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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.