Diaphragm Seals - All-welded Seals
DF Flush Flanged Diaphragm Seal
The Ashcroft® DF flush flanged diaphragm seal uses a flush diaphragm welded directly to the assembly flange, eliminating the need for a bulky lower housing.
Diaphragm Material |
Bottom Housing Material |
Pressure Rating |
Variety of metallic wetted materials |
Flush design eliminates need for a bottom housing |
150 to 2500 - class flanges |
310-315 Mini-Diaphragm Seals
The Ashcroft® 310 and 315 mini-diaphragm seals or isolation devices protect pressure measuring instruments.
Diaphragm Material |
Bottom Housing Material |
Pressure Rating |
316L Stainless Steel, Monel 400, Hastelloy B, Hastelloy C 276 |
316L Stainless Steel, Monel 400, Hastelloy B, Hastelloy C 276 |
2,500 psi |
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.
Diaphragm Material |
Bottom Housing Material |
Pressure Rating |
316L Stainless Steel, Hastelloy C 276, Tantalum |
316L Stainless Steel, Hastelly C 276 |
1,000 psi |
330 All-Welded Flush Mini Diaphragm Seals
The Ashcroft® 330 all-welded flush mini-diaphragm seal or isolation device protect pressure measuring instruments
Diaphragm Material |
Bottom Housing Material |
Pressure Rating |
316L Stainless Steel |
316L Stainless Steel |
3,000 psi |
400-401 All-Welded Diaphragm Seals
The Ashcroft® 400 and 401 all-welded diaphragm seals or isolation devices protect pressure measuring instruments.
Diaphragm Material |
Bottom Housing Material |
Pressure Rating |
Variety of metallic wetted materials |
Variety of metallic materials |
4,400 psi, 400: 9,000 psi, 401:5,000 psi |
402-403 Flanged All-Weld Diaphragm Seals
The Ashcroft® 402 and 403 flanged all-weld diaphragm seals or isolation devices protect pressure measuring instruments.
Diaphragm Material |
Bottom Housing Material |
Pressure Rating |
Variety of metallic wetted materials |
Variety of metallic materials |
150, 300, 600, 900 or 1500 |
500-501 All-Welded Diaphragm Seals
The Ashcroft® 500 and 501 all-welded diaphragm seals or isolation devices protect pressure measuring instruments.
Diaphragm Material |
Bottom Housing Material |
Pressure Rating |
Variety of metallic wetted materials |
Variety of metallic materials |
500 psi |
510-511 All-Welded Diaphragm Seals
The Ashcroft® 510 and 511 compact, all-welded diaphragm seals or isolation devices protect pressure measuring instruments.
Diaphragm Material |
Bottom Housing Material |
Pressure Rating |
316L Stainless Steel, Hastelloy C 276, Monel 400 |
316L Stainless Steel, Hastelloy C 276, Monel 400 |
510: 5,000 psi, 511: 1,500 psi |
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.
Diaphragm Material |
Bottom Housing Material |
Pressure Rating |
Variety of metallic wetted materials |
Variety of metallic materials |
750 psi |