Ball Valve – How To Order

Ball Valves are the tipical industrial valves,they are widely used in various areas such as pulp and paper, petroleum, chemical, water plant, coal-fire, power plant and water treatment etc. because of its low fluid resistance, reliable sealing performance, rapid open and close, and compact structure.

  • It is composed of valve body,valve ball, valve seat, sealing rings, stems and other related components which is mainly used to cut off or distribute the medium in the pipeline.
  • In special condistions, ball valves are also used as a control valve equipped with actuator and accessories to adjust the flow rate, pressure and temperature of medium in the pipe,this application is less common due to the relatively limited accuracy of controlling the flow rate in comparison with other types of control valves.
Connection End
Threaded

This connection end is an easy way to connect small valves to pipes, It is typically used in applications that have small valves with a diameter less than 4″ because larger diameters will be difficult to seal and are prone to leakages through the threads.

  • They are cheap, easy to install, and easy to maintain and replace.
  • Generally the valve has female threaded ends (both ends) that connect to a male threaded component.
  • In some cases, valve can be made with one male threaded end and the other a female threaded end.
  • The threads are made by adhering strictly to thread standards BSP and NPT.

Examples of threaded ball valve can be listed as below for reference

Manual Threaded Ball Valve

Pneumatic Threaded Ball Valve

Electric Threaded Ball Valve

Flanged

The valve is made with flanges itself, bolts are used to connect the flanges at both ends of the valve to the pipe flange,when choosing a flanged ball valve, we have to consider the pressure rating and flange compression class which indicates the highest pressure this connection type can withstand.

  • Flanges are usually designed in accordance with a certain standard.
  • Valves provide a high flow rate because of its full-bore ball design.
  • They are typically made out of stainless steel, steel, or cast iron.
  • It has an ISO-top and can be made with various structure.
  • Suit for different applications such as high pressure and high temperature
  • Also, the valve can be used for low temperature,flammable, explosive, toxic and corrosive media.

Manual Flanged Ball Valve

Pneumatic Flanged Ball Valve

Electric Flanged Ball Valve

Wafer

Valve with wafer end is one kind of super thin ball valves , this valve is made by one piece body with very narrow face to face dimension which is an ideal valve as a control valve, modulating, and many other applications that specially require tight spacing and low profile valves.

The valve body is tapped allowing use of cap screws to install valve between DIN or ANSI flanges, the end connection size accords with Europe standard EN1092 DIN or ASME B16.34, Body Wall Thickness accords with ASME B16

Wafer Ball Valve Comapct Body Ball Valve (13)

Manual Wafer Ball Valve

Wafer Ball Valve Comapct Body Ball Valve (8)

Electric Wafer Ball Valve

Pneumatic Wafer Ball Valve

Valve Housing

The assembly of the valve housing can be divided in three commonly used designs: one-piece, two-piece and three-piece housings. The difference is how the valve is assembled and this affects the possibilities for maintenance or repair. The operation of the valves is the same in each embodiment.

  • One-piece:This is the cheapest variant. The two parts which enclose the ball are pressed or welded. The valves can not be opened for cleaning or maintenance. This type is generally used for low-demanding applications.
  • Two-piece: Two-piece valves can be disassembled for cleaning, servicing and inspection. Often, the parts are connected via a threaded connection. The valve must be completely removed from the pipe in order to separate the two parts.
  • Three-piece: More expensive valves have often three pieces. The parts are generally clamped together by bolt connections. The advantage of this embodiment is that the valve can be serviced without removing the entire valve from the pipeline.

One-piece Ball Valve

Two-piece Ball Valve

Three-piece Ball Valve

Ball design

The most common design is the “floating ball design”. The ball is suspended in the media and held in place by two sealing rings. Some high-quality valves have a trunnion ball design. The ball is supported at the top and bottom to reduce the load on the valve seats.

  • Floating: The majority of ball valves have a floating ball. The ball is supported by the valve seats.
  • Trunnion: Valves with large diameters and high operating pressures (for example DN >100mm and 30 bar) have often a trunnion design. The ball is supported on the bottom and top to reduce the load on the seat rings. The operating torque is generally lower for trunnion valves.

The hole through the ball may have different profiles such as a full bore, reduced bore or V-shaped.

  • Reduced bore: Most ball valves have a reduced bore. As a result, the valve introduces friction losses in the system. These losses are still relatively small compared to other types of valves. One-piece ball valves are almost always reduced bore.
  • Full bore: Full bore valves have the same bore diameter as the pipe. The advantage is that there are no extra friction losses, and that the system is mechanically easier to clean (pigging). The downside is that the ball and the housing are bigger than a standard reduced bore quarter-turn valve. The cost is therefore slightly higher, and for many applications this is not required. They are also called full port ball valves.
  • V Notch: The hole in the ball or the valve seat has a “V” shaped profile. As a result, the desired flow rate can be controlled more precisely by rotating the ball. By optimizing the profile, a linear flow characteristic can be approached.

Floating Ball Valve

Trunnion Ball Valve

V Notch Ball Valve

Circuit Function

The valve may have two, three or even four ports (2-way, 3-way or 4-way). The vast majority of ball valves are 2-way and manually operated with a lever. The lever is in line with pipe when the valve is opened. In closed position, the handle is perpendicular to the pipe. The ball valve flow direction is simply from the input to the output for a 2-way valve. Manually operated ball valves can be quickly closed and therefore there is a risk of water hammer with fast-flowing media. Some ball valves are fitted with a transmission. The 3-way valves have an L-shaped or T-shaped bore, which affect the circuit function (flow direction).

As a result, various circuit functions can be achieved such as distributing or mixing flows.

2-way Ball Valve

3-way Ball Valve

4-Way Ball Valve

How to choose a right valve quickly
Step 1: Service Condition
Step 2: Valve Selection
Step 3: Actuator Selection
Manual Operation *
Step 4: Accessories Selection
Step 5: Leave your contact information