For flow metering valves we ask as standard for DN, pressure class, medium, temperature and required actuation. In our advice we also state what a type cannot do, because that prevents more problems than a list of advantages. We regularly replace gate valves with metal seated butterfly valves, gaining on weight, space and operating torque. For an accurate quotation we need the nominal diameter, the pressure class, the medium, the operating temperature and the required actuation. The cleaning and flushing procedure counts too on flow metering valves, because it can be more aggressive than the process itself. On flow metering valves we also state what an execution cannot do, because that prevents more problems than a list of advantages.
Dutch Valve Vision as your supplier of flow metering valves
For flow metering valves you can come to Dutch Valve Vision for the selection, the delivery and the support afterwards. Our customers work in chemicals, petrochemicals, pharmaceuticals, power generation, offshore and in hydrogen and ammonia projects. On flow metering valves we come back with a proposal that explains why we recommend a particular execution. We supply flow metering valves as a loose product or as a fully assembled unit with actuator and accessories. Our specialists are happy to discuss flow metering valves on the basis of your P&ID, your datasheet or simply a photograph of the situation. Documentation such as material certificates, test reports and declarations is supplied as standard, matched to what the project requires. 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. Material certificates and test reports are supplied with flow metering valves, matched to what the project requires. We keep the configuration data for flow metering valves on file, which saves a great deal of searching if a fault occurs later. We work on flow metering valves under a KIWA ISO 9001 certified quality system, which safeguards traceability. For repeat orders of flow metering valves we record the configuration, so a follow up delivery is identical to the first. Bring us your question at sales@dutchvalvevision.com or +31 (0)70-2210560, even when the specification is not finalised yet.
Frequently asked questions about flow metering valves
What exactly does flow metering valves mean?
A butterfly valve closes with a rotating disc in the line, giving the most compact and lightest solution at larger diameters. Directional valves are not about shutting off but about routing flow to one of several outlets. A ball valve closes with a bored ball turning through a quarter turn, which allows fast switching with a full bore. A gate valve closes with a plate moving across the flow, giving an almost unrestricted bore but requiring a long stroke and considerable height. On flow metering valves we include start up and shutdown, because that is where the heaviest loading occurs. Our experience with flow metering valves comes from projects in chemicals, power generation, technical gases and offshore. With flow metering valves the difference between a good and a mediocre solution often sits in details that do not show on a drawing. Our customers work in chemicals, petrochemicals, pharmaceuticals, power generation, offshore and in hydrogen and ammonia projects.
Which executions of flow metering valves are available?
A balancing valve makes it possible to limit and measure flow in a branch, so that a system can be brought into balance. We regularly replace gate valves with metal seated butterfly valves, gaining on weight, space and operating torque. The measuring function is usually based on a pressure difference across a defined restriction inside the valve. Reproducibility of the setting matters, because a valve that drifts makes the whole balancing exercise pointless. The answer to this question on flow metering valves changes as soon as the medium or the temperature changes. We always explain why we arrive at a particular recommendation on flow metering valves, so you can follow the reasoning yourself. On flow metering valves we always check the full operating envelope, including start up and shutdown. We think along from the basic specification through to the tag plate, and supply documentation that a buyer or inspector accepts without discussion.
Which materials are used for flow metering valves?
Dutch Valve Vision deliberately does not supply every type, but focuses on the specials where the standard market drops out. When standardising across a plant we advise deliberately limiting the number of different types. Every valve type has its own working principle, and that principle determines where the type is strong and where it falls short. A check valve allows flow in one direction only and works without actuation, purely on the basis of the flow itself. That makes flow metering valves a subject where discussion up front pays for itself in operation. In most projects flow metering valves turns out to be less standard than it first appears. That principle explains why flow metering valves behaves differently from a standard execution under heavier duty. 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.
What should I watch technically on flow metering valves?
What should I watch technically on flow metering valves?
Which applications call for flow metering valves?
In utilities and water treatment butterfly and gate valves dominate through their price at large diameters. In process industry all types sit alongside each other in the same plant, each where that type is strongest. In chemicals the choice is driven mainly by medium compatibility and by the required tightness. They are used in balancing hydraulic systems, distribution networks, cooling circuits and heating installations. For flow metering valves a good specification up front is cheaper than a correction afterwards. We see this come back regularly in enquiries about flow metering valves, and the answer is rarely a single sentence. We see demand for flow metering valves rising in hydrogen and ammonia projects, where tightness requirements are high. 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 determines the price and lead time of flow metering valves?
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. We come back with a proposal that explains why we recommend a particular execution, including the alternatives we considered. On repeat orders we record the configuration, so a follow up delivery is identical to the first and installation holds no surprises. This is one of the points on flow metering valves where suppliers differ most clearly from one another. If you are unsure about this on flow metering valves, we are glad to put the question alongside the actual process data. Dutch Valve Vision stays available after delivery of flow metering valves for technical questions and for parts. Call +31 (0)70-2210560 or send your specification to sales@dutchvalvevision.com and we will pick it up.
What about maintenance and spare parts on flow metering valves?
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. 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. Documentation such as material certificates, test reports and declarations is supplied as standard, matched to what the project requires. In most projects flow metering valves turns out to be less standard than it first appears. That makes flow metering valves a subject where discussion up front pays for itself in operation. A tag plate with project data belongs with flow metering valves as standard where the project requires it. 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.
How do I request a quotation for flow metering valves?
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. A P&ID, a datasheet or even a photograph of the existing installation often helps us faster than a long description. If you have an existing tag plate or serial number, send it along, because that lets us work directly from the original configuration. On flow metering valves we include start up and shutdown, because that is where the heaviest loading occurs. If you are unsure about this on flow metering valves, we are glad to put the question alongside the actual process data. We think along on the spare parts strategy for flow metering valves, so critical positions stay covered. 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.