Diaphragm Valve

Diaphragm valve is used for fluid control or for shutting off pipeline fluids or gasses from coming in contact with the operating parts of the valve, due to the threaded stem which forces a compressor plug against the diaphragm. These are excellent for controlling the flow of fluids containing suspended solids and offer the flexibility of being installed in any position. These types of valves have found widespread use in the pharmaceutical, food processing and water treatment industries.

Types of Diaphragm Valve
These are available in two basic forms:

• Weir type : This is ideal for general use applications or for tough corrosive and abrasive services.
• Straight through type : This can be used in situations where the flow direction changes within the system. They are excellent for use with sludge, slurries and other viscous fluids.

Both styles provide a streamlined path for fluid flow that yields minimal pressure drop across the valve.

There are many advantages provided by diaphragm valves. They are extremely clean, and can form a nearly leak-proof seal for tight shut-off. The diaphragm design provides for easy maintenance and repair as it can be replaced without disturbing the piping line. But, they are limited to moderate temperatures   (-60 to 450°F) and pressure service (approximately 300 psi) by the mechanical properties of most common diaphragm materials. They cannot be used in multi-turn operations.