Data Sheet

The Ashcroft® DF flush flanged diaphragm seal uses a diaphragm welded directly to the assembly flange, eliminating much of the cost associated with bulky lower housings made from exotic and expensive wetted materials. The flush-mounted diaphragm prevents clogging and is available in a full range of metallic and coated materials. 

Key Features:

• Flush design minimizes the use of expensive specialty wetted materials
• Flush-mounted diaphragm prevents clogging of process media

Specifications:

• Style: DF (flush)
• Process size: 1" to 4" flanged
• Flange Rating: 150RF to 2500RF

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Data Sheet

310-315 Minni-Diaphragm Seals

The Ashcroft® 310 and 315 mini-diaphragm seals or isolation devices protect pressure measuring instruments. Used to ensure process compatibility, they are also applied when process media exhibits high temperature, pulsation, and the potential for plugging or freeze-up. An ideal choice for limited space installations.

Key Features:

• Compact and lightweight design
• All-welded construction
• Choice diaphragm and lower housing materials
• Pressure rated up to 2,500 psi at 100°F
• Volumetric displacement allows attachment to: 
  3 1/2" gauges (60 to 1,000 psi)
  Transducers and switches
  

Specifications:

• Style:
  Type 310: threaded 
  Type 315: threaded
• Process size:
  Type 310: 1/4" and 1/2" NPT female and male
  Type 315: 1/4" and 1/2" NPT female

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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

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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

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400-401 All-Welded Diaphragm Seals

The Ashcroft® 400 and 401 all-welded diaphragm seals or isolation devices protect pressure measuring instruments. Used to ensure process compatibility, they are also applied when process media exhibits high temperature, pulsation or the potential to clog an instrument connection. An ideal selection for applications needing added product integrity.

Key Features:

• Select diaphragm and lower housing materials
  
• All-welded construction
  
• Carbon steel rings (standard); 300 stainless steel rings (optional)
  
• Pressure rated up to 4,400 psi; optional high-pressure rings to
  9,000 psi (type 401: 5,000 psi ) 
  
• Flush port (type 401) provides easy cleaning / flushing due to process 
  media prone to clogging

Specifications:

• Style:
  Type 400: threaded
  Type 401: threaded with flushing port
  
• Process size:
  Type 400: 1/4" to 1" NPT female;  1/4" to 3/4" NPT male
  Type 401: 1/4" to 1" NPT female
  
• Rated up to 4,400 psi

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402-403 Flanged All-Weld Diaphragm Seals

The Ashcroft® 402 and 403 flanged all-weld diaphragm seals or isolation devices protect pressure measuring instruments. Used to ensure process compatibility, they are also applied when process media exhibits high temperature, pulsation or the potential to clog an instrument connection. An ideal selection for applications needing added product integrity.

Key Features:

• Wide selection of diaphragm and lower housing materials
  
• All welded construction
  
• Flushing port (type 103) provides easy cleaning / flushing due to process media prone to clogging

Specifications:

• Style:
  Type 402: flange
  Type 403: flange with flushing port 
  
• Process size: 1/2" to 3"
  
• Flange rating: 150 to 1500 class

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500-501 All-Welded Diaphragm Seals

The Ashcroft® 500 and 501 all-welded diaphragm seals or isolation devices protect pressure measuring instruments. Used to ensure process compatibility, they are also applied when process media exhibits high temperature, pulsation or the potential to clog an instrument connection. An ideal selection for applications needing added product integrity.

Key Features:

• Recommended where clamped joints are not acceptable
  
• All-welded construction; prevents inadvertent disassembly
  
• All-stainless steel construction; other materials available
  
• Flush port (type 501) provides easy cleaning / flushing due to process 
  media prone to clogging

Specifications:

• Style:
  Type 500: threaded
  Type 501: threaded with flushing port
  
• Process size:
  Type 500: 1/4" to 1" NPT female; 1/4" to 3/4" NPT male
  Type 501: 1/4" to 1" NPT female
  
• Rated up to 500 psi

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510-511 All-Welded Diaphragm Seals

The Ashcroft® 510 and 511 compact, all-welded diaphragm seals or isolation devices protect pressure measuring instruments. Used to ensure process compatibility, they are also applied when process media exhibits high temperature, pulsation or the potential to clog an instrument connection. An ideal selection for applications when space and safety are stressed.

Key Features:

• All-welded, compact size and lightweight
• Continuous duty
• All-welded construction; prevents inadvertent disassembly
• All-stainless steel construction; other materials available
• Flush port (type 511) provides easy cleaning / flushing due to process media prone to clogging

 Specifications:

• Style:
  Type 510: threaded
  Type 511: threaded with flushing port
  
• Process size: 1/2" NPT male
  
• Rated up to 1,500 psi; optional 5,000 psi with high-pressure rings

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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

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