In the 1930s, the United States invented the butterfly valve, which was introduced to Japan in the 1950s and was not commonly used in Japan until the 1960s. However, promotion in our country was after the 1970s. At present, butterfly valves of DN300 mm or above have gradually replaced gate valves in the world. Compared with the gate valve butterfly valve has a short opening and closing time for the moment of small, small installation space and light weight. Take DN1000 as an example, the butterfly valve is about 2T, while the gate valve is about 3.5T, and the butterfly valve is easy to combine with various driving devices, and has good durability and reliability. ? The disadvantage of rubber seal butterfly valve is used for throttling, due to improper use will produce cavitation, rubber peel, damage and so on. To this end, the international development of metal seal butterfly valve, cavitation area decreases in recent years, China has also developed a metal seal butterfly valve in Japan in recent years also developed cavitation-resistant, low vibration, low noise comb-shaped butterfly valve. General seal seat life under normal circumstances, rubber 15 years - 20 years, metal 80 years - 90 years. But how to choose correctly according to working conditions. Butterfly valve opening and the relationship between flow, basically a linear change in proportion. If it is used to control the flow, its flow characteristics are closely related to the flow resistance of the pipe. For example, the diameters and forms of the valves installed in the two pipes are all the same, while the pipe loss coefficient is different, and the flow difference of the valve will also be very large. ? If the valve is in a state of large throttling, the back of the valve plate is prone to cavitation, the possibility of damage to the valve, are generally used outside the 15 °. When the butterfly valve is at the opening, the shape of the opening formed by the valve body and the front end of the butterfly plate is centered on the valve shaft, and the two sides form a different state. The front end of the butterfly plate on one side moves in the direction of flowing water while the direction of the counter flow Therefore, one side of the valve body and the valve plate is formed like a nozzle-shaped opening, the other side is similar to the orifice-shaped opening, the nozzle side is faster than the throttling side of the flow rate, and the throttling side valve generates a negative pressure below, Rubber seals tend to come off. Butterfly valve operating torque, due to the opening and the valve opening and closing direction of different values, horizontal butterfly valve, especially large-diameter valve, due to the depth of the valve shaft, the difference between the head and the resulting torque can not be ignored. In addition, the valve inlet side of the device elbow, the formation of bias current, the torque will increase. Valve in the middle of the opening, due to the role of water flow torque, the operating mechanism needs self-locking.
CAP Type welded/seamless
Standard: ASME/ANSI B16.9 ANSI/ASME B16.11 ANSI/ASME B16.28
BSEN10253-2 BS EN10253-4
Size:1/2''~42''(Seamless); 48''~80''(Welded)
