Diaphragm seals, also referred to as chemical seals, are used to isolate pressure gauges, switches, and transmitters from clogging and/or corrosive media. Standard diaphragm seal bodies and diaphragms are made of stainless steel; however, a variety of materials from carbon steel to Hastelloy® C-276 are available to meet the demands of most applications. WIKA diaphragm seals can operate in pressure applications from 10″ H2O to 20,000 psi and media temperature between -130°F and 752°F.
EXAMPLES OF TYPICAL DIAPHRAGM SEAL APPLICATIONS
- The temperature of the media may be too high for a standard gauge, switch or transmitter to operate properly.
- The media is highly viscous or tends to crystallize, or polymerize and may clog the pressure port of a gauge, switch or transmitter.
- The media is non-homogenous or contains suspended matter such as wood pulp which may clog the pressure port of a gauge, switch or transmitter.
- Remote reading is required. A diaphragm seal with a capillary line will allow remote installation of a pressure instrument.
- The sanitary cleanliness level is critical. A flush mounted or INLINE SEAL™ sanitary type diaphragm seal avoids dead space and cavities.
- The media is toxic or hazardous and may pollute the environment. A suitably designed diaphragm seal will provide additional protection.
- The application requires high overpressure protection. A diaphragm seal with a contoured diaphragm bed can be configured to provide overpressure protection and protection to the instrument.
WIKA diaphragm seal systems are an excellent value and offer savings by:
- Meeting fugitive emission requirements
- Extending the service life of the pressure instrument
- Reducing the cost of installation
- Reducing or eliminating maintenance costs