1. Ashcroft 100-101 Threaded Diaphragm Seals
The Ashcroft® 100 and 101 threaded diaphragm seals or isolation devices protect pressure measuring instruments. Used when process compatibility is required, these are also applied when media exhibits high temperature or the potential to clog an instrument connection. Ideal for satisfying many challenging applications.
Key Features:
- Wide selection of diaphragm and lower housing materials
- Diaphragm threaded to top housing
- Flushing port (type 101) provides easy cleaning/flushing due to process media prone to clogging
Specifications:
- Style:
Type 100: threaded
Type 101: threaded with flushing port - Process size:
NPT female: 1/4″ to 1 1/2″
NPT male: 1/4″ to 1″ - Rated up to 2,500 psi, optional 5000psi
The 100 and 101 diaphragm seals are ideal where process protection is essential:
Process Market:
- Oil and Gas
- Refineries
- Chemical and Petrochemical
- Water and Wastewater
Process Applications:
- Oil and Gas Fracking
- NACE Compliant Processes (Sour Gas Separation)
- Biogas and Biodiesel
2. Ashcroft 200-201 Threaded Diaphragm Seals
The Ashcroft® 200 and 201 threaded diaphragm seals or isolation devices protect pressure measuring instruments. Used when process compatibility is required, these are also applied when media exhibits high temperature or the potential to clog an instrument connection. Ideal for satisfying many challenging applications.
Key Features:
- Wide selection of diaphragm and lower housing materials
- Diaphragm welded (metallic) or bonded (elastomer) to top housing
- Flushing port (type 201) provides easy cleaning / flushing due to process media prone to clogging
Specifications:
- Style:
Type 200: threaded
Type 201: threaded with flushing port - Process size:
NPT female: 1/4″ to 1 1/2″
NPT male: 1/4″ to 1″ - Rated up to 2,500 psi, optional 5000psi
The 200 and 201 diaphragm seals are ideal where process protection is essential:
Process Market:
- Oil and Gas
- Refineries
- Chemical and Petrochemical
- Water and Wastewater
Process Applications:
- Oil and Gas Fracking
- NACE Compliant Processes (Sour Gas Separation)
- Biogas and Biodiesel
3. Ashcroft 311-312 Midi-Diaphragm Seals
The Ashcroft® 311 and 312 midi-diaphragm seals or isolation devices are used in confined areas to protect measuring instruments. Used to ensure process compatibility, they are also applied when process media exhibits high temperature and pulsation. This model is ideal with limited space installations.
Key Features:
- Compact and lightweight design
- Choice diaphragm and lower housing materials
- All-welded construction
- Volumetric displacement allows attachment to:
3 1/2″ gauges (Vac to 1,000 psi)
4 1/2″ gauges (30 to 1,000 psi)
Transducers and switches - Rated up to 1,000 psi
Specifications:
- Style:
Type 311: threaded
Type 312: threaded - Process size:
Type 311: 1/4″ to 1/2″ NPT male; 1/4″ to 1″ NPT female
Type 312: 1/4″ and 1/2″ NPT female
The 311 and 312 midi-diaphragm seals are ideal where corrosion protection and limited-spacing are essential.
Process Market:
- Oil and Gas
- Refineries
- Chemical and Petrochemical
- Water and Wastewater
Process Applications:
- Oil and Gas Fracking
- NACE Compliant Processes (Sour Gas Separation)
- Biogas and Biodiesel
4. Ashcroft 330 All-Welded Flush Mini Diaphragm Seals
The Ashcroft® 330 all-welded flush mini-diaphragm seal or isolation device protect pressure measuring instruments. Used to ensure process compatibility, they are also applied when process media exhibits high temperature, pulsation, and a potential for plugging or freeze-up. An ideal choice for limited space applications.
Key Features:
- Compact and lightweight design
- All-welded construction
- Flush diaphragm; eliminates clogging or process accumulation
- Volumetric displacement;
For use with 3 1/2″ pressure gauges or smaller (60 to 3,000 psi) - Pressure rated up to 3,000 psi
Specifications:
- Process size: 1″ NPT male
The 330 all-welded flush mini-diaphragm seals are ideal where corrosion protection and limited-spacing are essential.
Process Market:
- Pulp and Paper
- Chemical and Petrochemical
Medical & Life Sciences Market:
- Pharmaceutical
- Food and Beverage
5. Ashcroft 740-741 High-Displacement Diaphragm Seals
The Ashcroft® 740 and 741 high-displacement diaphragm seals or isolation devices are used with low-ranged instruments or high static pressure dp gauges with low differential pressure. Used to ensure material compatibility, they are also applied when process media exhibits high temperature, pulsation or the potential to clog an instrument connection. An ideal product for satisfying low pressure measurement needs.
Key Features:
- Wide selection of diaphragm and lower housing materials
- Enlarged welded diaphragm; high displacement allows high sensitivity to
pressure fluctuations - Flush port (type 741) provides easy cleaning / flushing due to process
media prone to clogging
Specifications:
- Style:
Type 740: threaded
Type 741: threaded with flushing port - Low pressure range capability; 30″ IWC to 750 psi
- Process size: 1/4″ to 1″ NPT female
- Rated up to 750 psi
The 740 and 741 high-displacement diaphragm seals are ideal where low volume measurement and process protection are essential:
Process Market:
- Oil and Gas
- Refineries
- Chemical and Petrochemical
- Water and Wastewater
Process Applications:
- Oil and Gas Fracking
- NACE Compliant Processes (Sour Gas Separation)
- Biogas and Biodiesel