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DIN BS EN ANSI JIS KS GOST PN16 PN10 Q41F-16P Ball Valve Factory

DIN BS EN ANSI JIS KS GOST PN16 PN10 Q41F-16P Ball Valve Factory

Country/Region china
Company hjfitting limited
Categories Globe Valve
Update 2017-08-01 10:25:47
ICP License Issued by the Chinese Ministry
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DIN BS EN ANSI JIS KS GOST PN16 PN10 Q41F-16P Ball Valve Factory

DIN Ball Valve 1.Technical Specification 2.Main Parts and Materials 3.Dimensions
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  • Description

  • Types

    There are five general body styles of ball valves: single body, three-piece body, split body, top entry, and welded. The difference is based on how the pieces of the valve—especially the casing that contains the ball itself—are manufactured and assembled. The valve operation is the same in each case.

    In addition, there are different styles related to the bore of the ball mechanism itself.

    Ball valves in sizes up to 2 inch generally come in single piece, two or three piece designs. One piece ball valves are almost always reduced bore, are relatively inexpensive and generally are throw-away. Two piece ball valves are generally slightly reduced (or standard) bore, they can be either throw-away or repairable.

    The 3 piece design allows for the center part of the valve containing the ball, stem & seats to be easily removed from the pipeline. This facilitates efficient cleaning of deposited sediments, replacement of seats and gland packings, polishing out of small scratches on the ball, all this without removing the pipes from the valve body.

    The design concept of a three piece valve is for it to be repairable.

    Full port

    A full port or more commonly known full bore ball valve has an over-sized ball so that the hole in the ball is the same size as the pipeline resulting in lower friction loss. Flow is unrestricted but the valve is larger and more expensive so this is only used where free flow is required, for example in pipelines which require pigging.

    Reduced port or reduced bore

    In Reduced port (more commonly known as reduced bore) ball valves, flow through the valve is one pipe size smaller than the valve's pipe size resulting in flow area being smaller than pipe.

    V port

    A V port ball valve has either a 'v' shaped ball or a 'v' shaped seat. This allows for linear and even equal percentage flow characteristics. When the valve is in the closed position and opening is commenced the small end of the 'v' is opened first allowing stable flow control during this stage. This type of design requires a generally more robust construction due to higher velocities of the fluids, which might damage a standard valve.

    These can be referred to as a type of control valve but are typically not as accurate as a balancing valve, needle valve, globe valve, or pressure regulating valve.

    Cavity filler

    Many industries encounter problem with residues in the ball valve. Where the fluid is meant for human consumption, residues may also be health hazard, and when where the fluid changes from time to time contamination of one fluid with another may occur. Residues arise because in the half open position of the ball valve a gap is created between the ball bore and the body in which fluid can be trapped.

    To avoid the fluid getting into this cavity, the cavity has to be plugged, which can be done by extending the seats in such a manner that it is always in contact with the ball. This type of ball valve is known as Cavity Filler Ball Valve.

    There are a few types of ball valves related to the attachment and lateral movement of the ball:

    Trunnion

    A trunnion ball valve has additional mechanical anchoring of the ball at the top and the bottom, suitable for larger and higher pressure valves (say, above 10 cm and 40 bars).

    A floating ball valve is one where the ball is not held in place by a trunnion. In normal operation, this will cause the ball to float downstream slightly. This causes the seating mechanism to compress under the ball pressing against it. Furthermore, in some types, in the event of some force causing the seat mechanism to dissipate (such as extreme heat from fire outside the valve), the ball will float all the way to metal body which is designed to seal against the ball providing a somewhat failsafe design.

    Manually operated ball valves can be closed quickly and thus there is a danger of water hammer. Some ball valves are equipped with an actuator that may be pneumatically, hydraulically or motor operated. These valves can be used either for on/off or flow control. A pneumatic flow control valve is also equipped with a positioner which transforms the control signal into actuator position and valve opening accordingly.

    Multiport

    Schematic 3 way ball valve: L-shaped ball right, T-shaped left

    Three- and four-way have an L- or T-shaped hole thr


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