Valves for Piping Industry
Valves are mechanical devices specifically designed to direct, start, stop, mix or regulate the flow, pressure, or temperature of a process fluid. Valves may be designed to handle either liquid or gas applications. Metals-Piping supply industrial valves which are manufactured from various materials including cast iron, cast steel, forged steel, alloy steel, stainless steel, duplex stainless steel, nickel alloy, copper alloy, titanium, zirconium and other special alloys. By nature of their design, function, and application, valves come in a wide variety of styles, sizes, pressure ratings, etc.
The Classification of Valves
Valves can be classified into 3 categories according to its function: on-off valves, non-return valves, and throttling valves. On-off valves are used to handle the function of starting or stopping the process flow of the medium; non-return valves are designed to allow the the fluid to flow only in desired direction or prevent back flow within the valve passage. Throttling valves are used to regulate the flow temperature, or pressure of the service. Valves can be used for general services under low/moderate temperature & pressure as well as non corrosive conditions, special services under specific design parameters or service conditions, and severe services in which conditions such as high temperature, high pressure, severe corrosion, rapid pressure drop, explosion, or flashing may exist. Valves can also be classified according to its mechanical motion into linear valves or rotary valves.
Basic Specification of Valves
- Types: ball valve, gate valve, check valve, butterfly valve, globe valve, plug valve, control valve, plunger valve, diaphragm valve, safety valve, pressure relieving valve, steam trap, regulation valve, needle valve, vacuum valve.
- Port Size: full port(FB), reduced port(RB).
- Operation: handwheel operated, lever operated, worm gear operated, electric actuator, pneumatic actuator, hydraulic actuator.
- Seating: soft seated or metal seated.
- Connection: butt welding(BW), flanged(RTJ, RF, FF), scoket weld(SW), threaded.
- Pressure Ratings: Class 150 ~ Class 2500; PN 6 ~ PN 400; Size: 1/2″ ~ 48″.
Design, Manufacture & Test Standards for Valves
- Gate Valves: API 602, API 606, BS 5352, JPI-7S-36, API 6D, API 597, API 600, ISO 10434, API 603, BS 1414, MSS SP 42, JIS B 2073, JIS B 2083, JPI-7S-46, ASME B16.34, MSS SP 81, BS 5157, API 6A; ISO 5996, ISO 7259, API 595, MSS Sp 70, BS 5150, BS 5151, JIS B 2031, JIS B 2062, JPI-7S-37, JIS B 2043, JIS B 2044, JIS B 2052, API 604, BS 5163; MSS SP 80, BS 1952, BS 5154, JIS B 2011, JIS B 2013, JIS B 2023, JIS B 2028; DIN 3352, DIN 3202, EN 558, GOST 5762, GOST 3706.
- Globe Valves: JPI-7S-46, JIS B 2071, JIS B 2072, JIS B 2081, JIS B 2082, BS 5352, JPI-7S-36, ASME B16.34, BS 1873, MSS SP 42, BS 5160; MSS SP 85, JIS B 2041, JIS B 2042, JIS B 2051; DIN 3356, DIN 3202, API 6D, MSS SP 80, BS 5154, JIS B 2011, JIS B 2021, JIS B 2026, JIS B 2027, JIS B 2022, ASME B16.15.
- Check Valves: JIS B 2074, JIS B 2084, JIS B 2071, ASME B16.34, MSS SP 42, API 6D, ISO 14313, API 594, BS 1868, BS 5352, BS 5160, BS 1873, JPI-7S-36, MSS SP 71, BS 5153, JIS B 2045, BS 5152, JIS B 2053, MSS Sp 80, BS 5154, JIS B 2024, JIS B 2025.
- Ball Valves: ISO 7121, MSS SP 72, API 6D, ISO 14313, JPI-7S-48, BS 5351, BS 5159, ASME B16.34, API 608.
- Plug Valves: BS 5158, MSS Sp 78, API 593, JIS B 2191, JIS B 2192, DIN 7113, DIN 7116, ASME B16.34, BS 5158, API 599, API 593, BS 5353, BS 1570, API 6D, ISO 14313.
- Butterfly Valves: API 609, BS 5155, BS 3952, MSS SP 67, MSS SP 68, JIS B 2032, JIS B 2024.
- Test & Inspection: API 598, ASME B16.34, ISO 5208, MSS SP 61, EN 10266.1, NF M87-401, API 6D, API 6A, API 600, JIS B 2003, GOST 356-80, BS 6364, ISO 10497, API 607.