Wall thickness: Sch5~Sch160\XXS
Manufacturing process: PRESSED etc.
Material:
Carbon steel:
FSGP PG370W PT370
.ASTM / ASME A234: WPB - WPC - WP1WP11 - WP12 - WP5 - WP22 - - WP91
ASTM / ASME A/SA 420: WPL6 - WPL3EN 10216-2: P195GH - P235GH - P265GH-P355Nh
20MnNb6 - 16Mo3 - 8MoB5-4 - 14MoV6310CrMo5-5 - 13CrMo4-5 - 10CrMo9-10-15NiCuMoNb5-6-4 - X11CrMo5X11CrMo9-1 - X10CrMoVNb9-1X10CrWMoVNb9-2 - X20CrMoV11-1former BS-DIN-AFNOR equivalent grades)
HIGH YIELD STEEL FOR PIPELINE AND OFFSHORE FITTINGS
ASTM A860 / MSS-SP75: WPHY 42WPHY 46 - WPHY 52 - WPHY 60-WPHY 65 - WPHY 70 grades
WPHY 80 only as per MSS-SP75 EN 10208-2: L245NB - L290NBL360NB - L415NB - L360QBL415QB - L450QB - L485QB - L555Q
Stainless steel:
304/SUS304/UNS S30400/1.4301
304L/UNS S30403/1.4306;
304H/UNS S30409/1.4948;
309S/UNS S30908/1.4833
309H/UNS S30909;
310S/UNS S31008/1.4845;
310H/UNS S31009;
316/UNS S31600/1.4401;
316Ti/UNS S31635/1.4571;
316H/UNS S31609/1.4436;
316L/UNS S31603/1.4404;
316LN/UNS S31653;
317/UNS S31700;
317L/UNS S31703/1.4438;
321/UNS S32100/1.4541;
321H/UNS S32109;
347/UNS S34700/1.4550;
347H/UNS S34709/1.4912;
348/UNS S34800;
Alloy steel:
ASTM A234 WP5/WP9/WP11/WP12/WP22/WP91;
ASTM A860 WPHY42/WPHY52/WPHY60/WPHY65;
ASTM A420 WPL3/WPL6/WPL9;
Duplex steel
ASTM A182 F51/S31803/1.4462;
ASTM A182 F53/S2507/S32750/1.4401;
ASTM A182 F55/S32760/1.4501/Zeron 100;
2205/F60/S32205;
ASTM A182 F44/S31254/254SMO/1.4547;
17-4PH/S17400/1.4542/SUS630/AISI630;
F904L/NO8904/1.4539;
725LN/310MoLN/S31050/1.4466
253MA/S30815/1.4835;
Nickel alloy steel:
Alloy 200/Nickel 200/NO2200/2.4066/ASTM B366 WPN;
Alloy 201/Nickel 201/NO2201/2.4068/ASTM B366 WPNL;
Alloy 400/Monel 400/NO4400/NS111/2.4360/ASTM B366 WPNC;
Alloy K-500/Monel K-500/NO5500/2.475;
Alloy 600/Inconel 600/NO6600/NS333/2.4816;
Alloy 601/Inconel 601/NO6001/2.4851;
Alloy 625/Inconel 625/NO6625/NS336/2.4856;
Alloy 718/Inconel 718/NO7718/GH169/GH4169/2.4668;
Alloy 800/Incoloy 800/NO8800/1.4876;
Alloy 800H/Incoloy 800H/NO8810/1.4958;
Alloy 800HT/Incoloy 800HT/NO8811/1.4959;
Alloy 825/Incoloy 825/NO8825/2.4858/NS142;
Alloy 925/Incoloy 925/NO9925;
Hastelloy C/Alloy C/NO6003/2.4869/NS333;
Alloy C-276/Hastelloy C-276/N10276/2.4819;
Alloy C-4/Hastelloy C-4/NO6455/NS335/2.4610;
Alloy C-22/Hastelloy C-22/NO6022/2.4602;
Alloy C-2000/Hastelloy C-2000/NO6200/2.4675;
Alloy B/Hastelloy B/NS321/N10001;
Alloy B-2/Hastelloy B-2/N10665/NS322/2.4617;
Alloy B-3/Hastelloy B-3/N10675/2.4600;
Alloy X/Hastelloy X/NO6002/2.4665;
Alloy G-30/Hastelloy G-30/NO6030/2.4603;
Alloy X-750/Inconel X-750/NO7750/GH145/2.4669;
Alloy 20/Carpenter 20Cb3/NO8020/NS312/2.4660;
Alloy 31/NO8031/1.4562;
Alloy 901/NO9901/1.4898;
Incoloy 25-6Mo/NO8926/1.4529/Incoloy 926/Alloy 926;
Inconel 783/UNS R30783;
NAS 254NM/NO8367;
Monel 30C
Nimonic 80A/Nickel Alloy 80a/UNS N07080/NA20/2.4631/2.4952
Nimonic 263/NO7263
Nimonic 90/UNS NO7090;
Incoloy 907/GH907;
Nitronic 60/Alloy 218/UNS S21800
The function of a cap is to block off the end of a line.
The cap is placed over the open end and welded around the join
Buttweld Pipe Cap
Pipe Cap,Alloy Steel Cap,Pipe Fitting,Socket Cap
He Bei GuangHao Pipe Fittings Co .,LTD (Cangzhou Sailing Steel Pipe Co., Ltd) , https://www.guanghaofitting.com