Oil, natural gas wellhead valves of the nominal pressure level for the API2000psi, 3000psi, 5000psi, 10000psi, 15000psi, 20000psi; nominal diameter of DN46 ~ 228mm (113/16in ~ 9in); temperature rating for the K (-60 ~ 182 ), L (-42 ~ 182 ), P (-29 ~ 182 ), R (room temperature), S (-18 ~ 166 ), T (-18 ~ 182 ), U (-18 ~ 121 ), V (2 ~ 121 ); material requirements for the AA, BB, CC, DD, EE, FF, HH; material performance requirements by 36K, 45K, 60K, 75K; product technical requirements by PSL1 (Product Specification grade 1), PSL2 (product specification grade 2), PSL3 (product specification grade 3), PSL4 (product specification grade 4).

2. Oil, Gas Pipelines Valves Oil, Gas Pipelines in U.S. with the main valve API6D standard single gate or double plate, there is no diversion diversion hole or holes in the plate valve; forged or cast steel 3 style, coat type or full welded ball valve fixed ball; oil seal or pressure balanced plug valves; Swing or butterfly valve, check valve, globe; pigging valve.

The valve nominal pressure level for the CL150 (PN2.0MPa), CL300 (PN5.0MPa), CL400 (PN6.4MPa), CL600 (PN10.0MPa), CL900 (PN15.0MPa), CL1500 (PN25. 0MPa), CL2500 (PN42.0MPa); nominal diameter of DN50 ~ 1500mm (2in ~ 60in); technical requirements for fire resistance test in accordance with ISO10497; valve pressure test in accordance with ISO5208.

3. Nuclear Valves Than conventional nuclear power valves with a large thermal power station of its technical characteristics and requirements of the valve is higher. Valves generally are gate valve, globe valve, check valve, butterfly valve, safety valve, main steam isolation valves, ball valves, diaphragm valves, pressure reducing valves and control valves, etc.; the highest technical representative valve parameters are: maximum diameter DN1200mm (nuclear three butterfly), DN800mm (nuclear two of the main steam isolation valve), DN350mm (nuclear one of the main circuit gate valve); maximum pressure: about 1,500 pounds level; maximum temperature: about 350 ; medium: the cooling agent (boride water). Production of nuclear grade valves specified requirements: usually in the nuclear industry standards EJ, U.S. ASME, IEEE standards and the French island of pressurized water reactor nuclear design and construction rules for mechanical equipment, RCC-M and so on.

Nuclear power development with a specific type of valve, parameters are as follows:

no stuffing of the gate:

A hydraulic-driven gate valve. The valve piston with its own pressure to push water on or off, the valve nominal diameter: DN350, 400mm; working pressure: PN17.5MPa; working temperature: 315 .

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