Pneumatic And Hydraulic Equipment Page 34

SERIES D DUAL FERRULE INSTRUMENT TUBE FITTINGS Pressure Ratings The BI-Lok Dual Series D Ferrule Tube Fitting consists of four elements - nut, front ferrule, back ferrule and fitting body. However, the actual sealing function is accomplished with the addition of a fifth element, the tubing itself. Therefore, the pressure rating of the fitting assembly is a direct function of the tubing selected. Proper tube selection is critical and the ultimate responsibility of the system designer/user. This table will provide the allowable pressure ratings of a variety of commonly used tube sizes and materials. NPT 316 Stainless and Carbon Steel Brass Pipe Size Male Female Male Female 1/8" 10000 6500 5000 3200 1/4" 8000 6600 4000 3300 3/8" 7800 5300 3900 2600 1/2" 7700 4900 3800 2400 3/4" 7300 4600 3600 2300 1" 5300 4400 2600 2200 Pipe End Pressure Ratings Fittings with both Tube and NPT threaded pipe end connections have different pressure ratings. When specifying these type fittings, please refer to this chart for maximum allowable pressure ratings. A thread sealant is recommended when using NPT connections. Assembly Instructions The following procedures refer to the proper assembly of the BI-Lok Series D Dual Ferrule Tube Fittings. 1. BI-Lok Tube Fittings are supplied fully assembled and individually bagged, allowing for clean efficient make-up. Should component assembly be required, please note that the order of assembly is the front ferrule into the cone of fitting body, back ferrule and fitting nut as noted in Fig. 1. 2. Insert the tubing into the fitting body until it bottoms out against the tube stop shoulder of the fitting. Please note that tubing should be cut squarely and free of burrs. 3. Hand tighten the nut as much as possible, bringing the fitting to what is called the "finger tight" position. 4. Secure the fitting body with a wrench and tighten the nut with another wrench an additional 3/4 of a turn for tube sizes 1/16" thru 3/16" or for sizes 1/4" and above 1-1/4 turns. (refer to Fig. 2a, 2b, and 2c). Reassembly Instructions To reassemble a BI-Lok Series D Dual Ferrule Tube Fitting, simply insert the tube assembly (nut, front and back ferrule preswaged on the tube) into the fitting body and hand tighten the nut. Next, using a wrench, rotate the nut approximately 1/4 of a turn (back to the original make-up position) and then tighten the nut slightly. Tube Measuring and Fitting When measuring and bending tubing it is important to be aware of two critical measurements. The first being the tube insertion depth (reference dimension G) into the fitting assembly which must be considered in the determining the over all length of tube required. The other being the minimum length of straight tubing required for a proper tube bend (reference dimension H). Both measurements are dependent on tube OD; please use Fig. 3 for reference purposes. Fig. 1 Fig. 2a Fig. 2b Fig. 3 Fig. 2c Sizes 1/16" to 3/16" Sizes 1/4" to 1" 3/4 turn 1-1/4 turn Tube A Straight Hex Size Tube OD Thread Tube Nut C G H I 1 1/16" 10-32 5/16" 0.27 0.34 1/2" 0.19 2 1/8" 5/16"-20 7/16" 0.34 0.50 23/32" 0.25 3 3/16" 3/8"-20 1/2" 0.37 0.54 3/4" 0.28 4 1/4" 7/16"-20 9/16" 0.40 0.60 13/16" 0.31 5 5/16" 1/2"-20 5/8" 0.44 0.64 7/8" 0.34 6 3/8" 9/16"-20 11/16" 0.47 0.66 15/16" 0.37 8 1/2" 3/4"-20 7/8" 0.47 0.90 1-3/16" 0.50 10 5/8" 7/8"-20 1" 0.47 0.96 1-1/4" 0.56 12 3/4" 1"-20 1-1/8" 0.47 0.96 1-1/4" 0.56 14 7/8" 1-1/8"-20 1-1/4" 0.47 1.02 1-5/16" 0.63 16 1" 1-5/16"-20 1-1/2" 0.56 1.23 1-1/2" 0.75 BI-Lok (314) 427-0600 800-444-0522 (FAX) 314-427-3502 www. j hf.com JHF Catalog [ Volume 7 ] 34 Prices Subject to Change Without Notice John Henry Foster pneumatic and hydraulic equipment

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