Ball Valves & Multiport Ball Valves
Petro-Valve has an extensive stock of ball and multiport ball valves. We are an authorized distributor for the most reputable brands in the industry including Worcester, Quadrant, Nibco, Crane, PBV and McCanna.
Ball valves are durable and are an excellent choice for shutoff applications, and therefore may be often preferred to globe valves and gate valves for this purpose. Ball valves are used extensively in industry because they are very versatile, supporting pressures up to 700 bard and temperatures up to 200° C. The size of ball valves generally ranges from 0.5 cm to 30 cm.
Types of Ball Valves:
- Floating - In floating ball valves, the ball has some freedom to move along the axis of the valve while having no freedom to rotate against the stem. when line pressure is applied to the closed ball, it moves slightly (or floats) downstream to maintain contact with the downstream seat where primary sealing occurs. Because the stem motion from full open to full closed is a 90 degree rotation, ball valves are ideally suited for automatic operation. They may generally be installed without regard for flow direction
- Trunion - A trunion 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).
- Cavity Filler - 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.
Body Styles of Ball Valves:
- Single body
- 3-piece body
- Split body
- Top Entry
- Welded Body
Designs of Ball Valves:
- Straight way
- 3-way multiport
- 4-way multiport
Bores of Ball Valves:
- 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 - In reduced port or more commonly known 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 the orifice to be opened and closed in a more controlled manner with a closer to linear flow characteristic. 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.
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