Piece Ball Valve Classification And Industry Application

Piece Ball Valve Classification

1. Valves for Oil and Gas Wellhead Equipment

Valves for oil and gas wellhead equipment primarily include single-disc or double-disc forged steel parallel gate valves with or without diversion holes that comply with US API 6A specifications, mud valves, angle throttle valves, parallel regulating valves for oilfields, straight-through check valves for oilfields, parallel gate valves for water injection and polymer applications, clamp-type parallel gate valves, pilot-operated safety valves, and check valves.

The nominal pressure level of Piece Ball Valve for oil and gas wellhead equipment is API2000psi, 3000psi, 5000psi, 10000psi, 15000psi, 20000psi; the nominal diameter is DN46~228mm (113/16in~9in); the temperature level is K (-60~182℃), L (-42~182℃), P (-29~182℃), R (room temperature), S (-18~166°C), T (-18~182°C), U (-18~121°C), V (2~121°C); material requirements include AA, BB, CC, DD, EE, FF, and HH; material performance requirements include 36K, 45K, 60K, and 75K; product technical requirements include PSL1 (Product Specification Level 1), PSL2 (Product Specification Level 2), PSL3 (Product Specification Level 3), and PSL4 (Product Specification Level 4).

2. Valves for Long-Distance Oil and Natural Gas Pipelines

Valves for long-distance oil and natural gas pipelines primarily include single-disc or double-disc slab gate valves with or without orifices that meet the US API 6D standard; forged steel or cast steel three-piece, top-entry, or fully welded trunnion-mounted ball valves; oil-sealed or pressure-balanced plug valves; swing or butterfly check valves, ball check valves; piggable valves, etc.

These Piece Ball Valve have nominal pressure ratings of CL150 (PN 2.0 MPa), CL300 (PN 5.0 MPa), CL400 (PN 6.4 MPa), CL600 (PN 10.0 MPa), CL900 (PN 15.0 MPa), CL1500 (PN 25.0 MPa), and CL2500 (PN 42.0 MPa); nominal diameters range from DN50 to 1500 mm (2 in to 60 in). Fire resistance testing requirements comply with ISO 10497; pressure testing for Piece Ball Valve complies with ISO 5208.

3. Nuclear Power Valves

The Piece Ball Valve used in nuclear power plants have higher technical characteristics and requirements than the Piece Ball Valve used in conventional large thermal power plants. Valves typically include gate valves, globe valves, check valves, butterfly valves, safety valves, main steam isolation valves, ball valves, diaphragm valves, pressure reducing valves, and control valves. Typical specifications for Piece Ball Valve include: maximum diameters of DN1200mm (butterfly valves for nuclear power level 3), DN800mm (main steam isolation valves for nuclear power level 2), and DN350mm (main circuit gate valves for nuclear power level 1); maximum pressures of approximately 1500 psi; maximum temperatures of approximately 350°C; and media of operation including coolant (borated water). Nuclear-grade Piece Ball Valve are generally manufactured in accordance with the EJ nuclear industry standard, the American Standards for Enterprises in the U.S. (ASME), the IEEE standard, and the French standard for the design and construction of pressurized water reactor nuclear island machinery (RCC-M).

The specific types and parameters of valves used in nuclear power plants are as follows:

(1) Gate valves without stuffing box:

a) Hydraulically actuated gate valves. This valve uses its own water pressure to propel a piston to open or close. Its nominal diameters are DN350 and 400mm; its operating pressure is PN17.5MPa; and its operating temperature is 315°C. b. Fully enclosed electric gate valve. This valve uses a specially designed screen-type motor, with the gate disc opening and closing motion driven by a submerged internal planetary reduction mechanism. Its nominal diameters range from DN100 to 800mm; its operating pressures are PN2.5 to 45.0MPa; and its operating temperature is 200°C to 500°C.

Note: The advantages of the two types of packingless gate valves mentioned above are: the lack of a packing seal eliminates external leakage points and reduces energy consumption. Disadvantages: their complex design and high cost.

⑵ Nuclear power plant globe valves:

This valve is used as a globe valve in auxiliary pipelines. These valves generally come in three configurations: packed globe valves, bellows globe valves, and metal diaphragm globe valves. This valve is designed for medium-pressure (medium temperature, medium pressure) water and steam; nominal diameter: DN10-150mm.

⑶ Nuclear Power Butterfly Valves:

This butterfly valve is used in cooling systems and systems transporting air within containment vessels. This valve generally comes in three configurations: coaxial, inline rubber-lined butterfly valves, eccentric metal-sealed butterfly valves, and double-acting metal-sealed butterfly valves (where the disc first disengages the sealing surface before reversing). This valve has a nominal diameter of DN ≤ 2500mm; operating pressure: PN < 4.0 MPa; and operating temperature: 100-150°C. Rapid-closing butterfly valves for air duct systems, with nominal diameters of DN400-1200mm, are also listed as development areas.

⑷ Nuclear Power Pilot-Operated Safety Valve with Detector:

This pilot-operated safety valve is used in nuclear island systems. This pilot-operated safety valve with a detector uses a sensitive relationship between pressure and spring force to adjust the position of two contacts for controlling release and filling, thus preventing sticking. This valve utilizes a positive-acting disc design with spring preload and bellows seal, ensuring a secure seal. The valve has a nominal diameter of DN600mm and an operating pressure of PN1.265MPa.

⑸ Nuclear Power Check Valve:

This check valve, used in steam systems, has a similar design to a lift check valve. The valve has a nominal diameter of DN64-800mm (2.5-30in); an operating pressure of PN1.0-42.0MPa (Class 600-2500); and an operating temperature of -29°C to 1050°C.

(6) Nuclear Power Main Steam Isolation Valves

Main steam isolation valves for the nuclear island and conventional island, as well as main feedwater valves, have a nominal diameter of DN800mm, a nominal pressure of 40.0 MPa, and a temperature of 700°C.

In addition, safety valves that meet earthquake requirements are also urgently needed for nuclear power.