VISI-FLO Sight Flow Indicators Allow Positive Flow Check
VII-FLO視線流量指示器允許正流量檢查
任何流經(jīng)工藝、水、燃料、廢物或服務(wù)管線的產(chǎn)品，通常必須在管線上的特定位置進行測量。直視式流量指示器提供了一種簡單、廉價的方法，可以定性地測量流量、方向、顏色和清晰度。這不僅是一種可靠的閱讀方法，而且還允許觀看者對產(chǎn)品進行個人解讀。Any product flowing through a process, water, fuel, waste, or service line usually must be measured at certain points along the line. In-line sight flow indicators offer a simple, inexpensive means to qualitatively gage flow rate, direction, color, and clarity. Not only is this a reliable reading method, but it also allows personal interpretation by the viewer, who actually sees the product.
典型應(yīng)用是在過濾器、潤滑和冷卻管線上，以積極驗證流體流動�？梢暳髁恐甘酒饕灿糜诠收吓懦�，或作為儀表、開關(guān)、過程指示器和其他控制設(shè)備的備份。Typical applications are on filter, lubrication, and cooing lines, to positively verify fluid flow. Sight flow indicators are also used for troubleshooting, or as backups for meters, switches, process indicators, and other control devices.
為了滿足特定的需要，制定了許多不同的指標。A number of different indicators have been developed to serve specific needs.
螺旋槳指示器是顯示不透明液體的- 佳方法，因為它的能見度很高。螺旋槳也是遠距離觀察的理想選擇。但是如果流量太低，螺旋槳就不會轉(zhuǎn)動。螺旋槳指示器的另一個可能缺點，取決于流量，是它們對管路的限制。例如，2英寸。流量為100 gpm的直徑指示器將產(chǎn)生10 psi的壓降。A propeller indicator is the best way to show opaque liquids because of its high visibility. The propeller is also ideal for observation at a distance. But if flow rate is too low, the propeller will not turn. Another possible drawback to propeller indicators, depending on flow, is the restriction they add to the line. For example, a 2 in. diameter indicator with 100 gpm flow will produce a 10 psi pressure drop.
雙向擋板不僅指示流量，而且指向流向。此外，流量限制也很低。對于相同的2英寸。直徑，200 gpm流量，一個擋板指示器只造成0.7 psi的下降。A bidirectional flapper not only indicates flow, but points in the flow direction. Also, flow restriction is low. For the same 2 in. diameter, 200 gpm flow, a flapper indicator causes only a 0.7 psi drop.
如果觀察顏色和清晰度比驗證流量更重要，則使用無擋板的普通雙向可視流量指示器。這里的優(yōu)勢在于固有的簡單性。A plain bidirectional sight flow indicator without a flapper is used where observing color and clarity are more important than verifying flow. Advantage here is inherent simplicity.
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垂直線中使用滴水管。它是重力流和極低或間歇流的理想選擇。滴液管通過保持液體滴到玻璃上來確保持續(xù)可見。A drip tube is used in vertical lines. It is ideal for gravity flow and for extremely low or intermittent flow. The drip tube ensures constant visibility by keeping the fluid form dripping onto the glass.
雖然選擇- 好的指示器類型可能相當容易，但要區(qū)分流體相容性、壓力和溫度限制等因素則要復(fù)雜一些�？梢暳髁恐甘酒骺梢栽谠S多不同的車身材料中指定，以滿足流體相容性的需要。青銅是使用- 廣泛的，而且通常成本- 低。球墨鑄鐵（與青銅具有成本競爭力）、碳鋼和不銹鋼（約為青銅成本的兩倍）是其他標準車身材料。此外，還提供諸如蒙乃爾合金和哈氏合金等特殊材料。該表顯示了人體材料與普通液體的相容性。While selecting the best type of indicator may be fairly easy, sorting out factors such as fluid compatibility, pressure, and temperature limitations is a bit more involved. Sight flow indicators can be specified in a number of different body materials to suit fluid compatibility needs. Bronze is the most widely used, and is generally lowest in cost. Ductile iron (which is cost competitive with bronze), carbon steel, and stainless steel (which is about twice the cost of bronze), are other standard body materials. In addition, special materials such as Monel and Hastelloy are available. The table shows the compatibility of body materials with common fluids.
密封件的選擇也適合特定的化學應(yīng)用。丁腈橡膠、碳氟化合物、三元乙丙橡膠、氯丁橡膠和聚四氟乙烯是常用的。指示器的溫度限制取決于密封件的選擇。Seals are also chosen to suit specific chemical applications. Buna, Fluorocarbon, EPDM, Neoprene, and PTFE are commonly used. Temperature limitation for the indicators is dictated by seal choice.
因為玻璃具有優(yōu)異的耐化學性，在各種溫度和壓力下都表現(xiàn)良好，所以- 常用于觀察鏡片。指示器的- 大額定壓力（通常為400 psi）由觀察鏡選擇決定。堿石灰和硼硅酸鹽是- 常用的兩種玻璃。Because glass has excellent chemical resistance and performs well under a wide range of temperatures and pressures, it is used most often for viewing lenses. The maximum pressure rating for the indicators (generally 400 psi) is determined by viewing lens selection. Soda-lime and borosilicate are the two most common types of glass used.
模塊化裝置允許在標準主體內(nèi)安裝各種指示器，允許在不從工藝管線上拆除主體的情況下，方便檢修或更換指示器。兩側(cè)的玻璃和密封件可以從所有裝置的前部拆下，- 多2英寸。尺寸。選項還包括一系列尺寸和螺紋、法蘭、承插或?qū)付恕odular units allow the installation of various indicators within a standard body, permitting easy access for servicing or interchanging indicators without removing the body from the process line. The glass and seals from both sides can be removed from the front of all units up to 2 in. size. Options also include a range of sizes and threaded, flanged, socket, or butt-weld ends.
觀察流量指示器應(yīng)位于易于查看的位置。通常，許多行是通過一個“銀行”的指標來定向的，因此可以同時查看幾個關(guān)鍵行。對于危險品，應(yīng)在玻璃上方放置一個可選的安全防護罩，以防意外損壞。Sight flow indicators should be located where they can be easily viewed. Often, a number of lines are directed though a “bank” of indicators, so several critical lines can be viewed simultaneously. With hazardous materials, an optional safety shield should be placed above the glass to prevent accidental breakage.
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不需要對觀察流量指示器進行常規(guī)維護。但是，長期使用后，可以更換玻璃和密封件。許多指標的工作壽命為20年或20年以上，很少或根本沒有關(guān)注。Routine maintenance of sight flow indicators is not required. However, after long service the glass and seals can be replaced. Many indicators have a working life of 20 or more years with little or no attention.
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