Alle Artikel von bundorvalve

Actuated Butterfly Valve Package For An Underground Drainage System

Our client requested that one of our engineers visit the site and look at a drainage system they were hoping to install.

The client required an automated valve system to be installed underground, which would operate by means of a push button controlled from a location above ground.

Our customer also needed the valve package to be easy to install to drainage pipes.

The client was installing the valves in man-holes. Due to this, a risk arose, as potential rainfall could fill the valve chamber and damage the assembly. As a result of this, we advised our customer to install soakaways to prevent this from happening. Our solution for this project contained the right valve package and was within the clients budget. We also provided all installation and commissioning instructions.

We supplied three J2 H300 actuators mounted directly onto 300mm and 150mm wafer pattern butterfly valves with EPDM liners and stainless steel discs. The customer also requested fabricated flanged spigots, which led to a fast and simple installation.

The actuators are weatherproof to IP65 and fitted with anti-condensation heaters to prevent corrosion of the electronic components and motor. Wiring is simply through DIN connectors at the front of the actuator, eliminating any need to remove the actuator cover.

BALL VALVES, TYPES & ITS USES

Ball valves are given their name by the nature in which they operate, where an internal ball with a bored through center is rotated to either allow or prevent flow through the valve. Ball Valves are part of the quarter-turn valve family, which means they open or close with a 90 degree turn of the handle. Intended for open and close use only, throttling or controlling the flow of media with a ball valve is not recommended and will damage the ball valve itself.

Ball Valve

Types of Ball Valves

There are five general body styles of ball valves: single bodythree-piece bodysplit bodytop 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.

Full port

Ball Valve

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

Reduced port or reduced bore

Ball Valve

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

Ball Valve

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.

Cavity filler

Ball Valve

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.

Trunnion

Ball Valve

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.

Multiport

Ball Valve

Three- and four-way have an L- or T-shaped hole through the middle. The different combinations of flow are shown in the figure. It is easy to see that a T valve can connect any pair of ports, or all three, together, but the 45 degree position which might disconnect all three leaves no margin for error. The L valve can connect the center port to either side port, or disconnect all three, but it cannot connect the side ports together.

Multi-port ball valves with 4 ways, or more, are also commercially available, the inlet way often being orthogonal to the plane of the outlets. For special applications, such as driving air-powered motors from forward to reverse, the operation is performed by rotating a single lever four-way valve. The 4-way ball valve has two L-shaped ports in the ball that do not interconnect, sometimes referred to as an “×” port.

Materials of construction

Body materials may include, but are not limited to, any of these materials:

  • Stainless steel
  • Brass
  • Bronze
  • Chrome
  • Titanium
  • PVC
  • CPVC
  • PFA-lined
  • And many more

Function of Bundor butterfly valve

​As a widely used valve, the function of the butterfly valve is mainly to cut off or regulate the flow of media in the production line. Butterfly valves are widely used in production lines in general industries such as water conservancy projects, water treatment, petroleum, chemical engineering, and urban heating. They can also be used in condensers and cooling water systems of thermal power stations.

The butterfly valve can be divided into a midline butterfly valve and an eccentric butterfly valve according to the structural form. The seal of the middle line butterfly valve is usually made of elastic sealing materials such as rubber and fluorine plastics; the seal of the eccentric butterfly valve usually uses metal to metal, metal-to-fluoroplastic and multi-layer composite plates. The elastic sealed butterfly valve is also called soft sealing butterfly valve. Besides its sealing ring, it can be embedded in the channel of the valve body and can be set around the butterfly plate. When a soft seal butterfly valve is used as a shut-off valve, its sealing performance can reach Class VI of FCI70-2:2006 (ASME B16 · 104), which is much higher than that of a metal-sealed butterfly valve. However, due to the limited temperature of the elastic seal material, the soft seal butterfly valve is more often used in normal temperature water and water treatment fields. The metal hard seal butterfly valve can adapt to higher working temperature, and its service life is longer than that of the soft seal butterfly valve. However, the metal seal butterfly valve is difficult to completely seal, and the sealing performance is very poor, so it is generally used for adjusting the flow rate.

The function of the butterfly valve is also manifested in its wide application in the field of large-diameter adjustment, because when the butterfly valve is fully open, the flow resistance is small. When the butterfly plate opening angle is between about 15-70, the butterfly valve can be very sensitive. Control media flow. In addition, since the butterfly plate of the butterfly valve has the wiping property when it performs a rotary motion, the butterfly valve is used in the pipeline with suspended particulate media, and can also be used for powdery and granular media according to the strength of the seal in the pipeline.

Advantages and Disadvantages of a Butterfly Valve

Advantages of a Butterfly Valve

Butterfly valves are similar to ball valves but have several advantages. They are small and,
when actuated pneumatically, open and close very quickly. The disc is lighter than a ball, and
the valve requires less structural support than a ball valve of comparable diameter. Butterfly
valves are very precise, which makes them advantageous in industrial applications. They are
quite reliable and require very little maintenance.

Disadvantages of a Butterfly Valve

One disadvantage of butterfly valves is that some portion of the disc is always presented to
the flow, even when fully opened. The use of a butterfly valve therefore always results in a
pressure switch across the valve, regardless of the setting.

