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发布日期:2021年12月06日

SHINESTAR STEEL GROUP CO., LTD

盛仕达钢铁股份有限公司
Ball Valve

Short Description:


  • Keywords: Check Valves, Ball Valves, Butterfly Valves, Gate Valves, Safety Valves
  • Size: OD:NPS from 1/2'' to 48'', DN from 15 to 1200,WT: 2-80mm, SCH 40/80/XXS
  • Standard & Grade: Carbon Steel --- ASTM A234, ASTM A105/A106/A53/A283-D,API5L GR.B /A671-CC-70 /A515-50 /A135-A /A179-C;Stainless Steel --- ASTM 403 304/304L, 316/316L,316Ti,321,317L,310S; Alloy Steel --- ASTM A234 WP 1/5/9/11/12/22/91
  • ends: Plain End/Bevelled End, Burr Removed
  • Delivery: Within 30 days and Depends on your order quantity
  • Payment: TT, LC , OA , D/P
  • Packing: Packed in Wood Cabins/Wood Tray
  • Application: Oil, Gas, Water
  • Product Detail

    Specification

    Standard

    Painting & Coating

    Packing & Loading

    A ball valve is a form of quarter-turn valve which uses a hollow, perforated and pivoting ball to control flow through it. It is open when the ball’s hole is in line with the flow and closed when it is pivoted 90-degrees by the valve handle.The handle lies flat in alignment with the flow when open, and is perpendicular to it when closed, making for easy visual confirmation of the valve’s status.

    Ball valves are durable, performing well after many cycles, and reliable, closing securely even after long periods of disuse. These qualities make them an excellent choice for shutoff and control applications, where they are often preferred to gates and globe valves, but they lack their fine control in throttling applications.

    The ball valve’s ease of operation, repair, and versatility lend it to extensive industrial use, supporting pressures up to 1,000 bar (100 MPa; 15,000 psi) and temperatures up to 752 °F (400 °C), depending on design and materials used. Sizes typically range from 0.2 to 48 inches (5.1 to 1,219.2 mm). Valve bodies are made of metal, plastic, or metal with a ceramic; floating balls are often chrome plated for durability. One disadvantage of a ball valve is that they trap water in the center cavity while in the closed position. In the event of a freeze, the sides can crack due to expansion of ice forming. Some means of insulation or heat tape in this situation will usually prevent damage. Another option for cold climates is the “freeze tolerant ball valve”. This style of ball valve incorporates a freeze plug in the side so in the event of a freeze up, the freeze plug ruptures (acts as a sacrificial disk), thus making for an easy repair. Now instead of replacing the whole valve, just screw in a new freeze plug.

    FUNCTIONS FROM VALVES ARE:

    Stopping and starting flow

    Reduce or increase a flow

    Controlling the direction of flow

    Regulating a flow or process pressure

    Relieve a pipe system of a certain pressure

    Classification of Valves

    The following are some of the commonly used valve classifications, based on mechanical motion:

    Linear Motion Valves. The valves in which the closure member, as in gate, globe, diaphragm, pinch, and lift Check Valves, moves in a straight line to allow, stop, or throttle the flow.

    Rotary Motion Valves. When the valve-closure member travels along an angular or circular path, as in butterfly, ball, plug, eccentric- and Swing Check Valves, the valves are called rotary motion valves.

    Quarter Turn Valves. Some rotary motion valves require approximately a quarter turn, 0 through 90°, motion of the stem to go to fully open from a fully closed position or vice versa.

    CLASSIFICATION OF VALVES BASED ON MOTION

    Valve Types Linear Motion Rotary Motion Quarter Turn
    Gate YES NO NO
    Globe YES NO NO
    Plug NO YES YES
    Ball NO YES YES
    Butterfly NO YES YES
    Swing Check NO YES NO
    Diaphragm YES NO NO
    Pinch YES NO NO
    Safety YES NO NO
    Relief YES NO NO
    Valve Types Linear Motion Rotary Motion Quarter Turn

    Class Ratings

    Pressure-temperature ratings of valves are designated by class numbers. ASME B16.34, Valves-Flange, Threaded, and Welding End is one of the most widely used valve standards. It defines three types of classes: standard, special, and limited. ASME B16.34 covers Class 150, 300, 400, 600, 900, 1500, 2500, and 4500 valves.


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