Protecting Pressure Measurement in the Toughest Process Conditions
WIKA diaphragm seals are designed to safeguard pressure instruments from harsh, corrosive, or extreme process media—without compromising measurement accuracy. When paired with WIKA pressure gauges or transmitters, diaphragm seals extend instrument life, improve reliability, and enable pressure measurement where standard instruments would fail.
Valin offers a wide range of WIKA diaphragm seal configurations to meet demanding industrial applications across chemical processing, food & beverage, life sciences, energy, and more.
Why WIKA?
What Are WIKA Diaphragm Seals & Why Use Them?
Diaphragm seals (also called chemical seals) isolate the pressure measuring instrument from the process media using a flexible diaphragm and fill fluid. This design protects the instrument while still transmitting accurate pressure readings.
Diaphragm seals are ideal for applications involving:
- Corrosive or abrasive process media
- High temperatures or extreme pressure spikes
- Viscous, crystallizing, or solidifying fluids
- Sanitary or hygienic requirements
- Processes requiring easy cleaning or media isolation
By preventing direct contact between the process and the pressure instrument, WIKA diaphragm seals help reduce maintenance, minimize downtime, and improve overall process safety.
Features
WIKA diaphragm seals are engineered for long-term stability, precise performance, and application-specific customization.
Key differentiators include:
- Precision-welded diaphragms for superior leak integrity
- Wide material selection, including stainless steel, Hastelloy?, Monel?, tantalum, and PTFE coatings
- Optimized fill fluids matched to temperature and process conditions
- Low volume designs for faster response times and improved accuracy
- Custom-engineered solutions for challenging or unique applications
Each WIKA diaphragm seal is designed to integrate seamlessly with WIKA pressure gauges, transmitters, and switches—ensuring consistent performance from the process connection to the readout.
Applications
Applications & Industries Served
WIKA diaphragm seals are trusted across a wide range of industries where measurement reliability and media isolation are critical.
Typical applications include:
- Chemical and petrochemical processing
- Oil & gas production and refining
- Food, beverage, and dairy processing
- Pharmaceutical and biotechnology manufacturing
- Pulp & paper operations
- Power generation and utilities
Valin’s instrumentation specialists work closely with WIKA to help customers select the right diaphragm seal configuration based on process media, temperature, pressure range, and installation requirements.
Q & A
Diaphragm Seals Q & A
A diaphragm seal is a protective device installed between a pressure instrument and the process. It uses a flexible diaphragm and internal fill fluid to isolate the instrument from the process media. Diaphragm seals are used to protect pressure gauges and transmitters from corrosive, abrasive, high-temperature, or viscous fluids while maintaining accurate pressure measurement.
A WIKA diaphragm seal should be used when the process media could damage or clog a pressure instrument, or when operating conditions exceed the instrument’s limits. Common reasons include corrosive chemicals, extreme temperatures, sanitary requirements, or media that crystallizes or solidifies.
WIKA offers threaded, flanged, in-line, sanitary, and high-temperature diaphragm seals. Each design is engineered for specific installation requirements, pressure ranges, and process conditions. These seals can be paired with gauges, transmitters, or switches as fully assembled systems.
WIKA diaphragm seals are available in a wide range of materials, including stainless steel, Hastelloy?, Monel?, tantalum, and PTFE-coated options. Material selection depends on chemical compatibility, temperature, pressure, and cleanliness requirements of the process.
Diaphragm seals slightly influence system response due to the diaphragm and fill fluid, but WIKA minimizes this effect through optimized diaphragm design and low-volume fill systems. Factory-assembled and calibrated seal systems provide the highest measurement accuracy and long-term stability.
Downloads
Download WIKA Diaphragm Seals – Combinations and Accessories Brochures
Talk to one of our process control experts today at (855) 737-4714 or fill out our online form to learn more.