Diaphragm Seals and Isolators
Find the optimal Ashcroft® diaphragm seals and isolation rings for your application by using the filtering options provided.
Ashcroft® diaphragm seals and isolation rings protect valuable instruments from potential damage caused by corrosive media or clogging from sludge or slurries, especially in wastewater processing. Diaphragm seals are offered in a variety of configurations with a wide selection of compatible wetted materials, such as 316 stainless steel, Monel and Tantalum. Isolation rings are available in different diameters for integration into piping systems. They provide a contiguous, flexible inner wall that deflects to equally pressurize the fill fluid into the pressure measuring device.
Showing 1-12 of 9 products
205 In-Line Saddle Diaphragm Seal
The Ashcroft® 205 in-line saddle diaphragm seals protect pressure measuring instruments. Welded directly onto process piping, it is used to prevent process clogging or accumulation....
106 In-Line Flanged Diaphragm Seal
The Ashcroft® 106 in-line flanged diaphragm seals protect pressure measuring instruments. Mounted in-line with the process piping, it is used in applications where continuous flow...
204 In-Line Threaded Diaphragm Seal
The Ashcroft® 204 in-line diaphragm seals protects pressure measuring instruments. Mounted in-line with the process piping, it is used in applications where continuous flow is...
105 In-Line Saddle Diaphragm Seal
The Ashcroft® 105 in-line saddle diaphragm seals protect pressure measuring instruments. Welded directly onto process piping, it is used to prevent process clogging or accumulation....
206 In-Line Flanged Diaphragm Seal
The Ashcroft® 206 in-line flanged diaphragm seals protect pressure measuring instruments. Mounted in-line with the process piping, it is used in applications where continuous flow...
107 In-Line Socket Weld Diaphragm Seal
The Ashcroft® 107 in-line socket-weld diaphragm seals protect pressure measuring instruments. Mounted in-line with the process piping, it is used in applications where continuous flow...
108 In-Line Butt Weld Diaphragm Seal
The Ashcroft® 108 in-line butt-weld diaphragm seals protect pressure measuring instruments. Mounted in-line with the process piping, it is used in applications where continuous flow...
207 In-Line Socket Weld Diaphragm Seal
The Ashcroft® 207 in-line socket-weld diaphragm seals protect pressure measuring instruments. Mounted in-line with the process piping, it is used in applications where continuous flow...
208 In-Line Butt Weld Diaphragm Seal
The Ashcroft® 208 in-line butt-weld diaphragm seals protect pressure measuring instruments. Mounted in-line with the process piping, it is used in applications where continuous flow...Types of Diaphragm Seals & Isolators
Ashcroft diaphragm seals and isolators help protect pressure gauges, sensors, and switches from challenging process conditions. They are used to improve measurement reliability in applications involving corrosive chemicals, extreme temperatures, sanitary processes, and media that can clog or damage pressure instruments.
- Threaded Diaphragm Seals – For general industrial and process applications requiring instrument isolation and protection from challenging process media.
- Flanged Diaphragm Seals – Used in process systems requiring robust installation and compatibility with larger piping and vessel connections.
- In-Line Diaphragm Seals – Provides unrestricted process flow while isolating pressure instruments from the process media.
- Tri-Clamp Diaphragm Seals – Meets hygienic requirements in food, beverage, pharmaceutical, and biotechnology applications.
- Isolation Rings – Offers instrument protection in applications involving corrosive, abrasive, or difficult-to-measure process media.
All-Welded - Designed to eliminate potential leak paths and provide reliable pressure measurement in critical process applications.
- Chemical Seals – Designed to protect pressure instruments from corrosive chemicals and aggressive process fluids.
- Remote Mount Diaphragm Seals – Designed to separate the instrument from the process connection using a capillary system for high-temperature, vibration, or accessibility requirements.
Industry Applications Where Diaphragm Seals & Isolators are Used
Ashcroft diaphragm seals and isolators are used across a wide range of industries to protect pressure instruments and improve measurement reliability in demanding process conditions.
- Chemical & Petrochemical – Used to isolate pressure instruments from corrosive chemicals, aggressive media, and high-temperature processes.
- Oil & Gas – Used in upstream, midstream, and downstream applications requiring protection from harsh process conditions.
- Power Generation – Used in steam, turbine, and auxiliary systems where temperature and process compatibility are critical.
- Water & Wastewater – Used in treatment, pumping, filtration, and chemical dosing applications.
- Food & Beverage – Used in sanitary processes requiring hygienic pressure measurement and cleanability.
- Pharmaceutical & Biotechnology – Used in cleanroom, sterile, and validated manufacturing environments.
- High Purity & Semiconductor – Used in ultra-clean gas and fluid systems requiring contamination-free pressure measurement.
- Pulp & Paper – Used in slurry, fibrous, and process applications that can clog conventional pressure connections.
- Mining & Metals – Used in abrasive, high-solids, and harsh process environments.
- Hydrogen & Alternative Energy – Used in emerging energy applications requiring reliable pressure measurement and media isolation.
Frequently Asked Questions for Diaphragm Seals
When is a diaphragm seal used?
When do you use a diaphragm seal vs. an isolation ring?
What Ashcroft® instruments are not available with diaphragm seals?
What are the flange rating conversions to PSI ratings?
Can I reuse a diaphragm seal if the instrument goes bad and needs replacing? What do I have to do to do this?
Can a diaphragm seal be used on a switch?
Related Resources
What to Know About Pressure and Temperature Instruments for Phosgene Service (resource)
Why Are Isolation Ring Assemblies Used in Water/Wastewater Applications? (resource)
What Is a Test Gauge and When Do You Need One? (resource)
Why Use a Saddle Seal in Process Applications? (resource)
What Certifications are Available for Diaphragm Seal Assemblies? (resource)
Why Field Filling Your Isolators is not Recommended (resource)
Considerations for using a diaphragm seal in low-pressure applications (resource)
When NOT to Use An Isolation Ring (resource)
Reasons to Use a Diaphragm Seal or Isolation Ring (resource)
What to consider when choosing material for your diaphragm seal (resource)
When would I use a dampening device with a diaphragm seal? (resource)
What is a Diaphragm Seal? (resource)
What factors affect diaphragm seal performance? (resource)
How do I safely select diaphragm seals for high temperature applications? (resource)
When to Use a Diaphragm Seal vs. an Isolation Ring (resource)
Fill Fluid Options for Pressure Instruments (resource)
Heat Dissipation: Pressure Gauge Accessories for Non-Steam Applications (resource)
CRN - 80 & 81 Isolation Rings - Prince Edward Island (resource)
CRN - 80 & 81 Isolation Rings - Saskatchewan (resource)
CRN - 80 & 81 Isolation Rings - Ontario (resource)
CRN - 80 & 81 Isolation Rings - Nunavut (resource)
CRN - 80 & 81 Isolation Rings - Nova Scotia (resource)
CRN - 80 & 81 Isolation Rings - Yukon (resource)
CRN - 80 & 81 Isolation Rings - Northwest Territories (resource)
CRN - 80 & 81 Isolation Rings - New Foundland (resource)
Ready to solve your pressure and temperature challenges?
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