The pneumatic piston diaphragm regulating valve imported from Germany Lake consists of two parts: a diaphragm valve and a pneumatic actuator. It uses compressed air as power to regulate the flow of fluid media in process pipelines. Since the structure adopts a valve body with a corrosion-resistant lining and a corrosion-resistant diaphragm, no stuffing box structure, the throttling element is an elastic diaphragm, and the valve body flow path is smooth, the pneumatic membrane diaphragm valve has small negative force. Beijing Satellite TV Installation It has the advantages of large flow, no leakage, convenience, reliability, and fire and explosion protection. It is widely used in industrial automation systems for media with strong acid, strong alkali, strong corrosion, high viscosity, grains, fibers, and toxic and non-contaminating media. Flow regulation.
The closing and opening of the diaphragm valve is achieved by the pressure from the pipeline acting on the reinforced rubber diaphragm. When the pressure medium enters the valve control chamber, the diaphragm presses down and closes the valve channel. When the control chamber pressure is discharged to the atmosphere or downstream pipes, the diaphragm rises and the valve channel is opened. The valve does not have a valve stem, sealing gasket, directional seat, etc. The only moving part in the channel is the diaphragm, so there is no corrosion or locking phenomenon, and it has higher stability. A variety of structural forms and control forms can be applied to a variety of fluid control needs.
◇Use of pneumatic diaphragm valve
Pneumatic diaphragm valve is specially used to control non-corrosive or generally corrosive media. The surface of the valve body cavity is unlined or covered with various rubbers to choose from. It is suitable for different working temperatures. and fluid pipeline applicable temperatures ℃, ℃, ℃, ℃ (according to lining and diaphragm materials) { ( [Pressure level
◇Main materials of pneumatic diaphragm valve
Valve body cast iron, carbon steel, stainless steel, { ( [ Valve cover cast iron, carbon steel, stainless steel, { ( [ Lining without lining, rubber, fluorine lining { ( [ Diaphragm rubber, { ( [ Valve cast iron, carbon steel { ( [ Cylinder aluminum all gold { ( [ Piston carbon steel, Stainless steel { ( [ Valve stem carbon steel, stainless steel { ( [ Handwheel cast iron, stainless steel
◇ Selection of accessories for pneumatic diaphragm valves
The feedback device is also called a limit switch, which provides remote feedback of switch signals (explosion-proof)
The solenoid valve has two-position five-way for double-acting and two-position three-way for single-acting (explosion-proof)/
The triple piece can stabilize the air source, filter, and add lubricating oil to the cylinder
The hand wheel mechanism can realize manual opening and closing of the valve
The electric positioner inputs
~
signals,
realizes the valve adjustment function
Remarks
Please refer to the cylinder parameters Also refer to the selected pneumatic actuator information
◇Main technical parameters of pneumatic diaphragm valve
Material
Cast iron
Brand
Model
Product alias
Diaphragm valve
Scope of application< br/>
Environmental protection industry
Connection form
Flange, double union, clamp quick installation type
Nominal diameter
~ ( )
Pressure
), ), ( )
Action mode
Normally open Type, normally closed, reciprocating
Valve body material
Cast iron, cast steel, stainless steel
Optional accessories
Solenoid valve, valve position feedback limit switch, positioner, air Filter pressure reducing valve
Lining material
Rubber lining, fluorine lining
Cylinder material
Aluminum alloy
Diaphragm quality
Rubber lining, fluorine lining
◇Characteristics of pneumatic diaphragm valve
The biggest difference between the diaphragm valve and other valves is that the rubber diaphragm without stuffing box can completely isolate the corrosive medium in the flow channel from all driving components. , thereby eliminating the shortcomings of common valves such as running, popping, dripping, and leaking.
Because the flow path of the diaphragm valve is smooth and the flow resistance is small, a larger flow rate can be obtained.
There are a variety of rubbers available for the inner cavity surface of the rubber diaphragm valve. Therefore, it has excellent corrosion resistance characteristics.
The seal is an elastic rubber diaphragm. It also has better sealing and minimal closing force.
The valve is composed of valve body, valve cover, valve disc, valve stem, diaphragm and other driving parts.
The opening and closing of the door is achieved by rotating the hand wheel. The diaphragm valve is marked with a color display on the upper end of the valve cover that allows you to see the open or closed position of the valve to indicate the opening and closing stroke of the valve. When the handwheel is placed clockwise, the handwheel will move downward, and the valve disc will drive the diaphragm down to cut off the passage. On the contrary, the valve will open and the color will be revealed.
◇Outline dimensions of pneumatic diaphragm valve
◇Dimensional data of pneumatic rubber-lined diaphragm valve
Named diameter
(height)
Overall dimensions
(flange outer diameter)
(flange screw hole diameter)
(valve body length)
(Number of flange screw holes)
(Screw hole size)
(Flange thickness)
Imported pneumatic diaphragm valve, German Lake brand