Diaphragm valves offer many combinations of body materials and elastomeric diaphragm materials. The valve design is abrasion-resistant and non-clogging. When the diaphragm, which is connected to the stem of the valve by a compressor, is pulled away from the bottom of the valve body, the path of the fluid has a smooth, streamlined flow. Slurries at low pressure that would normally clog most other valve designs easily pass through a diaphragm valve. The valve has a top-entry design, allowing in-line maintenance; it is suitable for throttling and on/off service in applications ranging from water treatment to chemical abrasion processes. Diaphragm valves are operated manually, electrically, or pneumatically.
The main advantage of a diaphragm valve is the almost full flow opening and hence very low head loss. Diaphragm valves are good for controlling flow, normally they are used for compressed air, seawater or freshwater and in a great number of other applications. Full flow also means less wear and tear compared to other valves, giving longer lifetime and reduced need for maintenance.