Standard_Parts_Catalogue

Page 1548 | 3.5 Controlling, Venting, Sealing of Liquids and Gases GN 743.7 GN 743.8 Oil Sight Glasses up to 100 °C up to 180 °C with Conical Thread, Brass 1 d 1 2 d 2 3 Type How to order (100 °C) 1 2 3 GN743.7-24-R1-A 1 d 1 2 d 2 3 Type How to order (180 °C) 1 2 3 GN743.8-18-¾NPT-B 3 Type A With reflector B Without reflector • EPDM seals On request Information The conical thread (EN 10226) of the oil sight glasses GN 743.7 / GN 743.8 makes a metallic seal possible. When tightening the conical external thread R it blocks itself with the appropriate cylindrical internal thread Rp. With the datum plane a the R-external thread has the same thread diame- ter as the Rp-internal thread, so that it can be screwed in by hand. The strong tightening by means of a tool increases the length of engagement and seals the screw connection. Additionally a sealant (hemp or teflon band) is usually used. The R-thread is „roughened“, so that the sealant does not shift when screwing in. Oil sight glasses GN 743.7 / GN 743.8 can also be used on pressurised tanks. Tests regarding maximum pressure are available. see also... • More Information of these Oil Sight Glasses under GN 743.2 / GN 743.3 → Page 1545 • Body Brass CuZn40Pb2 • Reflector Technopolymer (Polysulfon) • GN 743.7 - - Temperature resistant up to 100 °C - - Sight glass float glass - - O-ring, rubber NBR (Perbunan ® ) • GN 743.8 - - Temperature resistant up to 180 °C - - Sight glass security glass (ESG) - - O-ring, rubber FPM (Viton ® ) Identification by not black finish of the seal • Elastomer Characteristics → Page 2158 • Plastic Characteristics → Page 2158 • RoHS Specification 1 2 d 1 d 2 External thread conical a Datum plane d 3 at a d 4 Internal thread e l 1 l 2 l 3 Usable thread length p Thread pitch s cylindrical conical 11 R 3 ⁄ 8  6,4 16,7 Rp 3 ⁄ 8 - 22   13 6 10,1 1,34 19   11 3 ⁄ 8 NPT     6,1 17,1 - 3 ⁄ 8 NPT   22   15 6 - 1,41 19,1 14 R 1 ⁄ 2  8,2 21   Rp 1 ⁄ 2 - 27,5 17 7 13,2 1,81 24   14 1 ⁄ 2 NPT     8,1 21,2 - 1 ⁄ 2 NPT   27,5 16 7 - 1,81 23,8 18 R 3 ⁄ 4  9,5 26,4 Rp 3 ⁄ 4 - 31   18 8 14,5 1,81 27   18 3 ⁄ 4 NPT     8,6 26,6 - 3 ⁄ 4 NPT   33   18 8 - 1,81 28,6 24 R 1     10,4 33,2 Rp 1     - 40,5 21 9 16,8 2,30 36   24 1 NPT     10,2 33,7 - 1 NPT    41,5 22 8 - 2,21 34,9 32 R 1 1 ⁄ 4 12,7 42   Rp 1 1 ⁄ 4 - 53   24 9 19,1 2,30 46   32 1 1 ⁄ 4 NPT 10,7 42,2 - 1 1 ⁄ 4 NPT 51,5 23 9 - 2,21 44,5