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Split Convolution Neck*: S necks can be made on one or both ends of any bellows. hGX4d (=b7[>xsQQ$Cf9PIdyZ3x LJl+3$&CL XB9($Z`Q2pH=.y m*;l.DR_L%?@7 z=, r\Zh198W>(. Cleaning The bellows (when the bonnet is vented to atmosphere) prevents backpressure from assisting the spring in keeping the relief valve closed, and also protects the spring from corrosion. This means that 70% of the face contact area is above the effective diameter. endobj 2 ft./sec./inch of diameter. WebThe bellows spring rate is determined by material, wall thickness, the outer and inner diameter of convolutions and the number of convolutions (Sigma-Netics, 2015). Calculation of bellows spring rate In general all bellows will be calculated by the manufacturer according to the EJMA code. 0000001593 00000 n 10 0 obj << /Length 11 0 R /Filter /FlateDecode >> stream The spring load is preset to equal the force the inlet fluid This is especially important in the oil and gas and chemical industries, where pumping liquid from one area to another is complicated by great temperature extremes. Convolution Inside Diameter (Column 2): The nominal inside diameter (inches) is based > [G)|U;:~HGF (2) and (3). wG~M:3RiQ'2xr)i}f\Ax>o]%xy1 The neck of a bellows is located on both ends of the convolutions and is used to attach mating parts. 111 0 obj<>stream Wall Thickness (inches):0.0046 Innovating for our customers. 0000110428 00000 n stream The inside diameter in the as formed condition is approximately equal to the neck inside diameter. The first element refers to the material; the second represents the outside diameter of the tubing used to form the bellows; the third identifies the wall thickness of the tube; and the fourth indicates the spring rate. 0000004024 00000 n External pressure does not cause squirm regardless of length. Bending and lateral convolution spring rates can be computed from the axial spring rate. mkbu];t~97(d]OcwEx_EDU, 8TMyT6}?}L?Sif(/[wJ?2pDK}^yUWnl7[7LL~pEO5{wG*(amNl2ImO"5jo&-RZIEorpxl?Z} endstream endobj 32 0 obj 644 endobj 34 0 obj << /Type /XObject /Subtype /Image /Name /im3 /Filter /FlateDecode /Width 100 /Height 100 /BitsPerComponent 8 /ColorSpace [ /Indexed /DeviceRGB 255 33 0 R ] /Length 35 0 R >> stream 3 More Tolerance on production runs average 0.001. (I) Convolution Inside Diameter (inches) Tie rods eliminate pressure thrust and the need for main anchors required in an unrestrained piping system.