Nuclear power valve
Nuclear power valves have higher technical characteristics and requirements than conventional large-scale thermal power station valves. Valves generally have gate valves, globe valves, check valves, butterfly valves, safety valves, main steam isolation valves, ball valves, diaphragm valves, pressure reducing valves and control valves; the highest technical parameters of representative valves are: maximum diameter DN1200mm ( Nuclear grade 3 butterfly valve), DN800mm (core 2 primary steam isolation valve), DN350mm (core 1 primary circuit gate valve); maximum pressure: about 1500 pounds; maximum temperature: about 350 ° C; medium: coolant ( Borated water) and the like. Production of nuclear grade valve product requirements: usually according to the nuclear industry standard EJ, the United States ASME, IEEE standards and French pressurized water reactor nuclear island machinery and equipment "target = _blank> mechanical equipment design and construction rules RCC-M.
2. Valves for oil and gas wellhead devices
The valves for oil and gas wellheads are mainly single or double gates conforming to the US API6A standard, forged steel parallel gate valves with diversion holes or non-drainage holes, mud valves, angle throttle valves, and oilfield-specific parallel Regulating valve, oilfield-specific straight-through check valve, water injection, polymer-specific parallel gate valve, clamp-type parallel gate valve, pilot-operated safety valve and check valve.
The nominal pressure levels of valves for oil and gas wellheads are API2000psi, 3000psi, 5000psi, 10000psi, 15000psi, 20,000psi; nominal diameters are DN46~228mm (113/16in~9in); temperature grade is K(-60~182°C) , L (-42 ~ 182 ° C), P (-29 ~ 182 ° C), R (room temperature), S (-18 ~ 166 ° C), T (-18 ~ 182 ° C), U (-18 ~ 121 ° C) , V (2 ~ 121 ° C); material requirements are AA, BB, CC, DD, EE, FF, HH; material performance requirements are 36K, 45K, 60K, 75K; product technical requirements according to PSL1 (product specification level 1), PSL2 (Product Specification Level 2), PSL3 (Product Specification Level 3), PSL4 (Product Specification Level 4).
3. Valves for oil and gas long-distance pipelines
The valves for oil and natural gas long-distance pipelines are mainly single or double gates complying with the US API6D standard, slab gate valves with diversion holes or non-drainage holes; forged steel or cast steel three-body, top-mounted or all-welded Fixed ball valve; oil seal or pressure balanced plug valve; swing or butterfly check valve, ball check valve; pig valve.
The nominal pressure levels of these valves are CL150 (PN2.0MPa), CL300 (PN5.0MPa), CL400 (PN6.4MPa), CL600 (PN10.0MPa), CL900 (PN15.0MPa), CL1500 (PN25.0MPa), CL2500. (PN42.0MPa); nominal diameter is DN50~1500mm (2in~60in); fire test technical requirements are according to ISO10497; pressure test of valve is ISO5208.
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