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.
Ashcroft® Diaphragm Seal Selection
When selecting an Ashcroft® diaphragm seal,
consider the following:
- Threaded – the diaphragm seal 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.
- Capsule – threaded-in capsule design enables
the diaphragm to be removed and/or replaced.
- Welded– the diaphragm is welded directly to the
- 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
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 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.
The diaphragm is in direct contact with the
process, and selecting the proper Ashcroft® diaphragm is important.
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.
To start, please
select a basic type of Ashcroft® diaphragm seal
or contact us for help: