产品概述
标准孔板（Orifice Plate & Flange)
孔板可直接安装于管道法兰上，因此比带环孔板更经济地测量流量，通常适用于大口径管道。在 500mm 以上的大口径管道中，沿管道圆周开设多个差压取压孔，并以环形均压管路连接，测量压力的平均值。
Daehan Instruments 的手柄式孔板与孔板法兰活接（Orifice Flange Union）配套使用。孔板外径全部经机械加工制成均匀圆盘，因此节流孔与孔板外径的同心度高。随后焊接手柄，并用专用设备研磨至规定的表面光洁度。盲板及需求量大的孔径规格的孔板常备库存，每块孔板的手柄上刻印管道尺寸、法兰等级、节流孔径、孔板材质。备有 304 及 316 不锈钢标准厚度库存，其他尺寸和材质按要求制作。
同心（Concentric）孔型的倒角是限制孔板边缘厚度的基准，按 45° 角加工。未另行指定时，以管道内径的 1/50 或节流孔径的 1/8 中较小值为基准进行倒角加工。
偏心（Eccentric）孔板是节流孔偏离中心的孔板，孔通常内切于相当于管道直径 98% 的圆，使固体或浆料得以通过。用于重化工·轻化工、钢铁、造纸、核电、石化等多个行业。
弓形（Segmental）孔板用于气体、液体流动中混有固体的场合的测量。孔的圆弧部分通常内切于管道直径 98% 的圆，弓形开口可置于管道上部或下部。用于污水处理、钢铁、化工、水处理、造纸、石化领域。
English description
Tapping of differential pressure is done by this vener contractor tap Orifice. Since Orifice plate can be installed directly to flange of pipe, flow measurement by this Orifice plate can be performed more economically than by orifice plates with rings, and it is generally suited for large diameter pipes. As for large diameter pipes of 500mm or greater, these Orifice plates are used to measure the average value of pressure by making some differential pressure tapping holes around the pipe and connecting thereto a loop form pressure equalizing pipe. DAEHAN Paddle-Type Orifice Plates are used with Orifice Flange Unions. All outer diameters of the plates are machined, providing a uniformly circular disc. This results in a high degree of concentricity of the Orifice bore and the plate outer diameter. Next, handles are carefully welded on. The plates are then sanded in special machines to a prescribed finish. Blank plates and plates with popular bore size are stocked continuously. Each plate is stamped on its handle with line size, flange rating, Orifice bore and plate material. DAEHAN maintains a stock in Type 304 and 316 Stainless Steel in standard thickness. Other size and materials are available on request. The bore and bevel is the standard of limiting the plate edge thickness. The bevel is machined on a 45 angle to the desired edge thickness. Unless otherwise specified, plates will be bevelled to 1/50 of the line I.D. or 1/8 of the Orifice bore, minimum governing.
