Diaphragm valves (or membrane valves) consists of a valve body with two or more ports, a diaphragm, and a "weir or saddle" or seat upon which the diaphragm closes the valve. The valve is constructed from either plastic or metal.
Diaphragm valves get their name from a flexible disc which comes into contact with a seat at the top of the valve body to form a seal.
A diaphragm is a flexible, pressure responsive element that transmits force to open, close or control a valve.
Diaphragm valves are related to pinch valves, but use an elastomeric diaphragm, instead of an elastomeric liner in the valve body, to separate the flow stream from the closure element.
Diaphragm valves can be manual or automated.
Their application is generally as shut-off valves in process systems within the industrial, food and beverage, pharmaceutical and biotech industries.
The older generation of these valves is not suited for regulating and controlling process flows, however newer developments in this area have successfully tackled this problem.
Advantages of diaphragm valves include:
- Extremely clean
- Leak-proof seal
- Tight shut-off
- Easy maintenance
- Repairs can be made without interrupting pipeline
Diaphragm valves can be controlled by various types of actuators e.g. manual, pneumatic, hydraulic, electric etc.
The most common diaphragm valves use pneumatic actuators; in this type of valve, air pressure is applied through a pilot valve into the actuator which in turn raises the diaphragm and opens the valve. This type of valve is one of the more common valves used in operations where valve speed is a necessity.
At Steam and Valve Specialists we offer high-quality diaphragm valves for various applications. Call our team today for the diaphragm you need at affordable prices.