Diaphragm Valve
Diaphragm Valve Supplier
Diaphragm valves are named for the flexible disc that blocks flow when it makes contact with the seat of the valve. The diaphragm is a pressure responsive component that is highly flexible and produces sufficient force to open, close, or control the function of the valve.M B Enterprise is a leading Diaphragm Valve Supplier in Kolkata.
Introduction
- This article takes an in-depth look at Diaphragm Valve.
- Read further and learn more about topics such as:
- What are diaphragm valves
- Components of diaphragm valves
- Types of diaphragm valves
- Materials of construction of diaphragm valves
- Considerations in diaphragm valve selection and operation
- Advantages and disadvantages of diaphragm valves
What are Diaphragm Valves?
A Diaphragm Valve, or membrane valve, is a valve with an elastomeric diaphragm and a seat upon which the diaphragm rests when it is closed. The flexible diaphragm obstructs, controls, or isolates the flow of fluids and acts as a flow control device.
In a Diaphragm Valve, the diaphragm element flexes up or down to increase or decrease the fluid flow rate. The valve is sealed when the diaphragm is pressed firmly against its solid seat. Diaphragm valves are linear motion valves that monitor and control linear movement of fluids.
Diaphragm Valves are named for the flexible disc that blocks flow when it makes contact with the seat of the valve. The diaphragm is a pressure responsive component that is highly flexible and produces sufficient force to open, close, or control the function of the valve. Diaphragm valves are like pinch valves that use a liner as part of the valve body instead of a diaphragm.
Diaphragm valves can handle liquids, gaseous fluids, and semi-solid media such as slurries, colloids, sludges, and brackish water well. They are ideal for handling liquids with solid particulate matter.
Compared to other valves, diaphragm valves have a simple construction. Due to the minimal contact between their internal components, the build-up of sediments and biofilms in diaphragm valves is very limited and does not interfere with their performance. It is for this reason that they are widely used in food and pharmaceutical manufacturing, water treatment, sewage pipelines and treatment plants, electronics manufacturing, and pulp and paper production.
Diaphragm valves have several different types of connections due to the different kinds of piping systems and are chosen in accordance with the existing system and the necessary seal. Connections that are available include welding of end sockets known as butt welding, flanged, screwed, threaded, clamped, grooved, and solvent cemented.
Threaded
Threaded valve ends have internal or external threads and are screwed in or over the valve end. It is the most common form of connection and is the most secure type of seal.
Compression Fitting
Compression fittings seal tightly without the use of threads or soldering. The seal is formed by tightening a screw that compresses a washer against the connecting pipe.
Bolt Flange
A bolt flange connection is similar to a compression fitting. They create compressive force on a flange using tension across their length. Stud bolts or machine bolts can be used for bolt flange connections.
Clamp Flange
Clamp flanges wrap around a pipe using a spring hinged flange to make the connection.
Tube Fitting
Tube fittings are a direct straight connection between the valve and the pipe.
Butt Weld
There are several varieties of butt welds with each one designed to serve a particular purpose. The main types of butt welds are single and double sided with partial or full penetration. The valve and pipe are joined together without overlapping.
Socket Weld
With a socket weld, the pipe is inserted into a recessed area of the valve and fillet welded. Socket welds are leak proof and are used on high pressure pipelines. Prior to welding, the pipe ends should be cleaned of debris to ensure a tight secure weld.
Metal Face Seal
Metal face seals, also known as duo cone seals, have two metal rings and two large O rings. An O ring and metal ring are installed in the valve housing while the other set of O ring and metal ring are brought together to create an axial load between the metal seal rings. The dynamic movement is between the metal rings to form the seal. The O rings form a face seal on each side of the fitting.