Ashcroft Diaphragm Seals
The comprehensive line of Ashcroft diaphragm seals will meet a wide variety of application or installation requirements. Over 30,000 variations are possible with the types, connections and materials available.
Model Index for Diaphragm Seals
Quick Selection: Flanged, Threaded, In-line, Isolation Rings
Capsule Seal
Type 100, 101, 102, 103
104, 105,106,107,108
Top Welded or Bonded
Type 200, 201, 202, 203
204, 205, 206, 207, 208
Clamped Seals
Type 300, 301, 302, 303
All Welded Seals
Type 310, 311, 312, 315, 320
330 400, 401, 500, 511
High Displacement Seals
Type 702,703,740, 741
Isolation Rings
Type 80, 81
Quick Connect
Type 320-Compatible with Tri-Clover® and Cherry Burrell® S line
Ashcroft Diaphragm Seal Selection
When selecting an Ashcroft diaphragm seal, consider the following:
Seal Mounting
Threaded - connects directly to the process by means of a female NPT thread.
Flanged - the diaphragm seal is attached to the process by means of a flange as specified in ASME B16.5
In-line Welded - various types of welded-in diaphragm seals for flow-thru applications.
Diaphragm Types
Capsule - threaded-in capsule design enables the diaphragm to be removed and/or replaced.
Welded- the diaphragm is welded directly to the top housing.
Bonded - Teflon® or Viton® diaphragm bonded directly to the top housing.
Clamped - metal, Viton®, Teflon®, or Kalrez® diaphragm materials are clamped between the top and bottom housing.
Top Housing
Ashcroft diaphragm seals (with the exception of Types 310, 320, 400 & 500 series) are normally furnished with a nickel/chrome plated carbon steel top housing.
As an option, Ashcroft offers 316 stainless steel.
Types 310, 320, 400 & 500 series come standard with a 316L stainless steel top housing. A standard fill/bleed connection allows the seal and instrument to be evacuated and filled.
Lower Housing
Lower housings are available from Ashcroft in a variety of materials to fit your application needs.
Selection of the lower housing material is important since it is in direct contact with the process media.
Diaphragm Materials
The diaphragm is in direct contact with the process, and selecting the proper Ashcroft diaphragm is important.
Clamping Rings
Black epoxy painted carbon steel is standard for Ashcroft rings. 316 stainless steel is an available option.
Upper Flange Rings
ASME B16.5 nickel/chrome plated carbon steel flanged rings are standard. 316 stainless steel is optional.