Solenoid valve reliability in lower energy operations

If ตัววัดแรงดันน้ำ doesn’t function, your course of doesn’t run, and that’s cash down the drain. Or worse, a spurious trip shuts the process down. Or worst of all, a valve malfunction results in a dangerous failure. Solenoid valves in oil and gas purposes management the actuators that move large process valves, including in emergency shutdown (ESD) techniques. The solenoid must exhaust air to enable the ESD valve to return to fail-safe mode whenever sensors detect a dangerous course of scenario. These valves must be quick-acting, sturdy and, above all, reliable to stop downtime and the associated losses that happen when a process isn’t operating.
And that is even more important for oil and fuel operations where there could be limited power out there, similar to distant wellheads or satellite offshore platforms. Here, solenoids face a double reliability problem. First, a failure to function correctly can not solely cause expensive downtime, but a maintenance call to a distant location additionally takes longer and costs greater than an area restore. Second, to minimize back the demand for energy, many valve manufacturers resort to compromises that actually scale back reliability. This is unhealthy enough for process valves, however for emergency shutoff valves and other security instrumented techniques (SIS), it is unacceptable.
Poppet valves are typically better suited than spool valves for remote areas as a outcome of they’re much less advanced. For low-power applications, look for a solenoid valve with an FFR of 10 and a design that isolates the media from the coil. (Courtesy of Norgren Inc.)
Choosing a reliable low-power solenoid
Many elements can hinder the reliability and performance of a solenoid valve. Friction, media flow, sticking of the spool, magnetic forces, remanence of electrical current and material characteristics are all forces solenoid valve producers have to beat to construct probably the most dependable valve.
High spring force is essential to offsetting these forces and the friction they cause. However, in low-power applications, most producers should compromise spring drive to allow the valve to shift with minimal power. The discount in spring force results in a force-to-friction ratio (FFR) as little as 6, though the commonly accepted security degree is an FFR of 10.
Several components of valve design play into the amount of friction generated. Optimizing each of these allows a valve to have greater spring drive while still maintaining a high FFR.
For instance, the valve operates by electromagnetism — a current stimulates the valve to open, permitting the media to circulate to the actuator and move the process valve. This media may be air, but it might even be natural gas, instrument gas or even liquid. This is particularly true in distant operations that must use whatever media is available. This means there is a trade-off between magnetism and corrosion. Valves by which the media is obtainable in contact with the coil have to be made of anticorrosive materials, which have poor magnetic properties. A valve design that isolates the media from the coil — a dry armature — allows the use of highly magnetized material. As a result, there is not any residual magnetism after the coil is de-energized, which in turn allows faster response times. This design also protects reliability by preventing contaminants in the media from reaching the inside workings of the valve.
Another issue is the valve housing design. Usually a heavy (high-force) spring requires a high-power coil to beat the spring strength. Integrating the valve and coil into a single housing improves effectivity by preventing vitality loss, allowing for using a low-power coil, resulting in less power consumption without diminishing FFR. This integrated coil and housing design additionally reduces warmth, stopping spurious journeys or coil burnouts. A dense, thermally efficient (low-heat generating) coil in a housing that acts as a warmth sink, designed with no air gap to trap heat across the coil, virtually eliminates coil burnout concerns and protects course of availability and security.
Poppet valves are usually better suited than spool valves for distant operations. The reduced complexity of poppet valves increases reliability by lowering sticking or friction factors, and decreases the number of parts that can fail. Spool valves often have giant dynamic seals and lots of require lubricating grease. Over time, especially if the valves usually are not cycled, the seals stick and the grease hardens, leading to larger friction that must be overcome. There have been reports of valve failure because of moisture within the instrument media, which thickens the grease.
A direct-acting valve is the best choice wherever attainable in low-power environments. Not only is the design much less complicated than an indirect-acting piloted valve, but in addition pilot mechanisms usually have vent ports that may admit moisture and contamination, leading to corrosion and permitting the valve to stay within the open place even when de-energized. Also, direct-acting solenoids are particularly designed to shift the valves with zero minimum strain necessities.
Note that some bigger actuators require excessive circulate charges and so a pilot operation is necessary. In this case, you will need to confirm that every one elements are rated to the same reliability rating because the solenoid.
Finally, since most distant locations are by definition harsh environments, a solenoid put in there will have to have sturdy development and be in a position to face up to and function at extreme temperatures whereas nonetheless sustaining the identical reliability and security capabilities required in less harsh environments.
When deciding on a solenoid management valve for a distant operation, it is attainable to find a valve that doesn’t compromise efficiency and reliability to reduce power demands. Look for a high FFR, simple dry armature design, nice magnetic and warmth conductivity properties and sturdy building.
Andrew Barko is the sales engineer for the Energy Sector of IMI Precision Engineering, makers of IMI Norgren, IMI Maxseal and IMI Herion brand parts for energy operations. He provides cross-functional experience in software engineering and enterprise growth to the oil, gasoline, petrochemical and power industries and is certified as a pneumatic Specialist by the International Fluid Power Society (IFPS).
เกจวัดแรงดันลมขนาดเล็ก is the key account manager for the Energy Sector for IMI Precision Engineering. He presents experience in new business growth and buyer relationship management to the oil, gasoline, petrochemical and power industries and is certified as a pneumatic specialist by the International Fluid Power Society (IFPS).
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