Butterfly valves can be configured to operate manually, electronically or pneumatically.
Pneumatic valves operate most rapidly. Electronic valves require a signal to the gearbox to
open or close, while pneumatic valves can be either single or double actuated. A single-
actuated valve is typically set up to require a signal to open with a failsafe, meaning that
when power is lost the valve springs back to a fully closed position. Double-actuated
pneumatic valves are not spring loaded and require a signal both to open and to close.

Automated pneumatic butterfly valves are both reliable and durable. Reduced wear improves the
valve life cycle, which reduces operating costs otherwise lost in working hours to maintain
the valves.

Bundor butterfly valve introduction

Manual butterfly valve, manual representation of the butterfly valve drive, manual drive can be divided into two kinds of handle and turbine. One of the two operations is to open and close the butterfly valve by pulling the handle, and the other is to turn the handwheel on the turbine head to control the butterfly valve. Although the manual butterfly valve has two different driving methods, the switching directions of the two manual butterfly valves are the same, and the clockwise operation is defined as the closing direction, and the counterclockwise operation is the opening direction.
Understand the switching direction of the manual butterfly valve. What is the operation method of the manual butterfly valve? For the manual butterfly valve operation method, the handle butterfly valve and the turbine butterfly valve need to be separated.
The handle butterfly valve is used to open and close the valve through a human pull handle. In the middle of the handle and the valve body, there is a gear plate. When the butterfly valve is required to cut off, only the butterfly valve handle needs to be turned to rotate counterclockwise or clockwise. The butterfly valve can be switched, and the angle is selected between 0-90°. When the handle is turned counterclockwise to 90° with the valve body passage, the butterfly valve is fully opened, and when the handle is turned clockwise to 0° with the valve body passage, it is closed. When the angle is between 0° and 90°, flow adjustment can be used.
The switch of the turbine butterfly valve also needs manual operation, but unlike the handle butterfly valve, the opening and closing of the turbine butterfly valve is achieved by turning the hand wheel. Rotate the hand wheel on the turbine head, turn it counterclockwise, turn it clockwise, turn the handwheel, and drive the valve stem through the gear in the turbine device. The valve stem drives the butterfly plate to rotate to achieve the opening and closing effect.

All our Butterfly Valve products are available with Hand wheel, gearbox or actuation to your specification offered in size ranges from DN50 to DN600 for wafer type and up to DN1400 on the double flanged versions.

Handle butterfly valve switch steps

Handle butterfly valve switch steps
The switch of the handle butterfly valve needs to be achieved manually by pulling the handle,
because the butterfly valve can be used to cut off and can also be used to regulate the flow.
A gear is directly between the handle and the valve body. When the handle is pulled to both
sides, the butterfly valve is In the fully open or fully closed state, the butterfly valve is
used to cut off. When the handle is pulled to stop at a certain position above the gear, the
butterfly valve is used to regulate the flow.
The switch position of the handle is parallel to the butterfly plate. A valve rod connects the
two in the middle, and the handle of the handle butterfly valve is pulled. The handle drives
the valve stem to move, and the valve stem will drive the butterfly plate to rotate to achieve
the opening and closing of the butterfly valve. The rotation angle is between 0-90°.

Switch use steps of worm gear operated butterfly valve
The switch of the worm gear operated butterfly valve also needs to be realized manually.
Unlike the handle butterfly valve, the worm gear operated butterfly valve is operated by the
worm wheel. The same as the handle butterfly valve, the butterfly plate and the worm head of
the worm gear operated butterfly valve are directly connected by the valve stem. The use
procedure of the worm gear operated butterfly valve is to turn the hand wheel on the worm
head, turn it counterclockwise, turn it clockwise, turn the hand wheel, drive the valve stem
through the gear in the turbine device, and the valve stem drives the butterfly plate to
rotate. , to achieve the effect of opening and closing.

The most common type of valve used in fluid control – gate valves

The most common type of valve used in fluid control valves in the world is the gate valve – the opening and closing valve in the fluid control process. This type of valve can be found in every refinery, chemical plant, power station, and industrial enterprise manufacturing facility and can be manufactured in sizes ranging from 1/4 inch to 144 inch. The main purpose of the gate valve is to cut off the flow. It is for this reason that gate valves are often referred to as “cutoff” valves or “blocking” valves.

The advantage of using gate valve is that it can provide almost unobstructed media flow in the open position.Among the many common types of valves, only full-opening ball valves can equip with gate valves. Symmetrical design structures and peer-to-peer seals allow the gate valve to intercept the flow of media from either direction. Gate valves can also be made from a variety of materials, small 1/2-inch bright brass taps can be found on the hardware store shelves, and rare high-alloy gate valves can be found in nuclear power station installations.

Due to the potential risk of damage to the seat sealing surface, it is not possible to operate the gate valve in a partially open position or to use the gate valve for regulating purposes.Why this kind of damage occurs because when the gate valve is partially opened, the closing element (gate or wedge) of the gate valve swings between the two valve seats, and scratches may occur, which will affect the sealability of the valve seat.

​In appearance, most of the gate valves look very similar. However, the interior of the valve has a variety of different design structures. Most gate valves consist of a valve body and a valve cover, which contain a shut-off element shutter or wedge. The closing element is connected to the valve stem and passes through the valve cover, finally connecting with the hand wheel or other valve stem operating device. The stuffing material inside the stuffing box withstands the pressure around the valve stem.