Spandex, Lycra or elastane is a synthetic fiber known for its exceptional elasticity. It is a polyether-polyurea copolymer that was invented in 1958 by chemist Joseph Shivers at DuPont's Benger Laboratory in Waynesboro, Virginia. Spandex Spinneret,Spandex Spinnerets For Spinning Machinery,Stainless Steel Spandex Spinneret,High Precision Spandex Spinneret Changzhou Jier Precision Machinery Manufacturing Co., Ltd. , https://www.jier-spinneret.com
The name "spandex" is an anagram of the word "expands".[6] It is the preferred name in North America; in continental Europe it is referred to by variants of "elastane", i.e. élasthanne (France), Elastan (Germany, Sweden), elastano (Spain), elastam (Italy) and elastaan (Netherlands), and is known in the UK, Ireland, Portugal, Spain, Brazil, Argentina, Australia, New Zealand and Israel primarily as Lycra. Brand names for spandex include Lycra (made by Koch subsidiary Invista, previously part of DuPont), Elaspan (also Invista), Acepora (Taekwang), Creora (Hyosung), INVIYA (Indorama Corporation), ROICA and Dorlastan (Asahi Kasei), Linel (Fillattice), and ESPA (Toyobo).
Medium pressure steam system valve selection
Diameter DN65 or less Pipeline Control Valves Ball Valves: These valves are rated for a safe working pressure of 150 psi and non-impact cold water working pressure of 600 psi. Two-piece molded bronze body with Teflon valve seat, standard runner, Style packing nut with adjustable stem packing, blow-out stainless steel stem and stainless steel ball. Where pressure drop is a concern, valves that do not reduce the diameter of full-flow ball valves or similar structures are required. The valve connection port should have an ANSI thread of sufficient depth, or have a longer weld port, and be manufactured in accordance with the American Society of Valve and Fitting Manufacturers Standards Association MSS-SP110. The standard flow channel valve can be used: the United States NIBCO T-580-70-66 ball valve (thread) can be used without reducing the diameter of the entire flow valve: the United States Nibo Ke T-585-70-66 (thread) gate valve: The valve should be threaded, working at 125 lb. open rod, union bonnet, solid wedge, and manufactured in accordance with MSS-SP 80, American Society of Valve and Fitting Manufacturers Standards. Body, bonnet, and wedge materials comply with ASTM B 62 bronze. Stem material is silicon bronze or B 99 low zinc alloy, asbestos-free filler, malleable or ductile cast iron handwheel in accordance with ASTM B 371 standard. If working pressure is high, close to 100 psi, a 150-pound union bonnet or similar valve should be used. Valves Available: 125 lb. NIBCO T-124 Gate Valve 150 lb. NIBCO T-134 Gate Valve Globe Valves / Angle Valves: This valve operates at 125 lb. pressure and is manufactured in accordance with US Valves and Fittings Standardization Institute MSS-SP 80 standard; body and bonnet material is in line with the American Society for Testing and Materials ASTM B 62 standard bronze. Stem material meets the American Society for Testing and Materials ASTM B371 anti-loss phenomenon of silicon bronze or B 99 standard low-zinc alloy, non-asbestos filler, PTFE valve seat flap, wrought or ductile iron hand wheel. If working pressure is high, close to 100 psi, a 150-pound union bonnet or similar valve should be used. If used to shut off throttling or boiler drainage, the valve should be fully plug stainless steel seat / flap. Available valves: 125 lb. US NIBCO T-211-Y globe valve / T-311-Y angle valve 150 lb. US NIBCO T-235-Y globe valve / T-335-Y angle valve 200 300 pounds of US NIBCO T-376-AP globe valve (all plug stainless steel seat / valve) diameter DN65 Line Valves Gate Valves, Shut-Off Valves, and Angle Valves: These valves operate at a 125-pound operating pressure and are operated in accordance with the American Society for Valve and Fitting Manufacturers Standards MSS-SP70 (Gate Valve) or MSS-SP85 Standard made, flanged, bolted bonnet, OS & Y, cast iron body, bronze trim, body and bonnet in accordance with ASTM A 126, Class B cast iron, filler and lining are free of asbestos. For steam operating pressures in excess of 100 psi, valves rated 250 pounds or similar are required. Valves can be used: the United States Nibco 125-pound F-617-O gate valve the United States Nibco 125-pound F-718-B globe valve the United States Nibco 125-pound F-818-B angle valve the United States NIBCO 250-pound F-667-O gate valve Nepalese United States 250-pound F-768-B globe valve Check valve: Check valve diameter DN65 should be used Y-shaped spin-on structure, and in accordance with the United States valves and fittings Manufacturers Standardization Association MSS-SP80 standard, working pressure 125 pounds, in line with ASTM B 62 standard bronze body, the configuration PTFE valve seat valve disc. For steam operating pressures in excess of 100 psi, valves rated 250 pounds or similar are required. Available valves: 125 lb. US NIBCO T-413-Y Check Valve 150 lb. US NIBCO T-433-Y Check Valve Check valve with a DN 65 and larger should be a swing- Manufactured to 125 lb. Flanged, cast iron body and bronze trim in accordance with ASTM A 126 Class B, asbestos-free liner, manufactured in accordance with the American Association of Valve and Fitting Manufacturer Standards MSS-SP71 pad. For steam operating pressures in excess of 100 psi, valves rated 250 pounds or similar are required. Valves can be used: the United States Nibco 125-pound F-918-B Check Valve Nepalese United States 250 pounds F-968-B Check Valve Cut-off Check Valve: Diameter over DN65 250 pound-angle cut-off Valve-type cut-off check valves can be used in boilers instead of globe valves, angle valve type control valves and swing check valves. Flange body and bonnet are made of cast iron in accordance with ASTM A 126 Class B and are available with bronze trim and graphite-free liners. Check the diameter of the check valve, please refer to the manufacturer's recommendation. The valve can be used: the United States NIBCO F-869-B deadline check valve