740 ASHCROFT | Alldatasheet
Document overview
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Technical content
FEATURES
Lar ge diaphragm provides ample displacement for inches of water ranges Ideal for high static, low dif ferential pressure
applications
Oil and Gas Refineries Chemical and Petr ochemical W ater and Wastewater NACE compliant Processes (Sour Gas Separation) Biogas and Biodiesel 740-41 High Displacement Threaded Seal SPECIFICATIONS Connection Style: 740: threaded 741: threaded with flushing port Process Connection Size: ¼, ½, ¾ or 1 NPT Female Instrument Connection Size: or ½ NPT Pressure Rating (MAWP): up to 750 psi Added Tolerance: ±0.5% typical WETTED COMPONENTS Diaphragm Bottom Housing Gasket
316 SS, Tantalum,
Titanium, Hastelloy® B, Hastelloy® C 276, K-Monel® 316SS, Tantalum, Titanium, Hastelloy® B, Hastelloy® C 276, Monel®, Carpenter® 20 PTFE (rated for -150ºF to 500ºF) NON-WETTED COMPONENTS Top Housing Bolts Nuts 316L SS, Monel®, titanium Carbon Steel, 316SS (optional) Stainless steel KEY BENEFITS
- Diaphragm welded to top housing eliminates the risk of fill fluid loss
- Large displacement drives low pressure instrumentation
- Optimal for high-pressure, low-differential pressure applications All specifications are subject to change without notice. All sales subject to standard terms and conditions. ©2021 Ashcroft Inc. 740-741_seal_ds_RevB_01-21-21 ashcroft.com info@ashcroft.com 1.800.328.8258 1 of 4 740/741 High Displacement Threaded Diaphragm Seal Data Sheet
Fill Fluid Temperature Viscosity (cSt at 70ºF (21ºC)) Variation Code Notes Glycerin (food grade) 0°F to 400°F (-18°C to 204°C) 1,300 CG Direct-mounting only. Not for use with vacuum service 50 cSt Silicone -40°F to 500°F (-40°C to 260°C) 50 CK 10 cSt Silicone -40°F to 500°F (-40°C to 260°C) 10 DJ Halocarbon® 4.2 -70°F to 300°F (-57°C to 199°C) 4.2 CF For use with oxygen/ oxidizing process media Slytherm® 800 -40°F to 750°F (-40°C to 400°C) 10 HA High temperature applications Syltherm® XLT -150°F to 500°F (-100°C to 260°C) 1.4 CC Low temperature applications Calflo® AF -20°F to 600°F (-29°C to 316°C) 60 KF High temperature, silicone-free Mineral Oil 10°F to 400°F (-12°C to 204°C) 75 MY Neobee® M-20 (food grade) 5°F to 400°F (-15°C to 204°C) 9.5 NM Silicone (food grade) -40°F to 500°F (-40°C to 260°C) 350 CZ Distilled Water 40°F to 185°F (4°C to 85°C) 0.9 FJ 50/50 Glycerin/Water 15°F to 200°F (-9°C to 93°C) 30 GH Propylene Glycol -50°F to 325°F (-46°C to 163°C) 54 CV Ethylene Glycol 20°F to 325°F (-7°C to 163°C) 14 FK 50/50 Ethylene Glycol/Water -25°F to 190°F (-32°C to 88°C) 2.9 CT 80/20 Glycerin/Water 15°F to 225°F (-9°C to 107°C) 270 GR 95/5 Water/Propylene Glycol 40°F to 185°F (4°C to 85°C) 1.0 PY All specifications are subject to change without notice. All sales subject to standard terms and conditions. ©2021 Ashcroft Inc. 740-741_seal_ds_RevB_01-21-21 ashcroft.com info@ashcroft.com 1.800.328.8258 2 of 4 740/741 High Displacement Threaded Diaphragm Seal Data Sheet
ORDERING CODE Example: 10 740 S S 02T XCK NH Process Connection Size 25 - ¼ NPT Female 50 - ½ NPT Female 75 - ¾ NPT Female 10 - 1 NPT Female 10 Diaphragm Type 740 - 740 High displacement seal, threaded process connection 740 741 - 741 High displacement seal, threaded process connection with flush port Diaphragm Materials S - 316L Stainless steel S P - Monel ® 400 U - Tantalum G - Hastelloy ® B H - Hastelloy ® C-276 TI - Titanium Bottom Housing Materials S - 316L Stainless steel S M - Monel ® 400 D - Carpenter 20 ® G - Hastelloy ® B H - Hastelloy ® C-276 J - Hastelloy ® C-22 TI - Titanium B - Steel Instrument Connection Size 02T - 1⁄4 NPT Female 02T 04T - 1⁄2 NPT Female Options (if choosing option(s) must include an “X”) X__ Fill Fluid (See Table 1 on page 2 for more available fill fluids) CK - 50 cSt Silicone CK CF - Halocarbon Optional Features AW - Single 1⁄2 NPT flushing connection (741 only) DB - Dual 1⁄2 NPT flushing connections (741 only) DK - Dual 1⁄4 NPT flushing connections (741 only) MQ - Positive material indentification DU - Instrument welded to seal, instrument must be like-material to top housing PU - Pipe plug for flushing connection. Plug will match bottom housing material. Seals with flushing connections only NH - Stainless steel tag wired to product NH HY - Hydrostatic testing 6B - Cleaned for oxygen service When selecting an instrument, refer to the Min/Max Guide for compatibility with this diaphragm seal or scan the QR code to the right. All specifications are subject to change without notice. All sales subject to standard terms and conditions. ©2021 Ashcroft Inc. 740-741_seal_ds_RevB_01-21-21 ashcroft.com info@ashcroft.com 1.800.328.8258 3 of 4 740/741 High Displacement Threaded Diaphragm Seal Data Sheet
DIMENSIONS in [ ] are millimeters Model A B C D C A B (Type 741 Only) Bottom of Housing to CL of 1/4 NPT Flushing Port D For reference only, consult Ashcroft for specific dimensional drawings All specifications are subject to change without notice. All sales subject to standard terms and conditions. ©2021 Ashcroft Inc. 740-741_seal_ds_RevB_01-21-21 ashcroft.com info@ashcroft.com 1.800.328.8258 4 of 4 740/741 High Displacement Threaded Diaphragm Seal Data Sheet